Recent progress towards centimetric spatial resolution in distributed fibre sensing

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.

Published in:
Proc. SPIE, 7653, 765309
Presented at:
Fourth European Workshop on Optical Fibre Sensors, Porto, Portugal, September 8, 2010
The International Society for Optical Engineering
Invited Paper

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 Record created 2011-01-10, last modified 2019-12-05

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