基于FBG对的低加速度灵敏度拖曳声纳阵水听器

FBG Pairs Besed Hydrophones for Towed Sonar Array with Low Acceleration Sensitivity

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。

Hydrophones with low acceleration sensitivity is expected in towed sonar array in order to detect acoustical pressure correctly while towed in the water.The experiment results of FBG hydrophones with low acceleration sensitivity and high acoustical pressure sensitivity are presented.The acoustical pressure sensitivity of the FBG hydrophone is about-140 dBrad/μPa and flat responsivity has been achieved over the frequency range of 25 to 6300 Hz with fluctuation less than ±1.5 dB.The acceleration sensitivity is not greater than-30 dBrad/g over the frequency range of 25 to 1 000 Hz.