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Analysis of the effect of cone-beam geometry and test object configuration on the measurement accuracy of a computed tomography scanner used for dimensional measurement
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Kumar, Jagadeesha, Attridge, Alex, Wood, P. K. C. and Williams, M. A. (Mark A.) (2011) Analysis of the effect of cone-beam geometry and test object configuration on the measurement accuracy of a computed tomography scanner used for dimensional measurement. Measurement Science and Technology, Volume 22 (Number 3). Article: 035105. doi:10.1088/0957-0233/22/3/035105 ISSN 0957-0233.
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Official URL: http://dx.doi.org/10.1088/0957-0233/22/3/035105
Abstract
Industrial x-ray computed tomography (CT) scanners are used for non-contact dimensional measurement of small, fragile components and difficult-to-access internal features of castings and mouldings. However, the accuracy and repeatability of measurements are influenced by factors such as cone-beam system geometry, test object configuration, x-ray power, material and size of test object, detector characteristics and data analysis methods. An attempt is made in this work to understand the measurement errors of a CT scanner over the complete scan volume, taking into account only the errors in system geometry and the object configuration within the scanner. A cone-beam simulation model is developed with the radiographic image projection and reconstruction steps. A known amount of errors in geometrical parameters were introduced in the model to understand the effect of geometry of the cone-beam CT system on measurement accuracy for different positions, orientations and sizes of the test object.
Simulation analysis shows that the geometrical parameters have a significant influence on the dimensional measurement at specific configurations of the test object. Finally, the importance of system alignment and estimation of correct parameters for accurate CT measurements is outlined based on the analysis.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
| Library of Congress Subject Headings (LCSH): | Tomography, Engineering drawings -- Dimensioning, Measurement, Metrology | ||||
| Journal or Publication Title: | Measurement Science and Technology | ||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||
| ISSN: | 0957-0233 | ||||
| Official Date: | March 2011 | ||||
| Dates: |
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| Volume: | Volume 22 | ||||
| Number: | Number 3 | ||||
| Number of Pages: | 15 | ||||
| Page Range: | Article: 035105 | ||||
| DOI: | 10.1088/0957-0233/22/3/035105 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Advantage West Midlands (AWM), European Regional Development Fund (ERDF) |
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