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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。
Aimed at a kind of acoustic underwater target detection method, a laser acoustic underwater target detector was designed. The mechanism of laser acoustic signal generation is studied, and the experiment of underwater acoustic emission signal detection is carried out. The results show that the strong pulsed laser focused on the liquid medium can generate explosive spherical sound source, and the acoustic reflection inside the detector transforms the spherical acoustic signal into a highly directional plane wave signal. Through the numerical calculation of the transmitted signal of the detector and the received target echo signal, it is found that the transmitted signal of the detector has characteristics of narrow beam directivity, high range resolution and far detection distance, and can meet the application requirements of underwater target detection.