Design of straight-line focusing mechanism for space camera

AN Yuan; QI Ying-chun

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Design of straight-line focusing mechanism for space camera

Article | 更新时间：2020-08-12

- Design of straight-line focusing mechanism for space camera
- Optics and Precision Engineering Vol. 17, Issue 3, Pages: 609-614(2009)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,130031
  2. 吉林大学生物与农业工程学院,吉林长春 130022
- 作者简介：
- 基金信息：
- DOI：
  CLC： V475.2;V241.03
- Received：02 September 2008，
  
  Revised：27 October 2008，
  
  Published Online：25 March 2009，
  
  Published：25 March 2009
- 稿件说明：
移动端阅览
安源, 齐迎春. 空间相机直线调焦机构的设计[J]. 光学精密工程, 2009,17(3): 609-614

AN Yuan, QI Ying-chun. Design of straight-line focusing mechanism for space camera[J]. Editorial Office of Optics and Precision Engineering, 2009,17(3): 609-614
安源, 齐迎春. 空间相机直线调焦机构的设计[J]. 光学精密工程, 2009,17(3): 609-614 DOI：

AN Yuan, QI Ying-chun. Design of straight-line focusing mechanism for space camera[J]. Editorial Office of Optics and Precision Engineering, 2009,17(3): 609-614 DOI：

摘要

针对空间相机在使用时受空间环境中重力、温度及压力等因素的影响

引起各光学镜面位置相对变化

从而导致像平面与焦平面不重合的问题

在分析空间相机的3种调焦方式及调焦机构设计基本原则的基础上

针对某空间相机的要求设计了一种直线调焦机构。利用滚珠丝杠将旋转运动转化为直线运动

并结合直线导轨约束运动形式

采用绝对式编码器检测位移。该机构具有低摩擦、传动简单等优点

可有效地减少过多的传动环节所带来的传动误差。采取开环控制和闭环控制两种方式检验了该机构的精度

并讨论了误差产生的原因。实验数据的统计分析及残差分析表明

直线调焦机构的开环调焦精度为0.002 5 mm

闭环调焦的精度可达到0.001 5 mm

满足0.01 mm使用要求。

Abstract

When a space camera is effected by the changes of gravity

temperature

pressure in space environment

the image detector can not be matched with the focal plane for mirror position change. In order to improve the imaging quality

a straight-line focusing machanism driven by step motor and glided on liner guide is designed based on analysis of several kind of focusing methods and discussion on focusing mechanism.This mechanism uses ball screws to translate the rotation to the line movement

and select an absolute encoder to detect the displacement. It has the advantages of light friction and simple transmission chain and can reduce the transmission error effectively. The precision of this mechanism is checked by open-loop control and closed-loop control. Moreover

the mean value and standard deviation are calculated by statistics analysis

and the residual error curve is plotted based on the test data. The measuring results show that the focusing machanism has a high precision

the error of closed-loop control is 0.002 5 mm

and the error of open-loop control is 0.001 5 mm

which are less than the precision of permission.

关键词

Keywords

references

薛实福,李庆祥.精密仪器设计[M]. 北京:清华大学出版社,1991:225-244. XUE SH F, LI Q X. Precision Instrument Design[M].Beijing:Tsinghua University Press,1991:225-244.(in Chinese)[2] SUBBARAO M,TYAN J K. The optimal focus measure for passive autofocusing and depth-from-focus[J]. SPIE,1995,2589:89-99.[3] 丁亚林,田海英,王家骐. 空间遥感相机调焦机构设计 . 光学精密工程.2001,9(1):35-38. DING Y L, TIAN H Y,WANG J Q.Design on the focusing mechanism of space remote-sensing camera[J]. Opt. Precision Eng., 2001,9(1):35-38. (in Chinese)[4] 张洪文.空间相机调焦技术研究 . 北京:中科院研究生院,2003. ZHANG H W. Research on the anto-focusing technology for space camera .Beijing:Chinese Academy of Sciences,2003. (in Chinese)[5] REYNOLDSA G,HAMMONDA M,BINNSA L A. Camera correlation focus: an image-based focusing technique[J].SPIE,2005,5752:1032-1041.[6] 黄和平,夏寅辉,安成斌,等. 大口径、长焦距红外系统调焦机构设计[J]. 激光与红外,2005,35(10):745-747. HUANG H P, XIA Y H, AN CH B, et al.. Design on the focusing mechanism of long focus IR system[J].Laser & Infrared,2005,35(10):745-747.(in Chinese)[7] 费业泰.误差理论与数据处理(第四版)[M]. 北京:机械工业出版社,2003:52-55. FEI Y T. Error Theory and Data Processing(Fourth Edition) [M].Beijing:China Machine Press,2003:52-55. (in Chinese)

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