摘要:
基于谐衍射光学元件特殊的色差和热差特性,将谐衍射元件应用于红外搜索成像系统中,设计了一个双光谱宽温度范围的红外搜索跟踪成像系统,该系统工作波段为3.7-4.8μm和8.7-11.3μm, F 数为2.5,有效焦距为200 mm,全视场角为5?,环境温度为–80?C-200?C.设计结果表明,使用谐衍射透镜不仅可以使系统在两个波段范围成像优良,而且结构简单紧凑、透射比高、具有良好的消热差特性.
Abstract:
Because a harmonic diffractive optical element has special achromatism and athermalization, it can be applied to infrared dual-band search and tracking optical system. In this paper, we make the device that can be used in the wavelength ranges 3.7—4.8 μm and 8.7—11.3 μm;It has an efficient focal length 200 mm, the F/number 2.5, the full field of view is 5?. The environment temperature can be changed between–80 ?C—200 ?C. The practical design shows that the system not only shows good image quality in mid-and long-wave, but also the advantages of compact structure, high rates of transmission and athermalization.
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