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Acta Optica Sinica, Volume. 40, Issue 19, 1923002(2020)

Optimal Design of Lightweight Off-Axis Mirror and Flexible Support

Yang Hu1、*, Ji Li1,2, and Xuezhi Jia1,2
Author Affiliations
  • 1Chang Guang Satellite Technology Co., LTD., Changchun, Jilin 130102, China
  • 2Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (16)
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    References (17)
    Cited By (8)
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    Paper Information
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    Figures & Tables(16)
    Schematic of optical system

    Fig. 1. Schematic of optical system

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    Component structures of original mirror

    Fig. 2. Component structures of original mirror

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    Surface shape solving process based on DRESP2

    Fig. 3. Surface shape solving process based on DRESP2

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    Iterative convergence curve and optimization result. (a) Iterative convergence curve; (b) SIMP topology optimization result

    Fig. 4. Iterative convergence curve and optimization result. (a) Iterative convergence curve; (b) SIMP topology optimization result

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    Structural parameters of mirror assembly. (a) Vertical view of mirror; (b) section view of mirror; (c) vertical view of athermal cone

    Fig. 5. Structural parameters of mirror assembly. (a) Vertical view of mirror; (b) section view of mirror; (c) vertical view of athermal cone

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    Flow chart of integrated optimization platform processing

    Fig. 6. Flow chart of integrated optimization platform processing

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    Iterative curves after optimization in different situations. (a) RMS values of surface shape at +4 ℃; (b) RMS values of gravity surface in x direction; (c) mass of reflector component; (d) eccentricity of x-gravity condition; (e) eccentricity of y-gravity condition; (f) eccentricity of z-gravity condition; (g) x-tilt of gravity condition; (h) y-tilt of gravity condition

    Fig. 7. Iterative curves after optimization in different situations. (a) RMS values of surface shape at +4 ℃; (b) RMS values of gravity surface in x direction; (c) mass of reflector component; (d) eccentricity of x-gravity condition; (e) eccentricity of y-gravity condition; (f) eccentricity of z-gravity condition; (g) x-tilt of gravity condition; (h) y-tilt of gravity condition

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    Surface shape analysis results under different conditions. (a) x-gravity condition; (b) 4 ℃ temperature rise

    Fig. 8. Surface shape analysis results under different conditions. (a) x-gravity condition; (b) 4 ℃ temperature rise

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    Camera mechanical vibration test platform

    Fig. 9. Camera mechanical vibration test platform

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    Sine frequency sweep test data. (a) x-direction sine sweep; (b) y-direction sine sweep; (c) z-direction sine sweep

    Fig. 10. Sine frequency sweep test data. (a) x-direction sine sweep; (b) y-direction sine sweep; (c) z-direction sine sweep

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    Surface interference detection site

    Fig. 11. Surface interference detection site

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    Test results of mirror before and after test. (a) Before test; (b) after test

    Fig. 12. Test results of mirror before and after test. (a) Before test; (b) after test

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    • Table 1. Performance indicators of common space camera materials

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      Table 1. Performance indicators of common space camera materials

      MaterialDensity /(g·cm-3)Young's modulus /GPaSpecific stiffnessThermal expansion coefficient /(10-6 ℃)Poisson's ratio
      Zerodur2.539136.00.050.24
      SiC3.05310101.62.500.14
      Invar8.1014117.40.05--7.000.25
      TC44.4410924.59.100.34
      SiC/Al3.0018060.08.100.18

    • Table 2. Optimal parameter combination results

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      Table 2. Optimal parameter combination results

      VariableValue rangeInitial valueOptimization
      Tback /mm[22.0,28.0]24.025.2
      Trib1 /mm[3.0,5.0]4.04.6
      Trib2 /mm[3.0,6.0]5.04.1
      Trib3 /mm[3.0,6.0]5.05.4
      Trib4 /mm[3.0,6.0]5.04.5
      Tc /mm[0.5,2.0]1.01.6
      D1 /mm[115.0,125.0]120.0118.3
      D2 /mm[205.0,210.0]205.03.0
      D3 /mm[208.0,215.0]210.03.0
      D4 /mm[55.0,80.0]76.064.2
      D5 /mm[45.0,75.0]66.052.8
      Dcone /mm[70.0,100.0]90.075.5
      θ1 /(°)[30,60]40.046.5
      θ2 /(°)[0,30]10.08.5
      θ3 /(°)[5,20]5.09.5
      θ4 /(°)[5,20]10.015.9
      H1 /mm[25.0,35.0]30.028.2
      H2 /mm[20.0,30.0]25.025.2

    • Table 3. Optimize analysis results

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      Table 3. Optimize analysis results

      ParameterDirectionGravity in x direction4 ℃ temperature rise
      x1.5×10-6-3.2×10-5
      Rigid body displacement /μmy9.3×10-18.0×10-4
      z-7.0×10-41.3×10-2
      Tilt /(″)x1.4×10-28.1×10-2
      y6.0×10-38.2×10-2
      Intrinsic frequency /Hz402.3
      m /kg2.42

    • Table 4. Frequency comparison in different situations

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      Table 4. Frequency comparison in different situations

      Loading directionIntrinsic frequency from experiment /HzIntrinsic frequency from analysis /HzRelative error /%Vibration mode
      x419.9423.50.8Swing around y axis
      y397.8402.31.1Swing around x axis
      z624.1635.61.8Vibration along z axis
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    Yang Hu, Ji Li, Xuezhi Jia. Optimal Design of Lightweight Off-Axis Mirror and Flexible Support[J]. Acta Optica Sinica, 2020, 40(19): 1923002

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    Paper Information

    Category: Optical Devices

    Received: Mar. 1, 2020

    Accepted: Jun. 19, 2020

    Published Online: Sep. 29, 2020

    The Author Email: Hu Yang (13649243140@163.com)

    DOI:10.3788/AOS202040.1923002

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology