利用声光效应实现信息传输及再读取

Information transmission and re-read by acousto-optic effect

利用声光效应通过调制激光传输声音信号,使用调幅电路将声音的电信号加载在高频信号上,信号驱动超声波换能器振动,超声波作用在激光入射的声光介质中产生声光效应使激光产生相应的衍射,衍射光斑光强随声音信号同步变化,光电探测器通过探测衍射光强产生相应电压,对输出电压信号的处理后就可以还原声音信号.

The acousto-optic effect was used to transmit sound signals through modulated lasers.In the experiment,the amplitude modulation circuit was used to modulate the electrical signal of the sound onto the high frequency carrier,and then drove the ultrasonic transducer to vibrate.The ultrasonic wave induced acousto-optic effect in the acousto-optic medium,causing diffraction of the incident laser beam.The intensity of the diffracted spot varied synchronously with the sound signal,and this variation was detected by aphotodetector.After processing the output voltage signal,the sound signal could be restored perfectly.