Improving the resolution of pulsed thermal wave images with a simple inverse scattering technique

We have developed an inverse scattering technique for removing the blurring of pulse-echo thermal wave images. Preliminary results have been presented elsewhere [1-5]. We have extended the method to include thermally anisotropic materials and also multiple scattering effects. The method provides an algorithm for inverting a single image, and obtains the shape of the scatterer with a single calculation. The method involves no tomographic reconstruction and does not rely on a successive approximation scheme

THERMAL WAVE IMAGING OF CRACKS IN METALS

Une étude comparative d'ondes thermiques (SPAM et OBD) a été effectuée sur des failles, obliques et closes, faites dans des métaux. Il y a une bonne corrélation entre les résultats expérimentaux et les calculs théoriques.A comparitive thermal wave study (SPAM and OBD) has been done on cracks, slanted and closed, in metals. There is a good correlation between the experimental results and the theoretical calculations

Thermal wave imaging of propagating cracks in polymers

Thermal wave imaging techniques, using both an Inframetrics IR740 Camera and a Santa Barbara Focal Plane InSb array camera, have been used to measure the temperature distributions around propagating cracks in polymer materials. Cracks have been initiated under tensile stress with various strain rates, and in several different polymer materials. The time-dependent thermal behavior is then studied. This behavior includes elastic cooling, followed by heating caused by plastic deformation in the stressed region prior to crack formation, and localized heating as the crack initiates and propagates, followed by diffusive cooling after failure. The fullfield picture provides also information about the interaction of cracks with pre-existing flaws, and the dynamics of the interaction between two cracks

Animal rationality and implications for resource management: the case of biological reserves for moose and pine

Forest management, Animal behavior, Animal rationality, Q29,