Processing thermography images for pitting corrosion quantification on small diameter ductile iron pipe

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DOIResolve DOI: http://doi.org/10.1016/j.ndteint.2012.01.003
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TypeArticle
Journal titleNDT & E International
ISSN09638695
Volume47
Pages105115
SubjectThermography; Image feature extraction; Corrosion quantification; Pipe condition assessment
AbstractThe condition of a metallic pipe is determined mainly by the extent to which it is corroded. Thus, the quantification of pitting corrosion in terms of metal loss is required for the understanding of pipe condition. There are different ways to quantify corrosion pit geometry. Direct methods measure the pit depth of pipe samples, which are sand/grit blasted to remove corrosion products, and are often adopted in laboratory. Indirect methods employ non-destructive inspection techniques to detect and quantify the corrosion without sandblasting, which is preferred for field test. In this study, the pulsed thermography is considered for fast quantification of pitting corrosion in a ductile iron pipe, which is sandblasted. The thermography testing generates a sequence of infrared images, which reflect the diffusion process of heat through pipe wall. This paper proposes a processing procedure to extract the corrosion information from the thermography images with phase congruency measurement and local binary fitting. The extracted feature is further related to the corrosion damage. Among all the features, the second principal component demonstrates a reasonably good linear relationship with metal loss of the pipe. The application potential is demonstrated by the experimental results.
Publication date
LanguageEnglish
AffiliationConstruction; Aerospace; National Research Council Canada
Peer reviewedYes
IdentifierS0963869512000059
NPARC number21268825
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Record identifier5626b1b6-5394-41ba-bbf7-bf0e180a9be8
Record created2013-11-14
Record modified2016-05-09
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