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拖曳声纳阵列要求水听器在进行变速运动时不影响对水声压力信号的正常探测,这就要求水听器具有很高的抗加速度能力。为此介绍一种利用光纤光栅设计制造的对加速度不敏感而对水声压力信号具有高灵敏度的光纤水听器的实验研究结果。研制的光纤水听器声压灵敏度约为-140 dBrad/μPa,在25～6 300 Hz频率范围内具有平坦的声压灵敏度响应,波动小于±1.5 dB。在25～1 000 Hz频率范围内的加速度灵敏度不大于-30dBrad/g。
The towed sonar array requires that the hydrophone does not affect the normal detection of the underwater acoustic pressure signal during the shifting motion, which requires the hydrophone to have high anti-acceleration capability. To this end, we introduce the experimental results of a fiber optic hydrophone designed with fiber grating that is insensitive to acceleration and highly sensitive to acoustic pressure signals. The developed sound pressure sensitivity of the hydrophone is about -140 dBrad / μPa, with a flat sound pressure sensitivity response in the frequency range of 25-6 300 Hz, and the fluctuation is less than ± 1.5 dB. Acceleration sensitivity in the frequency range of 25 to 1 000 Hz is not greater than -30 dBrad / g.