Design and Cryogenic Performance of a Hexapod Platform for a Large Ground-based Wide Field Survey Telescope

作     者：Yang Yu Xue-Wen Wang Yu Zhang Jia-Lin Sun Zhen-Bang Xu Jian-Li Wang Yang Yu;Xue-Wen Wang;Yu Zhang;Jia-Lin Sun;Zhen-Bang Xu;Jian-Li Wang

作者机构：Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Chinese Academy of Sciences Key Laboratory of On-orbit Manufacturing and Integration for Space Optics SystemChangchun 130033China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2024年第24卷第1期

页      面：178-187页

核心收录：

学科分类：0401[教育学-教育学] 04[教育学] 0704[理学-天文学] 

基　　金：supported by the Jilin Scientific and Technological Development Program (No.20220204116YY) the National Natural Science Foundation of China(No.62235018 and No.12133009) 

主　　题：methods:miscellaneous space vehicles:instruments telescopes miscellaneous 

摘      要：The thermal gradient is an important factor that causes degradation to the image quality of telescopes. In order to ensure the accurate alignment of the primary focus unit and the primary mirror, the hexapod platform(as a corrector) is investigated in this paper. First, a ground-based telescope with 2.5 m aperture and 3.5 deg field of view is described. The telescope is under construction, and it is expected to be finished in 2023. Second, the hexapod platform with flexure hinges utilized to adjust the primary focus unit is proposed, which is applied as a ***, the inverse kinematics of the platform is established and an open-loop control system is built based on ***, the cryogenic performance test for the hexapod platform is performed. The experimental results show that the resolution and repeatability of the translation for the hexapod platform can be achieved at the micrometer *** resolution and repeatability of the rotation can be achieved at the arc-second level. Therefore, the cryogenic performance of the hexapod platform can meet the optical imaging requirements of the wide-field ground-based telescope. The kinematic analysis and cryogenic performance tests in the paper provide a technical reference for the precise alignment of the primary focus unit and the primary mirror, which can improve the imaging quality of the telescope.