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通过理论分析激光语音检测系统,提出一种引入参数估计误差的反正切解调补偿算法,并建立了系统总谐波失真与关键参数及其误差的定量数学关系式。文中用总谐波失真(THD)和无杂散动态范围(SFDR)分别表征系统微振动信号解调效果和可以与大干扰信号(阻塞信号)相区别的最小信号值。实现了非接触、远距离、高灵敏度的微振动信号检测。通过实验和仿真均验证了反正切补偿算法的可行性。实验结果表明:该系统可以检测音频范围内的微弱振动,在现有光学硬件平台基础上,利用文中提出的反正切补偿算法,能在35 m范围内较好地还原语音信号。
By analyzing the laser speech detection system theoretically, an arctangent demodulation compensation algorithm with parameter estimation error is proposed, and a quantitative mathematical relation between the total harmonic distortion of the system and the key parameters and their errors is established. In this paper, THD and SFDR are used to characterize the demodulation effect of the system micro-vibration signal and the minimum signal value that can be distinguished from the large jamming signal (blocking signal). To achieve a non-contact, long-distance, high sensitivity micro-vibration signal detection. The feasibility of the arc tangent compensation algorithm is verified through experiments and simulations. The experimental results show that this system can detect the weak vibration in the audio range. Based on the existing optical hardware platform, the proposed algorithm can effectively reduce the voice signal within 35 m.