5 results on '"Quantitative measurements"'
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2. Recent Advances in Microelectromechanical Systems and Their Applications for Future Challenges
- Author
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Pryputniewicz, Ryszard J., Kounadis, Anthony N., editor, and Gdoutos, Emmanuel E., editor
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- 2011
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3. Reliable and Rapid Robotic Assessment of Wrist Proprioception Using a Gauge Position Matching Paradigm.
- Author
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Rinderknecht, Mike D., Popp, Werner L., Lambercy, Olivier, Gassert, Roger, Boisgontier, Matthieu P., and Herter, Troy Michael
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SOMATOSENSORY disorders ,PROPRIOCEPTION ,MEDICAL robotics ,MEDICAL errors ,DIAGNOSIS ,THERAPEUTICS - Abstract
Quantitative assessments of position sense are essential for the investigation of proprioception, as well as for diagnosis, prognosis and treatment planning for patients with somatosensory deficits. Despite the development and use of various paradigms and robotic tools, their clinimetric properties are often poorly evaluated and reported. A proper evaluation of the latter is essential to compare results between different studies and to identify the influence of possible confounds on outcome measures. The aim of the present study was to perform a comprehensive evaluation of a rapid robotic assessment of wrist proprioception using a passive gauge position matching task. Thirty-two healthy subjects undertook six test-retests of proprioception of the right wrist on two different days. The constant error (CE) was 0.87?, the absolute error (AE) was 5.87°, the variable error (VE) was 4.59° and the total variability (E) was 6.83° in average for the angles presented in the range from 10° to 30°. The intraclass correlation analysis provided an excellent reliability for CE (0.75), good reliability for AE (0.68) and E (0.68), and fair reliability for VE (0.54). Tripling the assessment length had negligible effects on the reliabilities. Additional analysis revealed significant trends of larger overestimation (constant errors), as well as larger absolute and variable errors with increased flexion angles. No proprioceptive learning occurred, despite increased familiarity with the task, which was reflected in significantly decreased assessment duration by 30%. In conclusion, the proposed automated assessment can provide sensitive and reliable information on proprioceptive function of the wrist with an administration time of around 2.5 min, demonstrating the potential for its application in research or clinical settings. Moreover, this study highlights the importance of reporting the complete set of errors (CE, AE, VE, and E) in a matching experiment for the identification of trends and subsequent interpretation of results. [ABSTRACT FROM AUTHOR]
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- 2016
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4. Advances in phase measurement methodology for MOEMS testing.
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Pryputniewicz, Ryszard J.
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OPTICAL MEMS , *LASER interferometry , *OPTICAL measurements , *METHODOLOGY , *DEFORMATIONS (Mechanics) - Abstract
Advances in emerging technologies of microelectromechanical systems (MEMS) in general and micro-opto-electro-mechanical systems (MOEMS) in particular are some of the most challenging tasks in today's experimental mechanics. More specifically, development of these miniature devices requires sophisticated design, analysis, fabrication, testing, and characterization tools that have multiphysics and multiscale capabilities. One of the approaches employed in the development of microsystems of current interest is based on hybridization of the analytical, computational, and experimental solutions. In particular, the experimental solutions are relying on recent advances of the optoelectronic laser interferometric microscope (OELIM) methodology based on phase measurements. This hybrid approach is applicable under static and dynamic conditions and, as such, facilitates measurements of dynamic and thermomechanical behavior of the individual components, their packages, and other complex material structures. In this paper, the phase measurement methodology is described and its applicability is illustrated by use of representative micro-samples with emphasis on MOEMS. Shape, deformations, and motions of these samples are measured quantitatively in near real-time. Preliminary theoretical results correlate with the experimental results well within the criteria governed by the uncertainty analysis. Validated correlations will lead to establishment of 'design by analysis' methodology for efficient and effective development of structures, which is becoming more and more necessary especially for the satisfaction of microsystem reliability assessment (MRA) requirements. All in all, representative results presented in this paper indicate that the phase measurement methodology is a viable tool for micro-scale measurements and, as such, it is particularly useful for development of microsystems. [ABSTRACT FROM AUTHOR]
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- 2010
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5. Microscopic TV holography for MEMS deflection and 3-D surface profile characterization
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N. Krishna Mohan, Basanta Bhaduri, Anand Asundi, Mahendra P. Kothiyal, and U. Paul Kumar
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Microelectromechanical systems ,Materials science ,Microscope ,business.industry ,Mechanical Engineering ,Asphalt pavements ,Composite micromechanics ,Computer networks ,Conformal mapping ,Curve fitting ,Data recording ,Electrochemical sensors ,Holographic interferometry ,Industrial management ,Interferometry ,Laser recording ,Maps ,Measurements ,MEMS ,Microelectromechanical devices ,Optics ,Photonics ,Quality assurance ,Real time systems ,Reliability ,Speckle ,Spectroscopic analysis ,Surface properties ,Surfaces ,Trace elements ,Deflection (ovalization) ,Elsevier (CO) ,Experimental results ,Holographic systems ,Industrial demands ,MEMS industry ,Micro electro mechanical systems (MEMS) ,Microelements ,Noisy phase maps ,Non destructive ,Out-of-plane deflection ,Phase-shifting algorithms ,product qualities ,Quantitative measurements ,Smooth surfaces ,speckle interferometry ,Surface profile analysis ,Surface profiling ,TV holography ,Working distance (WD) ,Wrapped phase map ,Surface analysis ,Holography ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Metrology ,law.invention ,Speckle pattern ,law ,Speckle imaging ,Profilometer ,Electrical and Electronic Engineering ,business - Abstract
Recent industrial demands for greater product quality in the fields of microelements and micro-electro-mechanical systems (MEMS) generate new challenges for metrology. The fast-growing MEMS industry requires a robust non-destructive quantitative measurement system for the characterization of their performance, reliability and integrity. A microscopic TV holographic system using a long working distance microscope with an extended zoom range has been developed for microelements and MEMS deformation and 3-D surface profile analysis. The system is capable of evaluating both rough and smooth surfaces. Noisy wrapped phase map is a usual problem in speckle interferometry. We have compared several phase-shifting algorithms for evaluation of speckle phase for their usefulness in generating less-noisy phase maps. The experimental results on a MEMS pressure sensor for out-of-plane deflection and 3-D surface profile analysis are presented. � 2008 Elsevier Ltd. All rights reserved.
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- 2008
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