利用硫系玻璃与二元衍射面设计一款基于12 μm非制冷长波红外探测器（1 024×768 pixel）的红外消热差系统。该系统由3片玻璃构成，焦距为75 mm，F数为1，系统总长97 mm，系统总质量203 g。利用ZEMAX进行仿真分析，仿真结果表明：在−40 ℃～50 ℃温度范围内，系统奈奎斯特频率（42 lp/mm）处的MTF 均大于0.37，接近衍射极限；在−70 ℃～70 ℃温度状态下系统奈奎斯特频率（42 lp/mm）处的MTF也可以满足使用要求。该系统具有相对孔径大，全视场像质优良，结构轻量化，工艺性良好等特点。
Abstract
Using chalcogenide glass and binary diffraction surface, an infrared athermalization system based on the uncooled long-wave infrared detector (1 024×768 pixel) was designed. The system was composed of 3 pieces of glass, and the system had a focal length of 75 mm, an F −number of 1, a total length of 97 mm, and a total weight of 203 g. The simulation analysis using ZEMAX shows that, within a temperature range of −40℃～50℃, the modulation transfer function（MTF）value at the Nyquist frequency (42 lp/mm) of the system is greater than 0.37, which is close to the diffraction limit; between −70℃ and 70℃, the MTF at the system Nyquist frequency (42 lp/mm) under temperature can also meet the requirements. The system has the characteristics of large relative aperture, excellent full-field image quality, lightweight structure, and good manufacturability.
关键词
轻量化结构 /
二元衍射面 /
消热差 /
硫系玻璃 /
长波红外系统
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Key words
lightweight structure /
long-wave infrared system /
athermalization /
chalcogenide glass /
binary diffraction surface
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基金
国防科技创新小组增强微光瞄准镜 （远距型）项目（20-163-00-kx-001-003-02）
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