Quantitative demodulation of distributed low-frequency vibration based on phase-shifted dual-pulse phase-sensitive OTDR with direct detection

Author:

Liu Shuaiqi12ORCID,Shao Liyang13ORCID,Yu Fei-Hong1ORCID,Xu Weijie1,Vai Mang I.2,Xiao Dongrui1ORCID,Lin Weihao12,Hu Jie1,Zhao Fang1,Wang Guoqing14,Wang Weizhi3,Liu Huanhuan1,Shum Perry P.1,Wang Feng5ORCID

Affiliation:

1. Southern University of Science and Technology

2. University of Macau

3. Peng Cheng Laboratory

4. Shenzhen Institute of Information Technology

5. Nanjing University

Abstract

Phase-sensitive optical time-domain reflectometry (Φ-OTDR) has been proposed for distributed vibration sensing purpose over recent years. Emerging applications, including seismic and hydroacoustic wave detection, demand accurate low-frequency vibration reconstruction capability. We propose to use the direct-detection Φ-OTDR configuration to achieve quantitative demodulation of external low-frequency vibrations by phase-shifted dual-pulse probes. Simultaneous pulsing and phase shifting modulation is realized with a single acousto-optic modulator to generate such probes, relaxing the need for an additional optical phase modulator. In the experiments, vibrations with frequency as low as 0.5 Hz are successfully reconstructed with 10 m spatial resolution and 35 dB signal-to-noise ratio. Excellent linearity and repeatability are demonstrated between the optical phase demodulation results and the applied vibration amplitudes. The proposed method is capable of quantitative demodulation of low-frequency vibrations with a cost-effective system configuration and high computation efficiency, showing potential for commercial applications of distributed seismic or hydroacoustic wave acquisition.

Funder

Future Greater-Bay Area Network Facilities for Large-scale Experiments and Applications

The Verification Platform of Multi-tier Coverage Communication Network for Oceans

Guangdong Department of Science and Technology

Guangdong Department of Education

Shenzhen Science, Technology & Innovation Commission

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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