Strathprints Home | Open Access | Browse | Search | User area | Copyright | Help | Library Home | SUPrimo

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

Kumar, Jagadeesha and Attridge, Alex and Wood, Paul and Williams, 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, 22 (3). 035105. ISSN 0957-0233

Full text not available in this repository. (Request a copy from the Strathclyde author)

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: Article
ID code: 30714
Keywords: cone-beam geometry, spatial dimentions, forming, moulding, computed tomography, Engineering design, Instrumentation, Applied Mathematics
Subjects: Technology > Engineering (General). Civil engineering (General) > Engineering design
Department: Faculty of Engineering > Design, Manufacture and Engineering Management
Related URLs:
Depositing user: Pure Administrator
Date Deposited: 05 May 2011 19:31
Last modified: 05 Sep 2014 08:32
URI: http://strathprints.strath.ac.uk/id/eprint/30714

Actions (login required)

View Item