激光探测水下声信号的实验研究

在实验室条件下,对于不同频率、不同振动强度的水下声音信号展开激光相干探测研究,建立了基于该方法的实验系统。水表面在水下声音信号作用下产生波动时,用激光照射水表面,其产生的水表面散射光携带了声波信息并与参考光发生干涉,对干涉信号进行采集并处理可得到水下声信号的频率与强度信息。对不同条件下得到的实验结果进行对比分析。实验结果表明,激光相干探测技术可有效地探测水下声信号,并且随着声信号的频率提高、强度减弱,探测效果趋于变差。实验系统采用全光纤光路设计,取得了较好的效果。

Experiment Research on Underwater Acoustic Signal for Laser Detection

A research on laser coherent detection is developed to detect underwater acoustic signals in differ-ent frequencies and vibration intensities under laboratory conditions. And an experiment system is establishedbased on the research. A beam of laser is irradiated water surface when the water surface is fluctuated by underwa-ter acoustic signals. The generated scattering light with acoustic wave information will interfere with reference light.Interference signals are collected and processed to obtain the frequency and intensity information of underwateracoustic signals. Experimental results obtained under different conditions are compared and analyzed. The resultsshow that underwater acoustic signal can be detected effectively with laser interference detection technology. Anddetection effects become weaker with the increasing of frequency and the weakening intensity of signals. Full fiberpath design is used in the experimental system and better effect is got.