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Accuracy of the element geometry mapping using non-invasive computer tomography method

Grzelka M., Marciniak L., Gapinski B., Budzik G., Trafarski A., Augustyn-Pieniazek J., Gaca M.

Journal of Automation Mobile Robotics and Intelligent Systems

2012

Vol. 6, No. 3

23-26

Non-invasive method of the measurement and identification of shape and geometrical characteristics of measured detail based on the computer tomograph is widely applied in medicine with high efficiency. The paper is aimed at presenting the metrological analysis of the accuracy of shape reproduction. The examined shape was described due to the tomography and compared to the results of coordinate measurement. The comparative accuracy analysis of the tomography was performed for the typical details, as well as for the masters made with high accuracy. Using the results of the analysis, the respective models of measured details were created and used as a nominal in the further investigations. The results of the measurement with tomography were compared with the results achieved from the measurement by means of typical coordinate measuring machines and by means of 3D measurement optical scanner. Analysis of the gained values of the form deviations and important geometrical characteristics enabled to perform complex analysis of the shape reproduction of the examined detail with the method of computer tomography. The main purpose of the performed researches was the determination of the reproduction accuracy of surface measured with non-invasive computer tomography method. The investigations and analysis have been performed with the following equipment: computer tomograph, 3D printer and coordinate optical scanner supported with specialized software for advanced CAD data analysis.

The use of optical scanning for analysis of casting shape

Wieczorowski M., Grzelka M., Budzik G., Augustyn-Pieniazek J.

Archives of Foundry Engineering

2011

Vol. 11, iss. 2 spec.

217--221

In the paper the use of optical scanning for inspection of casting shape and its accuracy was described. Optical system applied to digitization of objects determines all dimensions and shape of inspected object. This technology is used in quality control and reverse engineering. System is based on triangulation: sensor head performs projection of different patterns of fringes onto measured object and scanner tracks their distribution with two cameras. Basing on optical transform equations, a processing unit automatically and with remarkable accuracy calculates 3D coordinates for every pixel of camera. Depending on camera resolution the result of such a scan is a cloud of points with up to 5 million points for every image. In the paper examples of applications for castings with different designation was presented.

W artykule opisano wykorzystanie skanowania optycznego do kontroli dokładności wykonania odlewów. System optyczny stosowany do digitalizacji obiektów określa wszystkie wymiary i kształt badanego przedmiotu. Technologia ta wykorzystywana jest w kontroli jakości i w inżynierii odwrotnej. System bazuje na zasadzie triangulacji: głowica sensora dokonuje projekcji różnych układów prążków na obiekt mierzony a skaner obserwuje ich przebieg dwoma kamerami. Opierając się na równaniach transformacji optycznej, jednostka przetwarzająca automatycznie i z dużą dokładnością oblicza współrzędne 3D dla każdego piksela kamery. Zależnie od rozdzielczości kamery, wynikiem takiego skanu jest chmura do 4 milionów punktów dla każdego pojedynczego pomiaru. W artykule pokazano przykładowe zastosowanie skanera optycznego do pomiarów odlewów o różnym przeznaczeniu.