四反射镜光学系统像差分析与设计

Aberration Analysis and Design of Four-Mirror Reflective Optical System

反射系统具有体积小、重量轻成像性能优良等特点,在航天遥感中具有重要的应用潜力。分析了基于PW方法的四反射镜系统像差理论,推导了由系统遮拦比和放大率表示的系统初级像差表达式,并给出了四反射镜系统的基本设计过程。设计理论和方法适合于同轴四反射镜系统和离轴四反射镜系统的初始结构设计。基于PW方法的设计理论,设计了空间遥感用同轴四反射镜光学系统和一离轴四反射镜系统。两系统成像质量良好,结构紧凑,筒长与焦距之比可达1/6.4,体积和重量均满足技术指标要求,体现了四反射镜系统的优势,证明了理论分析的正确性与实用性。

Reflective optical systems have small size,light weight and excellent imaging performance,which makes it very popular in space remote sensing systems.The third order aberration expression and basic design process of four-mirror system are given by aberration analysis based on PW method.Two space remote sensing systems using coaxial and abaxial four-mirror system is designed under the guidance of the aberration theory.The two systems have excellent imaging performance.The systems have compact structure and the physical length to the EFL ratio is about 1/6.4.Both of the size and weight meet the technical requirements,the correctness and practicality of the theoretical analysis are proved.