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Breaking through the bandwidth barrier in distributed fiber vibration sensing by sub-Nyquist randomized sampling
Author(s): Jingdong Zhang; Tao Zhu; Hua Zheng; Yang Kuang; Min Liu; Wei Huang
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Paper Abstract

The round trip time of the light pulse limits the maximum detectable frequency response range of vibration in phase-sensitive optical time domain reflectometry (φ-OTDR). We propose a method to break the frequency response range restriction of φ-OTDR system by modulating the light pulse interval randomly which enables a random sampling for every vibration point in a long sensing fiber. This sub-Nyquist randomized sampling method is suits for detecting sparse-wideband- frequency vibration signals. Up to MHz resonance vibration signal with over dozens of frequency components and 1.153MHz single frequency vibration signal are clearly identified for a sensing range of 9.6km with 10kHz maximum sampling rate.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103238H (23 April 2017); doi: 10.1117/12.2265657
Show Author Affiliations
Jingdong Zhang, Chongqing Univ. (China)
Tao Zhu, Chongqing Univ. (China)
Hua Zheng, Chongqing Univ. (China)
Yang Kuang, Chongqing Univ. (China)
Min Liu, Chongqing Univ. (China)
Wei Huang, Chongqing Univ. (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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