无损检测 工业X射线系统中焦点的特征 第3部分：小型和微焦点X射线管有效焦点尺寸的测量 (ISO 32543-3:2026)

[中文适用范围]： 本标准规定了测量管电压不超过225 kV的X射线系统、焦点尺寸在5 µm至300 µm范围内的测量方法。该方法基于使用标准焦点边缘影像采集的图像，并通过数字方法进行评价来确定焦点尺寸。X射线图像成像质量与分辨率在很大程度上取决于有效焦点的特性，尤其是其尺寸以及从探测器平面观察到的二维强度分布。在对商用X射线管类型进行表征（例如用于广告宣传或贸易）时，建议优先采用附录A中的标称值。注：经双方约定，相同程序亦可应用于更高管电压，但测量精度可能有所下降。 [外文原描述]： This document specifies a method for the measurement of focal spot sizes within the range of 5 µm to 300 µm of X-ray systems up to and including 225 kV tube voltage. This determination is based on the evaluation of an image with a dedicated focal spot that has been radiographically recorded using an edge and evaluated with a digital method. The imaging quality and the resolution of X-ray images depend highly on the characteristics of the effective focal spot, in particular its size and the two-dimensional intensity distribution as seen from the detector plane. For the characterization of commercial X-ray tube types (i.e. for advertising or trade), the nominal values of Annex A are p referred. NOTE The same procedure can be used at higher kilovoltages by agreement but the accuracy of the measurement can be poorer.