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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

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
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
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.
University of Southampton
Flay, Nadia
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Flay, Nadia
d356a6bf-6acf-4b16-8924-3603d0b7a4eb
Blumensath, Thomas
470d9055-0373-457e-bf80-4389f8ec4ead

Flay, Nadia (2016) 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. University of Southampton, Doctoral Thesis, 185pp.

Record type: Thesis (Doctoral)

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.

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Published date: July 2016

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Local EPrints ID: 414010
URI: http://eprints.soton.ac.uk/id/eprint/414010
PURE UUID: 4d47826e-4c20-45cf-927e-e44c51482c9e

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Date deposited: 12 Sep 2017 16:31
Last modified: 29 Jan 2020 12:30

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