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

The round-trip time of the light pulse limits the maximum detectable vibration frequency response range of phase-sensitive optical time domain reflectometry (ϕ-OTDR). Unlike the uniform laser pulse interval in conventional ϕ-OTDR, we randomly modulate the pulse interval so that an equivalent sub-Nyq...

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Bibliographic Details
Published in:Optics letters 2018-05, Vol.43 (9), p.2022-2025
Main Authors: Zhang, Jingdong, Zheng, Hua, Zhu, Tao, Yin, Guolu, Liu, Min, Bai, Yongzhong, Qu, Dingrong, Qiu, Feng, Huang, Xianbing
Format: Article
Language:English
Subjects:
Broadband
Computer simulation
Detection
Frequency response
Interrogation
Monte Carlo simulation
Random sampling
Reflectometry
Signal detection
Vibration
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Summary:The round-trip time of the light pulse limits the maximum detectable vibration frequency response range of phase-sensitive optical time domain reflectometry (ϕ-OTDR). Unlike the uniform laser pulse interval in conventional ϕ-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 a ϕ-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 wideband sparse signal can be identified and reconstructed. Such a method can broaden the vibration frequency response range of ϕ-OTDR, which is of great significance in sparse-wideband-frequency vibration signal detection.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.43.002022