Opto-Electronic Engineering, Volume. 52, Issue 2, 240259-1(2025)
Optimized design of large aperture space camera structure
Figures & Tables(20)
Fig. 1. The optical system of the off-axis three-mirror reflective space camera
Fig. 3. The structural form of the support for the mirror assembly. (a) Mirror assembly structure form; (b) Flexible support structure form
Fig. 8. The camera modal shape. (a) The 1st order vibration mode; (b) The 2nd order vibration mode; (c) The 3rd order vibration mode
Fig. 10. Surface deformation of mirror. (a) Primary mirror; (b) Secondary mirror; (c) Tertiary mirror; (d) Folding mirror; (e) Focusing mirror
Table 1. The stability tolerance of optical system
View tableView in ArticleTable 1. The stability tolerance of optical system
Mirror Translation tolerance under xyz/mm Rotation tolerance under xyz/(″) Deformation of mirror X Y Z X Y Z Primary mirror Datum Datum Datum Datum Datum Datum RMS≤λ/50 (λ=632.8 nm) Secondary mirror 0.02 0.03 0.050 6 4 20 Tertiary mirror 0.15 0.15 0.015 18 18 36 Folding mirror / / 0.015 18 18 / Focusing mirror / / / 20 20 /
Table 2. Comparison of material properties for space structures
View tableView in ArticleTable 2. Comparison of material properties for space structures
Property LY12 TC4 ZTC4 M40 SiCp/Al Density ρ/(g/cm3) 2.80 4.44 4.40 1.60 2.95 Elastic modulus E/GPa 71 109 114 145 180 Thermal conductivity K/(W/m·℃) 120 6.8 8.8 0-3 235 Thermal expansion coefficient α/(10−6/℃) 22.7 9.10 8.90 −1 8.00 Specific stiffness E/ρ 25.4 24.5 25.9 5.28 60.0 Thermal stability K/α 5.92 9.10 9.88 −3-0 29.38
Table 3. The main dimensions optimization results of main frame
View tableView in ArticleTable 3. The main dimensions optimization results of main frame
Optimization parameter Optimization results Truss configuration Fig. 2 Inside diameter of truss d/mm 47 Outside diameter of truss D/mm 55 Truss length ln (n=1,2,3…)/mm 1270-1385 Bearing cylinder thickness t/mm 1.8
Table 4. The main dimensions optimization results of flexible support
View tableView in ArticleTable 4. The main dimensions optimization results of flexible support
Flexible structural parameter L1/mm L2/mm H/mm B/mm Primary mirror 110.0 70.0 100.0 6.0 Secondary mirror 49.0 32.8 36.6 2.9 Tertiary mirror 73.5 53.3 62.5 4.3 Folding mirror 50.0 34.1 36.5 3.1 Focusing mirror 30.0 20.4 27.0 2.2
Table 5. Modal analysis result of the camera
View tableView in ArticleTable 5. Modal analysis result of the camera
Order Frequency/Hz Mode shapes 1 36.5 Move along Y-axis 2 40.7 Move along X-axis 3 87.1 Local vibration of front frame
Table 6. The translation and rotation of other mirror compared with primary mirror in -Y direction
View tableView in ArticleTable 6. The translation and rotation of other mirror compared with primary mirror in -Y direction
Mirror Translation/µm Rotation/(″) PV/nm RMS/nm ΔX ΔY ΔZ θx θy θz Primary mirror 0 0 0 0 0 0 34.4 6.2 Secondary mirror −2.8 0.4 2.0 0.7 1.4 −1.3 18.3 3.2 Tertiary mirror −1.5 −0.1 0.8 −0.5 1.6 −1.4 19.7 3.6 Folding mirror −3.4 0.4 1.1 −0.2 −0.3 1.6 21.1 4.1 Focusing mirror −3.1 0.4 1.3 0.2 1.7 1.1 35.1 6.6
Table 7. The test results of camera wave aberration
View tableView in ArticleTable 7. The test results of camera wave aberration
Field of view −1.0 −0.5 0 0.5 1.0 Average Test results in -Y/λ 0.0686 0.0695 0.0597 0.0612 0.0687 0.0655 Test results in Y/λ 0.0726 0.0745 0.0690 0.0637 0.0706 0.0701
Tools
Get Citation
Copy Citation Text
Mingdong Shao, Jiang Guo, Yongpeng Cui, Liwei Yang, Longjia Zhou, Hao Wang. Optimized design of large aperture space camera structure[J]. Opto-Electronic Engineering, 2025, 52(2): 240259-1
Paper Information
Category: Article
Received: Nov. 5, 2024
Accepted: Jan. 14, 2025
Published Online: Apr. 27, 2025
The Author Email:
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20