研究利用激光多普勒效应在远距离对一般散射面进行横向位移测量的检测技术 .通过在光路中对信号调制 ,在电路中利用锁相放大器提高信噪比 ,解决了微弱信号检测的问题 .用锁相环路对丢失信号重构 ,改善了信号质量 .对测量原理进行了分析 ,阐明了进行微弱信号检测和信号重构的机理 The detection technology of laser Doppler effect on the measurement of lateral displacement of general scattering surface is studied in this paper.By modulating the signal in the optical path and using the lock-in amplifier in the circuit to improve the signal-to-noise ratio, the weak signal detection problem is solved. The phase-locked loops are used to reconstruct the missing signal and improve the signal quality.The principle of measurement is analyzed and the mechanism of weak signal detection and signal reconstruction