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Applicability of a 1D Analytical Model for Pulse Thermography of Laterally Heterogeneous Semitransparent Materials

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Abstract

Pulse thermography (PT) has proven to be a valuable non-destructive testing method to identify and quantify defects in fiber-reinforced polymers. To perform a quantitative defect characterization, the heat diffusion within the material as well as the material parameters must be known. The heterogeneous material structure of glass fiber-reinforced polymers (GFRP) as well as the semitransparency of the material for optical excitation sources of PT is still challenging. For homogeneous semitransparent materials, 1D analytical models describing the temperature distribution are available. Here, we present an analytical approach to model PT for laterally inhomogeneous semitransparent materials. We show the validity of the model by considering different configurations of the optical heating source, the IR camera, and the differently coated GFRP sample. The model considers the lateral inhomogeneity of the semitransparency by an additional absorption coefficient. It includes additional effects such as thermal losses at the samples surfaces, multilayer systems with thermal contact resistance, and a finite duration of the heating pulse. By using a sufficient complexity of the analytical model, similar values of the material parameters were found for all six investigated configurations by numerical fitting.

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Authors and Affiliations

  1. Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205, Berlin, Germany

    R. Bernegger, S. J. Altenburg, M. Röllig & C. Maierhofer

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  1. R. Bernegger
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  2. S. J. Altenburg
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  3. M. Röllig
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  4. C. Maierhofer
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Corresponding author

Correspondence to R. Bernegger.

Additional information

This article is part of the selected papers presented at the 19th International Conference on Photoacoustic and Photothermal Phenomena.

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Bernegger, R., Altenburg, S.J., Röllig, M. et al. Applicability of a 1D Analytical Model for Pulse Thermography of Laterally Heterogeneous Semitransparent Materials. Int J Thermophys 39, 39 (2018). https://doi.org/10.1007/s10765-018-2362-7

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  • DOI: https://doi.org/10.1007/s10765-018-2362-7

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