DocumentCode :
1469676
Title :
Sub-Centimeter Spatial Resolution in Distributed Fiber Sensing Based on Dynamic Brillouin Grating in Optical Fibers
Author :
Chin, Sanghoon ; Primerov, Nikolay ; Thévenaz, Luc
Author_Institution :
Inst. of Electr. Eng., EPFL Swiss Fed. Inst. of Technol., Lausanne, Switzerland
Volume :
12
Issue :
1
fYear :
2012
Firstpage :
189
Lastpage :
194
Abstract :
Optical fiber sensors based on stimulated Brillouin scattering in optical fibers have now clearly demonstrated their excellent capability for long-range distributed strain and temperature measurements. The fiber is used as sensing element and a value for temperature and/or strain can be obtained from any point along the fiber. While the spatial resolution of classical configurations is practically limited to 1 meter by the phonon lifetime, novel approaches have been demonstrated these past years that can overcome this limit. In this paper, this could be achieved by two physical processes: prior activation of a steady acoustic wave through the classical Brillouin interaction between two Brillouin pumps, and interrogation by Bragg reflection on the acoustic wave using a distinct ultra-short pulse in a highly birefringent fiber. We could achieve a spatial resolution below one centimeter, while preserving the full accuracy on the determination of temperature and strain.
Keywords :
distributed sensors; fibre optic sensors; stimulated Brillouin scattering; distributed fiber sensing; dynamic Brillouin grating; optical fiber sensors; steady acoustic wave; stimulated Brillouin scattering; sub-centimeter spatial resolution; Gratings; Optical fiber polarization; Optical fiber sensors; Scattering; Spatial resolution; Distributed fiber sensor; fiber optics; nonlinear optics; optical fiber sensor; stimulated Brillouin scattering;
fLanguage :
English
Journal_Title :
Sensors Journal, IEEE
Publisher :
ieee
ISSN :
1530-437X
Type :
jour
DOI :
10.1109/JSEN.2011.2126568
Filename :
5729309
Link To Document :
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