一种基于调制激光信号采集器的设计

A Design of Signal Acquisition Based on Laser Modulation

设计了一种基于调制激光的音频采集装置。该装置通过控制激光二极管发射100kHz的调制激光信号,该信号照射到目标物体上,然后反射回接收端;接收端接收到激光信号,然后通过光电转换元件将光信号转换为电信号;此电信号再通过谐振放大,解调,滤波等电路,在目标物体上解析出由附近的音频震动产生的震动信号,从而还原出目标物体附近的音源,这样就可以做到非安装式音频情报采集。

An audio acquisition device based on modulated laser is designed,The device by controlling the laser diode emission 100 kHz modulated signal,the signal light the target object and reflected back to receiver.The receiver receives the laser signal and then through the photoelectric devices convert light signals into electrical signals.The electrical signals through a resonant amplofication,demodulation,filter circuit parse out vibration signal that produced by nearby audio of target object.Finally,the audio source of nearby object is recovered and so non mounted audio information collection can be done.