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The aim of this work is to conceive a thermal NDE method in order to detect source terms placed under thin diffusive plates, with an extension to thermal bridges in insulating stratified media. Contrarily to the detection of delaminating in composite samples, such situation induces strong 2D transient effects which force us to consider the spatial correlation between the pixels. In order to avoid a heavy inversion process, a suitable approximation of the exact analytical model of heat diffusion is developed, in order to estimate the lateral size of the source term. The interesting feature of this method is that robust estimations are processed with no prior knowledge of the measurement noise variance. Experimental results illustrate the method.

Detection of thermal bridges in insulating stratified media with thermography-a 2D transient direct model suitable to implement a Total Least Squares estimation method