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
Year:
2010
Publisher:
The International Society for Optical Engineering
ISSN:
1996-756X
Keywords:
Note:
Invited Paper
Laboratories:




 Record created 2011-01-10, last modified 2018-03-18

Publisher's version:
Download fulltextPDF
External link:
Download fulltextURL
Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)