用于深海环境的光纤水听器基元设计与测试

打开文本图片集

关键词：光纤水听器；推挽式结构；声波灵敏度；深水耐压测试中图分类号：TH766 文献标识码：Adoi：10.37188/OPE.20253310.1550 CSTR：32169.14.OPE.20253310.1550

Design and test of fiber optic hydrophone element for deep-sea application

SUNXiaoyuan，GUANG Dong，DENG Caoyuan，YUBenli* （School ofPhysics and Optoelectronic Engineering，Anhui University，Hefei 23O6Ol，China） * Corresponding author， E -mail： benliyu@ahu. edu. cn

Abstract： In order to improve the acoustic sensitivity of a fiber optic hydrophone in a deep-sea environment，a deep-sea fiber optic hydrophone element based on a push-pull mandrel structure was designed. It could effectively detect target underwater acoustic signals of 10Hz at 3 00O meters in the deep sea. First，based on the Michelson interferometer，the composition and acoustic sensitivity of the fiber optic hydrophone with a push-pull mandrel structure were introduced. Then，the acoustic pressure conversion mechanism was analyzed using elastic mechanics theory. Afterward，the influence of the elastic tube structural parameters of the hydrophone primitives on acoustic sensitivity was simulated via the finite element method.Meanwhile，the working stability under deep-sea conditions was explored. According to the calculation results，five groups of fiber optic hydrophone elements with different structures and manufacturing processes were fabricated.Finally，the working performance of the five groups of fiber optic hydrophones at 3 00O meters deep-sea was tested using a high hydrostatic pressure acoustic sensitivity system to verify the influence of structural parameters and manufacturing processes on acoustic sensitivity in a deep-sea environment.The experimental results show that the structure parameters and fabrication process of fiber optic hydrophone can significantly afect its working performance and stability in deep-sea environment. After optimization，the fiber optic hydrophone's response of underwater acoustic signal in 10Hz-2kHz frequency band at 3 OOO meters deep-sea can reach -127 dB re rad/ μPa ，whichis 7dB rerad/ μPa higher than before. It basically meets the requirements of high sensitivity and reliable detection of sound waves for deep-sea application.

Key words： fiber optic hydrophone;push-pul mandrel structure; pressure acoustic sensitivity； hydrostatic pressure test

1引言

伴随着“海洋强国”战略的提出，国内的深海探测得到了极大的发展。（剩余10161字）