A noncontacting thermal NDE technique has been developed which employs a moving line heat source and is capable of imaging defects in thin aluminum structures such as aircraft lap joints. This technique has been shown to effectively detect thinning in thin steel laboratory samples designed to determine the spatial resolution of the system. A steady state solution for the induced thermal change in the plate is presented. When the steady state condition is achieved, the induced temperature change is inversely proportional to the thickness of the material at an observation point more than one thickness of the plate behind the linear source. A more critical constraint on thickness measurement with this technique is the time or distance required to achieve the steady state condition. The experimental results are in good agreement with theoretical results and indicate the difficulty of mapping the thickness of a plate with measurements using a single observation point.
Thermographic detection and quantitative characterization of corrosion by application of thermal line source
Thermischer Nachweis und quantitative Charakterisierung von Korrosion mit Hilfe von thermischen Linienquellen
1998
10 Seiten, 11 Bilder, 5 Quellen
Aufsatz (Konferenz)
Englisch
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