Chinese Optics, Volume. 18, Issue 1, 70(2025)
Design of a medium-wave infrared zoom optical system with low tolerance sensitivity, large zoom ratio, and extremely short total length
Fig. 1. Structural diagram of ideal lens in the system at different focal lengths
Fig. 2. Schematic diagram of the system’s initial structure at a focal length of 900 mm
Fig. 3. Structral diagram of the designed system at different focal lengths
Fig. 4. MTF curves at different focal lengths before desensitization
Fig. 5. Distortion curves at different focal lengths before desensitization
Fig. 6. Tolerance analysis results before and after desensitization at different focal lengths
Fig. 7. Diagram of the most sensitive parameter changes in each component’s tolerances
Fig. 8. MTF curves at different focal lengths after desensitization
Fig. 9. Distortion curves at different focal lengths after desensitization
Table 1. Optical design parameters
View tableView in ArticleTable 1. Optical design parameters
Parameter Value Spectral range/μm 3～4.8 Focal length range/mm 30～900 System magnification 30×continuous Subsystem F# 4 Total system length/mm 337
Table 2. Focal length of each component
View tableView in ArticleTable 2. Focal length of each component
$ {f}_{1}' $ $ {f}_{2}' $ $ {f}_{3}' $ $ {f}_{4}' $ 428.6735 −67.4089 94.3725 −317.6971
Table 3. Distances between components
View tableView in ArticleTable 3. Distances between components
长焦(900 mm) 中焦(550 mm) 短焦(30 mm) $ {d}_{12} $ /mm305.0904 293.8556 13.4818 $ {d}_{23} $ /mm26.9860 53.9271 405.9571 $ {d}_{34} $ /mm98.5523 82.8460 11.1899
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Yu-zhe LI, Yuan HU, Jia-qi HUO, You-yu ZHANG, Tian-yuan GAO. Design of a medium-wave infrared zoom optical system with low tolerance sensitivity, large zoom ratio, and extremely short total length[J]. Chinese Optics, 2025, 18(1): 70
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Received: May. 24, 2024
Accepted: Sep. 4, 2024
Published Online: Mar. 14, 2025
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