Optical Design of Light-Small MWIR Continuous Zoom System
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摘要: 根据连续变焦理论模型，编制连续变焦计算程序，求得变焦系统初始解，建立理想光学模型，通过选材选型及迭代优化，实现仅由4片红外透镜及两片平面反射镜组成的中波红外连续变焦光学系统。该系统F#为4、工作波段为3.7~4.8 μm、视场变化范围为20°×16°~2.0°×1.6°、光学零件最大口径为71 mm、零件总重64 g，系统包络为172 mm×108 mm，系统采用两个二元衍射面用于消色差，通过材料合理配置及主动补偿实现系统消热差设计。该中波红外连续变焦光学系统重量轻、总长短、包络小，在－40℃~+60℃温度范围全视场成像质量良好。Abstract: According to the theoretical model of continuous zoom optics, the continuous zoom calculation program is compiled, the initial solution of the zoom system is obtained, and the paraxial optical model is established. Through material selection and iterative optimization, a midwave-infrared continuous-zoom optical system consisting of only four infrared lenses and two planar mirrors was realized. The F number of the system is 4, the spectral range is 3.7 to 4.8 μm, the field of view (FOV) is 20°×16° to 2.0°×1.6°, and the maximum aperture of lenses is 71.0 mm, the total weight of the lenses is 64 g, and the system envelope is 172 mm×108 mm. The system uses two binary surfaces for the achromatic. The athermalization design of the system was realized through the rational allocation of materials and active compensation. The medium wave infrared continuous zoom optical system has the advantages of light weight, short total length, small envelope, and good image quality in the temperature range of -40℃ to 60℃.
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Keywords:
- optical design /
- MWIR /
- continuous zoom /
- athermalization
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图 1 正组补偿光学系统变焦模型
Figure 1. Principle diagrams of continuous zoom optical system with mechanical compensation
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图 5 硒化锌基底二元面环带与半径的关系
Figure 5. Relationship between the ring depth and radius of the ZnSe binary optical element
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图 6 硅基底二元面环带与半径的关系
Figure 6. Relationship between the ring depth and radius of the silicon binary optical element
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图 11 系统长焦时高低温下光学传递函数
Figure 11. MTF curves of continuous zoom optical system at high and low temperatures
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图 12 系统长焦时高低温下点列图
Figure 12. Spot diagrams of continuous zoom optical system at high and low temperatures
表 1 探测器参数
Table 1 Parameters of detector
Detector HgCdTe Array size 640×512 Pixel dimension/μm 15 NETD/mK ≤22 Spectral response/μm 3.7−4.8 μm Weight ≤380 g 
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表 2 光学系统设计指标
Table 2 Parameters of optical system design
Working waveband/μm 3.7 to 4.8 Zoom 10:01 Field of view 20°×16° to 2.0°×1.6° F# 4 Focal length/mm 27.0~275 Working temperature/℃ -40 to 60
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表 3 变焦系统初始间隔参数
Table 3 Initial spacing parameters of optical system
Focal length/mm 275 215 150 78.6 25.9 f1/f2 spacing/mm 83.49 80.06 74.56 59.44 18.90 f2/f3 spacing/mm 13.02 24.01 38.57 68.69 125.94 f3/f4 spacing/mm 67.23 59.67 50.61 35.61 18.90
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