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Proceedings Paper

Eliminating the non-local effect in frequency-fixed probe wave based BOTDA sensor
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Paper Abstract

The robustness of the BOTDA method based on dual-tone probe wave with fixed frequency separation is studied. It is verified that when the sensing fiber consists of two fiber segments with large Brillouin frequency shift difference (>100 MHz), the non-local effect would take place in the front fiber segment, which gives rise to frequency error on the determination of hotspot. Aiming at solving this problem, both the upper and lower probe sidebands are acquired simultaneously by using two photodiodes, and the average between the Brillouin gain and loss spectrum is calculated to eliminate the detrimental impact of the non-local effect.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 1032398 (23 April 2017); doi: 10.1117/12.2267527
Show Author Affiliations
Sheng Wang, Beijing Univ. of Posts and Telecommunications (China)
Zhisheng Yang, Beijing Univ. of Posts and Telecommunications (China)
Xiaobin Hong, Beijing Univ. of Posts and Telecommunications (China)
Wenqiao Lin, Beijing Univ. of Posts and Telecommunications (China)
Jian Wu, Beijing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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