新型航空镜间快门对光学传递函数的影响分析  

Analysis of Influence on the New Type Aviation Lens Shutter to the Optical Transfer Function

作　　者：于春风[1] 丁亚林[1] 惠守文[1] 于帅北[1] 汪龙祺[1] 施龙[1] 远国勤[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所航空光学成像与测量重点实验室,吉林长春130033

出　　处：《光学学报》2014年第11期156-164,共9页Acta Optica Sinica

基　　金：国家高分重大专项(民用部分)航空系统项目(30-H32A01-9005-12/12);国家973计划(2009CB724001)

摘　　要：光学传递函数是评价光学系统成像质量的重要指标。基于为数字航空摄影相机设计的一种新型航空镜间快门的工作特性,镜间快门在控制曝光过程中改变了相机光学系统的光瞳形状,意味着点扩展函数的改变,从而改变了光学系统的传递函数。将光学系统视为一个空间频率的滤波器,以傅里叶积分变换和光的标量衍射理论为基础,将孔径光阑的变化过程与光瞳函数建立关系,应用二次傅里叶变换法得到光学传递函数,分析快门在工作周期内对光学传递函数的影响。通过对计算结果与测量结果的对比分析可知,传递函数的最大绝对误差为0.196,最大相对误差为-0.274,有较好的准确度和重复性,并且缩小镜间快门开始和关闭阶段所用时间占整个曝光时间的比例,可以提高系统的综合传递函数,为中心快门的优化设计提供理论依据。The optical transfer function is the important parameter to evaluate the image quality of optical system. Based on the working property of one new type aviation lens shutter designed for the digital aerial photograph camera, the analysis of influence on the optical transfer function is presented. The lens shutter can change the optical pupil shape of the camera＇s optical system in the processing of control exposure, which means the point spread function is changed. Thus the optical transfer function is also changed. The relationship between the variety of aperture stop and the optical pupil function is built up by taking the optical system as the spatial frequency filter and adopting the Fourier transfer method and scalar diffraction theory as the theoretical foundation to analysis the influence of the shutter in the working period on the optical transfer function. Through the comparing analysis of the calculation and measurement results, they show that the maximum absolute error is 0. 196 and the maximum relative repetitiveness. Furthermore, the design decreases the time ratio occupying whole error is -0. 274 for the optical transfer function, which has better accuracy and exposure time for the beginning stage of shutter and the closing stage of shutter. It improves the comprehensive transfer function of system, which provides the theoretical reference for the optimization design of center shutter.

关 键 词：傅里叶光学 新型镜间快门 光学传递函数 光瞳函数 傅里叶变换法 点扩展函数 

分 类 号：TP73[自动化与计算机技术—检测技术与自动化装置]