23 April 2017 Breaking through the bandwidth barrier in distributed fiber vibration sensing by sub-Nyquist randomized sampling
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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.
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Jingdong Zhang, Jingdong Zhang, Tao Zhu, Tao Zhu, Hua Zheng, Hua Zheng, Yang Kuang, Yang Kuang, Min Liu, Min Liu, Wei Huang, 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); doi: 10.1117/12.2265657; https://doi.org/10.1117/12.2265657
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