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Three-component homovibrational vector hydrophone based on fiber Bragg grating F-P interferometry
Applied Optics
|November 22, 2018
Summary
This study presents a novel fiber optic vector hydrophone using fiber Bragg gratings (FBGs). The developed hydrophone offers miniaturization, reliability, and low cost, with improved cross-talk suppression and an extended working band.
Area of Science:
- Photonics and Sensor Technology
- Acoustic Measurement Systems
Background:
- Fiber optic sensors offer advantages like miniaturization and reliability.
- Fiber Bragg gratings (FBGs) are key components in advanced optical sensing.
- Fabry-Perot interferometry enables sensitive optical measurements.
Purpose of the Study:
- To develop and validate a fiber optic vector hydrophone using FBG-based Fabry-Perot interferometry.
- To investigate interferometric vector sensing, multiplexing design, and cross-talk suppression.
- To achieve a compact, reliable, and cost-effective vector hydrophone solution.
Main Methods:
- Utilized fiber Bragg gratings (FBGs) as reflection units in a Fabry-Perot interferometric configuration.
- Employed low-reflectivity FBGs (1% reflectivity) to reduce channel cross-talk.
- Developed and tested a three-component homovibrational vector hydrophone.
Main Results:
- Achieved an average cross-talk reduction of 20 dB compared to high-reflectivity gratings.
- Extended the working frequency band of the hydrophone down to 20 Hz.
- Demonstrated a sensitivity of approximately -132.5 dB at 500 Hz and a directivity index exceeding 30 dB at 100 Hz.
Conclusions:
- The FBG-based Fabry-Perot interferometric vector hydrophone is a viable technology.
- Low-reflectivity FBGs are effective in suppressing cross-talk in multiplexed systems.
- The developed hydrophone meets key performance metrics for various applications.
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