• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (12): 29-36.doi: 10.3901/JME.2019.12.029

• 特邀专栏:空间机构设计青年学者专栏 • 上一篇    下一篇

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空间高光谱相机调焦机构精度分析与试验

王凯1,2, 徐明林1, 解鹏1, 徐振1, 陶淑苹1   

  1. 1. 中国科学院长春光学精密机械与物理研究所 长春 130033;
    2. 中国科学院大学 北京 100049
  • 收稿日期:2018-06-01 修回日期:2018-12-04 出版日期:2019-06-20 发布日期:2019-06-20
  • 通讯作者: 徐明林(通信作者),男,1988年出生,助理研究员。主要研究方向为空间光学遥感器结构与机构设计。E-mail:18345172432@126.com
  • 作者简介:王凯,男,1992年出生。主要研究方向为空间光学精密机械。E-mail:wangkaiciomp@163.com
  • 基金资助:
    吉林省自然科学基金(20170101164JC)和吉林省优秀青年人才基金(20180520193JH)资助项目

Precision Analysis and Experiment of Focusing Mechanism of Space Hyperspectral Camera

WANG Kai1,2, XU Minglin1, XIE Peng1, XU Zhen1, TAO Shuping1   

  1. 1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033;
    2. University of Chinese Academy of Sciences, Beijing 100049
  • Received:2018-06-01 Revised:2018-12-04 Online:2019-06-20 Published:2019-06-20

摘要: 针对空间高光谱相机的使用特性及要求,设计一套调焦范围±3 mm的像面移动式调焦机构,对偏离的焦面进行校正,以满足高光谱相机成像质量要求。介绍调焦机构的工作原理,对调焦机构的传动关系、定位精度进行理论分析;建立调焦机构的动力学模型,进行有限元分析;详细论述编码器码值与CMOS靶面位移关系测试方法,得到真实可靠的调焦公式;动力学试验表明,调焦机构一阶自然频率为182.7 Hz,可以有效地避免共振现象,加速度响应合理,具有较好的强度、刚度;同时在动力学试验前后,对调焦机构分别进行闭环精度测试,定位精度均优于±6 μm,试验结果表明调焦机构具有较好的稳定性,满足±10 μm的设计指标要求,验证调焦公式以及闭环控制程序设计的有效性。目前,此套调焦机构已经成功在轨运行,各项指标状态良好,满足高光谱相机的成像质量要求。

关键词: 高光谱相机, 调焦机构, 精度分析, CMOS靶面, 动力学

Abstract: For meeting the features and requirements of space hyperspectral camera, the image surface movable focusing mechanism is designed, the motion displacement is in the range of ±3 mm, correcting deviated focal plane, and meeting the imaging quality requirements of hyperspectral camera. The working principle of the focusing mechanism is introduced, and the transmission curve and positioning accuracy are theoretically analyzed; Dynamic model of the focusing mechanism is established and the finite element analysis is performed. The relationship test method of code value and displacement of CMOS target plane is discussed in detail, and obtain the reliable focusing formula. The dynamic experiments show that the first-order natural frequency of the focusing mechanism is 182.7 Hz, which can effectively avoid the resonance phenomenon, the acceleration response is reasonable, and has good strength and stiffness; Before and after the dynamic experiments, the closed-loop accuracy tests are performed on the focusing mechanism, and the positioning accuracy is better than ±6 μm, therefore the focusing mechanism has good stability, which satisfies the ±10 μm design index and verifies the effectiveness of focusing formula and closed-loop control programs. At present, this set of focusing mechanism has been successfully on-orbit operation, and the indicators are in good condition, which satisfies the imaging quality requirements of hyperspectral camera.

Key words: hyperspectral camera, focusing mechanism, precision analysis, CMOS target plane, dynamics

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