Evaluation method of measurement accuracy for Industrial Computed Tomography
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摘要: 为了验证工业CT系统对检测件的测量精度，设计了一套评估方法，针对由国家X射线数字化成像仪器中心自主研发的9 MeV 高能工业CT系统和450 kV工业CT系统，设计制作了标准测量试块，以三坐标测量机为辅助测量手段，对CT图像的线性尺寸、球面尺寸、角度尺寸、孔径尺寸和定位尺寸等进行对比测量，得到不同尺寸类型的测量误差。在不考虑尺寸类型的影响下，分别对铝、不锈钢和尼龙三种材料做了CT测量误差对比，结果表明，对于这三种材料来说，材料密度越大测量精度越高。实验结果表明，可验证工业CT系统对不同类型尺寸测量的精度，工业CT系统可完成精度较高的尺寸测量工作，特别对复杂结构的内部尺寸测量有一定的优势。Abstract: In order to verify the measurement accuracy of Industrial Computed Tomography (ICT), an evaluation method was designed and the standard measuring parts were made for the 9 MeV high-energy industrial CT system and 450 kV industrial CT system which were produced by National X-ray Digital Imaging Instrument Centre. The liner dimensions, the sphere diameters, the angle values, the apertures and the positioning dimensions were measured by CMM and CT system .Then comparing the results, after data analysis, different errors for these dimensions were acquired. For different materials of aluminum, nylon and stainless steel, higher density material with higher density has less measure error without considering the effect of the dimension type. These results validate the ability of industrial CT system as a high dimensional measuring machine for nondestructive examination.
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Key words:
- Industrial Computed Tomography /
- dimensional measurement /
- accuracy /
- verification &
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