热变形对低轨空间望远镜像质的影响分析  

Effect analysis of thermal deformations on image quality for low-orbit space telescope

作　　者：阎吉祥[1] 俞信[1] 张晓芳[1] 赵承潭[1] 

机构地区：[1]北京理工大学信息科学技术学院光学工程系,北京100081

出　　处：《光学技术》2006年第z1期635-637,共3页Optical Technique

摘　　要：为了用空间望远镜实现衍射极限成像,有待解决的基本问题之一是光学表面热变形所引起的像质下降。热效应可以分为热浸泡和热梯度两类。一般来说,热浸泡主要引起焦距变化,且通常处于所允许的范围内;而热梯度则难以控制。重点分析了望远镜主镜轴向热梯度的影响,并给出了一些数值计算结果。To achieve diffraction-limited imagery with a space telescope,a basic problem to be soluted is to avoid image degradation due to the thermal deformation of the optical surfaces.Thermal effects can be divided into thermal soaks and thermal gradients.Generally speaking,the only result of thermal soaks is a net change in focal length,which can usually be tolerated,while the thermal gradients are the most difficult to control.The effect of the axial thermal gradient through the primary mirror is analyzed.Some numerical results is presented.

关 键 词：空间望远镜 热效应 像质 

分 类 号：P111.2[天文地球—天文学] O435.2[机械工程—光学工程]