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±6μm,试验结果表明调焦机构具有较好的稳定性,满足±10μm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。
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.
作者
王凯
徐明林
解鹏
徐振
陶淑苹
WANG Kai;XU Minglin;XIE Peng;XU Zhen;TAO Shuping(Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033;University of Chinese Academy of Sciences, Beijing 100049)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2019年第12期29-36,共8页
Journal of Mechanical Engineering
基金
吉林省自然科学基金(20170101164JC)
吉林省优秀青年人才基金(20180520193JH)资助项目
关键词
高光谱相机
调焦机构
精度分析
CMOS靶面
动力学
hyperspectral camera
focusing mechanism
precision analysis
CMOS target plane
dynamics
