Optics and Precision Engineering, Volume. 30, Issue 20, 2436(2022)
Design of airtight optical window and protector for aerial camera
Figures & Tables(14)
Fig. 1. Design process of optical window and optical window protector
Fig. 5. Schematic diagram of airtight optical window assembly structure
Fig. 6. Finite element mesh model of airtight optical window assembly
Table 1. Common window material parameters
View tableView in ArticleTable 1. Common window material parameters
Material Elastic modulus
/GPa
Poisson's ratio Density
/（kg·m-3）
Linear expansion coefficient
/（10-6 ℃）
Thermal conductivity
/（W·m-1·K-1）
Fused silica 75 0.17 2200 0.55 1.4 BK7 79 0.21 2530 3.5 1.2 ZnS 74.5 0.29 4080 7.6 16.7
Table 2. Optical input indexes
View tableView in ArticleTable 2. Optical input indexes
Item Index Optical band 400 nm~800 nm Surface accuracy requirements Equal thickness difference >105 nm Transmittance >97% Maximum flight altitude 8 000 m Pressure condition 2 atmospheres Temperature condition -55 ℃~+70 ℃
Table 3. Optical window materials and size parameters
View tableView in ArticleTable 3. Optical window materials and size parameters
Item Parameter Window name Hyperspectral camera window Visible light camera window Window material BK7 BK7 Optical aperture 145 mm×159 mm 92 mm×128 mm Window size 170 mm×184 mm 118 mm×154 mm Thickness 15 mm 15 mm
Table 4. Material attribute of optical window Assembly
View tableView in ArticleTable 4. Material attribute of optical window Assembly
Material Elastic modulus
/MPa
Poisson's ratio Linear expansion coefficient
/（10-6 K-1）
Position BK7 79200 0.21 7.5 Window Silicone Rubber 11.52 0.4 690 Rubber band 7A09 71000 0.33 23.6 Mounts and window glands
Table 5. Simulation analysis results of window glass and structure under different working conditions
View tableView in ArticleTable 5. Simulation analysis results of window glass and structure under different working conditions
Load case Hyperspectral camera window Visible light camera window Maximum stress/MPa Maximum deformation/mm Maximum stress/MPa Maximum deformation/mm a 7.55 1.53 10.94 1.61 b 3.19 0.30 2.97 0.27
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Songnian TAN, Yuan YAO, Yulei XU, Yongsen XU, Hao LI. Design of airtight optical window and protector for aerial camera[J]. Optics and Precision Engineering, 2022, 30(20): 2436
Paper Information
Category: Modern Applied Optics
Received: Jan. 10, 2022
Accepted: --
Published Online: Oct. 27, 2022
The Author Email: TAN Songnian (tansongnian@126.com)
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