Gabriele Inglese | Searcharxiv

arXiv2023

Formal derivation of an inversion formula for the approximation of interface defects by means of active thermography

Thermal properties of a two-layered composite conductor are modified in case the interface is damaged. The present paper deals with nondestructive evaluation of perturbations of interface thermal conductance due to the presence of defects. The specimen is heated by means of a lamp system or a laser while its surface temperature is measured with an infrared camera in the typical framework of Active Thermography. Defects affecting the interface are evaluated using an inversion formula obtained by means of Laplace transformation and suitable symmetries of parabolic differential operators (reciprocity). Results of numerical inversion from simulated data are encouraging

math-ph↗

arXiv2019

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.

physics.app-ph↗