Sonic IR NDE is a relatively new hybrid NDE technology which has been proven to be
reliable and sensitive to detect flaws of different types in a variety of materials and structures.
Despite the success this technology has achieved in detecting defects, little work has been
devoted to characterizing defects quantitatively. In this study, we present a model that
describes heat diffusion from subsurface defects in a composite material using Green's
function procedure. The model is used to map some aspects of the temperature-time curve …