23 May 2005 Distributed fiber Brillouin strain and temperature sensor with centimeter spatial resolution by coherent probe-pump technique
Author Affiliations +
Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623430
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium
Abstract
We present a sensing principle of the distributed fiber Brillouin strain and temperature sensor by coherent probe-pump technique that offers a new method to achieve centimeter spatial resolution with high frequency resolution. A combination of continuous wave (cw) and pulse source as the probe (Stokes) beam and cw laser as the pump beam have resulted in stronger Brillouin interaction of Stokes and pump inside the pulse-length in the form of cw-pump and pulse-pump interactions. We find that the coherent portion inside the pulse-length of these two interactions due to the same phase has a very high Brillouin amplification. The Brillouin profile originating from the coherent interaction of pulse-pump with cw-pump results in high temperature and strain accuracy with centimeter resolution, which has been verified by successfully detecting 1.5 cm out-layer crack on an optical ground wire (OPGW) cable.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lufan Zou, Xiaoyi Bao, Yidun Wan, Fabien Ravet, Liang Chen, "Distributed fiber Brillouin strain and temperature sensor with centimeter spatial resolution by coherent probe-pump technique", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); doi: 10.1117/12.623430; https://doi.org/10.1117/12.623430
PROCEEDINGS
4 PAGES


SHARE
Back to Top