Open AccessDistributed optical fiber hydrophone based on Φ-OTDR and its field test
Author(s) -
Bin Lu,
Baoshan Wu,
Jinfeng Gu,
Junqi Yang,
Kan Gao,
Zhaoyong Wang,
Lei Ye,
Qing Ye,
Ronghui Qu,
Xiaobao Chen,
Haiwen Cai
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.414598
Subject(s) - optical time domain reflectometer , hydrophone , optics , distributed acoustic sensing , optical fiber , acoustics , reflectometry , fiber optic sensor , computer science , physics , polarization maintaining optical fiber , time domain , computer vision
In this letter, a distributed optical fiber hydrophone (DOFH) based on Φ-OTDR is demonstrated and tested in the field. The specially designed sensitized optical cable with sensitivity up to -146 dB rad/µPa/m is introduced, and an array signal processing model for DOFH is constructed to analyze the equivalence and specificity of the distributed array of acoustic sensors. In the field test, a 104-meter-long optical cable and a Φ-OTDR system based on heterodyne coherent detection (Het Φ-OTDR) is utilized, and underwater acoustic signal spatial spectrum estimation, beamforming and motion trajectory tracking with high accuracy can be realized. As far as we know, this is the first report on the field trial of DOFH based on Φ-OTDR. The DOFH has the potential to achieve an array range of tens of kilometers, with elements spaced up to the meter level and flexible configuration, which has a broad application prospect for marine acoustic detection.