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Determination of the measurement uncertainty and of the measurement capability of computed tomography scanners in dimensional metrologyThe PTB helps provide the bases for a highly developed metrological infrastructure, which is a prerequisite for general quality assurance. It is an important objective of PTB activities to support in this way the competitiveness of industry. Against this background, the company Rautenbach-Aluminium-Technologie GmbH in Wernigerode and the Department for Coordinate Measuring Technology and Measuring Instruments Technology of the PTB in Braunschweig have started a joint project aiming to investigate the metrological capabilities of industrial computed tomography for dimensional quality assurance.
By computed tomography using X-rays (figure) it is possible to look inside motor components to ascertain dimensions of wall thicknesses or the location of structures without cutting this part open and thus destroying it. While in medicine the information gathered has up to now mostly been evaluated in qualitative terms, here the dimensions of the internal component geometry in accordance with the tolerances have to be determined with sufficient accuracy. The questions to be clarified are the measurement uncertainty of computed tomography and the suitability of using it to solve the new tasks with the accuracy required. Furthermore, procedures will be developed which allow computed tomography systems to be accepted and routinely checked in order to ensure the quality of the measurements also from economic aspects over a long period of time. The PTB will investigate these questions together with Rautenbach. The solutions found in the project which is scheduled to take two years will contribute to helping meet the requirements of the relevant standards (e.g. DIN EN ISO 9001 or the guidelines of the Association of the Automotive Industry VDA 6.1, VDA 5) which require just this determination of the measurement uncertainty. On the other hand, the project results will build confidence in the use of computed tomography in industrial quality assurance. Project partner: Fa. Rautenbach-Aluminium-Technologie GmbH Ansprechpartner: Dr. rer. nat. Markus Bartscher
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