全光光纤水听器系统海上试验

Seatests of an all-optical fiber-optic hydrophone system

阐述了光纤水听器拾取声压信号的基本原理。研制的光纤水听器探头尺寸为Φ22 mm×100 mm,相位灵敏度为-160 dB(参考值1 rad/μPa),波动小于3 dB,系统最小可测声压在1 kHz频点为43.5 dB,与零级海洋噪声水平相当。光纤水听器与标准水听器采集的宽带信号相关系数大于0.94,信号基本一致。23基元1 km传输全光湿端光纤水听器阵列于2002年8月在渤海进行了海上试验,相邻基元采集的气枪信号相关系数大于0.98,阵列具有良好波束指向性。光纤水听器关键技术的成熟为其走向应用奠定了良好基础。

Introduced the principle of fiber-optic hydrophone and how it detected of sound pressure. We fabricated some units of fiber-optic hydrophone, whose size wasφ22 mm×100 mm. Test showed its phase sensitivity was-160 dB(ref 1 rad/Hz1/2) and fluctuation was less than 3 dB and minimum measurable sound pressure was 43.5 dB (at 1 kHz), as much as sea-state zero(SSO). The correlation coefficient of signals, which were sampled by a fiber-optic hydrophone and a standard hydrophone, were over 0.94. A 23-element fiber optic hydrophone array was deployed at Bohai via 1 km fiber optic underwater cable on August, 2002. The sound source was air gun. The correlation coefficients of signals sampled by adjacent elements were over 0.98 and the array had a good beam directionality. Progress on fiber-optic hydrophone implied a great future for application.