基于激光水下爆炸声源的声探测技术

基于激光水下爆炸的声探测技术,设计了激光声水下目标探测器。对激光水下爆炸声源的产生机理进行研究,并开展水下探测器发射声信号检测的实验。实验结果表明:强脉冲激光聚焦于水介质产生爆炸性球面声源,探测器内部的声反射面将球面声信号转变为高指向性的平面波信号。通过对探测器的发射信号和接收的目标回波信号进行数值计算，得到探测器发射信号具有波束指向性窄、距离分辨力高和探测距离远等特点，满足水下目标探测的应用需求。

Detecting technology based on laser-induced sound by underwater explosion

An underwater detector was designed based on the technology of laser-induced sound by underwater explosion. The mechanism of underwater explosion sound by laser was studied, and then the detecting experimental system was built. The experimental results show that the laser-induced sound signal might be produced by high-power pulse laser breakdown under water, and that the spherical laser-induced sound signal can be changed into the plane wave signal by the acoustic reflector inside the detector. The laser-induced sound signals from the detector are found to have the characteristics of narrow-beam direction, high range resolution and long detection range by numerical calculation, which meet the requirement of underwater detection.