光学学报, 2020, 40 (2): 0222001, 网络出版: 2020-01-02
高变倍比小型化的中波红外光学系统设计 下载: 1405次
Design of Mid-Wave Infrared Optical System with High Variable Ratio Miniaturization
摘要
针对制冷型中波红外640×512焦平面阵列探测器,设计了一个30×连续变焦光学系统,提出从前固定组中分离出1片透镜作为两档移动组,并与变倍组、补偿组及后固定组组合成复合连续变焦系统的设计方案。针对该模型,基于衍射光学理论设计了工作波段为3.7~4.8 μm,F数为4,可以实现12~360 mm连续变焦,光学总长仅有160 mm的制冷型中波红外连续变焦光学系统。给出了系统在6个焦距位置的像质情况,并对凸轮曲线进行优化设计。该系统具有高变倍比、结构小型化、像质优良、凸轮曲线平滑等优点,可以满足红外热成像仪的要求。
Abstract
The study proposes a 30× continuous zoom lens for 640×512 cooled mid-wave infrared focal plane detector array. Furthermore, we propose an optical system design that separates the lens from the front fixed group as a two-speed moving group, and combines the two-speed moving group, variable magnification group, compensation group, and rear fixed group into a composite continuous zoom system. To realize the above model, we design a cooling-type medium-wave infrared continuous zoom optical system based on the theory of diffractive optics. It has a working band of 3.7--4.8 μm, F-number of 4, continuously variable focal length of 12--360 mm, and total optical length of only 160 mm. We optimize the image quality and cam curves of the system at 6 focal lengths. The system offers advantages of a large variable ratio, miniaturized structure, excellent image quality,and smooth cam curve, which meets the requirements of infrared thermal imagers.
陈虹达, 薛常喜. 高变倍比小型化的中波红外光学系统设计[J]. 光学学报, 2020, 40(2): 0222001. Hongda Chen, Changxi Xue. Design of Mid-Wave Infrared Optical System with High Variable Ratio Miniaturization[J]. Acta Optica Sinica, 2020, 40(2): 0222001.