Chinese Optics, Volume. 17, Issue 1, 69(2024)
Design of cooled long-wave infrared optical system with large zooming range
Fig. 8. Distortion diagrams of optical system at four focal lengths
Fig. 11. The Relationship between phase and diameter of the binary optical element
Fig. 12. Signal-to-noise ratio of cold reflection on the detector’s focal plane in WFOV
Table 1. Parameters of optical system
View tableView in ArticleTable 1. Parameters of optical system
Index Value Spectral range/μm 7.7~9.5 Horizontal field of view/(°) 21.0、5.0、2.0、1.38 Focal length /mm 25、109、275、400 F# 3 Zoom ratio 15.0∶1 Working temperature −40℃~65℃
Table 2. Initial parameters of optical system
View tableView in ArticleTable 2. Initial parameters of optical system
Initial parameter value Initial parameter value ZR 15 $ \beta _3' $ −1.34 $ f_2' $ −1 $ \beta _4' $ 1 $ f_3' $ 1.62 $ {d}_{12} $ 0.55 $ \beta _2' $ −1.45 $ {d_{34}} $ 0.55
Table 3. Initial spacing parameters of front end zoom optical system
View tableView in ArticleTable 3. Initial spacing parameters of front end zoom optical system
参数 数值 系统焦距（mm） 400 275 109 25 d12(mm) 133.2 126.8 105.3 23.6 d23(mm) 16.3 36.1 82.2 192.1 d34(mm) 89.8 76.4 51.8 23.6
Table 4. Maximum tolerance items
View tableView in ArticleTable 4. Maximum tolerance items
公差操作项 表面 设置值（mm） RMS改变值(mm) TSDX 5 ±0.005 0.00315 TSDY 5 ±0.005 0.00315 TSDX 6 ±0.005 0.00315 TSDY 6 ±0.005 0.00315 TIRR 2 ±0.5 0.00089
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Han TANG, Li-kun XIA, Lian LIU, Yun LIU, Xuan LIU, Yu LIU, Run-qi ZHANG, Chun-fen ZHOU, Kai-yu YANG. Design of cooled long-wave infrared optical system with large zooming range[J]. Chinese Optics, 2024, 17(1): 69
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Received: Mar. 27, 2023
Accepted: --
Published Online: Mar. 28, 2024
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