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Effects of off-focal radiation on dimensional measurements in industrial cone-beam micro-focus X-ray computed tomography systems

Flay, N; Brown, S; Sun, W; Blumensath, T; Su, R (2020) Effects of off-focal radiation on dimensional measurements in industrial cone-beam micro-focus X-ray computed tomography systems. Precision Engineering, 66. pp. 472-481. ISSN 01416359

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Abstract

A novel study of the secondary focal spot phenomenon due to the presence of off focal radiation in industrial micro-focus cone-beam X-ray computed tomography systems and its influence on dimensional measurement is presented in this paper. Although the production of off-focal radiation within X-ray tubes is predicted theoretically, no literature discussing the properties of off-focal radiation and its effects on measurement in industrial XCT systems was identified prior to this research. The study comprised several parts: a) evaluation of geometrical properties of the secondary focal spot through 2D image analysis of scanned objects, b) verification of these properties using computer simulation techniques and c) evaluation of the effects of the secondary focal spot on dimensional measurement using real scans and simulated 3D models of spheres. In addition, ways to minimise the effects of off-focal radiation are discussed, procedures for analysing the properties of the secondary source of radiation are proposed and further possibilities for research are presented.

Item Type: Article
Subjects: Engineering Measurements > Dimensional
Divisions: Engineering
Identification number/DOI: 10.1016/j.precisioneng.2020.08.014
Last Modified: 27 Apr 2021 13:32
URI: http://eprintspublications.npl.co.uk/id/eprint/9090

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