Characterization of open cracks in burst vibrothermography experiments

摘要

In this work, we use vibrothermography to characterize open vertical cracks in a fast way. We excite the sample by a brief ultrasound burst and we record the evolution of the surface temperature distribution with an IR camera. From this sequence, temporal and spatial information is selected to characterize the heat sources activated at the defects. This ill-posed inverse problem is solved by inverting the data with a dedicated stabilized inversion algorithm. Experiments performed on samples containing artificial calibrated heat sources confirm the validity of the method to characterize both homogeneous and inhomogeneous flux distributions generated at the defects.