| A secondary mirror adjustment system with hexapod structure for optical telescope application | |
Zhou, Nan ; Li, Chuang; Gao, Wei; Song, Zong Xi; Zhao, Chao; Ren, Guo Rui; Jing, Nan
| |
| 2014 | |
| 会议名称 | 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, AOMATT 2014 |
| 会议日期 | 2014-04-26 |
| 会议地点 | Harbin, China |
| 出版者 | SPIE |
| 会议主办者 | Chinese Academy of Sciences, Institute of Optics and Electronics (IOE); Chinese Optical Society (COS) |
| 产权排序 | 1 |
| 摘要 | Benefiting from low cost, light weight and reduced volume in launch, deployable optical telescopes will be extensively applied in microsatellites. As a result of manufactured tolerance and external disturbance, the secondary mirror can't arrive at designed position precisely after a deployable telescope is unfolded. We investigate an adjustment system with six degrees of freedom based on hexapod structure to solve this problem. There are mainly four parts in this paper. Firstly, the adjustment methods of deployable telescopes for microsatellites are introduced. Generally several kinds of optical components can be adjusted to align a deployed telescope: primary mirror, tip/tilt mirror and secondary mirror. Due to its high sensitivity and convenience, the secondary mirror is chosen to collimate the optical system of the telescope. Secondly, an adjustment system with hexapod structure is designed for a secondary mirror with 85 mm diameter. After comparing the characteristics of step motors, piezo actuators and voice coil motors (VCMs), VCMs are selected as the linear actuators. By using optical gratings as displacement sensors in the system, we can make closed-loop control come true. The hexapod structure mainly consists of 6 VCMs, 6 optical gratings and 6 oblique legs with flexible hinges. The secondary mirror adjustment system is 83 mm in diameter and 55 mm high. It has tip/tilt rotational ranges of ±2.205° with resolution of better than ±0.007°, and translational ranges of ±1.545 mm with resolution of better than ±0.966 μm. Thirdly, the maximum stress and the maximum deformation in the adjustment system are computed with finite element method. At last, the kinematics problems of the adjustment system are discussed. |
| 作者部门 | 空间光学技术研究室 |
| 收录类别 | CPCI（ISTP） ; EI |
| 语种 | 英语 |
| ISSN号 | 0277786X |
| 文献类型 | 会议论文 |
| 条目标识符 | http://ir.opt.ac.cn/handle/181661/22589 |
| 专题 | 空间光学技术研究室 |
| 推荐引用方式 GB/T 7714 | Zhou, Nan,Li, Chuang,Gao, Wei,et al. A secondary mirror adjustment system with hexapod structure for optical telescope application[C]:SPIE,2014. |
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