针对工业CT系统在缺欠尺寸测量过程中的不确定度问题，对可能引起不确定度的误差源进行了分析，并基于GUM法对测量不确定度进行了研究。试验结果表明，所提出的分析方法可以满足工业CT系统对缺欠尺寸测量不确定度的评定要求，其中，测量过程中的误差、CT系统的空间分辨率、密度分辨率、平板探测器像素尺寸、系统误差等是对合成不确定度影响最大的因素。

Aiming at the uncertainty in the process of missing dimensional measurement in industrial CT systems, the error sources that may cause uncertainty are analyzed, and the measurement uncertainty is studied based on the GUUM method. The test results show that the proposed analysis method can meet the evaluation requirements of the uncertainties of missing dimensional measurement in industrial CT systems. Among them, the errors in the measurement process, the spatial resolution, the density resolution of the CT system, the pixel size of the plate detector, and the system error are the most important reasons for the synthesis uncertainty.