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 Yue1,2
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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    Figures & Tables(13)
    Cassegrain optical system
    Switching system. (a) State of Nasmyth focus; (b) State of Cassgrain focus
    Components of the azimuth structure and translation stage
    Components of altitude structure
    Control system
    Statics simulation
    Modal analysis
    Experimental test
    Experimental test data
    Installation and adjustment on site
    • Table 1. Technology parameters

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      Table 1. Technology parameters

      ItemRepeated positioning precision
      Azimuth/(″)2
      Altitude/(″)2
      Translation/mm0.02
    • Table 2. Material properties of switching system

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      Table 2. Material properties of switching system

      MaterialDensity/g·mm−3E/MPa Poisson ratioλ/W·m−1·K−1α/K
      Q2357.862120000.2884311.1×10−6
      40Cr7.822110000.2774412×10−6
      457.812001000.264811.59×10−6
      Zerodur2.54960000.241.60.1×10−6
      2A122.91410000.3315523.2×10−6
      4J368.11500000.2910.41.6×10−6
      Lead11.34170000.4234.829.3×10−6
    • Table 3. PV and RMS values under different support

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      Table 3. PV and RMS values under different support

      ItemPV/nm RMS/nm
      Axial support13.7173.207
      Lateral support-116.5782.247
      Lateral support-216.5821.373
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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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