Identification of the Thermal Conductance of a hidden barrier from outer thermal data

Hidden defects affecting the interface in a composite slab are evaluated from thermal data collected on the upper side of the specimen. First we restrict the problem to the upper component of the object. Then we investigate heat transfer through the inaccessible interface by means of Thin Plate Approximation. Finally, Fast Fourier Transform is used to filter data. In this way we obtain a reliable reconstruction of simulated flaws in thermal contact conductance corresponding to appreciable defects of the interface.