Journal of Applied Optics, Volume. 44, Issue 5, 998(2023)

Design and analysis of support structure of small and medium-sized common optical path system

Xiaoqiang YANG*... Zhong TAO and Yingqi LIU |Show fewer author(s)
Author Affiliations
  • Xi'an Institute of Applied Optics, Xi'an 710065, China
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    Figures & Tables(15)
    Schematic diagram of optical system
    Optical indexes of initial state
    CAD model and FEM model
    Surface shapes of primary and secondary mirror after removing rigid body displacement and defocus at 60 ℃ temperature difference
    Optical indexes under uniform temperature difference of 60 ℃
    Surface shapes after removing rigid body displacement and defocus when primary mirror axial temperature gradient is 10 ℃
    Optical indexes under axial temperature gradient of 10 ℃
    Surface shapes after removing rigid body displacement and defocus when primary mirror radial temperature gradient is 10 ℃
    Optical indexes under radial temperature gradient of 10 ℃
    The first six-order vibration types
    • Table 1. Commonly-used mirror materials and properties

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      Table 1. Commonly-used mirror materials and properties

      材料密度ρ/(g/cm3)弹性模量E/GPa泊松比μ热膨胀系数α/(10−6/℃)导热系数k/(W/mK)
      FS2.19720.170.501.40
      ULE2.21670.170.031.31
      Zerodur2.53910.240.051.64
      K92.5279.20.2117.61.1
      Al 60612.70680.3322.5167
      Be I-701.852870.0811.4216
      SiC(HP)3.204550.142.40155
      SiC(CVD)3.214660.212.20300
      SiC(RB)3.094060.173.5156
    • Table 2. Commonly-used optical support structural materials and properties

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      Table 2. Commonly-used optical support structural materials and properties

      材料密度ρ/(g/cm3)弹性模量E/GPa泊松比μ热膨胀系数α/(10−6/℃)导热系数k(W/mK)
      铝合金2.70680.322.5167
      钛合金4.401140.338.67.4
      镁合金1.80400.325201
      殷钢8.901410.30~213.7
      Al/SiC3.00100~1800.25~0.358~16155~225
    • Table 3. Optical indexes at 60 ℃ temperature difference

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      Table 3. Optical indexes at 60 ℃ temperature difference

      工况材料组合去除刚体位移和离焦后的面型相面光学指标(中心视场)
      主镜RMS/λ次镜RMS/λ点列斑RMS半径/µm波前RMS/λMTF@63 lp/mm
      初始状态1.30.008 8优于0.45
      60 ℃温差殷钢和ULE0.01060.000692.40.021 8优于0.45
      钛合金和K90.00650.01381.90.015 9优于0.45
    • Table 4. Optical indexes under temperature gradient of 10 ℃

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      Table 4. Optical indexes under temperature gradient of 10 ℃

      温度梯度材料组合去除刚体位移和离焦后的面型相面光学指标(中心视场)
      主镜RMS/λ点列斑RMS 半径/μm波前RMS/λMTF@63 lp/mm
      轴向殷钢和ULE0.000841.4290.016 7优于0.4
      钛合金和K90.187121.7310.289 7远差于0.4
      径向殷钢和ULE0.00131.3590.010 2优于0.45
      钛合金和K90.357254.2340.630 2远差于0.4
    • Table 5. Modality and vibration types

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      Table 5. Modality and vibration types

      阶次殷钢和ULE组合钛合金和K9组合
      频率/Hz振型描述频率/Hz振型描述
      1263.55主镜沿光轴方向平动245.27主镜沿光轴方向平动
      2269.97次镜沿光轴方向平动249.27主镜Y向平动
      3276.66主镜Y向平动251.16次镜沿光轴方向平动
      4296.3主镜X向平动266.12主镜X向平动
      5335.9主镜绕Y轴摆动312.24主镜绕Y轴摆动
      6352.77主镜绕光轴横滚321.85次镜X向平动
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    Xiaoqiang YANG, Zhong TAO, Yingqi LIU. Design and analysis of support structure of small and medium-sized common optical path system[J]. Journal of Applied Optics, 2023, 44(5): 998

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    Paper Information

    Category: Research Articles

    Received: May. 20, 2022

    Accepted: --

    Published Online: Mar. 12, 2024

    The Author Email: YANG Xiaoqiang (sdk215@163.com)

    DOI:10.5768/JAO202344.0501008

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