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Distributed fiber sparse-wideband vibration sensing by sub-Nyquist additive random sampling

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posted on 2023-11-30, 17:06 authored by Jingdong Zhang, Hua Zheng, Tao Zhu, Guolu Yin, Min Liu, Yongzhong Bai, Dingrong Qu, Feng Qiu, Xianbing Huang
The round trip time of the light pulse limits the maximum detectable vibration frequency response range of phase-sensitive optical time domain reflectometry ({\phi}-OTDR). Unlike the uniform laser pulse interval in conventional {\phi}-OTDR, we randomly modulate the pulse interval, so that an equivalent sub-Nyquist additive random sampling (sNARS) is realized for every sensing point of the long interrogation fiber. For an {\phi}-OTDR system with 10 km sensing length, the sNARS method is optimized by theoretical analysis and Monte Carlo simulation, and the experimental results verify that a wide-band spars signal can be identified and reconstructed. Such a method can broaden the vibration frequency response range of {\phi}-OTDR, which is of great significance in sparse-wideband-frequency vibration signal detection, such as rail track monitoring and metal defect detection.

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