【摘要】 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。更多还原

【Abstract】 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 synchorman 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 allowable 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. 015mm. Finally,the actual errors of synchronous motion before and after a vibration test are measured to be0. 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.更多还原