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 

机构地区：[1]Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China [2]Chinese Academy of Sciences Key Laboratory of On-orbit Manufacturing and Integration for Space Optics System,Changchun 130033,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Research in Astronomy and Astrophysics》2024年第1期178-187,共10页天文和天体物理学研究（英文版）

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)。

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 corrector.Then, the inverse kinematics of the platform is established and an open-loop control system is built based on it.Finally, 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 level.The 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.

关 键 词：methods:miscellaneous space vehicles:instruments telescopes MISCELLANEOUS 

分 类 号：P111[天文地球—天文学]