• Optics and Precision Engineering
  • Vol. 30, Issue 23, 3021 (2022)
Honghao WANG1,2,*, Jianli WANG1, Tao CHEN1, Yuyan CAO1, and Baogang CHEN1
Author Affiliations
  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun30033, China
  • 2University of Chinese Academy of Sciences, Beijing100049, China
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    DOI: 10.37188/OPE.20223023.3021 Cite this Article
    Honghao WANG, Jianli WANG, Tao CHEN, Yuyan CAO, Baogang CHEN. Measurement and calibration of optical axis changes caused by gravity for ground-based large-aperture telescope[J]. Optics and Precision Engineering, 2022, 30(23): 3021 Copy Citation Text show less
    Schematic diagram of 4 m telescope
    Fig. 1. Schematic diagram of 4 m telescope
    Finite element model of four-meter telescope
    Fig. 2. Finite element model of four-meter telescope
    Angle deviations between primary and secondary mirror vs. elevation angle of telescope
    Fig. 3. Angle deviations between primary and secondary mirror vs. elevation angle of telescope
    Position deviations between primary and secondary mirror vs. elevation angle of telescope
    Fig. 4. Position deviations between primary and secondary mirror vs. elevation angle of telescope
    Optical axis change of primary optical system vs. elevation angle of telescope
    Fig. 5. Optical axis change of primary optical system vs. elevation angle of telescope
    Relative rotation and displacement between primary optical system and tracking optics
    Fig. 6. Relative rotation and displacement between primary optical system and tracking optics
    Schematic diagram of determining telescope optical axis change
    Fig. 7. Schematic diagram of determining telescope optical axis change
    Optical axis change of primary optical system by light source vs. angle of telescope elevation
    Fig. 8. Optical axis change of primary optical system by light source vs. angle of telescope elevation
    Optical axis change of primary optical system by star vs. elevation angle of telescope
    Fig. 9. Optical axis change of primary optical system by star vs. elevation angle of telescope
    Schematic diagram of coma-free point
    Fig. 10. Schematic diagram of coma-free point
    Angle deviations between primary and secondary mirror after calibration vs. elevation angle of telescope
    Fig. 11. Angle deviations between primary and secondary mirror after calibration vs. elevation angle of telescope
    Position deviations between primary and secondary mirror after calibration vs. elevation angle of telescope
    Fig. 12. Position deviations between primary and secondary mirror after calibration vs. elevation angle of telescope
    Optical axis change of primary optical system after calibration vs. angle of telescope elevation
    Fig. 13. Optical axis change of primary optical system after calibration vs. angle of telescope elevation
    ParameterValue
    Diameter of primary mirror/mm4 000
    Approximate focal length/m108
    F-ratio27
    Field of view/(′)3
    Size of pixel/μm210×10
    Table 1. Specifications of 4 m telescope
    Honghao WANG, Jianli WANG, Tao CHEN, Yuyan CAO, Baogang CHEN. Measurement and calibration of optical axis changes caused by gravity for ground-based large-aperture telescope[J]. Optics and Precision Engineering, 2022, 30(23): 3021
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