激光干涉法探测水下声信号

Underwater acoustic signals detecting with laser interferometry

为实现在空中利用激光技术对水下目标进行探测的目的,提出一种从水面散射激光中获取水下声源信息的方法.利用携带声波信息的散射光和参考光的干涉现象来获取水表面声波的频率和幅度信息.采用该方法建立的实验装置可准确探测水下声信号,验证了理论和仿真程序的正确性以及该方法的可行性,为航空遥感水下目标提供一种技术途径.

A method to catch underwater acoustic source infor mation with the help of scattered laser beams on water surface was developed to realize the purpose of detecting underwater ob ject from the air with laser technology. Frequency and amplitude information of water surface acoustic wave can be concluded from the interference of scattered laser beams carrying acoustic wave information with a reference beam. A testing installation established by using the proposed method can detect underwater acoustic signals, which verifies the adequacy of relevant theory and simulation process as well as practicability of the method. It also provides a technical way of aerial remote sensing underwater object.