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针对透射式红外变焦光学系统结构复杂,无热化设计较难等问题,提出全反射式红外变焦光学系统设计。讨论了该光学系统的变焦理论,对反射变焦系统初始结构进行了高斯解分析,给出了其初始结构的计算方法。设计了一离轴三反射镜红外变焦系统,系统焦距为300～600 mm,F数为2.1,工作波段为8～12μm,采用某型非制冷长波红外探测器,截止频率为14 lp/mm,系统变焦过程近似线性连续,像面稳定,像质良好。
Aiming at the problems of complex structure and non-thermal design of transmissive infrared zoom optical system, the design of total reflection infrared zoom optical system is proposed. The zoom theory of the optical system is discussed. The initial structure of the reflective zooming system is analyzed by Gauss method. The initial structure calculation method is given. An off-axis and three-mirror infrared zoom system is designed. The focal length of the system is 300-600 mm, the F-number is 2.1 and the working wavelength is 8-12 μm. The uncooled long-wave infrared detector has a cut-off frequency of 14 lp / mm, System zoom process is approximately linear continuous, image plane stability, good image quality.