面内位移测量的激光多普勒信号研究  

Study on Signals of In-Plane Displacement Measurement Utilizing Laser Doppler Effect

作　　者：贺顺忠[1] 刘彦宇[1] 蒋诚志[1] 陈林才[1] 姚欣[1] 

机构地区：[1]天津大学测试计量技术及仪器国家重点实验室,天津300072

出　　处：《光学学报》2003年第1期71-74,共4页Acta Optica Sinica

基　　金：国家教委博士点基金资助课题

摘　　要：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 %。When utilizing laser Doppler effect to measure in-plane displacement of an object in long distance, the intensity of Doppler signals of scattering light, SNR and quality of signals are very important parameters, and they affect the distance and accuracy of displacement measurement directly. The Doppler differential method, lock-in amplifier and homomorphic filter are studied. A differential optical measuring system with the best effect, a lock-in amplifier with high sensibility and high Q and a homomorphic system that can reconstruct the lost signals are designed. So the transverse displacement measurement of object in distance of 50 m is accomplished with the maximal relative error of 1.5%.

关 键 词：面内位移测量 激光多普勒信号 锁相放大 测量原理 数字滤波 

分 类 号：TB92[一般工业技术—计量学] TN247[机械工程—测试计量技术及仪器]