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为了减小偏流角对空间光学相机成像质量的影响,分析了偏流角对空间光学相机成像质量的影响,对偏流角产生的原因及其像移补偿原理进行了研究。根据某空间光学相机的特点,采用在相机上设计调偏流机构的方法进行偏流角的补偿。通过几种常用的调偏流机构的比较,确定了采用双向丝杆螺母驱动的调偏流方案实现焦平面偏流角的调整。对调偏流机构进行了有限元分析,分析结果表明调偏流机构具有较高的刚度和动态强度。对调偏流机构进行了振动试验,并在试验前后进行调偏流机构精度的闭环检测,检测结果表明调偏流机构精度优于1′,调偏流机构偏流角调整范围为+5°～-5°,满足设计要求,实现了高精度的偏流角补偿。该调偏流机构具有强度高、刚度高、结构紧凑、稳定性好等优点。
In order to reduce the influence of drift angle on the imaging quality of space optical camera, the influence of drift angle on the imaging quality of space optical camera is analyzed. The reason of drift angle and the principle of image shift compensation are studied. According to the characteristics of a space optical camera, offset drift angle compensation is adopted by the method of designing a drift bias mechanism on the camera. Through the comparison of several commonly used biasing flow mechanisms, it is confirmed that the biasing direction of the focal plane is adjusted by using the bi-directional screw-nut driven bias transfer flow scheme. The finite element analysis of the drift bias mechanism was carried out. The analysis results show that the drift bias mechanism has higher stiffness and dynamic strength. The vibration test was carried out on the drift-biasing mechanism and the accuracy of the drift-biasing flow mechanism was tested before and after the test. The results show that the precision of the drift-biasing mechanism is better than 1 ’and the drift-angle adjustment range of drift-biasing mechanism is + 5 ° -5 °. Design requirements, to achieve a high-precision drift angle compensation. The biasing flow mechanism has the advantages of high strength, high rigidity, compact structure and good stability.