随着激光技术的不断发展, 激光被应用于各个领域。针对激光在监听方面的应用, 提出用光电检测原理设计并制作了一套音频监听及定位系统。将系统放置于室外距离目标10 m处, 发射两束平行的激光到窗户的玻璃上并通过由两个传感器组成的接收系统来接收反射的光斑。由于室内传播的声波遇到玻璃并使其产生微小机械振动, 故导致进入硅光电池的光斑发生微小位移。通过采集变化的光电流信号, 还原室内声音信号内容, 达到监听、定位、记录的效果。在理论分析的基础上, 通过实验达到了验证效果, 并以提高监听质量为目的进行方法探索, 得到较好的结果。

With the development of laser technology, laser can be applied to various fields. With the aim of studying laser application in monitoring, a set of audio monitoring and positioning system was designed and produced using photoelectric detection principle. The system will be placed in outdoor about 10 meters far away from the goal, two parallel lasers will be lased to the window. And the reflection of the light spot will be detected by system composed of two sensors. As the spread of indoor sound meets glass, the glass will cause tiny mechanical vibration, making the light spot in the silicon photocell occur tiny displacement. Through the acquisition of the photocurrent signal change, the indoor sound signal content will be reduced to the monitor. The result of the experiment was satisfactory.