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Proceedings Paper

Square pulse thermography system design considerations for detection of voids inside of the material with different properties and finite differences
Author(s): Gerhard Traxler; Michael Scheerer; Christoph Steiger
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Paper Abstract

This work gives some practical, simulated and calculated design parameters for the detection of voids inside the material with active thermography for different void geometry, orientation and depths. Main goal is to find the limitations of detectability for different materials and voids, to help designers for test systems with: a quick estimation of the feasibility and to find the necessary camera parameters. The methods used (algebraic, numeric and practical) to find these values will be described. For inline applications the so called square pulse technique is easy to automate and needs less power from the source, because energy can be brought into the probe for a longer time span. Further its strength (in relation to flash pulse technique) is to find voids deeper below the surface. Therefore all of the calculations and practical verifications will be done only with square pulse. The finite difference calculations are used to get a quick approximation for the dimensioning parameters. Some hints how to work with this method and how to prevent errors will be given in this paper. Practical tests with artificial probes and known void properties will be done with some of the parameters to verify the calculated values.

Paper Details

Date Published: 24 February 2005
PDF: 11 pages
Proc. SPIE 5679, Machine Vision Applications in Industrial Inspection XIII, (24 February 2005); doi: 10.1117/12.585744
Show Author Affiliations
Gerhard Traxler, ARC Seibersdorf Research GmbH (Austria)
Michael Scheerer, ARC Seibersdorf Research GmbH (Austria)
Christoph Steiger, ARC Seibersdorf Research GmbH (Austria)

Published in SPIE Proceedings Vol. 5679:
Machine Vision Applications in Industrial Inspection XIII
Jeffery R. Price; Fabrice Meriaudeau, Editor(s)

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