Jitter measurement of giant steerable science mirror prototype

Qi-chang AN; Jing-xu ZHANG; Fei YANG; Hong-chao ZHAO

doi:10.3788/OPE.20182606.1392

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Jitter measurement of giant steerable science mirror prototype

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-07-05

- Jitter measurement of giant steerable science mirror prototype
- Optics and Precision Engineering Vol. 26, Issue 6, Pages: 1392-1397(2018)
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
  2.中国科学院大学, 北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20182606.1392
  CLC： TH751
- Received：31 October 2017，
  
  Accepted：06 December 2017，
  
  Published：25 June 2018
- 稿件说明：
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Qi-chang AN, Jing-xu ZHANG, Fei YANG, et al. Jitter measurement of giant steerable science mirror prototype[J]. Optics and precision engineering, 2018, 26(6): 1392-1397.
DOI：

Qi-chang AN, Jing-xu ZHANG, Fei YANG, et al. Jitter measurement of giant steerable science mirror prototype[J]. Optics and precision engineering, 2018, 26(6): 1392-1397. DOI： 10.3788/OPE.20182606.1392.

摘要

为了更好地对三十米望远镜三镜，即巨型科学可控反射镜（Giant Steerable Science Mirror，GSSM）的抖动（Jitter）特性进行研究，利用信号的复数表达分别分析了时域积分与频域积分的特性，明晰了二者之间的关系，并从积分精度的角度上，选择频域积分作为GSSM Jitter数据的处理方法。同时，对比了高精度编码器以及高精度加速度计对抖动测量的适用性，验证了使用加速度计测量的合理性。针对GSSM内部振动的影响，选择频响函数法测量内部作用力。最后，对GSSM缩比模型进行了Jitter检测，得到镜面方向Jitter为0.079 7

m，方位轴方向为14.143 2 mas，俯仰轴方向为20.747 5 mas，内部作用力为0.003 3 N。

Abstract

The Giant Steerable Science Mirror (GSSM) is the tertiary mirror of the future large telescope

Thirty Meter Telescope. The characteristics of jitter were analyzed in the time domain and frequency domain

including the relationship between them. By considering the integral precision

frequency domain integration was chosen as the GSSM dithering data processing method. Simultaneously

the applicability of a high-precision encoder and high precision accelerometer for jitter measurement was compared

and the rationality of using the accelerometer was verified. For the internal vibration of the system

the internal forces were measured by the method of Frequency Response Function. Using the above findings

the jitter detection of the GSSM prototype was carried out. The jitter in the mirror is 0.079 7

around the azimuth axis is 14.143 2 mas

around the tilt axis is 20.747 5 mas

and the internal force was 0.003 3 N.

关键词

Keywords

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