• Infrared and Laser Engineering
  • Vol. 51, Issue 5, 20210881 (2022)
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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    DOI: 10.3788/IRLA20210881 Cite this Article
    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 Copy Citation Text show less
    Cassegrain optical system
    Fig. 1. Cassegrain optical system
    Switching system. (a) State of Nasmyth focus; (b) State of Cassgrain focus
    Fig. 2. Switching system. (a) State of Nasmyth focus; (b) State of Cassgrain focus
    Components of the azimuth structure and translation stage
    Fig. 3. Components of the azimuth structure and translation stage
    Components of altitude structure
    Fig. 4. Components of altitude structure
    Control system
    Fig. 5. Control system
    Statics simulation
    Fig. 6. Statics simulation
    Modal analysis
    Fig. 7. Modal analysis
    Experimental test
    Fig. 8. Experimental test
    Experimental test data
    Fig. 9. Experimental test data
    Installation and adjustment on site
    Fig. 10. Installation and adjustment on site
    ItemRepeated positioning precision
    Azimuth/(″)2
    Altitude/(″)2
    Translation/mm0.02
    Table 1. Technology parameters
    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 2. Material properties of switching system
    ItemPV/nm RMS/nm
    Axial support13.7173.207
    Lateral support-116.5782.247
    Lateral support-216.5821.373
    Table 3. PV and RMS values under different support
    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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