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85 results on '"Lochmann, Steffen"'

1. Evaluation of a CDM Interrogation Scheme Allowing Spectrally Overlapping FBG Sensors

Author

Götten, Marek, Lochmann, Steffen, Ahrens, Andreas, Benavente-Peces, César, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Ahrens, Andreas, editor, Prasad, RangaRao Venkatesha, editor, Benavente-Peces, César, editor, and Ansari, Nirwan, editor

Published
2022
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2. Optical MIMO Transmission Focusing on Photonic Lanterns and Optical Couplers

Author

Ahrens, Andreas, Sandmann, André, Lochmann, Steffen, Barbosa, Simone Diniz Junqueira, Series Editor, Filipe, Joaquim, Series Editor, Kotenko, Igor, Series Editor, Sivalingam, Krishna M., Series Editor, Washio, Takashi, Series Editor, Yuan, Junsong, Series Editor, Zhou, Lizhu, Series Editor, Ghosh, Ashish, Series Editor, Obaidat, Mohammad S., editor, and Cabello, Enrique, editor

Published
2019
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4. A fibre optic sensor for the in situ determination of rock physical properties

Author

Reinsch, Thomas, Blöcher, Guido, Milsch, Harald, Bremer, Kort, Lewis, Elfed, Leen, Gabriel, and Lochmann, Steffen

Subjects
Physics - Geophysics, Physics - Optics
Abstract

To understand the behaviour of rocks under changing load or temperature conditions, the determination of physical parameters like pore pressure or temperature within the pore space is essential. Within this study, the implementation of a novel fibre optic point sensor for pressure and temperature determination into a high pressure / high temperature triaxial cell is presented. For the first time, pressure was measured directly within the pore space of a Flechtinger sandstone specimen during a hydrostatic compression test at up to 70 MPa. The sensor used within this study consists of a miniature all-silica fibre optic Extrinsic Fabry-Perot Interferometer (EFPI) sensor which has an embedded Fibre Bragg Grating (FBG) reference sensor element to determine temperature and pressure directly at the point of measurement.

Published
2012
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5. Mode Excitation and Multiplexing for MIMO Systems Focusing on Digital Mirror Devices

Author

Sandmann, André, Ahrens, Andreas, Lochmann, Steffen, Bartmann, Peter, Barbosa, Simone Diniz Junqueira, Series editor, Chen, Phoebe, Series editor, Filipe, Joaquim, Series editor, Kotenko, Igor, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Yuan, Junsong, Series editor, Zhou, Lizhu, Series editor, and Obaidat, Mohammad S., editor

Published
2017
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7. Zero-Forcing Equalisation of Measured Optical Multimode MIMO Channels

Author

Sandmann, André, Ahrens, Andreas, Lochmann, Steffen, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Liu, Ting, Series editor, Kotenko, Igor, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Obaidat, Mohammad S., editor, and Holzinger, Andreas, editor

Published
2015
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13. Monitoring of Environmentally Hazardous Exhaust Emissions from Cars Using Optical Fibre Sensors

Author

Lewis, Elfed, Clifford, John, Fitzpatrick, Colin, Dooly, Gerard, Zhao, Weizhong, Sun, Tong, Grattan, Ken, Lucas, James, Degner, Martin, Ewald, Hartmut, Lochmann, Steffen, Bramann, Gero, Merlone-Borla, Edoardo, Gili, Flavio, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Bereković, Mladen, editor, Dimopoulos, Nikitas, editor, and Wong, Stephan, editor

Published
2008
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42. Optical fibre sensors based on multi-mode fibres and MIMO signal processing: An experimental approach

Author

Ahrens, Andreas, Sandmann, Andre, Bremer, Kort, Roth, Bernhard, Lochmann, Steffen, Ahrens, Andreas, Sandmann, Andre, Bremer, Kort, Roth, Bernhard, and Lochmann, Steffen

Abstract

In this paper multiple-input multiple-output (MIMO) signal processing is investigated for fibre optic sensor applications. A (2 × 2) MIMO implementation is realized by using lower-order and higher-order mode groups of a graded-index (GI) multi-mode fibre (MMF) as separate transmission channels. A micro-bending pressure sensor changes these separate transmission characteristics and introduces additional crosstalk. By observing the weight-factors of the MIMO system the amount of load applied was determined. Experiments verified a good correlation between the change of the MIMO weight coefficients and the load applied to the sensor and thus verified that MIMO signal processing can beneficially be used for fibre optic sensor applications. © 2015 SPIE.

Published
2015

43. Fabrication of miniature all-glass fibre optic pressure and temperature sensor

Author

Bremer, Kort, Lewis, Elfed, Leen, Gabriel, Moss, B, Lochmann, Steffen, Mueller, I, IRC, and SFI

Subjects
FPG, EFPI, pressure, temperature
Abstract

peer-reviewed In this paper the fabrication of a miniature all-glass fibre optic pressure and temperature sensor is presented. The sensor combines the functionality of a miniature all-silica diaphragm based Extrinsic Fabry Perot Interferometric (EFPI) Fibre Optic Pressure Sensor (FOPS) and an in-Fibre Bragg Grating (FBG) sensor. The reported fibre optic sensor has several advantages such as being cost-effective, simple to fabricate, miniature in size, mechanically robust and can be designed to withstand high temperatures or/and pressures. PUBLISHED peer-reviewed

Published
2011

48. Monitoring of Environmentally Hazardous Exhaust Emissions from Cars Using Optical Fibre Sensors

Author

Lewis, Elfed, primary, Clifford, John, additional, Fitzpatrick, Colin, additional, Dooly, Gerard, additional, Zhao, Weizhong, additional, Sun, Tong, additional, Grattan, Ken, additional, Lucas, James, additional, Degner, Martin, additional, Ewald, Hartmut, additional, Lochmann, Steffen, additional, Bramann, Gero, additional, Merlone-Borla, Edoardo, additional, and Gili, Flavio, additional

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