基于工业CT直径测量的不确定度评估技术研究

Uncertainty evaluation of diameter measurement based on industrial CT

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 diameter is not traceable and the uncertainty component is difficult to be quantified,the main error source of industrial CT measurement diameter was simplified and the uncertainty model of industrial CT measurement was established. According to GUM method,the transfer factor of the main error source was obtained. Finally,the calibrated ？12 mm diameter block was measured and evaluated by a high energy 6 Me V industrial CT linear array detector system. When the confidence interval is 95%,the extended uncertainty of the measured diameter is 0.08 mm,and it has a reliable theoretical basis and a more stable assessment of the results. This uncertainty assessment method can be used for various diameter measurements in combination with the actual measurement system.