...形成的张角越大，可以进入物镜的光线越多，根据衍射 (diffraction) 理论，这代表点光源因衍射形成的 衍射环 ( diffraction rings ) 很狭窄和集中，衍射的影响小，显微镜的分析能力 (resolving power) 自然提高。
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Diffraction ring detection 衍射环检测
eye diffraction ring observation 目视衍射环观测
electronic backscatter ring diffraction 电子背散射衍射花样
In Fraunhofer diffraction area, the spot center is light spot, around encircle light and dark ring.
在夫琅和费衍射区域内，光斑图像中央是亮光斑，周围环绕着明暗交替的圆环。
The zoning rules for two dimensional ring of Frensel zone plate is studied by means of Kirchhoff diffraction formula.
从基尔霍夫绕射公式出发进一步研究菲涅耳区板的二维圆环的分区规则。
Considering diffraction effect based on scalar theory, we deduced a formula for point spread function of the coded aperture and discussed the ring coded aperture in detail.
基于标量衍射理论，考虑衍射效应的条件下，从理论上推导了编码孔径点扩散函数的公式，并对环形编码孔径进行了详细的讨论。
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