Impuls-Video-Thermografie - ein leistungsfähiges Verfahren zur zerstörungsfreien Prüfung neuer Werkstoffe

Pulsed video thermography is a nondestructive testing technique which is suited for application in industrial practice, especially for nondestructive testing of new materials. The advantages of the method are due to the high testing speed and due to the fact that it is a contactless an testing-method. Pulsed video thermography is a near-surface testing technique for the detection and characterization of subsurface defects whose lateral extension is not smaller than their distance to the surface. The technique is espially used for nondestructive testing of new materials like fiber reinforced plastics, ceramic materials and ceramic coated compound structures. Due to the time-dependence of the heat-diffusion process it is possible to reconstruct defects in the near-surface region by analyzing image sequences of the thermographic testing system from the cooling process at specimen surface after pulse heating. In this paper a first approximation for the solution of this reconstuction proble m is presented.