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| Exploratory Research on the Length Measuring Error Calibration of Industrial CT |
| SONG Xu1, SHI Yu-shu2,3, SONG Xiao-ping2, LI Dong-sheng1, CHEN Si-wen3, LI Shi2, GAO Si-tian2 |
1. College of Metrological Technology and Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China;
2. National Institute of Metrology, Beijing 100029, China;
3. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China |
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Abstract An exploratory research on the length measuring error calibration of industrial CT is carried out to move forward on the traceability of industrial CT in dimensional measurement. The length measuring error of industrial CT can be classified to two types: sphere distance error and plane distance error. For the widely accepted sphere distance error, a tiny forest-ball is developed, and calibrated by a high precision coordinated measuring machin. Then the tiny forest-ball is used to calibrate an industrial CT called Metrotom 1500, the sphere distance error is smaller than ±2 μm, and smaller than the maximum permissible error of this machine. For the plane distance error, an exploratory experiment is conducted with steel gauge blocks and ceramic gauge blocks, and the plane distance error is out of the maximum permissible error. The experiment result shows that it is very different to calibrate the length measuring error of industrial CT by sphere distance and plane distance, and the plane distance error is much larger than sphere distance error when measuring a same length.
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［1］Schmitt R, Niggemann C. Uncertainty in measurement for x-ray-computed tomography using calibrated work pieces［J］. Measurement Science and Technology, 2010, 21(5): 054008.
［2］Kruth J P, Bartscher M, Carmignato S, et al. Computed tomography for dimensional metrology［J］. CIRP Annals-Manufacturing Technology, 2011, 60(2): 821-842.
［3］陈思,陈浩,李敬.一种工业CT测量精度评估方法［C］//全国射线数字成像与CT新技术. 绵阳,2012,189-197.
［4］Bartscher M, Neuschaefer-Rube U, Staude A, et al. Application of an industrial CT reference standard for cast free-form shaped work pieces［C］// International Symposium on Digital Industrial Radiology and Computed Tomography, Berlin, Germany, 2011, 20-22.
［5］Kiekens K, Welkenhuyzen F, et al. A test object for calibration and accuracy assessment in X-ray CT metrology［C］// 10th International Symposium on Measurement and Quality Control 2010.Osaka, Japan, 2010.
［6］王义旭,施玉书,高思田,等. 工业CT探测尺寸误差的校准及误差分析［J］.计量学报,2014,35(3): 216-220.
［7］张朝宗,郭志平.工业CT技术和原理［M］.北京:科学出版社,2009, 125-127.
［8］Feldkamp L A, Davis L C, Kress J W. Practical cone-beam algorithm［J］. Journal of the Optical Society of America A, 1984, 1(6): 612-619.
［9］Prufstelle Testing and Certification Institute. VDI/VDE 2630, Computed Tomography in dimensional measurement［S］. 2011.
［10］Hubbell J H, Seltzer S M. Tables of X-Ray Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients from 1 keV to 20 MeV for Elements Z=1 to 92 and 48 Additional Substances of Dosimetric Interest［EB］. http://www.nist.gov/pml/data/xraycoef/index.cfm, 2004.7. |
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2015, Vol. 36 
