Acta Photonica Sinica, Volume. 50, Issue 4, 218(2021)

Active Alignment Method of Telescope Based on Star Ellipticity of Multi Field of View

Bo LI1...2,3, Xiangyan YUAN1,2, Zhengyang LI1,2, and Haiping LU12 |Show fewer author(s)
Author Affiliations
  • 1Nanjing Institute of Astronomical Optics &Technology, Chinese Academy of Sciences, Nanjing20042, China
  • 2CAS Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics & Technology, Nanjing1004, China
  • 3University of Chinese Academy of Sciences, Beijing100049, China
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    Figures & Tables(18)
    Schematic diagram of PSF in collimated state and misalignment state
    Distribution of ellipticity e1,e2 on circular field of view
    PSF morphology in each field of view
    Convergence process curve of particle swarm optimization algorithm
    Monte Carlo analysis algorithm solution accuracy chart (Note: red dotted line represents tolerance range)
    Data distribution diagram of 100 operation results (note: green represents the reference value, red represents the tolerance range)
    AST3-3 Optical system light path diagram
    Photograph of AST3-3 telescope and star map
    Schematic diagram of position of the target star points in field of view
    The contrast map of star in misalignment state and realignment state in paraxial field
    The contrast map of star in misalignment state and realignment state in edge field
    RMS radius distribution vs field of view in design state, misalignment state and realignment state
    Encircled energy distribution diagram of full field
    • Table 1. Telescope system parameter table

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      Table 1. Telescope system parameter table

      ITEMSpecifications
      OpticsRitchey–Chrétien with field corrector
      Primary mirror aperture1.6 m(diameter)
      Secondary mirror aperture668 mm(diameter)
      Focal ratio(primary mirror)1.25
      Field of view2° (diameter)
      Image quality80% EE ≤ 0.6"
    • Table 2. Decenter and tilt tolerance of secondary mirror

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      Table 2. Decenter and tilt tolerance of secondary mirror

      ITEMTolerance range
      Decenter±0.01 mm
      Tilt±3.6"
    • Table 3. The ellipticity value of target and its solution in each field of view

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      Table 3. The ellipticity value of target and its solution in each field of view

      Field/(°)e1(target)e1(solution)e2(target)e2(solution)
      0×Maxfield0.0130.0130.0540.053
      -0.2×Maxfield0.0110.0100.1020.099
      0.6×Maxfield-0.112-0.0100.0090.010
      Maxfield-0.024-0.022-0.056-0.057
    • Table 4. Range of secondary mirror misalignment

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      Table 4. Range of secondary mirror misalignment

      ITEMRange of misalignment
      Decenter in X direction/mm(-0.2,0.2)
      Decenter in Y direction/mm(-0.2,0.2)
      Tilt in X direction/(")(-36,36)
      Tilt in Y direction/(")(-36,36)
    • Table 5. Comparison of preset value and solution value

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      Table 5. Comparison of preset value and solution value

      ITEMPresetSolutionPresetSolution
      Decenter in X direction/mm0.1700.1690.0500.059
      Decenter in Y direction/mm0.0800.083-0.080-0.083
      Tilt in X direction/(°)0.0800.080 30.0600.057
      Tilt in Y direction/(°)0.0300.030 90.0700.069
      Maximum RMS radius of image spot/μm14.45214.50414.37214.071
      EE80 Maximum/(")4.094.094.234.18
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    Bo LI, Xiangyan YUAN, Zhengyang LI, Haiping LU. Active Alignment Method of Telescope Based on Star Ellipticity of Multi Field of View[J]. Acta Photonica Sinica, 2021, 50(4): 218

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    Paper Information

    Category: Instrumentation, Measurement and Metrology

    Received: Nov. 22, 2020

    Accepted: Feb. 9, 2021

    Published Online: May. 11, 2021

    The Author Email:

    DOI:10.3788/gzxb20215004.0412002

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