Defect sizing by transient thermography. I. An analytical treatment

Darryl P Almond, S K Lau

Research output: Contribution to journalArticlepeer-review


Thermal edge effects for crack-like defects have been calculated using the Wiener-Hopf technique. It is found that the crack surface temperature is reduced over a distance of a thermal diffusion length by heat flow around the crack edge to the cold underside of the crack. Surface thermal images have been computed for a straight-edged and a circular crack. Comparisons are presented of image profiles computed with and without inclusion of edge effects. Edge effects lead to the prediction that transient thermographic defect images should shrink with elapsed time. Experimental data are presented, which are in agreement with this prediction and demonstrate a simple means of defect sizing.
Original languageEnglish
Pages (from-to)1063-1069
Number of pages7
JournalJournal of Physics D: Applied Physics
Issue number5
Publication statusPublished - 14 May 1994


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