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Analysis and comparison of the surface filtering characteristics of computed tomography and tactile measurementsMario Salzinger, Peter Hornberger, Jochen HillerFraunhofer Application Center for Computed Tomography in Metrology CTMT, Deggendorf, Germany, e-mail: mario.salzinger@iis.fraunhofer.de, peter.hornberger@iis.fraunhofer.de, jochen.hiller@iis.fraunhofer.deAbstractThe use of industrial computed tomography for dimensional measurements is still met with considerable suspicion because of the numerous factors that influence the measurement uncertainty, which thus is hardly describable by a mathematical model. As a consequence, reference measurements with a tactile coordinate measuring machine (CMM) are usually performed. Image unsharpness when using computed tomography (CT) can be seen as low pass filter and therefore is one among many factors that influence the metrological performance of a CT system. However, it is also known that the geometry of the probe tip acts as a mechanical filter when using tactile CMMs. The studies in this work are performed with the help of a simple specimen which includes a number of surfaces of different waviness and roughness. Capturing the surfaces using both systems and comparing the results allows a deeper analysis and understanding of the filtering effects. The measurements are performed with probe balls of different diameters on a CMM. TheCT measurements are performed using various spatial resolution settings, resulting in different surface filtering characteristics. Additionally, surface measurements using a stylus instrument are performed. The comparison of these measurements shows that the CMM is more accurate when measuring form deviations of higher order. However, it also shows that the metrological performance, when measuring dimensional and geometrical measurands using the two systems, is comparable in many cases. Keywords: CMM, CT, metrology, roughness, surface, waviness

Digital Maschinenbau und Mechatronik

Beitrag (Sammelband oder Tagungsband)

Mario Salzinger, Jochen Hiller, Peter Hornberger

Bewertung technischer Oberflächen mit Röntgen-Computertomographie

Leitfaden zur Inspektion und Charakterisierung von Oberflächen mit Bildverarbeitung, Stutgart, vol. 16

2016

ISBN: 978-3-8396-1097-8

Digital Maschinenbau und Mechatronik

Zeitschriftenartikel

Jochen Hiller, Peter Hornberger

Measurement accuracy in X-ray computed tomography metrology: Toward a systematic analysis of interference effects in tomographic imaging

Precision Engineering, vol. 45, no. July, pp. 18-32

2016

DOI: 10.1016/j.precisioneng.2015.12.003

Abstract anzeigen

In this paper an investigation of interference effects leading to limitations of metrological performance of X-ray computed tomography (CT) used as a coordinate measuring technique is presented. Using reconstruction data, image quality metrics, and calculations of artifact formation, a deeper understanding and explanation of the physical and technical limitations of CT used in dimensional metrology is given. This is demonstrated in a case study using a simple hollow cylinder made of steel as a test object and calibration measurements from a tactile coordinate measuring machine (CMM). Two different threshold determination strategies for surface computation are applied. Within the study it is also shown that CT image properties, threshold determination strategies, and systematic and random measurement errors must have a definite correlation. As a conclusion it is recommended to focus more strongly on the correlation of local CT image quality and data evaluation operations in order to reduce systematic errors in surface computation and to increase repeatability of dimensional CT measurements.

Digital Maschinenbau und Mechatronik

Beitrag (Sammelband oder Tagungsband)

S. Zabler, Jochen Hiller, Simon Rettenberger, Peter Hornberger, A. Tissen

Messtechnik und Materialprüfung an belasteten Bauteilen mit In-situ-Computertomographie

Leitfaden zur industriellen Röntgentechnik, vol. 15

2015

ISBN: 978-3-8396-0913-2

Digital Maschinenbau und Mechatronik

Beitrag (Sammelband oder Tagungsband)

Christian Aichinger, Jochen Hiller, Peter Hornberger

Dimensionelles Messen mit Computertomographie

Leitfaden zur industriellen Röntgentechnik, vol. 15

2015

ISBN: 978-3-8396-0913-2

Maschinenbau und Mechatronik

Zeitschriftenartikel

S. Zabler, Jochen Hiller, B. Baudrit, S. Horlemann, Peter Hornberger, A. Tissen

Dimensionelles Messen und Materialprüfung an belasteten Bauteilen mit In-situ-CT

inspect, vol. 15, no. 4, pp. 54-56

2014

Abstract anzeigen

Die Anwendung der Röntgen-Computertomographie (CT) als zerstörungsfreie Prüfung (zfP) entwickelt sich zunehmend zu einem unverzichtbaren bildgebenden Verfahren in der Qualitätssicherung. Seit dem letzten Jahrzehnt wird diese Technologie verstärkt auch in der dimensionellen Messtechnik eingesetzt.

Digital Maschinenbau und Mechatronik

Zeitschriftenartikel

Peter Hornberger

Die Wolfgang Pfeiffer Stiftung an der Hochschule Deggendorf

Technik in Bayern: Nachrichten aus Technik, Naturwissenschaft und Wirtschaft (VDI Bezirksverein München, Obb. u. Ndb.), no. 5

2009

Maschinenbau und Mechatronik

Beitrag (Sammelband oder Tagungsband)

Peter Hornberger

Die Wolfgang Pfeiffer Stiftung an der Hochschule Deggendorf

Technik in Bayern, vol. 5

2009