| Author Name | Affiliation | | Min Zhang | Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033, China
University of Chinese Academy of Sciences, Beijing 100039, China | | Tao Chen | Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033, China | | Hongwen Li | Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033, China | | Fei Yang | Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033, China |
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| Abstract: |
| The TMT tertiary mirror system is facing a challenge of a rigid requirement for image jitter performance. The design of the mechanical structure and the devices selection will affect the image motion jitter for the telescope observation. In this paper, a jitter test experiment has been done on a similar configuration telescope to support the design of the TMT tertiary mirror system. A method of position tracking is explored for jitter test using a 32bit absolute angle encoder. Several kinds of disturbance sources which can affect the system jitter have been discussed. According to the experimental results, during the low speed tracking, the jitter is less than 10 milliarcsec RMS, and the design of the system can meet the jitter requirement the TMT tertiary mirror system. The NFIRAOS error rejection transfer function is given for the further correction of jitter. |
| Key words: TMT tertiary mirror system jitter low speed position tracking |
| DOI：10.11916/j.issn.1005-9113.15347 |
| Clc Number:TP13 |
| Fund: |
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| Descriptions in Chinese: |
| TMT三镜系统方位轴系的抖动测试与研究 张敏1,2，陈涛1，李洪文1，杨飞1 （1.中国科学院 长春光学精密机械与物理研究所，长春 130033； 2.中国科学院大学，北京 100039） 中文摘要：TMT三镜系统所面临的挑战是对于系统图像抖动性能的严苛要求。机械结构的设计与设备选型会影响望远镜观测过程的图像抖动。本文针对一个相似配置的望远镜进行了抖动测试实验，以支持三镜系统的设计。测试实验采用了32位绝对式编码器进行位置跟踪的方法，同时针对几种影响系统抖动的干扰源进行了讨论。实验结果表明，在低速跟踪过程中，抖动值小于10 RMS，系统设计能够满足TMT三镜系统的抖动要求，针对于抖动的进一步校正给出了NFIRAOS误差抑制传函。 关键词：TMT三镜系统；抖动；低速；位置跟踪 |
