The University of Southampton
University of Southampton Institutional Repository

On the uncertainty of surface determination in x-ray computed tomography for dimensional metrology

On the uncertainty of surface determination in x-ray computed tomography for dimensional metrology
On the uncertainty of surface determination in x-ray computed tomography for dimensional metrology
With x-ray computed tomography (CT) it is possible to evaluate the dimensions of an object’s internal and external features non-destructively. Dimensional measurements evaluated via x-ray CT require the object’s surfaces first be estimated; this work is concerned with evaluating the uncertainty of this surface estimate and how it impacts the uncertainty of fitted geometric features. The measurement uncertainty due to surface determination is evaluated through the use of a discrete ramp edge model and a Monte Carlo simulation. Based on the results of the Monte Carlo simulation the uncertainty structure of a coordinate set is estimated, allowing individual coordinate uncertainties to be propagated through the geometry fit to the final measurement result. The developed methodology enables the uncertainty due to surface determination to be evaluated for a given measurement task; the method is demonstrated for both measured and simulated data.
x-ray computed tomography, dimensional metrology, surface determination, uncertainty, monte carlo, weighted least-squares
1361-6501
1-8
Lifton, J.J.
0382deb4-709b-412d-9555-a14740738263
Malcolm, A.A.
d78bb426-fde7-46bb-a2a8-d501fa4a1dd0
McBride, J.W.
d9429c29-9361-4747-9ba3-376297cb8770
Lifton, J.J.
0382deb4-709b-412d-9555-a14740738263
Malcolm, A.A.
d78bb426-fde7-46bb-a2a8-d501fa4a1dd0
McBride, J.W.
d9429c29-9361-4747-9ba3-376297cb8770

Lifton, J.J., Malcolm, A.A. and McBride, J.W. (2015) On the uncertainty of surface determination in x-ray computed tomography for dimensional metrology. Measurement Science and Technology, 26 (3), 1-8. (doi:10.1088/0957-0233/26/3/035003).

Record type: Article

Abstract

With x-ray computed tomography (CT) it is possible to evaluate the dimensions of an object’s internal and external features non-destructively. Dimensional measurements evaluated via x-ray CT require the object’s surfaces first be estimated; this work is concerned with evaluating the uncertainty of this surface estimate and how it impacts the uncertainty of fitted geometric features. The measurement uncertainty due to surface determination is evaluated through the use of a discrete ramp edge model and a Monte Carlo simulation. Based on the results of the Monte Carlo simulation the uncertainty structure of a coordinate set is estimated, allowing individual coordinate uncertainties to be propagated through the geometry fit to the final measurement result. The developed methodology enables the uncertainty due to surface determination to be evaluated for a given measurement task; the method is demonstrated for both measured and simulated data.

This record has no associated files available for download.

More information

Accepted/In Press date: 12 November 2014
e-pub ahead of print date: 12 November 2014
Published date: 16 February 2015
Keywords: x-ray computed tomography, dimensional metrology, surface determination, uncertainty, monte carlo, weighted least-squares
Organisations: Mechatronics

Identifiers

Local EPrints ID: 374631
URI: http://eprints.soton.ac.uk/id/eprint/374631
ISSN: 1361-6501
PURE UUID: 1cfc2345-93b0-42af-9a9f-80f74ed1b97e
ORCID for J.W. McBride: ORCID iD orcid.org/0000-0002-3024-0326

Catalogue record

Date deposited: 24 Feb 2015 09:51
Last modified: 15 Mar 2024 02:39

Export record

Altmetrics

Contributors

Author: J.J. Lifton
Author: A.A. Malcolm
Author: J.W. McBride ORCID iD

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×