Mekler Y, Otterman J, Ravnoy Z
Appl Opt. 1975 Feb 1;14(2):503-8. doi: 10.1364/AO.14.000503.
Various aspects of diffraction effects on imagery from distributed sources are studied. First the irradiance distribution in the focal plane from distributed, uniform, circular sources (disks) for optical systems with various obscuration ratios, was computed and presented in tables. A resolution criterion, applicable both to point sources and distributed sources, is presented and discussed. The criterion is based on an assumption that detection requires a minimum contrast. The level of this contrast was selected to be 20%. The criterion is applied to the case of two neighboring disks, and the numerical results for resolution are tabulated. The problem of size estimate, i.e., apparent diameter of a single disk on a uniform background, is treated as a question of locating points the irradiance at which is a specified level higher than the background. The real (geometric optics) diameter of a source is given in graphs in terms of its apparent size.
研究了衍射效应在分布式源成像方面的各个方面。首先，计算了具有不同遮拦比的光学系统中分布式、均匀圆形源（圆盘）在焦平面上的辐照度分布，并以表格形式呈现。提出并讨论了一种适用于点源和分布式源的分辨率判据。该判据基于检测需要最小对比度这一假设。将此对比度水平选定为20%。该判据应用于两个相邻圆盘的情况，并将分辨率的数值结果制成表格。尺寸估计问题，即在均匀背景上单个圆盘的视直径问题，被视为确定辐照度比背景高指定水平的点的问题。源的实际（几何光学）直径以视尺寸的形式在图表中给出。
