应用激光多普勒效应，设计了用两声光调制器获得三束测量光的声光调制、双光束差动、大口径接收的光学结构，提出了计算机实时跟踪丢失信号的位移补偿方法，实现了对普通纸张表面和前苏联生产的各种加工方法(车、铣、刨、磨)的粗糙度样板的二维面内位移的远距离测量，测量距离为10m，测量精度为±0.5%。

A novel displacement remoter measurement utillizing Dopples effect was proposed in this paper. The Doppler shift of differential structure was analyzed theoretically. The double-beam differential optical system with a optical-acoustic modulating structure, big aperture collecting backward scattering light, and compensating the losing signal by computer tracking software was designed. The displacement measurement of paper and rough mental surface at a distance of 10 meters has been achieved with an accuracy of ±0.5%.