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69 results on '"Département Imagerie et Simulation pour le Contrôle (DISC)"'

1. Metamodel-based Markov-Chain-Monte-Carlo parameter inversion applied in eddy current flaw characterization

Author: Dominique Lesselier, Marc Lambert, Caifang Cai, Pierre-Emile Lhuillier, Thomas Rodet, Roberto Miorelli, Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Simulation et de Modélisation Électromagnetique (LSME), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Génie électrique et électronique de Paris (GeePs), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), Matériaux et Mécanique des Composants (EDF R&D MMC), EDF R&D (EDF R&D), EDF (EDF)-EDF (EDF), ANR-13-MONU-0011,ByPASS,Méthodes Bayesiennes pour le diagnostic et la Probabilité de détection Assistée par la Simulation(2013), Laboratoire des signaux et systèmes ( L2S ), Université Paris-Sud - Paris 11 ( UP11 ) -CentraleSupélec-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Simulation et de Modélisation Électromagnetique ( LSME ), Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Laboratoire Génie électrique et électronique de Paris ( GeePs ), Centre National de la Recherche Scientifique ( CNRS ) -CentraleSupélec-Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Université Paris-Sud - Paris 11 ( UP11 ), Systèmes et Applications des Technologies de l'Information et de l'Energie ( SATIE ), Centre National de la Recherche Scientifique ( CNRS ) -Conservatoire National des Arts et Métiers [CNAM] ( CNAM ) -Université de Cergy Pontoise ( UCP ), Université Paris-Seine-Université Paris-Seine-École normale supérieure - Rennes ( ENS Rennes ) -Université Paris-Sud - Paris 11 ( UP11 ) -École normale supérieure - Cachan ( ENS Cachan ) -Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux ( IFSTTAR ), EDF - R&D Department MMC and MAI, EDF R&D ( EDF R&D ), EDF ( EDF ) -EDF ( EDF ), ANR-13-MONU-0011,ByPASS,Méthodes Bayesiennes pour le diagnostic et la Probabilité de détection Assistée par la Simulation ( 2013 ), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM), and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: MCMC, Computer science, Bayesian probability, flaw characterization, [ SPI.SIGNAL ] Engineering Sciences [physics]/Signal and Image processing, 01 natural sciences, Bayesian, Standard deviation, law.invention, 010104 statistics & probability, symbols.namesake, law, [MATH.MATH-MP]Mathematics [math]/Mathematical Physics [math-ph], Eddy-current testing, Nondestructive testing, 0103 physical sciences, Eddy current, General Materials Science, 0101 mathematics, 010302 applied physics, metamodel, business.industry, Mechanical Engineering, [ MATH.MATH-MP ] Mathematics [math]/Mathematical Physics [math-ph], Inversion, non-destructive testing, Inversion (meteorology), Markov chain Monte Carlo, Condensed Matter Physics, eddy-current, Metamodeling, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [ SPI.ELEC ] Engineering Sciences [physics]/Electromagnetism, symbols, business, Algorithm, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract: International audience; Flaw characterization in eddy current testing usually requires to solve a nonlinear inverse problem. Due to high computational cost, Markov Chain Monte Carlo (MCMC) methods are hardly employed since often needing many forward evaluations. However, they have good potential in dealing with complicated forward models and they do not reduce to only providing the parameters sought. Here, we introduce a computationally-cheap surrogate forward model into a MCMC algorithm for eddy current flaw characterization. Due to the use of a database trained off-line, we benefit from the MCMC algorithm for getting more information and we do not suffer from the computational burden. Numerous experiments are carried out to validate the approach. The results include not only the estimated parameters, but also standard deviations, marginal densities and correlation coefficients between two parameters of interest.
Published: 2018
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2. Real time groove characterization combining partial least squares and SVR strategies: application to eddy current testing

Author: Shamim Ahmed, Pierre Calmon, Roberto Miorelli, Nicola Anselmi, Christophe Reboud, Giacomo Oliveri, Andrea Massa, Marco Salucci, Laboratoire de Simulation et de Modélisation Électromagnetique (LSME), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), ELEDIA Research Center@DISI, University of Trento, via Sommarive 5, 38123 Trento, Italy (ELEDIA), University of Trento [Trento], DIGITEO, SIRENA Project, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Università degli Studi di Trento (UNITN), Laboratoire de Simulation et de Modélisation Électromagnetique ( LSME ), Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Laboratoire des signaux et systèmes ( L2S ), Université Paris-Sud - Paris 11 ( UP11 ) -CentraleSupélec-Centre National de la Recherche Scientifique ( CNRS ), ELEDIA Research Center@DISI, University of Trento, via Sommarive 5, 38123 Trento, Italy ( ELEDIA ), and DIGITEO
Subjects: History, Engineering, Adaptive sampling, Iterative method, Speech recognition, Feature extraction, 0211 other engineering and technologies, 02 engineering and technology, [ SPI.SIGNAL ] Engineering Sciences [physics]/Signal and Image processing, 01 natural sciences, Education, law.invention, Physics and Astronomy (all), law, Eddy-current testing, 0103 physical sciences, Partial least squares regression, Eddy current, 021101 geological & geomatics engineering, 010302 applied physics, business.industry, Inversion (meteorology), Computer Science Applications, Support vector machine, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [ SPI.ELEC ] Engineering Sciences [physics]/Electromagnetism, business, Algorithm, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract: International audience; A quasi real-time inversion strategy is presented for groove characterization of a conductive non-ferromagnetic tube structure by exploiting eddy current testing (ECT) signal. Inversion problem has been formulated by non-iterative Learning-by-Examples (LBE) strategy. Within the framework of LBE, an efficient training strategy has been adopted with the combination of feature extraction and a customized version of output space filling (OSF) adaptive sampling in order to get optimal training set during offline phase. Partial Least Squares (PLS) and Support Vector Regression (SVR) have been exploited for feature extraction and prediction technique respectively to have robust and accurate real time inversion during online phase.
Published: 2017
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3. Multi-trace boundary integral formulations with eddy current models

Author: Edouard Demaldent, Xavier Claeys, Laboratoire Jacques-Louis Lions (LJLL), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Jacques-Louis Lions ( LJLL ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ), Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: Electromagnetics, 01 natural sciences, Domain decomposition methods, law.invention, symbols.namesake, law, 0103 physical sciences, Eddy current, Integral equations, Mathematics, 010302 applied physics, [PHYS]Physics [physics], [ PHYS ] Physics [physics], Sub-domains, Time harmonic, Eddy current model, Mathematical analysis, Effective permittivity, Low-frequency, Integral equation, Boundary integral formulations, Homogeneous media, Computational electromagnetics, Maxwell's equations, Maxwell equations, symbols, Piecewise, Numerical stability
Abstract: Conference of 2017 International Applied Computational Electromagnetics Society Symposium - Italy, ACES 2017 ; Conference Date: 26 March 2017 Through 30 March 2017; Conference Code:127553; International audience; We are interested in boundary integral formulations adapted to the solution of low frequency inductive electromagnetics in the case where the geometry is partitioned in (potentially irregular) subdomains. In the context of electromagnetics in piecewise homogeneous media, the multi-trace formalism (MTF) provides boundary integral formulations for Maxwell's equations posed at the interfaces between different media, with the unknowns associated to one medium a priori decoupled from the unknowns associated to other media. This makes MTF a comfortable paradigm for integral equation based domain decomposition. This formalism is recent and, so far, has been studied only for electromagnetics in time harmonic regime. In this contribution, we adapt the multi-trace approach to the case where the effective permittivity vanishes in certain subdomains. We study the theoretical properties of these new formulations, and discuss its numerical stability.
Published: 2017
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4. A model to predict the ultrasonic field radiated by magnetostrictive effects induced by EMAT in ferromagnetic parts

Author: H Walaszek, A Lhémery, B Clausse, Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, CEntre Technique des Industries Mécaniques ( CETIM ), CEntre Technique des Industries Mécaniques - Cetim (FRANCE), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CEntre Technique des Industries Mécaniques (CETIM), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: Body force, History, Materials science, Acoustics, 01 natural sciences, Education, symbols.namesake, Condensed Matter::Materials Science, Magnetostrictive devices, External magnetic field, 0103 physical sciences, Surface properties, Electromagnetic acoustic transducers, Magnetostrictive effect, 010301 acoustics, Electromagnetic acoustic transducer, Ultrasonic testing, [PHYS]Physics [physics], 010302 applied physics, [ PHYS ] Physics [physics], Magnetoelastic interactions, Magnetism, Magnetostriction, Computer Science Applications, Magnetic field, Dynamics, Magnetoelastic couplings, Magnetostrictive strain, Magnetic fields, Surface distributions, symbols, Ferromagnetism, Ultrasonic sensor, Ferromagnetic materials, Mathematical transformations, Dynamic magnetic fields, Lorentz force, Excitation
Abstract: Conference of 15th Anglo-French Physical Acoustics Conference, AFPAC 2016 ; Conference Date: 13 January 2016 Through 15 January 2016; Conference Code:126251; International audience; An Electro-Magnetic Acoustic Transducer (EMAT) is a non-contact source used in Ultrasonic Testing (UT) which generates three types of dynamic excitations into a ferromagnetic part: Lorentz force, magnetisation force, and magnetostrictive effect. This latter excitation is a strain resulting from a magnetoelastic interaction between the external magnetic field and the mechanical part. Here, a tensor model is developed to transform this effect into an equivalent body force. It assumes weak magnetoelastic coupling and a dynamic magnetic field much smaller than the static one. This approach rigorously formulates the longitudinal Joule's magnetostriction, and makes it possible to deal with arbitrary material geometries and EMAT configurations. Transduction processes induced by an EMAT in ferromagnetic media are then modelled as equivalent body forces. But many models developed for efficiently predicting ultrasonic field radiation in solids assume source terms given as surface distributions of stress. To use these models, a mathematical method able to accurately transform these body forces into equivalent surface stresses has been developed. By combining these formalisms, the magnetostrictive strain is transformed into equivalent surface stresses, and the ultrasonic field radiated by magnetostrictive effects induced by an EMAT can be both accurately and efficiently predicted. Numerical examples are given for illustration.
Published: 2017
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5. A model to predict modal radiation by finite-sized sources in semi-infinite isotropic plates

Author: A Lhémery, S Grondel, M Stévenin, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520 (IEMN-DOAE), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Matériaux et Acoustiques pour MIcro et NAno systèmes intégrés - IEMN (MAMINA - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut d’Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520 ( IEMN ), and Ecole Centrale de Lille-Institut supérieur de l'électronique et du nunérique (ISEN)-Université de Valenciennes et du Hainaut-Cambresis ( UVHC ) -Université de Lille-Centre National de la Recherche Scientifique ( CNRS )
Subjects: History, Field (physics), Computation, Geometry, Reflection, Theoretical framework, Guided electromagnetic wave propagation, 01 natural sciences, Education, [SPI.MAT]Engineering Sciences [physics]/Materials, [SPI]Engineering Sciences [physics], Elastic guided waves, 0103 physical sciences, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 010301 acoustics, ComputingMilieux_MISCELLANEOUS, Mathematics, 010302 applied physics, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], Non destructive testing, [PHYS]Physics [physics], Guided wave testing, [ PHYS ] Physics [physics], Stationary phase methods, Semi-infinite, Plane (geometry), Time-dependent fields, Isotropy, Mathematical analysis, Plate-like structure, Infinite isotropic plate, Plates (structural components), Computer Science Applications, Nondestructive examination, Modal, Fraunhofer approximations, Reflection (physics)
Abstract: Conference of 15th Anglo-French Physical Acoustics Conference, AFPAC 2016 ; Conference Date: 13 January 2016 Through 15 January 2016; Conference Code:126251; International audience; Elastic guided wave (GW) propagation is involved in various non-destructive testing (NDT) techniques of plate-like structures. The present paper aims at describing an efficient model to predict the GW field radiated by various sources attached at a distance of the straight boundary of an isotropic plate, a configuration often encountered in typical examinations. Since the interpretation of GW propagation and scattering in plates is made easier by the use of modal description, the model is derived in the classical theoretical framework of modal solutions. Direct radiation by a uniform source of finite size in an isotropic plate can be efficiently modelled by deriving Fraunhofer-like approximation. A rigorous treatment is proposed based upon i) the stationary phase method to describe the field after reflection at a plate edge, ii) on the computation of modal reflection coefficients for an arbitrary incidence relative to the edge and iii) on the Fraunhofer approximation to account for the finite size of the source. The stationary phase method allows us to easily express the amplitude of reflected modes, that is to say, the way waves spread, including reflections involving mode conversions. The computation of modal reflection coefficients for plane GW at oblique incidence was recently treated in the literature and our work for this very problem simply consisted in adapting it to the SAFE calculation we use to compute modal solutions. The overall computation of the direct and reflected contributions is numerically very efficient. Once the total field is computed at a given frequency, the time-dependent field is obtained by simple Fourier synthesis.
Published: 2017
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6. Development and evaluation of f-k migration methods for fast ultrasonic imaging in solids

Author: Sebastien Robert, Lucas Merabet, Claire Prada, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, and ESPCI ParisTech
Subjects: Materials science, Computation time, Computation, Plane wave, Time domain analysis, 01 natural sciences, Frequency-domain methods, Matrix (mathematics), Optics, 3D f-k migration methods, 0103 physical sciences, Frequency domain analysis, Imaging systems, 10. No inequality, 010301 acoustics, Image resolution, Block (data storage), Ultrasonic testing, 010302 applied physics, Non destructive testing, [PHYS]Physics [physics], Spatial resolution, [ PHYS ] Physics [physics], Wave propagation, business.industry, Ultrasonic imaging, Elastic waves, Nondestructive examination, Plane wave imaging, Transducer array, Frequency domain, Development (differential geometry), Frequency domain algorithm, business
Abstract: Conference of 2016 IEEE International Ultrasonics Symposium, IUS 2016 ; Conference Date: 18 September 2016 Through 21 September 2016; Conference Code:124585; International audience; In this paper, we present two frequency-domain algorithms for 2D imaging in solids, namely Stolt's method and Lu's method, the latter being extended to the 3D imaging with matrix arrays. First, the performances of both frequency-domain methods are evaluated in 2D imaging and compared with the time-domain plane wave imaging (PWI). Then, Lu's method and PWI are applied to 3D to image a distribution of small porosities in a steel block. 2D and 3D images calculated with the f-k methods are comparable to the PWI images in terms of contrast and spatial resolution while achieving computation times more than 25 times shorter.
Published: 2016
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7. Results of the 2016 UT modeling benchmark proposed by the French Atomic Energy Commission (CEA) obtained with models implemented in CIVA software

Author: Souad Bannouf, Steve Mahaut, Sylvain Chatillon, Sébastien Lonné, Raphaële Raillon, Gwénaël Toullelan, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, EXTENDE, Bond L.J., Chimenti D.E., Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: 010302 applied physics, [PHYS]Physics [physics], Engineering, [ PHYS ] Physics [physics], business.industry, Aperture, Mode (statistics), 01 natural sciences, law.invention, Atomic energy commission, Software, law, Nondestructive testing, 0103 physical sciences, Eddy current, Benchmark (computing), Ultrasonic sensor, business, 010301 acoustics, Simulation
Abstract: Conference of 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2016 ; Conference Date: 17 July 2016 Through 22 July 2016; Conference Code:126650; International audience; For several years, the World Federation of NDE Centers, WFNDEC, proposes benchmark studies in which simulated results (in either ultrasonic, X-rays or eddy current NDT configurations) obtained with various models are compared to experiments. This year the proposed UT benchmark proposed by CEA concerns inspection configurations with multi-skips echoes i.e. the incident beam undergoes several skips on the surface and bottom of the specimen before interacting with the defect. This technique is commonly used to inspect thin specimen and/or in case of limited access inspection. This technique relies on the use of T45°mode in order to avoid mode conversion and to facilitate the interpretation of the echoes. The inspections were carried out with two probes of different aperture working at 5MHz.
Published: 2016
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8. Reflexion measurements for inverse characterization of steel diffusion bond mechanical properties

Author: Lionel Cachon, Emmanuel Rigal, Florian Le Bourdais, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département Technologie Nucléaire (DTN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Technique Conversion et Hydrogène (DTCH), Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux (LITEN), Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Bond L.J., Chimenti D.E., Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Département Technologie Nucléaire ( DTN ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Département des Technologies Biomasse et Hydrogène ( DTBH ), Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux ( LITEN ), Institut National de L'Energie Solaire ( INES ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre Scientifique et Technique du Bâtiment ( CSTB ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre Scientifique et Technique du Bâtiment ( CSTB ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut National de L'Energie Solaire ( INES ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre Scientifique et Technique du Bâtiment ( CSTB ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre Scientifique et Technique du Bâtiment ( CSTB ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: 010302 applied physics, [PHYS]Physics [physics], Work (thermodynamics), Materials science, [ PHYS ] Physics [physics], Mechanical engineering, Stiffness, Welding, Diffusion welding, 01 natural sciences, law.invention, Crystallography, law, Frequency domain, 0103 physical sciences, Heat exchanger, medicine, Diffusion (business), medicine.symptom, 010301 acoustics, Diffusion bonding
Abstract: Conference of 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2016 ; Conference Date: 17 July 2016 Through 22 July 2016; Conference Code:126650; International audience; The present work describes a non-destructive testing method aimed at securing high manufacturing quality of the innovative compact heat exchanger developed under the framework of the CEA R&D program dedicated to the Advanced Sodium Technological Reactor for Industrial Demonstration (ASTRID). The heat exchanger assembly procedure currently proposed involves high temperature and high pressure diffusion welding of stainless steel plates. The aim of the non-destructive method presented herein is to characterize the quality of the welds obtained through this assembly process. Based on a low-frequency model developed by Baik and Thompson [1], pulse-echo normal incidence measurements are calibrated according to a specific procedure and allow the determination of the welding interface stiffness using a nonlinear fitting procedure in the frequency domain. Performing the characterization of plates after diffusion welding using this method allows a useful assessment of the material state as a function of the diffusion bonding process.
Published: 2016
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9. Database generation and exploitation for efficient and intensive simulation studies

Author: Xavier Artusi, Christophe Reboud, Roberto Miorelli, Anis Ben Abdessalem, Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Bond L.J., Chimenti D.E., ANR-13-MONU-0011,ByPASS,Méthodes Bayesiennes pour le diagnostic et la Probabilité de détection Assistée par la Simulation ( 2013 ), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, ANR-13-MONU-0011,ByPASS,Méthodes Bayesiennes pour le diagnostic et la Probabilité de détection Assistée par la Simulation(2013), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: [PHYS]Physics [physics], 010302 applied physics, [ PHYS ] Physics [physics], [ INFO ] Computer Science [cs], Computer science, 020206 networking & telecommunications, 02 engineering and technology, computer.software_genre, 01 natural sciences, Statistical power, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, [INFO]Computer Science [cs], Sensitivity (control systems), Data mining, Stochastic inversion, computer, Simulation
Abstract: Conference of 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2015, Incorporating the 6th European-American Workshop on Reliability of NDE ; Conference Date: 26 July 2015 Through 31 July 2015; Conference Code:119404; International audience; This communication proposes a study on the application of surrogate modelling for intensive simulations studies. In particular, stochastic inversion approaches, model assisted probability of detection (MAPOD) and sensitivity analysis studies are addressed. Some illustrative examples, corresponding to real applications and involving different non-destructive testing methods, are also presented.
Published: 2016
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10. An efficient model to predict guided wave radiation by finite-sized sources in multilayered anisotropic plates with account of caustics

Author: S Grondel, A Lhémery, M Stévenin, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520 (IEMN-DOAE), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique ( IEMN-DOAE ), Institut d’Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520 ( IEMN ), Ecole Centrale de Lille-Institut supérieur de l'électronique et du nunérique (ISEN)-Université de Valenciennes et du Hainaut-Cambresis ( UVHC ) -Université de Lille-Centre National de la Recherche Scientifique ( CNRS ) -Ecole Centrale de Lille-Institut supérieur de l'électronique et du nunérique (ISEN)-Université de Valenciennes et du Hainaut-Cambresis ( UVHC ) -Université de Lille-Centre National de la Recherche Scientifique ( CNRS ), Ecole Centrale de Lille-Institut supérieur de l'électronique et du nunérique (ISEN)-Université de Valenciennes et du Hainaut-Cambresis ( UVHC ) -Université de Lille-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Matériaux et Acoustiques pour MIcro et NAno systèmes intégrés - IEMN (MAMINA - IEMN), and Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN)
Subjects: Diffraction, History, Engineering, Finite element method, Field (physics), Acoustics, Transducers, Tensors, Rectangular-shaped, Guided electromagnetic wave propagation, Diffraction effects, 01 natural sciences, Education, Optics, Elastic guided waves, Nondestructive testing, 0103 physical sciences, Tensor, 010301 acoustics, 010302 applied physics, Non destructive testing, [PHYS]Physics [physics], Guided wave testing, [ PHYS ] Physics [physics], business.industry, Isotropy, Plate-like structure, Anisotropic composites, Long-range propagation, Plates (structural components), Computer Science Applications, Nondestructive examination, Semi-analytic finite-element methods, Transducer, Anisotropy, business
Abstract: Conference of 14th Anglo-French Physical Acoustics Conference, AFPAC 2015 ; Conference Date: 14 January 2015 Through 16 January 2015; Conference Code:119474; International audience; Elastic guided waves (GW) are used in various non-destructive testing (NDT) methods to inspect plate-like structures, generated by finite-sized transducers. Thanks to GW long range propagation, using a few transducers at permanent positions can provide a full coverage of the plate. Transducer diffraction effects take place, leading to complex radiated fields. Optimizing transducers positioning makes it necessary to accurately predict the GW field radiated by a transducer. Fraunhofer-like approximations applied to GW in isotropic homogeneous plates lead to fast and accurate field computation but can fail when applied to multi-layered anisotropic composite plates, as shown by some examples given. Here, a model is proposed for composite plates, based on the computation of the approximate Green's tensor describing modal propagation from a source point, with account of caustics typically seen when strong anisotropy is concerned. Modal solutions are otherwise obtained by the Semi-Analytic Finite Element method. Transducer diffraction effects are accounted for by means of an angular integration over the transducer surface as seen from the calculation point, that is, over energy paths involved, which are mode-dependent. The model is validated by comparing its predictions with those computed by means of a full convolution integration of the Green's tensor with the source over transducer surface. Examples given concern disk and rectangular shaped transducers commonly used in NDT.
Published: 2016
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11. Ultrasonic imaging in coarse-grained stainless steels by total focusing method

Author: Claire Prada, Sebastien Robert, E. Lopez Villaverde, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL), Bond L.J., Chimenti D.E., Département Imagerie et Simulation pour le Contrôle ( DISC ), Laboratoire d'Intégration des Systèmes et des Technologies ( LIST ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, ESPCI ParisTech, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: 010302 applied physics, [PHYS]Physics [physics], Noise, Engineering, Optics, [ PHYS ] Physics [physics], business.industry, Operator (physics), 0103 physical sciences, business, 010301 acoustics, 01 natural sciences, Ultrasonic imaging
Abstract: Conference of 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2015, Incorporating the 6th European-American Workshop on Reliability of NDE ; Conference Date: 26 July 2015 Through 31 July 2015; Conference Code:119404; International audience; In the present work, the Total Focusing Method (TFM) is used to image flaws in coarse-grained steels with a contact phased-array probe. In order to reduce the noise introduced by the heterogeneous structure, as well as artifacts due to surface guided waves, the Decomposition of the Time Reversal Operator method is performed before calculating TFM images.
Published: 2015
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12. Multiscale modelling of the magnetic Barkhausen noise energy cycles

Author: P. Fagan, Anastasios Skarlatos, Benjamin Ducharne, Laurent Daniel, Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire Génie électrique et électronique de Paris (GeePs), CentraleSupélec-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Département Imagerie et Simulation pour le Contrôle (DISC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: Magnetic domain, Barkhausen noise, domain wall motion, 02 engineering and technology, 01 natural sciences, Magnetization, symbols.namesake, 0103 physical sciences, Statistical physics, [NLIN]Nonlinear Sciences [physics], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Barkhausen effect, 010302 applied physics, Physics, Tangent, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Magnetic hysteresis, magnetic hysteresis, Electronic, Optical and Magnetic Materials, Hysteresis, Domain wall (magnetism), magnetization rotation, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Rotation (mathematics)
Abstract: International audience; The magnetic Barkhausen noise (MBN) control is popular for materials characterization and as a magnetic Non-Destructive Testing & Evaluation (NDT & E) method. MBN comes from the erratic and unpredictable magnetic domains motion during the magnetization process. Its correlation to the micro-structural properties is evident. MBN is usually studied through time independent indicators, like the MBNenergy, which is obtained by integrating the square of the MBN voltage signal with respect to the time axis. By plotting the MBN energy as a function of the tangent excitation field H, a hysteresis cycle can be observed. After renormalization, the comparison with the classic induction vs excitation B(H) hysteresis loop provides interesting observations. Similar shapes can be observed if the domain wall contribution is preponderant in the magnetization process. On the contrary, strong differences appear if the magnetization rotation mechanism is stronger. There is no available standard for the exploitation of MBN control devices. Usual procedures rely on rejection thresholds based on empirical relations. In this domain, simulation tools able to refine these thresholds and improve the understanding of the physical behavior are highly desired. In this study, a simulation method combining a multiscale model for the anhysteretic behavior and the Jiles-Atherton theory is proposed to simulate precisely the MBNenergy hysteresis cycles. The use of the multiscale model allows separating the contributions of domain wall motion and magnetization rotation mechanisms. The satisfying simulation results validate the approach and constitute a major step toward a comprehensive simulation tool dedicated to MBN.
Published: 2021
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13. Magnetic Barkhausen noise : a simulation tool

Author: Anastasios Skarlatos, P. Fagan, Laurent Daniel, Benjamin Ducharne, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire Génie électrique et électronique de Paris (GeePs), CentraleSupélec-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), and Lustrement, Amandine
Subjects: 010302 applied physics, Physics, [SPI] Engineering Sciences [physics], General Physics and Astronomy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Magnetocrystalline anisotropy, 01 natural sciences, Signal, lcsh:QC1-999, Computational physics, symbols.namesake, Magnetization, Hysteresis, [SPI]Engineering Sciences [physics], Domain wall (magnetism), Ferromagnetism, 0103 physical sciences, symbols, 0210 nano-technology, Barkhausen effect, lcsh:Physics, Excitation, ComputingMilieux_MISCELLANEOUS
Abstract: Non-destructive magnetic controls are increasing in the industrial field. In this domain, the expectation for simulation tools able to anticipate the magnetic signature, improve the understanding and avoid fastidious and uncertain experimental pre-characterizations is high. Among different methods, the magnetic Barkhausen noise (MBN) control is one of the most popular. MBN raw signal is stochastic, not reproducible, and complex to exploit. MBNenergy, which is obtained by integrating the square of the MBN voltage signal with respect to the time axis is a much more stable indicator. Although the so-called MBNenergy is not, strictly speaking, an energy, it is connected to the domain wall motions and to their kinetic energy. By plotting MBNenergy as a function of H (the tangent surface excitation field), hysteresis cycles are observed. After a rescaling step, B(H) and MBNenergy(H) hysteresis cycles can be compared. They look similar for materials with high magnetocrystalline anisotropy (i.e. when the domain wall contribution is dominant over the magnetization rotation one during the magnetization process). In this study, a multiscale model is used to simulate a virtual anhysteretic behavior of a ferromagnetic steel with a magnetization process limited to the domain wall contribution. By using this anhysteretic contribution in the Jiles-Atherton model and running an inverse procedure, a MBN envelop can be obtained. By modulating the amplitude of an alternating, high frequency signal using this envelop, an accurate simulation of the raw Barkhausen noise is obtained.
Published: 2020

14. Guided wave imaging of composite plates using passive acquisitions by fiber Bragg gratings

Author: Olivier Mesnil, Guillaume Laffont, Oscar D’Almeida, Simon Nehr, Tom Druet, Arnaud Recoquillay, Margaux Horpin, Bastien Chapuis, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Capteurs Fibres Optiques (LCFO), Département Métrologie Instrumentation & Information (DM2I), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Safran Tech, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: Materials science, Optical fiber, Acoustics and Ultrasonics, Physics::Optics, Context (language use), 01 natural sciences, Signal, Delay and Sum, law.invention, Optics, passive imaging, Elastic guided waves, Arts and Humanities (miscellaneous), Fiber Bragg grating, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, law, sensor, Structural Health Monitoring, 0103 physical sciences, Fiber Bragg Grating, signal processing, 010301 acoustics, Instrumentation, 010302 applied physics, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], Guided wave testing, business.industry, Distributed and Quasi-distributed sensing, Excitelet, Optical Fiber Sensor, Fiber optic sensor, Ultrasonic sensor, Structural health monitoring, composite plates, business
Abstract: International audience; In this paper are presented imaging results of defects in composite plates using guided wave-based algorithms such as Delay and Sum and Excitelet. Those algorithms are applied to passive data, for which the signal corresponding to each emitter-receiver couple is recovered thanks to the cross-correlation of the ambient noise measured simultaneously by the two sensors. The transition to passive imaging allow the use of lighter sensors unable to emit ultrasonic waves such as Fiber Bragg Gratings sensors on optical fibers, which are used in this study. The imaging results presented here show the feasibility of active and passive imaging in composite plates using Fiber Bragg Gratings as receivers, reducing the impact of the acquisition system on the structure in the context of Structural Health Monitoring.
Published: 2020
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15. Model based characterisation of delamination by means of thermographic inspection

Author: Christophe Reboud, Dominique Lesselier, Almpion Ratsakou, Anastassios Skarlatos, Laboratoire de Simulation et de Modélisation Électromagnetique (LSME), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: 010302 applied physics, History, Engineering drawing, Thesaurus (information retrieval), Materials science, Delamination, imaging, 02 engineering and technology, fast analytical model, 021001 nanoscience & nanotechnology, 01 natural sciences, delamination, Computer Science Applications, Education, Thermographic inspection, active thermography, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [MATH.MATH-MP]Mathematics [math]/Mathematical Physics [math-ph], 0103 physical sciences, 0210 nano-technology, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract: The objective of the work presented in this paper is to propose a fast and accurate approach for the characterisation of the delamination in single-layer metallic planar pieces using infrared thermography. This approach is based on a combination of pre-processing techniques and inversion. The inversion has been done in a reduced parameter space since the preprocessing phase gives us information about the location and the shape of the flaws in the transverse plane. The estimation of the flaws’ parameters has been carried out by an iterative data fitting method involving a fast semi-analytical three-dimensional model. The robustness of the proposed approach is numerically assessed in presence of synthetic noisy data sets in different configurations.
Published: 2020
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16. The multi-mode plane wave imaging in the Fourier domain: Theory and applications to fast ultrasound imaging of cracks

Author: Sebastien Robert, Claire Prada, Lucas Merabet, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Langevin - Ondes et Images (UMR7587) (IL), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Institut Langevin - Ondes et Images, Université Paris Diderot - Paris 7 (UPD7)-ESPCI ParisTech-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)
Subjects: 010302 applied physics, Physics, [PHYS.MECA.VIBR]Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph], business.industry, Mechanical Engineering, Computation, Plane wave, Reconstruction algorithm, Condensed Matter Physics, [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Mechanics of the solides [physics.class-ph], 01 natural sciences, Sample (graphics), Image (mathematics), [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], Optics, Planar, Face (geometry), 0103 physical sciences, [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], Medical imaging, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, General Materials Science, business, 010301 acoustics, ComputingMilieux_MISCELLANEOUS
Abstract: International audience; The Total Focusing Method (TFM) was generalized about ten years ago to form images with complex ultrasoundpaths involving reflections and mode conversions at the interfaces of a testing sample. The resulting multi-mode imaging allows to fully image the face of a crack-type defect. More recently, the Plane Wave Imaging (PWI) was revisited to perform multi-mode reconstructions with a small number of transmissions compared to the TFM. In order to further accelerate the imaging process, we propose here to combine plane wave emissions with a fast reconstruction algorithm in the Fourier domain. The method was developed in medical imaging with the pioneeringworks of J.- Y. Lu, and was studied in a recent paper to form images in solids with direct reconstruction modes. In the present paper, the theory is extended to various reconstruction modes (half-skip and one-skip modes with/without mode conversions), and the imaging method is evaluated with experimental results in a sample featuring different planar defects. We show that the method provides multi-mode images equivalent to those computed with the time-domain PWI, while reducing the computation times by a factor up to 13.
Published: 2020
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17. The fast computation of eddy current distribution and probe response in homogenized composite material based on semi-analytical approach

Author: Denis Prémel, Houssem Chebbi, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: 010302 applied physics, Electromagnetic field, [PHYS]Physics [physics], Materials science, business.industry, Computation, Condensed Matter Physics, 01 natural sciences, Homogenization (chemistry), Finite element method, Electronic, Optical and Magnetic Materials, law.invention, law, Nondestructive testing, 0103 physical sciences, Eddy current, Boundary value problem, Composite material, business, 010301 acoustics, Instrumentation, Electrical impedance
Abstract: Due to the excessive use of composites in the industrial field, many numerical modeling ap- proaches dedicated to the characterization of such complex material by means of Non Destructive Testing Techniques were developed. In this paper, we present a numerical model dedicated to simulate the inspec- tion of unidirectional Carbon Fiber Reinforced Polymer using Eddy Current technique for detecting fiber disorientation. A semi-analytical model based on a modal approach is developed for the fast computation of quasi-static field induced by an arbitrary 3D Eddy Current probe in the material. Because of the high anisotropy and strong heterogeneity of such material, a prior phase of homogenization is assumed and the material is then considered as homogeneously anisotropic. The modal approach consists in resolving Maxwell’s equations in the Fourier domain. Therefore, the electromagnetic field is expressed as a sum of eigen-modes. To take into account the wave propagation through the multilayered structure and boundary conditions at each separating interface, a stable and recursive scattering matrix algorithm has been imple- mented. The impedance of the probe is computed analytically using Auld’s formula in orders to identify the main orientation of the fibers in the inspected zone. For numerical validation, simulated data provided by the model are compared to finite element data.
Published: 2020
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18. Use of meta-modelling for identification and interpolation of parametric hysteresis models applied to the characterization of carbon steels

Author: Anastassios Skarlatos, Christophe Reboud, A. Martínez-de-Guerenu, A. Lasaosa, Roberto Miorelli, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CEIT and TECNUN (University of Navarra), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: Materials science, Carbon steel, Identification problem, Parametric models, Different treatments, Mechanical engineering, 02 engineering and technology, Interval (mathematics), Isothermally annealed, engineering.material, Heat treatment, 01 natural sciences, Hysteresis loops, 0103 physical sciences, Parameter estimation, 0202 electrical engineering, electronic engineering, information engineering, Cold rolling, Electrical and Electronic Engineering, Microstructure, Parametric statistics, [PHYS]Physics [physics], 010302 applied physics, Hysteresis, 020208 electrical & electronic engineering, Sparse grid, Identification (control systems), Condensed Matter Physics, On-line evaluation, Interpolation, Electronic, Optical and Magnetic Materials, Parameter identification problem, Steel microstructure, Low carbon steel, Parametric model, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], engineering, Calculation procedure, Ferromagnetic materials, Metal cladding, Steel sheet, Meta-modelling
Abstract: International audience; The meta-modelling approach based on an adaptive sparse grid interpolator is proposed for tackling the identification problem of parametric hysteresis models for steels with different microstructures. Parametric models of Jiles-Atherton and Mel'gui, respectively, have been considered in this work. The main advantage of the present approach is the separation of the calculation procedure in a computationally demanding off-line phase, which has to be carried out only once, and a very fast on-line evaluation. This decomposition is particularly interesting when a large amount of successive evaluations has to be carried out. Especially in the case that we are interested in a particular family of ferromagnetic materials (e.g. steels subjected to different treatments), where the sought parameters are lying in a specific interval, a single meta-model may be sufficient to be used for the study of a wide range of specimens. The steel samples considered in this study have been obtained from industrially produced low carbon steel, 84% cold rolled, and isothermally annealed in laboratory.
Published: 2018
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19. Semianalytical method for the identification of inclusions by air-cored coil interaction in ferromagnetic media

Author: Dominique Lesselier, Panayiotis Vafeas, Anastassios Skarlatos, Theodoros Theodoulidis, Department of Chemical Engineering, University of Patras, Laboratoire de Simulation et de Modélisation Électromagnetique (LSME), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, MEANDER, Department of Mechanical Engineering, University of Western Macedonia [Kozani] (UoWM)-University of Western Macedonia [Kozani] (UoWM), Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), University of Patras [Greece], Laboratoire d'Intégration des Systèmes et des Technologies (LIST), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: Primary field, General Mathematics, 01 natural sciences, Harmonic analysis, [MATH.MATH-MP]Mathematics [math]/Mathematical Physics [math-ph], 0103 physical sciences, [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], Boundary value problem, 0101 mathematics, Mathematics, Parametric statistics, 010302 applied physics, Generalized function, ferromagnetic media, Mathematical analysis, General Engineering, Eigenfunction, Non-destructive evaluation, semi–analytical methods, 010101 applied mathematics, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Electromagnetic coil, air-cored coils, magneto-statics, harmonic analysis, Vector field
Abstract: The magnetostatic vector fields in terms of harmonic scalar potentials scattered by near–surface air inclusion of arbitrary shape, embedded in a conductive ferromagnetic medium, are investigated. The hollow inclusion is illuminated by a current–carrying coil, which serves as the primary field. The do-main of interest is separated into homogeneous subdomains under the assumption of a suitable truncation of the region of magnetostatic activity at a long distance from the incident source. Therein, the field is considered negligible and consequently a perfect magnetic boundary condition is implied. On the other hand, the introduced methodology addresses the full coupling between the two interfaces, i.e. the plane that distinguishes the half–space ferromagnetic material from the open air and the arbitrary surface among the inclusion and the ferromagnetic region. To this end, continuity conditions are applied in a rigorous way, while the expected behavior of the fields, either as ascending or as descending are taken into account. The scattering problem is solved by means of a modal approach, where potentials associated with the half–space are expanded via cylindrical harmonic eigenfunctions, while those related with the inclusion’s arbitrary geometry admit a generalized–type formalism, being the key to our method. However, since the transmission conditions involve potentials with different eigenexpansions, we are obliged to rewrite cylindrical to generalized functions and vice versa, obtaining handy relationships in terms of easy–to–handle integrals, where orthogonality then would be feasible. Once done, the calculation of the exact solutions leads to infinite linear algebraic systems, whose solution is achieved trivially through standard cut–off techniques. Thus, we obtain the implicated fields in a general analytical and compact fashion, independent of the inclusion’s geometry. In order to demonstrate the efficiency of the analytical model approach, we assume the degenerate case of a spherical inclusion, whereas the air–cored coil simulation via a numerical procedure validates our generalized method. The calculation is very fast, rendering it suitable for use with parametric inversion algorithms.
Published: 2018
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20. Optimizing magnetoresistive sensor signal-to-noise via pinning field tuning

Author: Claude Fermon, A. Solignac, Myriam Pannetier-Lecoeur, N. Sergeeva-Chollet, J. Moulin, Andrin Doll, E. Paul, Laboratoire Nano-Magnétisme et Oxydes (LNO), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), ANR-17-CE19-0021,NeuroTMR,Sondes magnétiques intégrées pour la cartographie de courants neuronaux(2017), and ANR-18-CE42-0001,CARAMEL,Outil de caractérisation des propriétés magnétiques à l'échelle nanométrique(2018)
Subjects: Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), Magnetic noise, Field (physics), Magnetoresistance, FOS: Physical sciences, 02 engineering and technology, Applied Physics (physics.app-ph), 01 natural sciences, Reduction (complexity), Stack (abstract data type), 0103 physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Anisotropy, 010302 applied physics, Physics, [PHYS]Physics [physics], Condensed Matter - Materials Science, business.industry, Electrical engineering, Materials Science (cond-mat.mtrl-sci), Physics - Applied Physics, Instrumentation and Detectors (physics.ins-det), 021001 nanoscience & nanotechnology, Magnetoresistive sensor, 0210 nano-technology, business, Sensitivity (electronics)
Abstract: The presence of magnetic noise in magnetoresistive-based magnetic sensors degrades their detection limit at low frequencies. In this paper, different ways of stabilizing the magnetic sensing layer to suppress magnetic noise are investigated by applying a pinning field, either by an external field, internally in the stack or by shape anisotropy. We show that these three methods are equivalent, could be combined and that there is a competition between noise suppression and sensitivity reduction, which results in an optimum total pinning field, for which the detection limit of the sensor is improved up to a factor of ten., Comment: 5 pages, 3 figures
Published: 2019
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21. Fast simulation approach dedicated to infrared thermographic inspection of delaminated planar pieces

Author: Almpion Ratsakou, Christophe Reboud, Dominique Lesselier, Anastassios Skarlatos, Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Simulation et de Modélisation Électromagnetique (LSME), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, L. J. Bond, S. Holland, and S. Laflamme, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: Materials science, Discretization, Acoustics, 02 engineering and technology, 01 natural sciences, TREE method, law.invention, Planar, law, [MATH.MATH-MP]Mathematics [math]/Mathematical Physics [math-ph], 020204 information systems, Nondestructive testing, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Eddy current, 010302 applied physics, [PHYS.PHYS]Physics [physics]/Physics [physics], business.industry, Delamination, non-destructive testing, eddy-current, Thermographic inspection, thermography, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Modal, Thermography, business, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract: International audience; Infrared thermography is a popular Non-Destructive Testing (NDT) technique that is typically used to detect delamination and volumetric flaws in composite materials, or to detect small cracks affecting metallic part near the piece surface. We propose a fast semi-analytical model based on Truncated Region Eigenfunction Expansion (TREE) method. The problem is thus solved in Laplace domain with respect to time and the temperature distribution is approximated by its expansion on a tensor product modal basis. This approach yields very fast and accurate results in tis domain of application. Configurations addressed by this model are inspections of stratified planar pieces containing thin delamination patches. Sources considered in this work are lamps providing an excitation at the surface of the inspected piece. The flaws are modelled as thin air gaps between the piece layers, which consist in an additional resistance to heat flow if the laminate is thermally stimulated. Hence, they are integrated in the modal approach and do not require additional discretization. This work complements a previous work aiming at treating 2D configurations involving induction coils as thermal sources . The principle of the theoretical approach will be exposed and quantitative comparisons with reference data from the literature will be presented.
Published: 2019
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22. A nonlinear Kernel-based adaptive learning-by-examples method for robust NDT/NDE of conductive tubes

Author: Christophe Reboud, Giacomo Oliveri, Shamim Ahmed, Nicola Anselmi, Andrea Massa, Paolo Rocca, Pierre Calmon, Roberto Miorelli, Marco Salucci, Università degli Studi di Trento (UNITN), Department of Information Engineering and Computer Science (ELEDIA Research Group), University of Trento [Trento], Laboratoire de Simulation et de Modélisation Électromagnetique (LSME), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), ELEDIA Research Center@DISI, University of Trento, via Sommarive 5, 38123 Trento, Italy (ELEDIA), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: 010302 applied physics, Adaptive sampling, business.industry, Computer science, Feature vector, Feature extraction, General Physics and Astronomy, 020206 networking & telecommunications, 02 engineering and technology, Inverse problem, 01 natural sciences, Electronic, Optical and Magnetic Materials, law.invention, Support vector machine, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, law, Nondestructive testing, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Eddy current, Adaptive learning, Electrical and Electronic Engineering, business, Algorithm, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract: International audience; In this work, the real-time non-destructive testing and evaluation (NDT/NDE) of faulty conductive tubes from eddy current (EC) measurements is addressed and solved in a computationally efficient way by means of an innovative learning-by-examples (LBE) methodology. More specifically, the estimation of the descriptors of a defect embedded within the cylindrical structure under test (SUT) is yielded by combining a non-linear feature extraction technique with an adaptive sampling strategy able to uniformly explore the arising feature space. Predictions are then performed during the on-line testing phase by means of a support vector regression (SVR). Representative results from a numerical/experimental validation are reported to assess the effectiveness of the proposed approach also in comparison with competitive state-of-the-art approaches.
Published: 2019
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23. Ultrasonic imaging of defects in coarse-grained steels with the decomposition of the time reversal operator

Author: Sebastien Robert, Claire Prada, Eduardo Lopez Villaverde, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: Synthetic transmit aperture imaging, Signal processing, Acoustics and Ultrasonics, Aperture, Acoustics, Time domain analysis, Guided electromagnetic wave propagation, 01 natural sciences, Decomposition of the time reversal operator, Matrix (mathematics), Filtering operations, Arts and Humanities (miscellaneous), Frequency domains, Singular vectors, 0103 physical sciences, Singular value decomposition, Frequency domain analysis, Time domain, 010301 acoustics, Ferritic steel, [PHYS]Physics [physics], 010302 applied physics, Physics, Strong scatterings, Signal to noise ratio, Ultrasonic imaging, Data acquisition, Heterogeneous structures, Surface waves, Transfer matrix, Singular value, Noise, Frequency domain, Ultrasound images, Surface defects, Transfer matrix method
Abstract: International audience; In the present work, the Synthetic Transmit Aperture (STA) imaging is combined with the Decomposition of the Time Reversal Operator (DORT) method to image a coarse grained austenitic-ferritic steel using a contact transducer array. The highly heterogeneous structure of this material produces a strong scattering noise in ultrasound images. Furthermore, the surface waves guided along the array interfere with the bulk waves backscattered by defects. In order to overcome these problems, the DORT method is applied before calculating images with the STA algorithm. The method consists in analyzing in the frequency domain the singular values and singular vectors of the full array transfer matrix. This paper first presents an analysis of the singular values of different waves contained in the data acquisition, which facilitates the identification of the subspace associated with the surface guided waves for filtering operations. Then, a filtered matrix is defined where the contribution of structural noise and guided waves are reduced. Finally, in the time domain, the STA algorithm is applied to this matrix in order to calculate an image with reduced structural noise. Experiments demonstrate that this filtering improves the signal-to-noise ratio by more than 12 dB in comparison with the STA image before filtering.
Published: 2016
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24. Development of the Specular Echoes Estimator to predict relevant modes for Total Focusing Method imaging

Author: Olivier Roy, Philippe Brédif, Ekaterina Iakovleva, Dominique Lesselier, Kombossé Sy, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), M2M-NDT, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: 010302 applied physics, Diffraction, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], Computer science, Phased array, Mechanical Engineering, Acoustics, Ultrasonic testing, diffraction, Reflector (antenna), Condensed Matter Physics, TFM imaging, 01 natural sciences, SEE, specular echoes, Planar, Position (vector), [MATH.MATH-MP]Mathematics [math]/Mathematical Physics [math-ph], 0103 physical sciences, halfskip TFM, General Materials Science, Ultrasonic sensor, Specular reflection, 010301 acoustics, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract: International audience; Total Focusing Method imaging is an ultrasonic testing method which has emerged in recent years as an alternative to standard phased array inspection methods in non-destructive testing, due to its high resolution and the realistic images of defects that it provides.In the case of crack-like defects, it provides images where the proﬁle and the tips of the defects are reconstructed. TFM imaging is a procedure which yields the spatial position of the reﬂectors from which the main transient signals observed in the data are originated from. Thereby, diﬀraction echoes are located at the tips of the defect, and specular echoes appear along the proﬁle of the defect. This signature allows the characterization of the planar nature of the defect. However, a correct reconstruction requires the use of the relevant ultrasonic path to produce the echoes wanted among a large number of possible paths between the array transducer and the reﬂector. In this paper, we have developed a method based on physical considerations, for predicting relevant paths. The tool is applied in several inspection conﬁgurations involving notches nearby welds. Validation is achieved from avariety of synthetic and experimental results.
Published: 2018
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25. Study of the non-linear eddy-current response in a ferromagnetic plate: Theoretical analysis for the 2D case

Author: Anastassios Skarlatos, Theodoros Theodoulidis, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: FOS: Physical sciences, 02 engineering and technology, Physics - Classical Physics, 01 natural sciences, law.invention, Harmonic excitation, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Eddy current, General Materials Science, Experimental work, Fourier domain, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Physics, [PHYS]Physics [physics], Total harmonic distortion, Mechanical Engineering, 020208 electrical & electronic engineering, Mathematical analysis, Classical Physics (physics.class-ph), Eigenfunction, Condensed Matter Physics, Nonlinear system, Ferromagnetism
Abstract: The non-linear induction problem in an infinite ferromagnetic pate is studied theoretically by means of the truncated region eigenfunction expansion (TREE) for the 2D case. The non-linear formulation is linearised using a fixed-point iterative scheme, and the solution of the resulting linear problem is constructed in the Fourier domain following the TREE formalism. The calculation is carried out for the steady-state response under harmonic excitation and the harmonic distortion is derived from the obtained spectrum. This article is meant to be the theoretical part of a study, which will be complemented by the corresponding experimental work in a future communication.
Published: 2018
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26. Noise Filtering in the Synthetic Transmit Aperture Imaging by Decomposition of the Time Reversal Operator: Application to Flaw Detection in Coarse-grained Stainless Steels

Author: Eduardo Lopez Villaverde, Claire Prada, Sebastien Robert, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Langevin - Ondes et Images (UMR7587) (IL), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)
Subjects: Synthetic transmit aperture imaging, ultrasonic imaging, Materials science, Aperture, Phased array, Acoustics, Guided electromagnetic wave propagation, Physics and Astronomy(all), 01 natural sciences, Spurious signal noise, Decomposition of the time reversal operator, Nondestructive testing, 0103 physical sciences, Decomposition (computer science), 010301 acoustics, Ultrasonic testing, Audio signal processing, Non destructive testing, [PHYS]Physics [physics], 010302 applied physics, business.industry, Operator (physics), non-destructive testing, Heterogeneous structures, Phased array probes, Nondestructive examination, Ultrasonic applications, Ultrasonic imaging, Synthetic apertures, Noise, noise filtering, Flaw detection, heterogeneous materials, Antenna phased arrays, business, Materials testing, phased-array
Abstract: Conference of ICU International Congress on Ultrasonics, ICU 2015 ; Conference Date: 11 May 2015 Through 14 May 2015; International audience; In the present work, the Synthetic Transmit Aperture (STA) imaging is applied on coarse grained steels using a contact phased-array probe. In order to reduce the noise introduced by the heterogeneous structure, as well as artifacts due to surface guided waves, the Decomposition of the Time Reversal Operator method is performed before calculating STA images.
Published: 2015
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27. Defect imaging on CFRP and honeycomb composite structures by guided waves generated and detected by a sparse PZT array

Author: Oscar D’Almeida, Olivier Mesnil, Nas-Redine Bedreddine, Andrii Kulakovskyi, Bastien Chapuis, Alain Lhémery, Safran Tech, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Georgia Institute of Technology [Atlanta], Fu-Kuo Chang, Fotis Kopsaftopoulos, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: 010302 applied physics, Carbon fiber reinforced polymer, [PHYS]Physics [physics], Materials science, business.industry, Acoustics, Attenuation, Composite number, 01 natural sciences, Core (optical fiber), Honeycomb structure, 0103 physical sciences, Honeycomb, Structural health monitoring, Aerospace, business, 010301 acoustics
Abstract: International audience; Sandwich honeycomb structures (aluminum core bonded to Carbon Fiber Reinforced Polymer (CFRP) sheets on either side) are widely employed in the aerospace industry for their high strength to mass ratio. However, they might be subjected to damages such as delaminations of the composite sheets or debondings between the face sheets and the core due to impacts or thermo-mechanical aging. In order to reduce maintaining costs and extend the service time, Guided Waves (GW) based Structural Health Monitoring (SHM) systems are considered an adequate solution. Indeed, GW propagate over long distances and exhibit low attenuation, thus allowing to monitor wide areas with a limited number of sensors. Defect imaging on CFRP composites and honeycomb composite structures using both Delay-And-Sum [1] and correlation-based algorithm Excitelet [2] is presented in this communication. A machine learning algorithm is finally implemented in order to automatically identify and isolate defects on a given cartography map. The machine learning algorithm is trained on an experimental database of false and positive results obtained on representative specimens.
Published: 2017
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28. Design of a flexible eddy current probe in view of the evaluation of the electrical conductivity during inspection of defects

Author: Jean-Marc Decitre, Benjamin Delabre, Yann Le Bihan, Laboratoire Instrumentation et Capteurs (LIC), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CEA Tech en régions (CEA-TECH-Reg), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire Génie électrique et électronique de Paris (GeePs), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: 010302 applied physics, Materials science, Mechanical Engineering, Conductive materials, 020208 electrical & electronic engineering, Single measurement, General Physics and Astronomy, Mechanical engineering, Context (language use), 02 engineering and technology, Conductivity, 01 natural sciences, law.invention, [SPI]Engineering Sciences [physics], Mechanics of Materials, law, Electrical resistivity and conductivity, Eddy-current testing, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Eddy current, General Materials Science
Abstract: International audience; There are several methods for the evaluation of the electrical conductivity of a material but many of them are difficult to implement in an industrial context. The aim of this study is to develop a non-contact probe to evaluate the electrical conductivity during the inspection of defects in the case of purely conductive materials. For this purpose the eddy current testing method is used. In this study, the comparison between several probe configurations is performed to reduce the lift-off effect. All simulations were performed with the simulation platform CIVA. An optimized probe was realized according to the following criterion: get a straight response of the probe in the complex plane when the electrical conductivity evolves. The probe is evaluated experimentally on conductivity standards and materials with surface defects. The experimental measurements show a good fit with the simulated results obtained by CIVA. In a single measurement, the evaluation of the electrical conductivity and the inspection of defects is achieved.
Published: 2016
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29. Single crystal elastic constants evaluated with surface acoustic waves generated and detected by lasers within polycrystalline steel samples

Author: P. Calmon, Nikolay Chigarev, Damien Gasteau, Vitaly Gusev, Vincent Tournat, L. Ducousso-Ganjehi, F. Jenson, Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: 010302 applied physics, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], Materials science, business.industry, Surface acoustic wave, General Physics and Astronomy, Acoustic wave, 01 natural sciences, Molecular physics, Lamb waves, Optics, Surface wave, 0103 physical sciences, Acoustic wave equation, Crystallite, Texture (crystalline), business, 010301 acoustics, Single crystal, ComputingMilieux_MISCELLANEOUS
Abstract: We report on a laser generated and detected surface acoustic wave method for evaluating the elastic constants of micro-crystals composing polycrystalline steel. The method is based on the measurement of surface wave velocities in many micro-crystals oriented randomly relative to both the wave propagation direction and the sample surface. The surface wave velocity distribution is obtained experimentally thanks to the scanning potentiality of the method and is then compared to the theoretical one. The inverse problem can then be solved, leading to the determination of three elastic constants of the cubic symmetry micro-crystals. Extensions of the method to the characterization of texture, preferential orientation of micro-crystals or welds could be foreseen.
Published: 2016
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30. Transformation of body force generated by non-contact sources of ultrasound in an isotropic solid of complex shape into equivalent surface stresses

Author: Alain Lhémery, Bastien Clausse, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: Body force, ultrasonics, General Physics and Astronomy, Eigenstrain, 01 natural sciences, Stress (mechanics), 0103 physical sciences, Surface properties, 010301 acoustics, Ultrasonic testing, 010302 applied physics, Physics, [PHYS]Physics [physics], Applied Mathematics, Surface stress, Elastic waves, isotropy, Isotropy, Non-contact, Mechanics, Wave equation, Dynamics, Nondestructive examination, Computational Mathematics, Elastic wave radiation, Classical mechanics, Modeling and Simulation, wave modeling, Isotropic solid, Tensorial analysis, wave equation, elastic wave, Ultrasonic NDE, Electric excitation
Abstract: International audience; Non-contact techniques in ultrasonic nondestructive evaluation use external non-mechanical excitation (electromagnetic, heat) which interacts with the mechanical part to be tested. The part itself becomes the source of ultrasounds by transforming the non-mechanical energy into a mechanical one. This process involves the generation of dynamic body forces or of an eigenstrain that can be modeled as equivalent body forces, these forces being confined in the vicinity of the part surface. Many models developed for predicting ultrasonic field radiation in solids assume source terms given as surface distributions of stress. In order to predict ultrasonic fields radiated by non-contact sources by means of these radiation models, we developed a method to transform dynamic body forces into equivalent surface stress distributions, irrespective of the nature of the excitation. The approximate transformation relies on a second order expansion of Green's integral formulation of the elastic wave equation. To make this transformation applicable broadly, the geometry of the surface considered herein is of complex shape, implying thorough differential and tensorial analyses to achieve our aim. Some assumptions, notably isotropic elasticity, are made in deriving the transformation method, which are discussed in detail to clearly define its applicability. Numerical examples of radiated fields are given for illustration and validation.
Published: 2016
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31. Plane Wave Imaging for ultrasonic non-destructive testing: Generalization to multimodal imaging

Author: Sebastien Robert, Claire Prada, Léonard Le Jeune, Eduardo Lopez Villaverde, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Paris Diderot - Paris 7 (UPD7), Institut Langevin - Ondes et Images (UMR7587) (IL), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 010302 applied physics, Coupling, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], Defect characterization, Acoustics and Ultrasonics, business.industry, Image quality, Computer science, Generalization, Ultrasonic imaging, Acoustics, Plane wave, Non-destructive testing, 01 natural sciences, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], Optics, Region of interest, Transducer array, Nondestructive testing, 0103 physical sciences, Point (geometry), Ultrasonic sensor, business, 010301 acoustics
Abstract: Pre-print; International audience; This paper describes a new ultrasonic array imaging method for Non-Destructive Testing (NDT) which is derived from the medical Plane Wave Imaging (PWI) technique. The objective is to perform fast ultrasound imaging with high image quality. The approach is to transmit plane waves at several angles and to record the back-scattered signals with all the array elements. Focusing in receive is then achieved by coherent summations of the signals in every point of a region of interest. The medical PWI is generalized to immersion setups where water acts as a coupling medium and to multimodal (direct, half-skip modes) imaging in order to detect different types of defects (inclusions, porosities, cracks). This method is compared to the Total Focusing Method (TFM) which is the reference imaging technique in NDT. First, the two post-processing algorithms are described. Then experimental results with the array probe either in contact or in immersion are presented. A good agreement between the TFM and the PWI is observed, with three to ten times less transmissions required for the PWI.
Published: 2016
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32. Solution of the WFNDEC 2015 eddy current benchmark with surface integral equation method

Author: Edouard Demaldent, Roberto Miorelli, Christophe Reboud, Theodoros Theodoulidis, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Department of Mechanical Engineering, University of Western Macedonia [Kozani] (UoWM), Bond L.J., Chimenti D.E., and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: [PHYS]Physics [physics], 010302 applied physics, Electromagnetic field, Surface (mathematics), Mathematical optimization, Property (programming), CPU time, 020206 networking & telecommunications, 02 engineering and technology, Solver, 01 natural sciences, Finite element method, law.invention, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Benchmark (computing), Eddy current, Applied mathematics, ComputingMethodologies_COMPUTERGRAPHICS, Mathematics
Abstract: Conference of 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2015, Incorporating the 6th European-American Workshop on Reliability of NDE ; Conference Date: 26 July 2015 Through 31 July 2015; Conference Code:119404; International audience; In this paper, a numerical solution of WFNDEC 2015 eddy current benchmark is presented. In particular, the Surface Integral Equation (SIE) method has been employed for numerically solving the benchmark problem. The SIE method represent an effective and efficient alternative to standard numerical solver like Finite Element Method (FEM) when electromagnetic fields need to be calculated in problems involving homogeneous media. The formulation of SIE method allows to properly solve the electromagnetic problem by meshing the surface of the media instead to the complete media volume as done in FEM. The surface meshing enables to describe the problem with a smaller number of unknowns with respect to FEM. This property is directly translated in an obvious gain in terms of CPU time efficiency.
Published: 2016
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33. A multi-step solution algorithm for Maxwell boundary integral equations applied to low-frequency electromagnetic testing of conductive objects

Author: Edouard Demaldent, Marc Bonnet, Audrey Vigneron, Propagation des Ondes : Étude Mathématique et Simulation (POEMS), Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Unité de Mathématiques Appliquées (UMA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-Centre National de la Recherche Scientifique (CNRS), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: 010302 applied physics, Physics, Electromagnetics, Mathematical analysis, Sigma, Boundary (topology), 020206 networking & telecommunications, Context (language use), 02 engineering and technology, Low frequency, 01 natural sciences, Integral equation, Omega, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, Electronic, Optical and Magnetic Materials, law.invention, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Eddy current, Electrical and Electronic Engineering
Abstract: We consider the solution, using boundary elements (BEs), of the surface integral equation (SIE) system arising in electromagnetic testing of conducting bodies, with an emphasis on situations, such that $o(1) \leq ({\omega \varepsilon _{0}/\sigma })^{1/2} \leq O(1)$ and $L ({\omega \sigma \mu _{0}})^{1/2} = O(1)$ , which includes in particular the case of eddy current (EC) testing and assuming $L\omega ({\varepsilon _{0} \mu _{0}})^{1/2} \leq 2\pi $ , i.e., low-frequency conditions ( $L$ : diameter of conducting body). Earlier approaches for dielectric objects at low frequencies are not applicable in the present context. After showing that a simple normalization of the BE system significantly improves its conditioning, we propose a multi-step solution method based on block-successive over-relaxation iterations, which facilitates the use of direct solvers and converges within a few iterations for the considered range of physical parameters. This new treatment, albeit simple, allows to perform EC-type analyses using standard Maxwell SIE formulations, avoiding the adverse consequences of ill-conditioning for low frequencies and high conductivities. Its performance and limitations are studied on three numerical examples involving low frequencies and high conductivities.
Published: 2016
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34. Numerical modeling of laser-induced shock experiments for the development of the adhesion test for bonded composite materials

Author: Fabienne Touchard, Michel Boustie, Nicolas Dominguez, Laurent Berthe, Romain Ecault, Airbus Group Innovations [Suresnes], Airbus [France], Institut Pprime (PPRIME), ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Airbus Group Innovations [Toulouse], Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: Shock wave, Work (thermodynamics), Materials science, Composite number, 02 engineering and technology, Sciences de l'ingénieur, 01 natural sciences, Paint adhesion testing, law.invention, Adhesion test, [SPI]Engineering Sciences [physics], law, 0103 physical sciences, Calibration, Composite material, Laser-induced shock, Civil and Structural Engineering, 010302 applied physics, Fibre-reinforced plastic, 021001 nanoscience & nanotechnology, Laser, Bonded composites, Shock (mechanics), CFRP composites, Bonding quality assessment, Ceramics and Composites, 0210 nano-technology, Shock propagation modeling, Adhesion test - Bonded composites - Bonding quality assessment - CFRP composites - Laser-induced shock - Shock propagation modeling
Abstract: International audience; In this work, laser shock experiments on composite material are modeled. Focus is made on the development of a reliable numerical model to be used for the laser shock wave adhesion test of bonded composites. Technique principle is explained as well as the laser shock experiment procedure. Then, the numerical investigations are presented. A calibration method is given to set the model input parameters, and the modeling choices are detailed. Dynamic material parameters are identified thanks to experimental results, and validated through a complete campaign of laser shocks on various carbon fiber reinforced plastic (CFRP) materials (monolithic and bonded). Finally, numerical results for bonded composites are discussed. They enable to understand the stress distribution within the composite assembly during the wave propagation. This is a key step toward the development of a reliable and controlled laser shock adhesion test.
Published: 2016
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35. Development of methods for the analysis of multi-mode TFM images

Author: Kombossé Sy, Ekaterina Iakovleva, Olivier Roy, Philippe Brédif, Dominique Lesselier, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, M2M-NDT, Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: History, ultrasonics, Computer science, 01 natural sciences, Education, [MATH.MATH-MP]Mathematics [math]/Mathematical Physics [math-ph], Nondestructive testing, 0103 physical sciences, Point (geometry), 010301 acoustics, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], 010302 applied physics, Infinite number, Total Focusing Method, business.industry, Mode (statistics), non-destructive testing, Computer Science Applications, Characterization (materials science), [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Transducer, multi-mode, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Ultrasonic sensor, Development (differential geometry), business, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, Algorithm
Abstract: TFM (Total Focusing Method) is an advanced post-processing imaging algorithm of ultrasonic array data that shows good potential in defect detection and characterization. It can be employed using an infinite number of paths between transducer and focusing point. Depending upon the geometry and the characteristics of the defect in a given part, there are not the same modes that are appropriate for the defect reconstruction. Furthermore, non-physical indications can be observed, prone to misinterpretation. These imaging artifacts are due to the coexistence of several contributions involving several modes of propagation and interactions with possible defects and/or the geometry of the part. Two methods for filtering artifacts and reducing the number of TFM images are developed and illustrated.
Published: 2018
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36. Calculation of the Eddy-Current Flow Around a Cylindrical Through-Hole in a Finite-Thickness Plate

Author: Anastassios Skarlatos, Theodoros Theodoulidis, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, MEANDER, Department of Mechanical Engineering, University of Western Macedonia [Kozani] (UoWM)-University of Western Macedonia [Kozani] (UoWM), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: 010302 applied physics, Physics, eddy-current testing (ECT), fastener inspection, Mechanics, 01 natural sciences, Integral equation, Electronic, Optical and Magnetic Materials, law.invention, mode matching, Superposition principle, [SPI]Engineering Sciences [physics], Planar, law, 0103 physical sciences, Eddy current, Boundary value problem, impedance calculation, Electrical and Electronic Engineering, Domain truncation, 010301 acoustics, Finite thickness, Electrical conductor, Vector potential
Abstract: International audience; A semianalytical solution to the eddy-current induction problem in a conducting, nonmagnetic plate near a cylindrical through-holeis derived by means of the second-order vector potential and the domain truncation technique. The construction of a solution, which simultaneously satisfies the field continuity across the cylindrical surface of the hole and the planar interfaces of the plate, proves to be a very challenging problem, and thus, a special superposition of partial subsolutions is proposed. The presented solution is part of a more general development aiming at the calculation of the probe interaction with material flaws located in the vicinity of the hole by means of the integral equation formalism. These tasks will be the subject of a future paper. The comparison of the semianalytical results against both finite-element simulations as well as experimental data demonstrates excellent agreement.
Published: 2015
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37. Semi-analytical calculation of the low-frequency electromagnetic scattering from a near-surface spherical inclusion in a conducting half-space

Author: Theodoros Theodoulidis, Anastassios Skarlatos, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Department of Mechanical Engineering, University of Western Macedonia [Kozani] (UoWM), CIVAMONT collaboration, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: domain truncation, Primary field, General Mathematics, domain, General Physics and Astronomy, Geometry, 01 natural sciences, law.invention, 010309 optics, law, 0103 physical sciences, Eddy current, applied mathematics, [INFO]Computer Science [cs], [MATH]Mathematics [math], eddy-currents, Parametric statistics, Mathematics, mathematical modelling Keywords: low-frequency scattering, 010302 applied physics, Subject Areas: electromagnetism, Scattering, mode-matching, General Engineering, non-destructive testing, Half-space, Computational physics, Modal, spherical inclusions, Electromagnetic coil, Excited state, low-frequency scattering
Abstract: International audience; The low-frequency electromagnetic scattering problem of a near-surface hollow spherical inclusion is solved by means of a modal approach. The primary field is excited using a current-carrying coil. The presented solution addresses the full coupling between the two interfaces of the geometry in a rigorous way. There is a direct physical interpretation of the different occurring terms in the formal solution, which provides a deeper understanding of the underlying phenomena. The calculation is very fast, which makes the proposed model suitable for use with parametric inversion algorithms.
Published: 2014
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38. Finite element simulation of the probe displacement in eddy current testing

Author: L. Santandrea, H. Zaidi, Yann Le Bihan, Edouard Demaldent, Guillaume Krebs, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: 010302 applied physics, [PHYS]Physics [physics], Engineering, business.industry, Mechanical Engineering, Computation, 010401 analytical chemistry, Mechanical engineering, Condensed Matter Physics, 01 natural sciences, Finite element method, Displacement (vector), 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Mechanics of Materials, Position (vector), Eddy-current testing, Component (UML), 0103 physical sciences, Point (geometry), Decomposition method (constraint satisfaction), Electrical and Electronic Engineering, business, Simulation
Abstract: In this paper an approach is proposed for the taking into account of the displacement of the probe in the finite element simulation of eddy current testing. The proposed approach allows to reduce the difficulties associated to the finite element meshing. The computations are performed using two finite element formulations. Two test ECT problems are proposed. Numerical results are compared with experimental data. Eddy current testing (ECT) is widely used for the inspection of conductive industrial components. Simulation techniques are needed for the design of ECT probes and for the analysis of the ECT signals issued from inspections. The finite element method (FEM), with its flexibility and its ability to handle complex geometries, plays an important role in the modelling techniques used in ECT. Nevertheless, an efficient FEM simulation of ECT leads to consider some problems. The first problem is how simulate the complete inspection of a component (probe scan) without remeshing at each ECT probe position relatively to the component. To take into account the differ- ent positions of the probe when the FEM is used, a full or partial remeshing can be used. However from a computational cost point of view, this approach can be unfavourable when, for example, hundreds of probe positions are considered. A solution is then to use a mesh connecting method (i.e. a domain decomposition method) with a mesh related to the probe and another related to the component. The second difficulty is to take into account efficiently the thin regions that can be present in an ECT problem: lift-off (probe-component distance), thin coatings, thin deposits, flat coils.... Indeed, find a suitable mesh with a good compromise between the number of elements and their quality is uneasy. In orderto overcomethe problemscausedby the thin regionsin the FEM the most appropriatesolution is to model these areas with special elements. In fact, with a simplicial mesh, it is difficult to have a good quality of mesh in a thin region with a reasonable number of elements. It is therefore recommended to
Published: 2014
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39. Paraxial ray-tracing approach for the simulation of ultrasonic inspection of welds

Author: Audrey Gardahaut, Karim Jezzine, Didier Cassereau, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département d'Architectures, Conception et Logiciels Embarqués-LIST (DACLE-LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire d'Imagerie Paramétrique (LIP), Université Pierre et Marie Curie - Paris 6 (UPMC)-IFR58-Centre National de la Recherche Scientifique (CNRS), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: 010302 applied physics, [PHYS]Physics [physics], Materials science, Differential equation, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Weld Inspection, Ultrasonic testing, Paraxial approximation, Paraxial Rays, Image processing, 01 natural sciences, Finite element method, law.invention, Ray tracing (physics), Optics, law, 0103 physical sciences, Ultrasonic sensor, Cartesian coordinate system, business, 010301 acoustics, Dynamic Ray Tracing Method
Abstract: Conference of 40th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2013, Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics, ICBM 2013 ; Conference Date: 21 July 2013 Through 26 July 2013; Conference Code:105840; International audience; On-site inspection of bimetallic or austenitic welds can be very difficult to interpret owing to their internal structures. Skewing and splitting of the ultrasonic beam may occur due to the anisotropic and inhomogeneous properties of the welding material. In this paper, we present a ray-based method to simulate the propagation of ultrasonic waves in such structures. The formalism is based on dynamic ray tracing system in Cartesian coordinates along a reference ray. Standard ray tracing consists in the solution of a system of linear ordinary differential equations of the first order and is used to determine the trajectory of the ray. Likewise, dynamic ray tracing (DRT) also called paraxial ray tracing consists in the solution of an additional system of linear ordinary differential equations along the ray allowing paraxial quantities to be computed. It is used to evaluate the geometrical spreading and amplitude along the ray and in its vicinity. DRT is applied on a smooth representation of the elastic properties of the weld obtained thanks to an image processing technique applied on a macrograph of the weld. Simulation results are presented and compared to finite elements and experimental results.
Published: 2014
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40. Development of electromagnetic acoustic transducer (EMAT) phased arrays for SFR inspection

Author: Benoı̂t Marchand, Florian Le Bourdais, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: [PHYS]Physics [physics], 010302 applied physics, Engineering, business.industry, Acoustics, Instrumentation, Ultrasonic testing, 01 natural sciences, Piezoelectricity, Visualization, Transducer, Sodium-cooled fast reactor, 0103 physical sciences, business, 010301 acoustics, Casing, Electromagnetic acoustic transducer
Abstract: Conference of 40th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2013, Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics, ICBM 2013 ; Conference Date: 21 July 2013 Through 26 July 2013; Conference Code:105840; International audience; A long-standing problem for Sodium cooled Fast Reactor (SFR) instrumentation is the development of efficient under-sodium visualization systems adapted to the hot and opaque sodium environment. Electromagnetic Acoustic Transducers (EMAT) are potential candidates for a new generation of Ultrasonic Testing (UT) probes well-suited for SFR inspection that can overcome drawbacks of classical piezoelectric probes in sodium environment. Based on the use of new CIVA simulation tools, we have designed and optimized an advanced EMAT probe for under-sodium visualization. This has led to the development of a fully functional L-wave EMAT sensing system composed of 8 elements and a casing withstanding 200°C sodium inspection. Laboratory experiments demonstrated the probe's ability to sweep an ultrasonic beam to an angle of 15 degrees. Testing in a specialized sodium facility has shown that it was possible to obtain pulse-echo signals from a target under several different angles from a fixed position.
Published: 2014
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41. EMAT generation of bulk forces in a ferromagnetic plate and their equivalent surface stresses

Author: C Aristégui, Clémence Rouge, Alain Lhémery, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut National de la Recherche Agronomique (INRA), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)
Subjects: Body force, History, Engineering, Wave generation, Acoustics, Conductive media, Guided electromagnetic wave propagation, 01 natural sciences, Education, Shear flow, Non-linear phenomena, Acoustic transducers, Lamb waves, Quasi-closed-form solutions, Surface properties, 0103 physical sciences, Electromagnetic acoustic transducers, 010301 acoustics, Electromagnetic acoustic transducer, [PHYS]Physics [physics], 010302 applied physics, business.industry, Elastic waves, Shear horizontal guided waves, Surface stress, Magnetostriction, Surface waves, Coupling medium, Ferromagnetic plate, Piezoelectricity, Nondestructive examination, Computer Science Applications, Surface wave, Ferromagnetism, Ferromagnetic materials, business, Material properties
Abstract: Conference of 12th Anglo-French Physical Acoustics Conference, AFPAC 2013 ; Conference Date: 16 January 2013 Through 18 January 2013; Conference Code:104840; International audience; Electro-magnetic acoustic transducers (EMAT) are successfully used in many NDE applications, despite their low efficiency: they do not require a coupling medium and can easily generate elastic waves that standard piezoelectric transducers cannot, such as shear horizontal guided waves. There are all sorts of EMAT designs, so much so that dedicated simulation tools are necessary to optimally conceive an EMAT for a given application. EMAT performances also strongly depend on material properties of the piece under test. Here, ferromagnetic materials are considered. In such a material, an EMAT is the source of three forces resulting from three distinct and generally nonlinear phenomena: in addition to the Lorentz's force generated in all conductive media, the magnetization and magnetostriction forces take place. All these forces are modelled as vector fields in the volume of the specimen. However, wave generation is more efficiently predicted by considering sources of surface stress than sources of body force. Thus, a general model is derived for transforming body forces into surface stresses; this approach is used to express the 2D modal amplitudes of Lamb waves generated by an EMAT in a ferromagnetic plate as quasi-closed form solutions.
Published: 2014
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42. Calculation of ultrasonic fields radiated in a ferromagnetic medium by an EMAT of arbitrary bias field driven by a current of arbitrary intensity

Author: Clémence Rouge, Alain Lhémery, H. Walaszek, C Aristégui, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut National de la Recherche Agronomique (INRA), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CEntre Technique des Industries Mécaniques (CETIM), CEntre Technique des Industries Mécaniques - Cetim (FRANCE), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: [PHYS]Physics [physics], 010302 applied physics, Physics, business.industry, Acoustics, Magnetostriction, 01 natural sciences, Magnetic field, symbols.namesake, Wavelength, Classical mechanics, Magnet, Nondestructive testing, 0103 physical sciences, symbols, Ultrasonic sensor, business, 010301 acoustics, Electromagnetic acoustic transducer, Lorentz force
Abstract: Conference of 40th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2013, Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics, ICBM 2013 ; Conference Date: 21 July 2013 Through 26 July 2013; Conference Code:105840; International audience; ElectroMagnetic Acoustic Transducers (EMATs) are contactless transducers generating ultrasonic waves in conductive media, notably shear horizontal and torsional waves (in plates and pipes, respectively), possibly in hostile environments. In a ferromagnetic part, the elastic strain and the magnetic field couple through magnetostriction phenomena, so that a magnetostriction and magnetization forces add up to the Lorentz force created in any conductive medium. Here, a model is proposed to predict these forces for an arbitrary bias field due to the EMAT permanent magnet and whatever the current intensity in its electric circuit, whereas the usual assumption of high bias field and low intensity current leads to important model simplifications. To handle the nonlinear behavior of all the three forces when the usual assumption cannot be made, forces are expressed in the time domain. In particular, magnetostriction force generates waves at several harmonic frequencies of the driving current frequency. Forces are then transformed into equivalent surface stresses readily usable as source terms in existing models of ultrasonic radiation, under the assumption that ultrasonic wavelengths are much longer than force penetration depths, (which is generally true in NDT applications of EMATs). Force spectra computed in various EMAT configurations are compared for illustration.
Published: 2014
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43. Multi-mode TFM imaging with artifacts filtering using CIVA UT forwards models

Author: Ekaterina Iakovleva, Philippe Brédif, Steve Mahaut, Sylvain Chatillon, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: [PHYS]Physics [physics], 010302 applied physics, Engineering, business.industry, Mode (statistics), Experimental data, Filter (signal processing), 01 natural sciences, Characterization (materials science), Transverse plane, Time of flight, Complex geometry, 0103 physical sciences, Ultrasonic sensor, business, 010301 acoustics, Algorithm, Simulation
Abstract: Conference of 40th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2013, Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics, ICBM 2013 ; Conference Date: 21 July 2013 Through 26 July 2013; Conference Code:105840; International audience; TFM (Total Focusing Method) is an advanced post-processing imaging algorithm of ultrasonic array data that shows great potential in defect detection and characterization. This technique can be performed using several propagation modes (direct or over skip imaging) and several types of waves (longitudinal or transverse) allowing the imaging of extended defects of complex geometry. However, non physical indications can be observed, leading to misinterpretation. These imaging artifacts are due to the coexistence of several contributions involving several mode of propagation and interactions with possible defects and / or the geometry of the part. In several configurations, a simple time of flight criterion is not sufficient for their identification. This paper presents tools based on the forward CIVA UT models which allow to analyze and to filter these artifacts, without any tuning parameters. The performances achieved are compared to those of conventional TFM on simulated and experimental data.
Published: 2014
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44. 2013 eddy current benchmark problem: Solution via a coupled integral approach

Author: Roberto Miorelli, Theodoros Theodoulidis, Christophe Reboud, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Department of Mechanical Engineering, University of Western Macedonia [Kozani] (UoWM), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: [PHYS]Physics [physics], 010302 applied physics, Physics, Work (thermodynamics), 01 natural sciences, Volume integral, law.invention, Control theory, law, Eddy-current testing, 0103 physical sciences, Benchmark (computing), Eddy current, Applied mathematics, Boundary element method, Problem solution
Abstract: Conference of 40th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2013, Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics, ICBM 2013 ; Conference Date: 21 July 2013 Through 26 July 2013; Conference Code:105840; International audience; This work proposes a solution to the 2013 eddy current testing benchmark, published by the WFNDEC. The simulated results have been obtained by employing a newly developed semi-analytical approach, based on the coupled use of the classical Volume Integral Method (VIM) and the Boundary Element Method (BEM). An analytical overview on the coupled VIM-BEM approach is first given, in order to explain its theoretical background. Then, the results obtained are discussed from the points of view of accuracy and efficiency, respectively.
Published: 2014
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45. Modelling of waves propagation on irregular surfaces using ray tracing and GTD approaches: Application to head waves simulation in TOFD inspections for NDT

Author: Marc Deschamps, Michel Darmon, Sylvain Chatillon, Adrien Ferrand, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), École Nationale Supérieure d'Arts et Métiers (ENSAM), and HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut National de la Recherche Agronomique (INRA)
Subjects: Diffraction, History, Engineering, Wave propagation, Seismic waves, Propagation modeling, 02 engineering and technology, 01 natural sciences, Seismic wave, Education, Time-of-flight diffraction technique, Ray-tracing technique, Optics, Time-of-flight diffraction ultrasonics, 0203 mechanical engineering, Nondestructive testing, 0103 physical sciences, Interfaces (materials), Precise positioning, Non destructive evaluation, Ultrasonic testing, 010302 applied physics, [PHYS]Physics [physics], business.industry, Elastic waves, Inspection, Ray tracing, Acoustics, Surface irregularities, Computer Science Applications, Nondestructive examination, Ultrasonic applications, Ray tracing (physics), Tracking (position), 020303 mechanical engineering & transports, Ultrasonic methods, Ultrasonic sensor, business, Geometrical theory of diffraction
Abstract: Conference of 12th Anglo-French Physical Acoustics Conference, AFPAC 2013 ; Conference Date: 16 January 2013 Through 18 January 2013; Conference Code:104840; International audience; The Time of Flight Diffraction (TOFD) technique is a classical ultrasonic method used in ultrasonic non-destructive evaluation, which allows a precise positioning and a quantitative size evaluation of cracks in the inspected material. Among the typical phenomena arising in the current TOFD inspection, the so-called «head wave» is the first contribution reaching the receiver. The head wave propagation on a planar interface is well known and identified as a critical refraction taking place on the material surface. On irregular surfaces, it has been shown that the head wave results from the melting of surface and bulk waves mechanisms and that surface irregularities are responsible for numerous diffractions of the incident head wave. To simulate such behaviour, a model has been developed using a ray tracing technique based on time of flight minimization (generalized Fermat's principle). It enables the calculation of the ray path and the corresponding time of flight of all waves propagating in the material, including the head wave. To obtain a complete propagation model for these waves (both trajectory and amplitude), the integration of Geometrical Theory of Diffraction (GTD) models is currently performed by coupling them with the ray-based approach discussed above.
Published: 2014
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46. Frequency spectra of magnetostrictive and Lorentz forces generated in ferromagnetic materials by a CW excited EMAT

Author: Clémence Rouge, Alain Lhémery, C Aristégui, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut National de la Recherche Agronomique (INRA), Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)
Subjects: Body force, History, Excitation frequency, Transduction process, Static magnetic fields, 01 natural sciences, Magnetostrictive forces, Education, Condensed Matter::Materials Science, Magnetization, symbols.namesake, Lorentz force, Magnetostrictive devices, 0103 physical sciences, Electromagnetic acoustic transducers, Inverse magnetostrictive effect, Discrete frequencies, Magnetic materials, 010301 acoustics, Electromagnetic acoustic transducer, Spectroscopy, 010302 applied physics, Physics, [PHYS]Physics [physics], Condensed matter physics, Magnetism, Magnetostriction, Magnetostatics, Computer Science Applications, Magnetic field, Dynamics, Classical mechanics, Magnetostrictive strain, Magnetic fields, symbols, Ferromagnetism, Ferromagnetic materials, Dynamic magnetic fields
Abstract: Conference of 12th Anglo-French Physical Acoustics Conference, AFPAC 2013 ; Conference Date: 16 January 2013 Through 18 January 2013; Conference Code:104840; International audience; Magnetostriction arises in ferromagnetic materials subjected to magnetization, e.g., when an EMAT (Electro-Magnetic Acoustic Transducer) is used to generate ultrasonic waves. In such a case, the magnetostriction force must be taken into account as a transduction process that adds up to the Lorentz force. When the static magnetic field is high compared to the dynamic field, both forces are driven by the excitation frequency. For lower static relative values of the magnetic fields, the Lorentz force comprises both the excitation frequency and its first harmonic. In this work, a model is derived to predict the frequency content of the magnetostrictive force that comprises several harmonics. The discrete frequency spectrum strongly depends on both the static field and the relative amplitude of the dynamic field. The only material input data needed to predict it is the curve of macroscopic magnetostrictive strain that can be measured in the direction of an imposed magnetic field. Then, the various frequency-dependent distributions of Lorentz and magnetostriction body forces can be transformed into equivalent surface stresses. Examples of computation are given for different static and dynamic magnetic fields to study their influence on the frequency content of waves generated in ferromagnetic materials.
Published: 2014
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47. Efficient FEM modeling of printed coils for eddy current testing

Author: L. Santandrea, H. Zaidi, Edouard Demaldent, Yann Le Bihan, Guillaume Krebs, Laboratoire Génie électrique et électronique de Paris (GeePs), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: 010302 applied physics, Materials science, 010401 analytical chemistry, Mechanical engineering, Condensed Matter Physics, 01 natural sciences, Finite element method, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, [SPI]Engineering Sciences [physics], Electromagnetic coil, Eddy-current testing, 0103 physical sciences, Instrumentation, Electrical conductor
Abstract: International audience; In this paper an approach for the modeling of the eddy current testing of a conductive part with flat printed coils is proposed. The overlapping finite element method is implemented for this purpose. It is shown that this approach allows simplifying the modeling of eddy current testing configurations that use this kind of coil.
Published: 2013
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48. Implementation of a GPU accelerated total focusing reconstruction method within CIVA software

Author: Lionel Lacassagne, Jason Lambert, Ekaterina Iakovleva, Gilles Rougeron, Nicolas Dominguez, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Recherche en Informatique (LRI), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Center for Nondestructive Evaluation, World Federation of NDE Centers, AIP, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))
Subjects: 010302 applied physics, Speedup, OpenCL, business.industry, Computer science, Total Focusing Method, GPU, CAD, Parallel computing, [INFO.INFO-NA]Computer Science [cs]/Numerical Analysis [cs.NA], 01 natural sciences, Reconstruction method, Computational science, Software, Planar, Full matrix, 0103 physical sciences, FMC, [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], business, 010301 acoustics
Abstract: International audience; This paper presents results of a TFM implementation for Full Matrix Capture acquisitions in CIVA, proposed as a post-processing tool for accurate analysis. This implementation has been made on GPU architecture with OpenCL to minimize the processing time and offer computational device flexibility (GPU/CPU). Examples on immersion configurations on isotropic 2D CAD specimen with planar extrusion are proposed to illustrate the performances. Reconstructions on 2D or 3D areas of direct echoes with mode conversion are allowed. Probe scanning can also be taken into account. Reconstruction results and a benchmark explaining the speedup are presented. Further improvements are also reviewed.
Published: 2013
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49. Real-time nondestructive testing of composite aeronautical structures with a self-adaptive ultrasonic technique

Author: S. Robert, O. Casula, G Neau, O. Roy, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, M2M, Les Ulis, and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: 010302 applied physics, [PHYS]Physics [physics], Iterative method, Computer science, business.industry, Applied Mathematics, Acoustics, Electrical engineering, 01 natural sciences, Domain (software engineering), Characterization (materials science), Transducer, Component (UML), Nondestructive testing, 0103 physical sciences, Ultrasonic sensor, business, 010301 acoustics, Instrumentation, Engineering (miscellaneous), Surface reconstruction
Abstract: International audience; In the aeronautical industry, composite structures under testing often have complex andvariable geometries. In such cases, an optimal use of ultrasonic transducer arrays requiresspecific algorithms in electronic systems in order to achieve rapid and reliable inspections. Tofulfil such requirements, a new real-time and adaptive technique is presented. The surfaceadaptive ultrasound (SAUL) technique is based on an iterative algorithm that does not requirea prior knowledge of the geometrical properties of the inspected domain. All different parts ofa given component can be controlled using the same transducer array, such as a conventionallinear array with a flat shape. In this paper, the adaptive processing is demonstrated throughacquisitions performed with different typical aircraft composite structures. In addition, wepresent a new surface reconstruction algorithm. This fast algorithm is efficient and can becoupled with the real-time adaptive processing to reconstruct SAUL images and, then, toimprove the characterization of flaws in composite materials.
Published: 2013
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50. A real-time implementation of the Total Focusing Method for rapid and precise diagnostic in non destructive evaluation

Author: Samir Bouaziz, Abdelhafid Elouardi, Olivier Roy, Mickael Njiki, Olivier Casula, Méthodes et Outils pour les Signaux et Systèmes (SATIE-MOSS), Systèmes d'Information et d'Analyse Multi-Echelles (SATIE-SIAME), Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS), Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, M2M-NDT, Systèmes d'Information et d'Analyse Multi-Echelles (SIAME), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École normale supérieure - Rennes (ENS Rennes)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS)-Systèmes et Applications des Technologies de l'Information et de l'Energie (SATIE), Université Paris-Seine-Université Paris-Seine-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST)
Subjects: 010302 applied physics, Hardware architecture, Pixel, business.industry, Phased array, Computer science, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Iterative reconstruction, Frame rate, 01 natural sciences, [SPI.TRON]Engineering Sciences [physics]/Electronics, [SPI]Engineering Sciences [physics], Nondestructive testing, Embedded system, 0103 physical sciences, business, Field-programmable gate array, 010301 acoustics, Image resolution, Computer hardware
Abstract: International audience; This paper describes a multi-FPGA architecture dedicated for the real-time imaging using the Total Focusing Method (TFM) and an advanced acquisition technique called the Full Matrix Capture (FMC). The maximum operating frequency is 147.3 MHz for the control blocks and 161.3 MHz for the acquisition blocks. The architecture is able to perform real-time image reconstruction at a maximum frame rate of 73 fps and a maximum resolution of 128 × 128 pixels, which is adequate as a performance for a real-time imaging system with a good characterization of defects.
Published: 2013
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