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12 December 2018 Optical fiber hydrophone based on distributed acoustic sensing
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Proceedings Volume 10849, Fiber Optic Sensing and Optical Communication; 108490B (2018)
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China
Based on the principle of phi-sensitive optical time domain reflectometry (φ-OTDR), the distributed optical fiber acoustic sensing (DAS) system can detect long distance and real-time acoustic signal by demodulating the phase change of backward Rayleigh scattering in the single mode fiber. Low sensitivity of single-mode fiber limits the underwater acoustic signal detection. In this paper, we design an elastic sensitizing layer base element encapsulation structure, and establish a theoretical analysis model. The theoretical analysis and experiment are carried out, the sensitivity of the acoustic pressure sensitivity of the elastic sensitizing layer structure is -141.6dB re 1rad/μPa, which is in good agreement with the theory.
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Yang Yang, Tuanwei Xu, Shengwen Feng, Jianfen Huang, and Fang Li "Optical fiber hydrophone based on distributed acoustic sensing", Proc. SPIE 10849, Fiber Optic Sensing and Optical Communication, 108490B (12 December 2018);

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