NDE: Infrared Flash Thermography (IFRT)

    A brief pulse of light energy from a flash lamp array heats the inspection surface of a composite specimen, and an IR camera monitors the surface temperature (or radiance) as the sample cools. Internal thermal discontinuities (for example, voids, delaminations or a wall or interface between the host material and a void or inclusion) modify the local cooling of the surface, and the corresponding radiation flux from the surface is detected by the IR camera.