【作者】 刘伟；

【Author】 Liu Wei (Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun,Jilin 130033,China)

【机构】 中国科学院长春光学精密机械与物理研究所；

【摘要】 扫描反射镜用于星载超光谱成像仪成像补偿,按一定规律非匀速转动,对其速度稳定性要求较高,因此要求进行精确测量。根据高精度扫描镜系统主要运动指标:运动角速度的相对误差小于±4%,最大绝对误差要求小于±0.022°/s,自行设计了一套角速度检测系统,采用21位绝对式光电编码器用纯力偶联轴器联接扫描镜轴与扫描镜作同步运动进行测量,给出了数据处理方法,通过测试试验,得到实际的扫描镜角速度-位置曲线,对数据进行了处理,经过分析计算得到扫描镜系统的角速度相对误差及绝对误差都小于对扫描镜系统指标要求,证明扫描镜系统满足使用要求。更多还原

【Abstract】 Scanning mirror is so important for imaging compensation of spaceborne hyper-spectral imager,that speed high stability is terribly required,and should be measured accurately.This paper introduces the primary movement specification of high precision scanning mirror system:the relative error of angular velocity is±4%,and the absolute error of angular velocity is±0.022%. According to the specification,an angular velocity measurement system is designed,which satisfies testing precision terribly.The measurement system adopts an absolute encoder of 21 bits,which is connected to the rolling axis of scanning mirror with a coupling of pure couple of force and will rotate synchronously.With this measurement system,angular velocity—time curve of the scanning mirror is obtained,and the data is analyzed,which shows that the relative and the absolute speed error is smaller than specification. So the scanning mirror system is effective.更多还原