第18卷第10期 2010年10月
文章编号1004-924X(2010)10-2239-05
光学精密工程
Optics and Precision Engineering
Vol.18No.10
Oct,2010
大尺寸焦平面空间相机调焦机构的精度分析
王书新1,2，李景林'，刘磊1，齐光1.2，任建岳1
（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.中国科学院研究生院，北京100039)
摘要：由于大尺寸焦平面空间相机调焦机构的焦平面两端存在的不可消除的同步运动误差会直接影响相机调焦精度，因此对焦平面两端同步运动精度进行了分析。首先，研究了大尺寸焦平面空间相机调焦机构的特点，提出了焦平面两端同步运动误差是影响其调焦精度的主要因素；其次，分析了影响同步运动精度的主要误差来源，建立了同步运动误差的数学模型，并采用蒙特卡罗仿真算法对数学模型进行了仿真分析；最后，通过测试焦平面两端同步运动精度对仿真结果进行了验证。仿真结果显示，同步运动精度为0.02mm，与试验数据分析结果0.023mm一致，说明此方法能够比较准确
地确定焦平面两端同步运动精度，为后续在轨调焦策略的确定以及同类产品的研制提供技术支持。关键调：空间相机；大寸焦平面；调焦机构；精度分析；蒙特卡罗算法
中图分类号：V475.3
文献标识码：A
doi:10,3788/OPE,20101810,2239
Accuracyanalysisoffocusingmechanism inspacecamerawithlong-focal-plane
WANG Shu-xin'-2, LI Jing-lin', LIU Lei', QI Guang'-2,REN Jian-yue(1.Changchun Institute of Optics,FineMechanics and Physics,
ChineseAcademy of Sciences,Changchun 130033,China;
2.Graduate University of Chinese Academy of Sciences,Beijing 100039,China)
Abstract: The synchronous motion accuracy at both ends of focal plane of a focusing mechanism in a space camera was analyzed, for it was difficult to be eliminated and would affect on the focusing accu racy of the camera directly. The characteristics of the focusing mechanism of the camera with a long focal plane were researched, then it pointed out that the synchronous motion error at both ends of fo-cal plane is the major factor that effects on the focusing accuracy of the camera. By analyzing main er ror sources of synchronous motion error, a mathematical model was established, and Monte Carlo Method was used to simulate the error model. Finally, the synchronous motion accuracy was tested to verify the validity of the simulation result. Simulation results indicate that synchronous motion accu-racy is O. o2 mm, which is coincident with the test data well. It is concluded that the method can esti-mate accurately the synchronous motion accuracy, and can support the determination of focusing strat-
收稿日期：2010-05-12；修订日期：2010-06-25.
基金项目：国家863高技术研究发展计划资助项目（No.86325113B)