光学学报, 2020, 40 (15): 1522001, 网络出版: 2020-08-14   

用计算成像扩大卡塞格林系统视场的方法 下载: 1067次

Method for Expanding Field-of-View of Cassegrain System with Computational Imaging
作者单位
长春理工大学光电工程学院, 吉林 长春 130022
摘要
卡塞格林光学系统的结构严重限制了视场,通常需添加辅助光学元件来扩大视场,但将导致系统结构复杂,不利于光学系统的小型化、轻量化。提出一种计算成像设计方法,首先优化系统结构参数,控制像差;然后构建系统的点扩展函数模型;最后采用反卷积算法处理图像。所提方法仅利用主、次镜结构就扩大了卡塞格林系统的视场。对F数为5.5,焦距为470 mm的卡塞格林系统进行仿真实验,实验结果表明,在1.5°视场范围内,处理后图像的轴外视场调制传递函数在20 lp/mm处提升了约0.2,图像质量得到明显提升。
Abstract
The structure of Cassegrain optical system severely limits its field of view (FOV). Generally, additional optical elements are needed to expand the FOV, but this approach leads to a complicated structure and does not facilitate a miniaturized and lightweight optical system. In this paper, a new method to expand the FOV of Cassegrain system using computational imaging was proposed. First, the structural parameters of the system were optimized to control the aberrations; then, a point spread function model was established; finally, a deconvolution algorithm was used to process the image. Eventually, the FOV of the Cassegrain system could be expanded using the structure that only comprised primary and secondary mirrors. A simulation experiment was conducted wherein a Cassegrain system with an F of 5.5 and 470-mm focal length was developed. The experimental result shows that in the FOV of 1.5°, the off-axis FOV modulation transfer function of the processed image is approximately improved by 0.2 at 20 lp/mm. Moreover, the quality of the image is significantly improved.

郑汉青, 崔庆丰, 胡洋, 孙林, 高旭东, 郭玉. 用计算成像扩大卡塞格林系统视场的方法[J]. 光学学报, 2020, 40(15): 1522001. Hanqing Zheng, Qingfeng Cui, Yang Hu, Lin Sun, Xudong Gao, Yu Guo. Method for Expanding Field-of-View of Cassegrain System with Computational Imaging[J]. Acta Optica Sinica, 2020, 40(15): 1522001.

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