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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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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cited_by cdi_FETCH-LOGICAL-c319t-a203f8200eb2a0ac0bab727bab4f06060a31fa346c3ec4a21da91faa9c6b4bb3
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container_end_page 2025
container_issue 9
container_start_page 2022
container_title Optics letters
container_volume 43
creator Zhang, Jingdong
Zheng, Hua
Zhu, Tao
Yin, Guolu
Liu, Min
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Qu, Dingrong
Qiu, Feng
Huang, Xianbing
description 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.
doi_str_mv 10.1364/OL.43.002022
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subjects Broadband
Computer simulation
Detection
Frequency response
Interrogation
Monte Carlo simulation
Random sampling
Reflectometry
Signal detection
Vibration
title Distributed fiber sparse-wideband vibration sensing by sub-Nyquist additive random sampling
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