Active IR thermography evaluation of coating thickness by determining apparent thermal effusivity

Alexey Moskovchenko, Vladimir Vavilov, Michal Švantner, Lukáš Muzika, Šárka Houdková

Research output: Contribution to journalArticle

Abstract

Pulsed thermography is a common technique for nondestructive testing (NDT) of materials. This study presents the apparent effusivity method for the quantitative evaluation of coating thickness in a one-sided thermal NDT procedure. The proposed algorithm is based on determining a threshold value of apparent effusivity, which can be found for particular coating-on-substrate structures. It has been found that the square root of the time at which the apparent effusivity curve reaches this threshold is proportional to the coating thickness. The efficiency of the proposed approach is demonstrated by analytical modeling and experimentation performed on thermally-sprayed coatings.

Original languageEnglish
Article number4057
JournalMaterials
Volume13
Issue number18
DOIs
Publication statusPublished - Sep 2020

Keywords

  • Apparent effusivity
  • Coating thickness
  • Infrared non-destructive testing
  • Pulse thermography
  • Thermal NDT
  • Thermally sprayed coatings
  • Thermographic testing

ASJC Scopus subject areas

  • Materials Science(all)

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