Error and limit determination for dimensional measurements of thin-walled structures with industrial computed tomography
CHEN Zi-mu1,2,3, HU Zheng-wei1,2,3, WANG Qian-ni1,2,3, SHI Yi-wei1,2,3
1. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing 100095, China;
3. Key Laboratory of Aeronautical Materials Testing and Evaluation, Aero Engine Corporation of China, Beijing 100095, China
Abstract：Due to the high-accuracy requirement of dimensional measurements for thin-walled structures of additive manufacturing products, the grayscale distribution of the industrial CT image and the location of the structural boundaries in the image space were derived. In addition, the validity of the half-height-width method and the maximum gradient method was compared and analyzed, and the limit of the dimensional measurement based on CT imaging was calculated. The thin-walled structures with different thicknesses were calibrated, and measured by industrial CT scanning and imaging experiment. The results show that the half-height-width method generates a smaller error compared with the maximum gradient method, when the thickness of the thin-walled structures is larger than the measurement limit of the CT system. Finally, the measurement limit can be obtained by numerical simulations based on the edge spread function with experimental measurements.
陈子木, 胡正伟, 王倩妮, 史亦韦. 薄壁结构工业CT尺寸测量误差与极限[J]. 材料工程, 2020, 48(8): 169-176.
CHEN Zi-mu, HU Zheng-wei, WANG Qian-ni, SHI Yi-wei. Error and limit determination for dimensional measurements of thin-walled structures with industrial computed tomography. Journal of Materials Engineering, 2020, 48(8): 169-176.
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2020, Vol. 48 
