傅里叶变换光谱仪动镜慢速运动控制仿真  

Simulation of Low Speed Movement of Moving Mirror under Control in Fourier Transform Spectrometer

作　　者：夏翔[1] 华建文[1] 段娟[1] 陈仁[1] 

机构地区：[1]中国科学院上海技术物理研究所,上海200083

出　　处：《计算机仿真》2014年第3期371-375,共5页Computer Simulation

基　　金：国家科工局"十二五"民用航天课题(Y1K1300G0)

摘　　要：研究傅里叶变换光谱仪动镜高精度匀速运动控制问题。传统控制方案通过对参考激光干涉脉冲信号计数来测量动镜速度,在慢速模式下无法达到对匀速区速度波动性的指标要求,因此提出一种新的控制方法。以参考激光干涉脉冲为触发信号,对高频时钟脉冲计数,根据运动到达半个激光波长的距离所需要的时间来计算当前动镜运动速度,并与期望值作比较,进行自适应PID控制。通过对傅里叶变换光谱仪中的运动机构建模并进行仿真,采用PID算法实现闭环控制,最后对仿真结果和预期作比对分析。经数据分析,新算法明显提高了运动精度,大大降低了匀速区的速度波动。Control of moving mirror operating with a high degree of uniformity in FTS （ Fourier Transform Spec- trometer） was researched. In the traditional control scheme, interference pulses of reference laser are counted and then velocity of moving mirror is calculated. In low speed mode, fluctuation of velocity caused by former scheme is too large to achieve the requirement, so a new scheme was put forward in the paper. Using interference pulses of ref- erence laser as trigger signal, high frequency clock signals were counted. According to the time needed to move a half wavelength of laser, the speed of moving mirror was calculated. Then the actual speed was compared with expected values, in order to control the moving mirror with adaptive PID algorithm. In this article, the module of moving framework in FTS was set up first, and then simulation was carried out. A closed-loop control of moving mirror was realized by PID algorithm and the result of simulation was compared with expected values. The data analysis shows that the uniformity of movement is significantly improved and the fluctuation of velocity is evidently reduced.

关 键 词：干涉仪 高精度 建模 仿真 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]