【摘要】 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。更多还原

【Abstract】 With the limit of IR optical materials,it is difficult to design athermalized refractive zoom IR optical systems with a simple configuration.All-reflective zoom IR optical systems could be lightweighted,compact and free of chromatic aberrations,whose athermalization is easy,and reflective optical systems can be unobscured by offsetting mirrors.Basic theory of reflective zoom optical systems was discussed.Gauss solution of initial configurations of reflective zoom systems was analyzed,and the method of calculating initial configurations was given.An off-axis three-mirror reflective zoom IR optical system was designed,whose effective focal length varied from 300 mm to 600 mm,F number is 2.1,and working wavelength was between 8 μm and 12 μm.The system used an uncooled LWIR detector with a cutoff frequency as 14 lp/mm.The reflective zoom system has a stable image plane and good imaging quality,whose process of zooming is linear continuous.更多还原