Toraldo光瞳滤波器对光学系统成像分辨率的影响

Influence of Toraldo Pupil-filter on Imaging Resolution of Optical System

摘要:

研究Toraldo光瞳滤波器横向、轴向及三维成像分辨率与滤波器结构参数的关系，推导出各分辨率与两区及三区漏光环型Toraldo光瞳滤波器环型区域的遮挡率和透过率之间的解析表达式，并给出它们的关系曲线图。二区漏光环型光瞳滤波器横向分辨率随中心透过率的减小而增大，一般情况下轴向分辨率随中心透过率的增大而增大。三区漏光环型光瞳滤波器横向超分辨率要求中心透过率低，而轴向超分辨率要求中间的透过率比两边低。可设定不同的透过率和遮挡率来分别实现横向、轴向及三维成像超分辨率。

Abstract:

The relation between the resolutions of transverse,axial and three-dimensional(3D) of Toraldo pupil-filter and the parameters of pupil-filter systems were discussed.The analytical formulas expressed the interaction of the resolutions and the obscuration ratio and transmissivity of the two zone and three zone leaky annular pupil filters were derived and plotted.The transverse resolution of two zone leaky annular pupil filter increases with the central transmissivity decreasing,and in common cases axial resolution increases with the central transmissivity increase.The transverse superresolution of three zone leaky annular pupil filter requires the lower central transmissivity,and the axial superresolution requires the lower transmissivity of middle annular region.So we can accurately assume the obscuration ratio and transmissivity of pupil-filter to achieve the transverse,axial,and three-dimensional superresolutions of the imaging optical system.