长焦面空间相机调焦机构分析与验证  

Analysis and validation of large size focal-plane focusing device for space camera

作　　者：王忠善[1,2] 何欣[1] 崔永鹏[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 [2]中国科学院大学,北京100049

出　　处：《红外与激光工程》2014年第4期1206-1209,共4页Infrared and Laser Engineering

基　　金：中国科学院三期创新工程(07423JN70)

摘　　要：为了补偿空间相机由于地面定标环境和在轨工作环境不同及发射时振动冲击引起的焦面离焦,保证空间相机在轨成像质量,设计了焦面调焦机构。首先,针对尺寸超长焦面,采用增设调焦内框来增加焦面基板刚度,通过蜗轮蜗杆传动驱动丝杠运动实现机构自锁。其次,利用有限元分析软件patran/nastran建立了调焦机构的有限元模型,用mpc模拟导轨连接,对调焦机构进行模态分析。最后,对调焦机构进行了力学试验验证和精度测试。试验及测试结果表明:设计的调焦机构动态刚度高,一阶计算模态为228.7 Hz,而试验得到一阶模态为223.9 Hz,两者相差2%;调焦灵敏度达0.25μm,调焦精度达到6.3μm,焦面基板两端同步误差达到±4μm,满足航天相机对调焦机构高分辨率、高精度、高可靠性的要求。To compensate focusing offset of space camera, which was caused by environment difference between ground and on the track and maybe caused by shock when launching, a focal plane focusing device was designed to ensure image quality. First, for focal plane was so large, focusing frame was designed to enhance focal plane rigidity, self-lock was achieved through worm wheel driving screw. Second, fem model was established and mode analysis was achieved by patran/nastran, in which simulate guide rail by mpc. Finally, carried out dynamic environment testing and precision testing. Test results revealed that focusing device had dynamic frequency, first analysis characteristic frequency was 228.7 Hz, and first test characteristic frequency was 223.9 Hz, the relative error was 2%. Focusing resolution was 0.25μm, focusing precision was 6.3μm, synchronization error on focal plane was ＆#177;4μm. It can meet high resolution, high precision, high reliability needs of space camera.

关 键 词：调焦机构 调焦灵敏度 模态分析 调焦精度 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] TH691.9[自动化与计算机技术—计算机科学与技术]