大口径轻质反射镜光轴水平卸载支撑方法  

Method of off-loading supporting for large aperture light weighted reflect mirror at optical axis horizontal situation

作　　者：周于鸣[1] 赵野[1] 王海超[1] 闻广泉[1] 

机构地区：[1]北京空间机电研究所,北京100076

出　　处：《红外与激光工程》2013年第5期1285-1290,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(40905011)

摘　　要：大口径轻质反射镜的重力环境下高精度检测是目前的一个难点,由于其轻量化程度高,绝对刚度低,在重力环境下,支撑形式的不同对光学检测结果影响巨大。提出了一种以提供提拉牵引力的方法实现光轴水平支撑测试的解决方案,通过一系列的滑轮组的自适应调整,获得预定义的力学支撑,实现轻质反射镜光轴水平状态重力环境下的高精度面形测试。有限元力学分析结果表明,依据本方法开展的光轴水平状态检测,能够有效减少重力引起的光轴竖直和光轴水平两种状态下的面形变化RMS值差异,其差异值小于0.003λ(λ=632.8 nm)。文中所提出的方法具有良好的可实施性,它可推广应用到其他大口径轻质反射镜的检测支撑的设计中,为此类大口径相机的研制提供技术基础。The precise testing of large aperture light weighted reflecting mirror in gravity environment is a difficult problem at present. In view of the high rate of light weighting and the absolute low stiffness, in this situation, different forms of support have huge impacts on optical test results in gravity environment. In this paper, a solution was suggested that pre-defining of supporting force was achieved through a series of pulley blocks self-adapting to solve large aperture mirror testing in gravity environment. The result of mechanics model analysis shows that the testing of optical axis horizontal can reduce the Rams variation of surface shape effectively, which is caused by gravity in vertical and horizontal state, and the variation less than 0.003 ）t （）t=632.8 rim）. The method can be extended and applied to the design of testing supporting for other large aperture light weighted reflect mirror, and provid; technology foundation for large aperture mirror.

关 键 词：大口径轻质反射镜 光轴水平 重力卸载 有限元仿真 

分 类 号：V445.8[航空宇航科学与技术—飞行器设计]