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16 October 2023 Ultra-fine cable fiber optic hydrophone array for acoustic detection
Su Wu, Junbin Huang, Hongcan Gu, Yandong Pang, Wen Liu
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Proceedings Volume 12792, Eighteenth National Conference on Laser Technology and Optoelectronics; 127920K (2023) https://doi.org/10.1117/12.2689054
Event: Eighteenth National Conference on Laser Technology and Optoelectronics, 2023, Shanghai, China
Abstract
We demonstrate an ultra-fine fiber optic hydrophone array for acoustic detection. It is consisted of Weak Reflection Fiber Bragg Grating (WFBG), including four layers: optical fiber layer, coating layer, tensile layer, and sealing layer. Moreover, an hydroacoustic detection system which based on matched interference is established. The responses of underwater acoustic signals, generated by vibration liquid column, in the areas of amplitude, phase and frequency were demodulated simultaneously using the combining algorithm of digital arc tangent and PGC algorithm. A relative flatness response of 3dB was achieved in the frequency range from 200 to 2000 Hz. And the experiments showed that acoustic pressure sensitivity is about -147.96 dB (re 1rad/μPa).
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Su Wu, Junbin Huang, Hongcan Gu, Yandong Pang, and Wen Liu "Ultra-fine cable fiber optic hydrophone array for acoustic detection", Proc. SPIE 12792, Eighteenth National Conference on Laser Technology and Optoelectronics, 127920K (16 October 2023); https://doi.org/10.1117/12.2689054
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KEYWORDS
Acoustics
Demodulation
Fiber optics
Optical fiber cables
Signal detection
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