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中文摘要：
提出了一种可实现非接触、远距离、高灵敏度的激光多普勒语音检测系统。该系统采用压电陶瓷（PZT）对迈克尔逊干涉仪的参考信号进行调制,利用相位产生载波法（PGC）对干涉信号解调,提高了零差干涉法的抗干扰性,并且具有光路简单、成本低等优点。推导了干涉信号的解析表达式,数值分析了PGC解调参数的最优值。实验结果表明：该系统能动态测量音频范围内的微弱振动,可较好地还原语音信号。
英文摘要：
Acoustic signal detection using laser Doppler effect system to implement non-contact,remote,and high sensitive acoustic signal vibration detection was proposed.In the system,the reference signal of a Michelson interferometer was modulated by piezoelectric ceramics（PZT）,the received signal was demodulated by the phase generated carrier（PGC） algorithm.Therefore,the system can improve the anti-interference performance and has the advantages of simple optical configuration and low cost.The parameters of the PGC algorithm were optimized according to the analytic form of the interference signal.The numerical results show that the optimum value of the parameter is 2.63.Finally,the experimental results illustrate that the system can dynamically detect the vibration caused by sound wave and can recover voice signal from the received signal.
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