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。
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.
作者
郑汉青
崔庆丰
胡洋
孙林
高旭东
郭玉
Hanqing Zheng;Qingfeng Cui;Yang Hu;Lin Sun;Xudong Gao;Yu Guo(School of Opto-Electronic Engineering,Changchun University of Science and Technology,Changchun,Jilin 130022,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2020年第15期126-134,共9页
Acta Optica Sinica
基金
国家重大科技专项高分专项(51-H34D01-8358-13/16)。
关键词
光学设计
计算成像
卡塞格林
点扩展函数
图像复原
optical design
computational imaging
Cassegrain
point spread function
image restoration
作者简介
崔庆丰,E-mail:qf_cui@163.com。
