Design of focusing system for multispectral camera with off-axis TMA

LV Shi-liang; LIU Jin-guo; JIA Ping; XU Dong

doi:10.3788/OPE.20132108.2154

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Design of focusing system for multispectral camera with off-axis TMA

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- Design of focusing system for multispectral camera with off-axis TMA
- Optics and Precision Engineering Vol. 21, Issue 8, Pages: 2154-2160(2013)
- 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,中国,130033
  2. 中国科学院大学北京,中国,100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20132108.2154
  CLC： TP394.1;TP732
- Received：07 February 2013，
  
  Revised：27 February 2013，
  
  Published Online：20 August 2013，
  
  Published：15 August 2013
- 稿件说明：
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吕世良刘金国贾平徐东. 离轴三反消像散多光谱相机调焦系统设计[J]. 光学精密工程, 2013,21(8): 2154-2160

LV Shi-liang LIU Jin-guo JIA Ping XU Dong. Design of focusing system for multispectral camera with off-axis TMA[J]. Editorial Office of Optics and Precision Engineering, 2013,21(8): 2154-2160
吕世良刘金国贾平徐东. 离轴三反消像散多光谱相机调焦系统设计[J]. 光学精密工程, 2013,21(8): 2154-2160 DOI： 10.3788/OPE.20132108.2154.

LV Shi-liang LIU Jin-guo JIA Ping XU Dong. Design of focusing system for multispectral camera with off-axis TMA[J]. Editorial Office of Optics and Precision Engineering, 2013,21(8): 2154-2160 DOI： 10.3788/OPE.20132108.2154.

摘要

空间环境的恶劣经常导致航天相机的成像平面偏离焦平面产生离焦，从而影响遥感成像质量。本文针对某航天离轴三反消像散多光谱相机设计了一种调焦系统对成像平面的离焦进行有效补偿。首先，分析了相机的离轴三反消像散光学系统和CCD焦平面的特点，确定调焦方式并阐述调焦系统工作原理。然后，介绍了调焦系统构成以及调焦控制器环境适应性、步进电机力矩选择、调焦传动机构的设计参数和位置编码器，推导出了调焦精度与调焦机构参数及编码器分辨率的关系，分析了调焦系统所能达到的调焦精度。最后，通过调焦系统测试了调焦行程内CCD焦平面直线位置与编码器码值的对应曲线。对闭环控制方式测试数据的计算分析显示，闭环调焦精度在3情况下为3.11 m，满足相机调焦控制精度10 m的要求。

Abstract

The defocusing of imaging plane for a space camera in stvere space environments will effect the imaging quality. It is necessary to compensate the defocusing effectively for the space camera to improve the adaptabilities and to get a high quality image. A novel focusing system was designed for a multispectral camera with off-axis Three Mirror Anastigmat(TMA) system. Firstly

the focusing method was chosen

and the principle of focusing was described by analyzing the characteristics of the off-axis TMA system and the CCD focal plane. Then

the focusing system was introduced in detail

including the working condition of a focusing controller，the way to calculate the torque of a stepper motor

and the design parameters of focusing mechanism and the position sensor. Furthermore

the correlation between the focusing accuracy and focusing mechanism

sensor resolution was deduced. Finally

the relative curve of CCD position with an encoder was obtained in the focusing range by the proposed focusing system. Experimental result shows that the focusing accuracy in closed-loop control is 3.11 m (3). It can satisfy the system requirements of 10 m.

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Keywords

references

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