空间相机调焦机构运动同步性误差分析

研究了空间相机调焦机构的运动同步性误差对成像质量的影响。针对某型空间相机的大尺寸焦面调焦机构，分析了运动同步性误差产生的原因。按照其光学系统参数计算得出当系统光学传递函数下降不超过5％时，调焦机构运动同步性误差的最大允许值为0.02 mm。针对其采用的调焦机构，推导出运动同步性误差计算公式，并计算得到该调焦机构的最大运动同步性误差为0.015 mm。最后，对该调焦机构进行了实际测试。测试结果显示，该调焦机构的运动同步性误差在振动实验前后分别为0.012和0.013 mm，表明该机构的运行非常稳定。理论分析以及实验结果证明了该调焦机构完全满足应用要求。

Analysis of synchronous motion error for focusing mechanism of space camera

The effect of synchronous motion error for the focusing mechanism of a space camera on the image quality is explored .For a large size focusing mechanism , the paper analyzes the reasons causing the synchor-man motion error .According to the optical system parameters of a certain space camera , it draws a conclusion that when the Modulation Transfer Function （ MTF） of the optical system declines no more than 5%, the allow-able maximum error of synchronous motion is 0.02 mm.Then, based on the focusing mechanism , we deduce the formula of synchronous motion error and calculate that the maximum error of synchronous motion is 0.015 mm.Finally, the actual errors of synchronous motion before and after a vibration test are measured to be 0.012 mm and 0.013 mm respectively , which indicates that the focusing mechanism has great stability .Both the theoretical analysis and the experiments demonstrate that this focusing mechanism meets the requirements of practical application quite well .