空间相机用大口径圆形主反射镜设计  

Design of Large Size Circular Primary Mirror of Space Camera

作　　者：王忠善[1] 何欣[1] 付亮亮[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《红外》2014年第9期15-18,共4页Infrared

摘　　要：主镜是空间相机的主要成像部件,其面形误差和位置误差将会决定成像质量。设计了一种孔径为9660 IlllTI的圆形主镜组件。通过对比6点定位原理实现反射镜体的全约束,并经三点在背部支撑主镜,其中每点均为多层柔性结构。合理分配每点支撑的自由度及刚度,同时卸载温度变化时由于材料的线胀系数不同而传递到反射镜上的应力,使反射镜变形均匀。有限元分析结果表明,本文设计的主镜组件的面形误差RMS值达到1/50λ(λ=632.8 nm),一阶模态达到249 Hz,并具有良好的动态刚度。A primary mirror is a main imaging part and position error will decide the quality of imaging of a space camera. Both its surface figure error A circular mirror assembly with an aperture of （P660 mm is designed. It is restricted completely according to the six-point orientation principle. Its backside is supported by three fixers which are flexible multilayer frameworks. By reasonably distributing the freedom and rigidity of each supporting fixer and unloading the stress due to different expansion coefficients of different materials when temperature is changing, the distortion of the primary mirror assembly is symmetrical. The Finite Element Method （FEM） analysis result shows that the primary mirror assembly has a surface figure error （root-mean-square （RMS） value） up to 1/50λ, （λ=632.8 nm）, a first mode of 249 Hz and good dynamic rigidity.

关 键 词：空间相机 主镜 温度适应性 有限元分析 

分 类 号：V445.8[航空宇航科学与技术—飞行器设计]