Infrared and Laser Engineering, Volume. 51, Issue 5, 20210881(2022)

Design and analysis of Lijiang 2.4-meter telescope Nasmyth focus and Cassgrain focus switching system

Xin He1...2,3, Xiang Jiang1,2, Bozhong Gu1,2, Yu Ye1,2, and Zhongyu Yue12 |Show fewer author(s)
Author Affiliations
  • 1National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 210042, China
  • 2CAS Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics & Technology, Nanjing 210042, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
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    In order to solve the situation that the 2.4-meter telescope cannot switch Nasmyth focus and Cassgrain focus intelligently, a switching system was designed to switch focuses rapidly to improve the observation ability. Firstly, a M3 switching system model was built, the composition and implementation of the system were discussed in detail. Then precision analysis and finite element analysis were performed to optimize design. Finally, the calibration and test were carried out through experiment. Finite element analysis shows that under the action of gravity, the mirror surface shape RMS<λ/60 (λ=632.8 nm). The first-order modal of system reaches 34.71 Hz, the system has good stiffness. Experimental measurement shows that azimuth structure and altitude structure repetition precision are superior to 0.5″, translation stage repetition precision is 1 μm. The switching system meets the performance requirements and has been installed in the telescope, which has been used for observation. It also provides a reference for the design of other telescopes.

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    Xin He, Xiang Jiang, Bozhong Gu, Yu Ye, Zhongyu Yue. Design and analysis of Lijiang 2.4-meter telescope Nasmyth focus and Cassgrain focus switching system[J]. Infrared and Laser Engineering, 2022, 51(5): 20210881

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    Paper Information

    Category: Optical design

    Received: Nov. 24, 2021

    Accepted: Mar. 4, 2022

    Published Online: Jun. 14, 2022

    The Author Email:

    DOI:10.3788/IRLA20210881

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