Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.722908
Title: An investigation of the factors associated with the X-ray tube and their influence on dimensional measurement in micro-focus cane-beam industrial X-ray computed tomography systems
Author: Flay, Nadia
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 2016
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Abstract:
In recent years, X-ray computed tomography (XCT) has successfully entered the field of dimensional metrology. XCT offers advantages over traditional tactile and optical coordinate measuring machines because of its ability to detect both the outer and inner geometries of an object. Due to the complex nature of XCT, there are a large number of factors which can influence dimensional measurement; many of these factors are still poorly understood. The novel study of a number of influence factors associated with the X-ray tube and their influence on dimensional measurement in micro-focus cone-beam XCT systems is presented in this thesis. The influence factors investigated in this study are the positional stability of the focal spot, the off-focal radiation, the focal spot size and the focal spot shape. The necessary background information to X-ray physics, XCT technology and dimensional metrology is discussed. The analysis of these influence factors was conducted at the National Physical Laboratory using experimental and computer simulation techniques. The experimental part of this research was carried out on Nikon Metrology XT H 225 M, with simulations performed using bespoke computer codes. The results of the study show that the positional stability of the focal spot, the off-focal radiation, the focal spot size and shape can all affect dimensional measurement. It is, therefore, proposed to include these parameters as part of the future standardised X-ray tube qualification and performance verification procedures of XCT systems. The evaluation techniques developed during the study can be employed as part of these standardised procedures. In addition, based on the findings of the study a number of future areas of research are proposed.
Supervisor: Blumensath, Thomas Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.722908  DOI: Not available
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