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

被引：35

作者：

Zhang, Jingdong ^{[1
]}

Zheng, Hua ^{[1
]}

Zhu, Tao ^{[1
]}

Yin, Guolu ^{[1
]}

Liu, Min ^{[1
]}

Bai, Yongzhong ^{[2
]}

Qu, Dingrong ^{[2
]}

Qiu, Feng ^{[2
]}

Huang, Xianbing ^{[2
]}

机构：

[1] Chongqing Univ, Minist Educ, Key Lab Optoelect Technol & Syst, Chongqing 400044, Peoples R China

[2] SINOPEC Res Inst Safety Engn, State Key Lab Safety & Control Chem, Qingdao 266000, Peoples R China

来源：

OPTICS LETTERS | 2018年 / 43卷 / 09期

基金：

中国国家自然科学基金;

关键词：

PHASE-SENSITIVE OTDR; FREQUENCY-RESPONSE;

D O I：

10.1364/OL.43.002022

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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 a 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 wideband sparse 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. (C) 2018 Optical Society of America.

引用

页码：2022 / 2025

页数：4