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Proceedings Paper

Distributed vibration sensing based on time-difference pulses
Author(s): Qian He; Tao Zhu; Xianghui Xiao; Xiaoyi Bao
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Paper Abstract

An optical fiber distributed sensing system merged Mach-Zehnder interferometer (MZI) and phase-sensitive optical time domain reflectometer (φ-OTDR) for vibration measurement with wide frequency response and spatial resolution is proposed and demonstrated. Two acoustic optical modulators (AOM) are adopted to generate narrow pulses and wide pulses respectively on both ends of sensing fiber with a time difference. Narrow pulses are used to generate Rayleigh backscattering light, which locates the vibration point, while wide pulses interfere with reference light as a MZI to obtain frequency response. To simulate the high frequency responses of crack in civil structures, the sudden break of pencils adjacent to fiber loop has been measured. The experimental results show 5 m spatial resolution and up to 6.3 MHz frequency response with 50 ns pulse width are achieved in 1150 m sensing distance.

Paper Details

Date Published: 15 October 2013
PDF: 4 pages
Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 89241M (15 October 2013); doi: 10.1117/12.2034185
Show Author Affiliations
Qian He, Chongqing Univ. (China)
Tao Zhu, Chongqing Univ. (China)
Xianghui Xiao, Chongqing Univ. (China)
Xiaoyi Bao, Univ. of Ottawa (Canada)

Published in SPIE Proceedings Vol. 8924:
Fourth Asia Pacific Optical Sensors Conference
Minghong Yang; Dongning Wang; Yun-Jiang Rao, Editor(s)

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