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在利用激光多普勒效应进行远距离处固体面内位移测量时 ,散射光的多普勒信号强度、信噪比及信号质量是位移测量的极重要参量 ,它们直接影响位移测量的距离和精度。为此研究了激光多普勒差动方法、锁相放大、数字滤波等技术 ,设计出能获得最好结果的差动光路以及高灵敏度、高Q值的锁相放大器和能重构丢失信号的同态滤波系统等 ,实现了 5 0m处固体面内位移测量 ,其最大相对误差可以达到 1.5 %。
Doppler signal intensity, signal-to-noise ratio and signal quality of scattered light are the most important parameters in displacement measurement when using laser Doppler effect to measure the in-plane displacement at a long distance. They directly affect the distance and accuracy of displacement measurement . To this end, the laser Doppler differential method, phase-locked amplification, digital filtering and other techniques are studied to design a differential optical path that can achieve the best results and a high-sensitivity and high-Q lock-in amplifier and to reconstruct the lost signal Homomorphic filter system, to achieve a solid surface 50m displacement measurement, the maximum relative error can reach 1.5%.