利用加速度计的大型光电望远镜抖动测量方法  

Jitter measurement for large opto-electronic telescope using accelerometers

作　　者：杨晓霞[1] 孟浩然[1] 阴玉梅[1] 王帅[1] 吴庆林[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033

出　　处：《电子测量与仪器学报》2013年第9期823-830,共8页Journal of Electronic Measurement and Instrumentation

基　　金：中科院第三期创新工程资助项目

摘　　要：为了克服传统抖动测量评价方法在更大VI望远镜上的局限性，提出了利用多加速度计来对抖动进行全面测量和评价的方法。在介绍加速度计测量原理及安装方式的基础上，重点说明了如何利用加速度计测量信息来获得系统抖动信息的时、频域数据处理方法，分析了直接时域积分方法的不足，提出了利用频域积分方法获得系统抖动统计特性的新方法。最后，在某1m级以上望远镜上做了抖动测量实验，结果表明，该测量方法可以计算0．5—500Hz频率范围内任意频率段的抖动RMS值，望远镜方位轴系在静态条件下最大抖动量在0．21”以内，闭环条件下最大抖动量在0．35”以内。加速度计不但能敏感齿槽力矩、摩擦力矩等内扰力引起的抖动，还能敏感因外扰力——风阻、地基振动等带来的轴系晃动，是全面评价望远镜抖动性能的有效方法。该测量方法可以为大型望远镜机械最优设计、控制带宽设计和系统最终性能指标评价提供数据支撑。In order to overcome the limitation for the traditional jitter measurement methods, a novel method using aceelerometers for jitter measurement was proposed. The principles for aecelerometers were first introduced and the placement of the aeeelerometers was discussed. The time domain and frequency domain data processing methods were studied and the limitation for time domain methods was analyzed. The frequency domain integral method was presented which can caeulate the statistic characteristics of the jitter using acceleration measurement. In the end, the jitter measurement experiment was performed on a 1 m telescope. The experimental results show that the root mean square （RMS） of the jitter can be calculated for arbitrary frequency intervals between 0.5 Hz and 500 Hz. The jit- ter RMS under static conditions is less than 0.21 aresecond and less than 0.35 aresecond under close loop condi- tions. The aecelerometers can reflect the cogging torque ,friction torque and wind torque, ground based vibration sim- ultaneously. This method can supply data support for the optimal mechanical designs, control bandwidth designs and the ultimate performance evaluation of the system.

关 键 词：抖动 加速度计 频域积分 大型光电望远镜 

分 类 号：TP206.1[自动化与计算机技术—检测技术与自动化装置]