Imperial College London
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ProfessorMichaelLowe

Faculty of Engineering, Department of Mechanical Engineering

Head of Department of Mechanical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 7000m.lowe Website

 
 
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Assistant

 

Ms Nina Hancock +44 (0)20 7594 7068

 
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Location

 

577DCity and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Haith:2016:10.1016/j.ndteint.2016.11.006,
author = {Haith, MI and Ewert, U and Hohendorf, S and Bellon, C and Deresch, A and Huthwaite, P and Lowe, MJS and Zscherpel, U},
doi = {10.1016/j.ndteint.2016.11.006},
journal = {NDT & E INTERNATIONAL},
pages = {113--122},
title = {Radiographic modelling for NDE of subsea pipelines},
url = {http://dx.doi.org/10.1016/j.ndteint.2016.11.006},
volume = {86},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This work presents an investigation of the accuracy of a radiographic simulation model applied to subsea pipeline inspections. Experimental measurements of a sample in a water tank are used to develop a set of calibrated simulation parameters for the modelling software aRTist. Image quality parameters such as signal-to-noise ratio, contrast and basic spatial resolution are compared with the aim of matching simulated values to experimental results. With this method signal-to-noise ratio was successfully matched while differences were still found in contrast-to-noise ratio comparisons. This means that measurements depending on absolute intensity are not accurate enough, however wall thickness measurements in tangential images, which are not based on absolute intensity, were found to produce similar results in simulated and experimental cases. The differences in contrast and intensity are thought to be due to detector backscatter and additional scatter from out-of-setup objects within the exposure bay, due to a lack of source collimation. These would affect the experimental results but were not included in the simulated setup. This was investigated by including different proportions of peripheral water and other objects in the modelled setup and examining the effect on image quality parameters. Results show that this additional scatter has a significant impact on the radiograph, particularly on image contrast, and is therefore the likely cause of differences between experimental and simulated images. This implies that it will be very difficult to completely match simulated to experimental results, as including all possible scattering objects in the model would be very complex. An improvement could be made by using real subsea data to estimate this additional scattering, which could then be used to calibrate the model. However there would still be significant uncertainty in the ability of the model to accurately produce realistic intensity and contrast.
AU  - Haith,MI
AU  - Ewert,U
AU  - Hohendorf,S
AU  - Bellon,C
AU  - Deresch,A
AU  - Huthwaite,P
AU  - Lowe,MJS
AU  - Zscherpel,U
DO  - 10.1016/j.ndteint.2016.11.006
EP  - 122
PY  - 2016///
SN  - 0963-8695
SP  - 113
TI  - Radiographic modelling for NDE of subsea pipelines
T2  - NDT & E INTERNATIONAL
UR  - http://dx.doi.org/10.1016/j.ndteint.2016.11.006
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000393628000015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/45747
VL  - 86
ER  -
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