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改进型卡塞格林光学系统的设计
引用本文:张磊,刘智颖,胡源,高天元.改进型卡塞格林光学系统的设计[J].长春光学精密机械学院学报,2011(4):30-32.
作者姓名:张磊  刘智颖  胡源  高天元
作者单位:长春理工大学光电工程学院,长春130022
基金项目:国家863计划项目资助
摘    要:普通的卡塞格林光学系统,其主次镜分别由抛物面和双曲面组合而成,非球面镜的加工难度大、成本高,针对这些特点对卡塞格林光学系统进行了改进。改进型的卡塞格林光学系统与传统的卡塞格林光学系统对比具有加工难度小、成本低等特点,通过在系统最前面附加前校正组,使得主次镜可以由球面面型实现,通过在像面前设置后校正组使视场也得到了提高,与传统的卡塞格林光学系统20'相比,它的视场可以拓宽到1.3°。系统设计结果通过传递函数与点列图的分析与衍射极限非常接近,为中等口径卡塞格林光学系统的设计提供了一个新的思考方法。

关 键 词:改进型卡塞格林光学系统  球面  遮拦比  视场  传递函数

Improved Design of Cassegrain Optical System
ZHANG Lei,LIU Zhiying,HU Yuan,GAO Tianyuan.Improved Design of Cassegrain Optical System[J].Journal of Changchun Institute of Optics and Fine Mechanics,2011(4):30-32.
Authors:ZHANG Lei  LIU Zhiying  HU Yuan  GAO Tianyuan
Affiliation:(School of Opto-electronic Engineering,Changchun University of Science and Technology,Changchun,130022)
Abstract:The traditional cassegrain system is generally composed of the parabolic primary mirror and the hyperbolic secondary mirror.The difficulty and cost of the manufacturing of the aspherical surface is very high.And the image quality is easy to be effected by the manufacture error and environment variation.Based on these characteristic,the improved cassegrain system is designed with preference of lower difficulty and cost manufacturing.The primary mirror and the secondary mirror are both spherical surface instead of the aspherical surface.The image quality is analyzed related to not only the optical component radius,thickness and the material but also secondary mirror central obscuration.The central obscuration ratio is chose reasonably based on the theory of annular diffraction.The field of view of the improved cassegrain system is enlarged from 20' to 1.3°.It is shown that the system assessed by optical transfer function and spot diagram is much closed to the diffraction limit.The successful improved cassegrain system design is demonstrated.It provides meaningful view for reflected optical system design.
Keywords:improved cassegrain system  spherical surface  obscuration ratio  field of view  optical transfer function
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