Square pulse thermography system design considerations for detection of voids inside of the material with different properties and finite differences

Gerhard Traxler; Michael Scheerer; Christoph Steiger

doi:10.1117/12.585744

24 February 2005 Square pulse thermography system design considerations for detection of voids inside of the material with different properties and finite differences

Gerhard Traxler, Michael Scheerer, Christoph Steiger

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Proceedings Volume 5679, Machine Vision Applications in Industrial Inspection XIII; (2005) https://doi.org/10.1117/12.585744
Event: Electronic Imaging 2005, 2005, San Jose, California, United States

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.

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Gerhard Traxler, Michael Scheerer, and Christoph Steiger "Square pulse thermography system design considerations for detection of voids inside of the material with different properties and finite differences", Proc. SPIE 5679, Machine Vision Applications in Industrial Inspection XIII, (24 February 2005); https://doi.org/10.1117/12.585744

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KEYWORDS

Fused deposition modeling

Finite element methods

Thermography

Cameras

Inspection

Temperature metrology

Heat flux

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