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Thermographic nondestructive evaluation: data inversion procedures: Part I: 1-D analysis

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1007/BF01577647
AuthorSearch for: 1; Search for: 1
Affiliation
  1. National Research Council of Canada. NRC Industrial Materials Institute
FormatText, Article
Subjectapply physic; thermal resistance; global minimization; biot; nondestructive evaluation
Abstract
A data inversion procedure is presented, for the one-dimensional case, to retrieve the subsurface defect depth and thermal resistance from the time evolution of the surface temperature distribution as recorded by a thermographic camera (thermal “defectometry”). The inversion algorithm is based on the global minimization of a specific functional (nonlinear least squares problem) through an iterational routine taking into account simultaneously all of the defect variables and their effects on the values of the observable parameters. Surface losses are included as an unknown Biot number in the inversion routine. This paper deals with one-dimensional thermal flow. Part II, in this same issue, covers the two-dimensional theory and the experimental results.
Publication date
PublisherSpringer
In
  • Research in Nondestructive Evaluation 3, no. 2 (June 1991): 81–100.
LanguageEnglish
Peer reviewedYes
NRC numberCNRC 33757
NRC-IMI-92AP-12100-1319-G
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Record created2023-12-05
Record modified2023-12-05
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