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A novel hexapod and its prototype for secondary mirror alignment in telescopes
Yang, De-Hua1; Cheng, Ying1; Wu, Chang-Cheng1; Fei, Fei1; Jin ZY(金振宇)2
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2018-08-01
卷号18期号:9页码:10
DOI10.1088/1674-4527/18/9/115
产权排序第2完成单位
收录类别SCI
关键词Telescopes Methods: Analytical Methods: Miscellaneous Techniques: Miscellaneous
摘要

This paper presents a novel hexapod as the adjustment mechanism for a telescope to actively align its secondary mirror. The special hexapod provides six degrees of freedom (6-DOFs) with decoupled translation and rotation. The decoupled kinematic motions are analyzed and commented on as the alignment mechanism of a secondary mirror from an optical alignment point of view. In terms of performance of the adjustment generally required by the secondary mirror in a telescope, we developed a prototype that uses a novel hexapod design with linear micro-displacement actuators. Especially, in order to achieve high precision, flexures were used to build joints for the hexapod to minimize frictions and eliminate backlashes. Based on the specific configuration and dimension of the prototype hexapod, an analytical model of the reachable workspace was built with the constraints defined by limited rotation angles of the flexure-based joints. We used a laser tracker to verify that the hexapod can reach a spherical translation workspace of phi 6 mm and a rotation workspace of +/- 1 degrees. The translational repeatability was tested to be around half a mu m by laser displacement sensors. In addition, we also measured the axial and lateral stiffnesses of the hexapod to be around 5500 N mm(-1) and 1750 N mm(-1), respectively. The kinematic analyses and convincing test results jointly encourage implementing the novel hexapod design with decoupled translation and rotation as a favorable alignment mechanism for secondary mirrors in astronomical telescopes.

资助项目National Natural Science Foundation of China[U1531110]
语种英语
学科领域天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
ISSN1674-4527
URL查看原文
WOS记录号WOS:000445688500011
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/17923
专题抚仙湖太阳观测站
通讯作者Yang, De-Hua
作者单位1.College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
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GB/T 7714
Yang, De-Hua,Cheng, Ying,Wu, Chang-Cheng,et al. A novel hexapod and its prototype for secondary mirror alignment in telescopes[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(9):10.
APA Yang, De-Hua,Cheng, Ying,Wu, Chang-Cheng,Fei, Fei,&Jin ZY.(2018).A novel hexapod and its prototype for secondary mirror alignment in telescopes.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(9),10.
MLA Yang, De-Hua,et al."A novel hexapod and its prototype for secondary mirror alignment in telescopes".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.9(2018):10.
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