A new thermographic methodology for measuring the thermal diffusivity of a platelike sample is presented. In particular, the study of the time evolution of the spatial distribution of the surface temperature of the rear face of the plate (after heating its front surface by a flash Gaussian shaped source) enables to determine the in-plane thermal diffusivity. This technique is applied to an AISI304 stainless steel plate and the results are compared with literature value and with the value obtained on the same material by using Thermal Wave Interferometry.
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