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根据激光多普勒测振技术进行声光通信的工作原理,设计一种新型、小型激光多普勒测振信号鉴频电路。该电路根据外差探测原理,本地振荡器输出信号与探测信号混频得到一路信号,经90°移相后的本地振荡器输出信号再与探测信号混频得到另一路信号,利用这两路信号得到了多普勒频移量和声源振动的频率。利用扬声器激发的水面模拟振源进行实验,表明该电路可有效测量的振动频率范围为300 Hz~10 kHz,证明可用于水下光声通信。
According to the working principle of laser Doppler vibration measurement technology for acousto-optic communication, a novel and small laser Doppler vibration signal frequency discrimination circuit is designed. The circuit according to heterodyne detection principle, the local oscillator output signal and the detection signal mixing to get one signal by 90 ° phase-shifted local oscillator output signal and then mixed with the probe signal to obtain another signal, the use of these two signals The frequency of Doppler shift and sound source vibration are obtained. Experiments using speaker-stimulated water surface analog vibration sources show that this circuit can effectively measure the vibration frequency range of 300 Hz ~ 10 kHz, which is proved to be suitable for underwater photoacoustic communication.