Mr. Paul Lasserre Profile

Paul Lasserre

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Proceedings Article | 12 June 2023 Presentation + Paper

Estimation of the area and depth of buried heat sources: an approach to characterize defects in inductive and ultrasound excited thermography

Arantza Mendioroz, Agustín Salazar, Paul Lasserre, Beate Oswald-Tranta, Christoph Tuschl

Proceedings Volume 12536, 125360M (2023) https://doi.org/10.1117/12.2663135

KEYWORDS: Thermography, Temperature distribution, Thermal modeling, Diffusion, Solids, Material characterization

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We address the characterization of defects that behave as heat sources in nondestructive thermographic techniques. First, we consider tilted heat sources of rectangular shape. We calculate the evolution of the surface temperature distribution generated in a short excitation. For the characterization, we make use of the thermogram obtained at the end of the excitation and the temperature evolution at the center of the early heated region. A sensitivity analysis indicates that the optimum excitation duration corresponds to a thermal diffusion length similar to the depth of the deepest end of the heat source. By fitting synthetic data with added noise, we analyze the influence of the signal to noise ratio and the inclination of the heat source on the fitted parameters. Inductive thermography experiments carried out on insulating samples with embedded Cu slabs confirm the ability of the method to characterize tilted heat sources and indicate that the penetration is the most elusive parameter. In the second part, we present a methodology to deal with horizontal heat sources of unknown geometry. We average the thermogram obtained at the end of the excitation in circumferences concentric with the center of the heated region. This averaged radial profile, together with the temperature evolution at the center of the heated region is fitted to a circular heat source model. Fittings of experimental data taken on samples with horizontal rectangular Cu slabs allow determining the area with accuracy better than 20% and the depth with 10%.

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