Breaking through the bandwidth barrier in distributed fiber vibration sensing by sub-Nyquist randomized sampling

Jingdong Zhang; Tao Zhu; Hua Zheng; Yang Kuang; Min Liu; Wei Huang

doi:10.1117/12.2265657

23 April 2017 Breaking through the bandwidth barrier in distributed fiber vibration sensing by sub-Nyquist randomized sampling

Jingdong Zhang, Tao Zhu, Hua Zheng, Yang Kuang, Min Liu, Wei Huang

Author Affiliations +

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103238H (2017) https://doi.org/10.1117/12.2265657
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

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.

Citation Download Citation

Jingdong Zhang, Tao Zhu, Hua Zheng, Yang Kuang, Min Liu, and Wei Huang "Breaking through the bandwidth barrier in distributed fiber vibration sensing by sub-Nyquist randomized sampling", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103238H (23 April 2017); https://doi.org/10.1117/12.2265657

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