直流分量跟踪法在单频干涉测长系统中的应用  

Tracking method of direct current component of output signal for single frequency laser interferometer

作　　者：薛江蓉[1] 孔令民[1] 王志兴[2] 程雪苹[1] 

机构地区：[1]浙江海洋学院物理系,浙江舟山316000 [2]南京理工大学理学院,江苏南京210094

出　　处：《红外与激光工程》2008年第S1期306-308,共3页Infrared and Laser Engineering

基　　金：浙江省舟山市科技项目(06110)

摘　　要：针对单频激光干涉测长系统光强"零漂"问题,提出一种跟踪系统输出信号直流分量的方法。该方法根据信号过"零点"斜率绝对值最大的特点,检测信号直流分量。对信号直流分量的跟踪为系统计数器触发电平的调整提供了依据,具有自适应性强的优点。对激光光强按0.9t的规律衰减,物体作非匀速运动情况进行了仿真分析,结果验证了物体低速运动时该方法的可行性。In order to solve zero drift of light intensity appeared in single frequency laser interferometer, a new method is presented that tracks the direct current component of output sine signal. Based on the characteristics that the absolute value of "zero" slope of the output signal is the maximum, the direct current could be detected. The method is analyzed by a numerical simulation on a possible mode: laser light intensity shows an exponential decrease of 0.9t, and the object moves in variable speed. The simul...

关 键 词：直流分量 单频激光干涉 跟踪 光强“零漂” 

分 类 号：TH744.3[机械工程—光学工程]