分布反馈式光纤激光水听器拖曳线列阵实验研究

为了进一步增大光纤拖曳阵的探测距离,研制了缆径为16mm的32元分布反馈式光纤激光水听器拖曳线列阵.阵元在10~2 000Hz频率范围内的平均声压灵敏度为-142.7dB(re 1rad/μPa),波动幅度小于±2dB.基于声光调制器的时分、波分联合复用技术实现了32元光纤激光水听器的多路复用,各个阵元之间以及各个通道之间的串扰均小于-40dB,并完成了静态和动态拖曳湖上实验.实验结果表明,研制的32元分布反馈式光纤激光水听器拖曳线列阵无论是在静态,还是在6~16节的动态拖曳状态,都能对目标形成稳定的波束指向,与GPS轨迹记录完全一致,展现了分布反馈式光纤激光水听器拖曳线列阵在工程上的应用前景.

Experimental Research on DFB Fiber Laser Hydrophone Towed Line Array

To further increase the detection distance of optical fiber array, a prototype of 32-element distributed feedback fiber laser hydrophone towed line array with a diameter of 16 mm is developed.The acoustic pressure sensitivity of the element reaches to -142.7 dB with the fluctuation less than ±2 dB in a frequency range of 10~2 000 Hz.Based on the time division, wavelength division multiplexing technology and acoustic optic modulator, 32-element fiber laser hydrophone array multiplexing is realized.The crosstalk between each element and each channel are both less than -40 dB.The static and dynamic towed tests on the lake are completed.The distributed feedback fiber laser hydrophone towed line array can form stable beam pointing to the target in both the static and dynamic towed state of 6~16 knots, which is the same as the GPS record.The application prospect in engineering of the distributed feedback fiber laser hydrophone towed line array is demonstrated.