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Proceedings Paper

Recent progress towards centimetric spatial resolution in distributed fibre sensing
Author(s): Luc Thévenaz; Stella Foaleng-Mafang; Kwang-Yong Song; Sanghoon Chin; Jean-Charles Beugnot; Nikolay Primerov; Moshe Tur
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Paper Abstract

Optical fibre sensors based on stimulated Brillouin scattering have now clearly demonstrated their excellent capability for long-range distributed strain and temperature measurements. The fibre is used as sensing element and a value for temperature and/or strain can be obtained from any point along the fibre. While classical configurations have practically a spatial resolution limited by the phonon lifetime to 1 meter, novel approaches have been demonstrated these past years that can overcome this limit. This can be achieved either by the prior activation of the acoustic wave by a long lasting pre-pumping signal, leading to the optimized configuration using Brillouin echoes, or by probing a classically generated steady acoustic wave using a ultra-short pulse propagating in the orthogonal polarization of a highly birefringent fibre. These novel configurations can offer spatial resolutions in the centimetre range, while preserving the full accuracy on the determination of temperature and strain.

Paper Details

Date Published: 9 September 2010
PDF: 7 pages
Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 765309 (9 September 2010); doi: 10.1117/12.868432
Show Author Affiliations
Luc Thévenaz, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Stella Foaleng-Mafang, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Kwang-Yong Song, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Sanghoon Chin, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Jean-Charles Beugnot, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Nikolay Primerov, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Moshe Tur, Ecole Polytechnique Fédérale de Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 7653:
Fourth European Workshop on Optical Fibre Sensors
José Luís Santos; Brian Culshaw; José Miguel López-Higuera; William N. MacPherson, Editor(s)

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