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Induction and conduction thermography. Optimizing the electromagnetic excitation towards application

: Vrana, J.; Goldammer, K.; Rothenfusser, M.; Arnold, W.

Postprint urn:nbn:de:0011-n-1299040 (3.0 MByte PDF)
MD5 Fingerprint: 69598a8e834b796620ed1f3d342d979a
Copyright AIP
Created on: 9.7.2010

Thompson, D.O. ; American Institute of Physics -AIP-, New York:
Review of progress in quantitative nondestructive evaluation. Volume 28, Vol. A : The Annual Review of Progress in Quantitative NDE (QNDE), Chicago, Illinois, 20 - 25 July 2008
Melville/NY: AIP, 2009 (AIP Conference Proceedings 1096)
ISBN: 978-0-7354-0629-2
ISSN: 0094-243X
Annual Review of Progress in Quantitative Nondestructive Evaluation (NDE) <35, 2008, Chicago/Ill.>
Conference Paper, Electronic Publication
Fraunhofer IZFP ()
thermography; induction efficiency; current density

Active thermography, using electromagnetic excitation, allows detecting defects like cracks which distort the flow of current in the component under examination. Like other thermography techniques it is rapid and reliably utilizing infrared imaging. Electric current can be used in two ways for thermography: In induction thermography a current is coupled to the component by passing an AC current through a coil which is in close proximity to the component inspected, while in conduction thermography the current is coupled directly into the component. In this paper, the specific advantages of both coupling methods are discussed, including the efficiency of the coupling and optimization strategies for testing and also the necessary algorithms required to analyze the data. Taking these considerations into account a number of different systems for laboratory and practical application were developed.