One-dimensional photothermal characterization of subsurface interfaces utilizing the virtual wave concept

L. Gahleitner, G. Thummerer, G. Mayr, G. Mayr, P. Burgholzer, U. Cakmak

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This work presents one-dimensional photothermal results for estimating subsurface interface parameters using the virtual wave concept. The performed study demonstrates the capability of the virtual wave concept as a feature extraction method for estimating the depth position and thermal mismatch of subsurface interfaces within layered materials. The mathematical relationship between the reflection coefficient of the thermal wave and the signal of the virtual wave is demonstrated for exact one-dimensional solutions. For experimental validation, pulsed thermography in the pulse-echo configuration for different metallic specimens is applied. This method yields a very good estimation of the interfacial parameters for the analyzed samples. In summary, a feasible and fast one-dimensional photothermal evaluation of subsurface interfaces using the virtual wave concept is demonstrated.

Original languageEnglish
Article number102994
Pages (from-to)102994
JournalNDT & E INTERNATIONAL
Volume141
Early online date1 Nov 2023
DOIs
Publication statusPublished - Jan 2024

Keywords

  • Inverse 1D heat conduction problem
  • Layered materials
  • Photothermal reconstruction
  • Thermal wave reflection coefficient
  • Virtual wave concept

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