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为解决工业CT直径测量值缺乏溯源性、不确定度成分难以量化的问题,对工业CT测量直径结果的主要误差源进行合理简化,建立工业CT测量不确定度评定模型,根据GUM法得到各个主要误差源的传递因数。最后,以高能6 Me V工业CT线阵探测器系统对已校准的?12 mm直径量块进行测量及评价实验。置信区间为95%时,评定直径测量的扩展不确定度为0.08 mm,具有可靠的理论依据和较稳定的评定结果。此不确定度评估方法可结合实际测量系统在各种直径测量中进行推广使用。
In order to solve the problem that the measurement value of industrial CT is not traceable and the components of uncertainty are difficult to quantify, the main error sources of diameter measurement results of industrial CT are reasonably simplified. The evaluation model of industrial CT measurement uncertainty is established. According to GUM method, The error source of the transfer factor. Finally, the measurement and evaluation experiment of the calibrated 12mm diameter block was carried out with a high-energy 6 MeV industrial CT linear detector system. When the confidence interval is 95%, the extended uncertainty of the measured diameter measurement is 0.08 mm, which has a reliable theoretical basis and a more stable assessment result. This uncertainty assessment method can be used in conjunction with actual measurement systems in various diameter measurements.