Infrared and Laser Engineering, Volume. 50, Issue 8, 20200517(2021)
Optical design and analysis of compact visible and medium-wave infrared whisking broom imaging system
Figures & Tables(18)
Fig. 1. Diffraction-limited MTFs of catadioptric lens under different line obscuration ratio
Fig. 2. Raytrace diagram (a) and MTFs (b) of the two-mirror Ritchey Chretien system
Fig. 3. Two-dimension (a) and three-dimension (b) raytrace diagrams of the MW infrared/visible shrink-beam system
Fig. 4. MTFs of MW infrared/visible shrink-beam system (with full field angle of ±0.62°)
Fig. 5. Raytrace diagram and position of the MW infrared/visible rear image system
Fig. 7. Three-dimension (a) and two-dimension (b) raytrace diagrams of the compact MW infrared/visible imaging detector optical system
Fig. 8. MTFs of the MW infrared/visible imaging detector on staring image mode (with full field angle of 0.77°×0.62°)
Fig. 9. MTFs of the MW infrared/visible imaging detector on whisking broom mode (with full field angle of 0.77°×0.62°)
Fig. 10. Focusing components and effects for the MW infrared image sub-system with thermal adaptability
Fig. 11. NITDs of surfaces and total NITD of the MW infrared image sub-system
Fig. 12. PST of the MW infrared image sub-system at different incident angles
Table 1. Optical system parameters of visible and medium-wave infrared imaging detector
View tableView in ArticleTable 1. Optical system parameters of visible and medium-wave infrared imaging detector
Visible optical detector Medium-wave infrared optical detector Waveband/μm 0.6-0.9 3.6-4.9 Pupil aperture/mm 360 360 Full field of view angle/(°) 0.77×0.615 0.77×0.615 Focal length/mm 1752±2 1430±1 Pixel size/mm 0.0046 0.015 Image resolution ≥(5120×4096) ≥(1280×1024)
Table 2. Adjustment and Δ
MTF @33.34 lp/mm of focusing components at different temperatures and in vacuumView tableView in ArticleTable 2. Adjustment and Δ
MTF @33.34 lp/mm of focusing components at different temperatures and in vacuumNominal value −30 ℃ −10 ℃ 0 ℃ 10 ℃ 30 ℃ 50 ℃ 65 ℃ In vacuum Air interval value 20.16 20.15 20.16 20.16 20.16 20.16 20.17 20.17 20.16 Adjustment 0 0.64 0.38 0.27 0.15 −0.15 −0.38 −0.55 −0.21 ΔMTF 0 0.123 0.140 0.108 0.037 0.036 0.155 0.129 0.057
Table 3. Process and assembly requirements for MW infrared image sub-system
View tableView in ArticleTable 3. Process and assembly requirements for MW infrared image sub-system
Component list Process requirements Assembly requirements N ΔN Edge thickness difference Refractive index Decenter Linear tilt Space Primary mirror 2 0.5 - - 0.005 - 0.005 Secondary mirror 2 0.5 - - 0.005 0.005 0.02 Prism 5 0.5 0.01 1×10−3 0.1 0.05 0.02 Lenses 5 0.5 0.01 1×10−3 0.015/0.01 0.02 0.02
Table 4. Tolerance sensitivity analysis result of the MW infrared image sub-system
View tableView in ArticleTable 4. Tolerance sensitivity analysis result of the MW infrared image sub-system
Angle of view Nominal MTF values Calculated MTF values MTFT MTFS MTFT MTFS 0.0°, 0.0° 0.270 0.270 0.239 0.249 0.27°, 0.0° 0.263 0.227 0.233 0.196 0.385°, 0.0° 0.255 0.188 0.223 0.152 0.0°,0.22° 0.242 0.266 0.208 0.245 0.27°, 0.22° 0.232 0.221 0.198 0.191 0.385°,0.22° 0.225 0.185 0.191 0.150 0.0°,3.1° 0.214 0.261 0.175 0.237 0.27°, 3.1° 0.205 0.215 0.169 0.186 0.385°, 3.1° 0.202 0.183 0.169 0.152
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Bo Liu, Aimin Liu, Qiaoling Li, Laiyun Xie. Optical design and analysis of compact visible and medium-wave infrared whisking broom imaging system[J]. Infrared and Laser Engineering, 2021, 50(8): 20200517
Paper Information
Category: Infrared technology and application
Received: Dec. 5, 2020
Accepted: --
Published Online: Nov. 2, 2021
The Author Email: Liu Aimin (liuaimin1232003@163.com)
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