激光声水下目标探测器的设计

针对一种水下目标的声探测方法设计了激光声水下目标探测器。对激光声信号产生机理进行研究,并开展了水下探测器发射声信号检测的实验。结果表明:强脉冲激光聚焦于液体介质可以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,发现探测器发射信号具有窄波束指向性、高距离分辨力和远探测距离等特点,可以满足水下目标探测的应用需求。

Design of underwater target detector by laser-induced sound signal

An underwater target detector by laser-induced sound was designed based on a method of detecting the underwater target by sound.The theories of laser-induced sound was researched.The detecting experiment system of a small underwater target was built.The experimental results show that the laser-induced sound signal will be produced by high power pulse laser breakdown in water.The spherical laser-induced sound signal can be changed into the plane wave signal by acoustic reflector inside the detector.The laser-induced sound signals from the detector have the characters of narrow-beam direction,high range resolution and the long detection range by carrying out the numerical solution.The detector can complete the detection mission because of those characteristics.