光学学报, 2019, 39 (11): 1122001, 网络出版: 2019-11-06   

制冷型自由曲面离轴反射光学系统设计 下载: 1029次

Design of Cooled Freeform-Surface Off-Axis Reflective Optical System
作者单位
1 中国科学院光电技术研究所, 四川 成都 610209
2 中国科学院大学, 北京 100049
3 长春理工大学光电工程学院, 吉林 长春 130022
摘要
与非制冷探测器相比,制冷型探测器具有灵敏度高、响应速度快和探测距离远等优点,已被广泛应用于红外光学系统中。为了有效抑制杂散光,制冷型探测器冷光阑位置需要与光学系统实出瞳位置重合。本文提出了一种制冷型离轴反射光学系统设计方法,通过光瞳离轴和视场离轴实现无遮拦设计,利用矢量像差理论可直接获得制冷型离轴反射光学系统的初始结构。针对长波红外制冷型探测器,设计了一个自由曲面离轴三反光学系统,满足了冷光阑的匹配条件。其光学系统的F数为2.5,焦距为300 mm,视场角为3°×5°。使用自由曲面校正光学系统像差,光学系统成像质量好,反射镜无倾斜和偏心,光学系统易于装调。
Abstract
Cooled detectors have the advantages of high sensitivity, fast response, and long detection distance as compared with uncooled detectors. Therefore, cooled detectors are widely used in infrared optical systems. To effectively suppress stray light, the cold stop of cooled detectors must be at the real exit pupil position of optical systems. In this study, a method for designing cooled off-axis reflective optical systems is proposed. In particular, an unobscured design is achieved by using an offset aperture stop and a biased input field. The initial configuration of cooled off-axis reflective optical systems is directly obtained based on vector aberration theory. A freeform-surface off-axis three-mirror optical system is designed for a long-wave infrared cooled detector that meets the cold stop matching condition. The F number of the designed optical system is 2.5, the focal length is 300 mm, and the field of view is 3°×5°. Freeform surfaces are used to correct the aberrations of the designed optical system and ensure that the designed system has a good imaging quality. The mirrors are free from tilts and decenters, making the designed optical system to be easily aligned.

操超, 廖胜, 廖志远, 白瑜, 陈炳旭, 范真节. 制冷型自由曲面离轴反射光学系统设计[J]. 光学学报, 2019, 39(11): 1122001. Chao Cao, Sheng Liao, Zhiyuan Liao, Yu Bai, Bingxu Chen, Zhenjie Fan. Design of Cooled Freeform-Surface Off-Axis Reflective Optical System[J]. Acta Optica Sinica, 2019, 39(11): 1122001.

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