Theoretical and Experimental Analysis of the Thermal Response in Induction Thermography in the Frequency Range of 2.5 Hz to 20 kHz

The one-dimensional propagation of electromagnetic waves and the resulting thermal in conducting material are analysed a coherent way. heat release due to resistive losses has static an oscillating part. Both considered as source terms for diffusion equation. time dependence temperature is described by analytical solutions. Electrically thermally materials classified ratio penetration depth skin depth. Experiments performed on ferritic steel, stainless steel carbon-fibre-reinforced polymer show signal after heating begins, theory. At low induction frequencies, part surface at double frequency detected accordance with results point out new opportunities thermography.