Chinese Optics, Volume. 17, Issue 6, 1431(2024)
Design of cooled infrared dual-band zoom optical system with large-magnification-ratio
Fig. 2. Structural diagram of optical system in this paper under different conditions. (a) Short focus; (b) middle focus; (c) long focus; (d) super long focus
Fig. 3. MTF curves. (a) MWIR short focus; (b) LWIR short focus; (c) MWIR middle focus; (d) LWIR middle focus; (e) MWIR long focus; (f) LWIR long focus; (g) MWIR super long focus; (h) LWIR super long focus
Fig. 4. Diffuse speckle diagrams. (a) MWIR short focus; (b) LWIR short focus; (c) MWIR middle focus; (d) LWIR middle focus; (e) MWIR long focus; (f) LWIR long focus; (g) MWIR super long focus; (h) LWIR super long focus
Fig. 5. Distortion curves. (a) MWIR short focus; (b) LWIR short focus; (c) MWIR middle focus; (d) LWIR middle focus; (e) MWIR long focus; (f) LWIR long focus; (g) MWIR super long focus; (h) LWIR super long focus
Fig. 6. Diffraction enclosed energy diagrams. (a) MWIR short focus; (b) LWIR short focus; (c) MWIR middle focus; (d) LWIR middle focus; (e) MWIR long focus; (f) LWIR long focus; (g) MWIR super long focus; (h) LWIR super long focus
Table 1. Design specifications of the optical system
View tableView in ArticleTable 1. Design specifications of the optical system
项目 指标 工作波段/μm 3.7～4.8&7.7～9.5 焦距/mm 32；200；800； 1600 FOV/（°） 21.75；3.52；0.88；0.44 F数 4.0；8.0 变焦倍率 50× 冷屏到像面间隔/mm 20 总长/mm 300
Table 2. Wide-band infrared materials
View tableView in ArticleTable 2. Wide-band infrared materials
材料 透射范围 （μm） 折射率 （λ=4 μm） 阿贝数 （λ为3～5 μm） 阿贝数 （λ为8～12 μm） Ge 2～12 4.0247 103.4 834.3 ZnSe 0.55～18 2.4331 176.9 58.0 ZnS(BROAD) 0.42～18.2 2.3468 109.63 22.9 AMTIR1 1～14 2.5144 196.7 115.2
Table 3. Cold reflection severe surface MWIR/LWIR YNI and I/IBAR values
View tableView in ArticleTable 3. Cold reflection severe surface MWIR/LWIR YNI and I/IBAR values
表面 5 6 7 10 14 YNI −0.811 −0.849 0.044 0.176 0.516 −0.806 −0.845 0.047 0.185 0.522 I/IBAR 0.319 0.357 0.107 0.154 0.541 0.320 0.357 0.129 0.169 0.550
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Hai-tao GENG, Lin-yao YU, Bao ZHANG. Design of cooled infrared dual-band zoom optical system with large-magnification-ratio[J]. Chinese Optics, 2024, 17(6): 1431
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Received: Jan. 8, 2024
Accepted: Apr. 22, 2024
Published Online: Jan. 14, 2025
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