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Abstract
This paper describes the induction-lockin-thermography (ILT) in non-destructive testing (NDT). The defect can be localised and its depth estimated by the phase and the module of the temperature in synchronic regime. Various sources of external energy can be used to excite the heat flux in examined object. In this work the electromagnetic induction is employed to heat the specimen. The interaction of the specimen with the induction stimulation is studied by using the axisymmetric magnetothermal model, which is solved by the finite element method (FEM). This study aims to detect the eventual defect by choosing both parameters, electromagnetic and thermal frequencies.
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