Tschunko H F
Appl Opt. 1974 Aug 1;13(8):1820-3. doi: 10.1364/AO.13.001820.
Images formed by aberration free optical systems with annular apertures are investigated in the whole range of central obstruction ratios. Annular apertures form images with central and surrounding ring groups, and the number of rings in each group is given by the outer diameter of the annular aperture divided by the width of the annulus. The theoretical energy fraction of 0.838 in the Airy disk of the unobstructed aperture increases to 0.903 in the central ring groups. Furthermore it is shown that the energy fractions for the central and surrounding ring groups are constant for all obstruction ratios and in each fractional energy level. The central image spot in the central ring group contains only a small energy fraction and therefore the central ring group as a whole is the effective image element.
研究了具有环形孔径的无像差光学系统在整个中心遮挡比范围内所形成的图像。环形孔径形成的图像具有中央和周围的环组，每组中环的数量由环形孔径的外径除以环带宽度得出。无遮挡孔径的艾里斑中理论能量分数0.838在中央环组中增加到0.903。此外还表明，对于所有遮挡比以及每个分数能量水平，中央和周围环组的能量分数都是恒定的。中央环组中的中央图像光斑仅包含一小部分能量，因此整个中央环组是有效的图像元素。
