Infrared and Laser Engineering, Volume. 53, Issue 10, 20240225(2024)
Effect of thermal deformation of spherical cover structure on imaging quality of compound eye optical system
Figures & Tables(17)
Fig. 1. (a) Optical path diagram of relay sub-camera; (b) Mechanical structure diagram of relay camera
Fig. 2. (a) MTF diagram of single subsystem; (b) Field curvature and distortion
Fig. 5. (a) Axial displacement nephogram; Partial enlarged view: (b) Central hole position; (c) Surrounding hole position; (d) Diagonal hole position
Fig. 6. (a) Hole location diagram; (b) Upper edge path setting; (c) Upper and lower edge path settings
Fig. 8. MTF diagram of relay sub-cameras with different hole positions in different fields of view. (a) Position 3; (b) Position 5; (c) Position 6
Table 1. System specific parameters
View tableView in ArticleTable 1. System specific parameters
Parameter Value Focal length of sub-eye f1/mm 53 Angle of adjacent sub-eye $ \Delta \varphi $ 6.8 Number of sub-eye N 9 Focal length of system f/mm 40 FOV (Field of view) 2 $ \omega $ 22.6 Overlapping field of view range $ \Delta $ 2.85 Total volume of the system V 390 mm ×100 mm×100 mm Total weight M/g 1350
Table 2. Wavefront aberration at different wavelengths and field of view angles
View tableView in ArticleTable 2. Wavefront aberration at different wavelengths and field of view angles
Wavelength λ/nm Field of view $ \omega $ Wavefront aberration RMS 486 0 0.0730 486 4.5 0.1935 587 0 0.0284 587 4.5 0.1323 656 0 0.0941 656 4.5 0.0697
Table 3. Comparison of parameters between simulation mesh and reference mesh
View tableView in ArticleTable 3. Comparison of parameters between simulation mesh and reference mesh
Mesh type Value of nodes Value of element Low density (hexahedral mesh) 30912 22872 High density (hexahedral mesh) 222704 188560
Table 4. Material properties of the model
View tableView in ArticleTable 4. Material properties of the model
Parameter Value Density $ \rho/\times10^3\mathrm{\ kg}\cdot\mathrm{m}^{-3} $ 7.85 Poisson's ratio $ \mu $ 0.3 Coefficient of thermal expansion $ \alpha $ 12 Elastic modulus $ E/\mathrm{MP_a} $ 200000
Table 5. Comparison of maximum deformation calculation between low density mesh and high density mesh under different temperatures
View tableView in ArticleTable 5. Comparison of maximum deformation calculation between low density mesh and high density mesh under different temperatures
Temperature/ ℃ Low density mesh/mm High density mesh/mm D value/ mm Error rate 30 0.04354 0.04364 0.00010 0.22915% 40 0.09796 0.09819 0.00022 0.22407% 50 0.15239 0.15273 0.00034 0.22262% 60 0.20681 0.20728 0.00047 0.22267% 70 0.26123 0.26183 0.00060 0.22916% 80 0.31566 0.31637 0.00071 0.22442% 90 0.37008 0.37092 0.00084 0.22646% 100 0.42451 0.42547 0.00096 0.22563%
Table 6. Eccentricity and axial displacement of different hole positions
View tableView in ArticleTable 6. Eccentricity and axial displacement of different hole positions
Position $ \Delta x $ $ \Delta y $ $ \Delta z $ Structural steel-3 0.019 0.023 0.188 Structural steel-5 0.009 0.000 0.423 Structural steel-6 0.039 0.000 0.266
Table 7. Inclination values of different hole positions
View tableView in ArticleTable 7. Inclination values of different hole positions
Position $ {\theta }_{x} $ $ {\theta }_{y} $ $ {\theta }_{z} $ Structural steel-3 0.270 0.268 0.065 Structural steel-5 0.000 0.000 0.000 Structural steel-6 0.367 0.000 0.062
Table 8. Bring into the initial optical system
View tableView in ArticleTable 8. Bring into the initial optical system
Active Config 1 Config 2 Config 3 Config 4 THIC 137.004 137.192 137.427 137.270 PRAM1 0.000 −0.019 0.009 0.039 PRAM2 0.000 0.023 0.000 0.000 PRAM3 0.000 0.270 0.000 −0.367 PRAM4 0.000 −0.268 0.000 0.000 PRAM5 0.000 0.065 0.000 0.062
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Yuan WANG, Chen YANG, Shijie LI, Jin ZHANG. Effect of thermal deformation of spherical cover structure on imaging quality of compound eye optical system[J]. Infrared and Laser Engineering, 2024, 53(10): 20240225
Paper Information
Category: 光学设计
Received: Jun. 11, 2024
Accepted: --
Published Online: Dec. 13, 2024
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