Research on Distributed Optical Fiber Acoustic Sensing Technology for Hydroacoustic Demodulation

In this paper, the principle of distributed optical fiber acoustic sensing (DAS) technology is briefly described, and the experiment of hydroacoustic signal demodulation and restoration by DAS technology is designed. It is verified that DAS technology can realize the linear and distortionless restoration of hydroacoustic signal at different frequencies and amplitudes. The calibration experiment is also designed to measure the acoustic pressure sensitivity, which shows that the acoustic pressure sensitivity of the system reaches-139.7dB. The results show that the DAS technology has a strong practical application effect and broad application prospects in the field of underwater acoustic signal monitoring.