Distributed fiber-optic vibration sensing based on phase extraction from time-gated digital OFDR

Optics Express
Shuai WangZuyuan He

Abstract

A novel distributed fiber vibration sensing technique based on phase extraction from time-gated digital optical frequency domain reflectometry (TGD-OFDR) which can achieve quantitative vibration measurement with high spatial resolution and long measurement range is proposed. A 90 degree optical hybrid is used to extract phase information. By increasing frequency sweeping speed, the influence of environmental phase disturbance on TGD-OFDR is mitigated significantly, which makes phase extraction in our new scheme more reliable than that in conventional OFDR-based method, leading to the realization of long distance quantitative vibration measurement. By using the proposed technique, a distributed vibration sensor that has a measurement range of 40 km, a spatial resolution of 3.5 m, a measurable vibration frequency up to 600 Hz, and a minimal measurable vibration acceleration of 0.08g is demonstrated.

Citations

Jul 30, 2016·Sensors·Xin LiuYuncai Wang
Nov 3, 2017·Optics Express·Jiong LiZhongmin Yang
Apr 16, 2019·Optics Letters·Mengshi ZhuHideaki Murayama
Apr 2, 2019·Optics Letters·Liang JiajingCai Haiwen
Jun 12, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Hyeong-Min KimSeung-Ki Lee
Sep 11, 2021·Scientific Reports·Hannah M OgdenBrandon Redding

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