Crack imaging by scanning pulsed laser spot thermography

Teng Li, Darryl P Almond, D Andrew S Rees

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

A new crack imaging technique is presented that is based on second derivative image processing of thermal images of laser heated spots. Experimental results are shown that compare well with those obtained by the dye penetrant inspection method. A 3D simulation has been developed to simulate heat flow from a laser heated spot in the proximity of a crack. A 'ghost point' method has been used to deal efficiently with cracks having openings in the micometre range. Results are presented showing the effects of crack geometry and system parameters on thermal images of laser heated spots.
Original languageEnglish
Pages (from-to)117-123
Number of pages7
JournalNDT and E International
Volume18
Issue number1
DOIs
Publication statusPublished - Jan 2011

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Pulsed lasers
pulsed lasers
cracks
Cracks
Scanning
Imaging techniques
scanning
crack geometry
penetrants
lasers
Lasers
ghosts
heat transmission
imaging techniques
image processing
proximity
inspection
dyes
Image processing
Coloring Agents

Cite this

Crack imaging by scanning pulsed laser spot thermography. / Li, Teng; Almond, Darryl P; Rees, D Andrew S.

In: NDT and E International, Vol. 18, No. 1, 01.2011, p. 117-123.

Research output: Contribution to journalArticle

Li, Teng ; Almond, Darryl P ; Rees, D Andrew S. / Crack imaging by scanning pulsed laser spot thermography. In: NDT and E International. 2011 ; Vol. 18, No. 1. pp. 117-123.
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