Experimental verification of the topological sensitivity approach to elastic-wave imaging
Roman Tokmashev (University of Minnesota), Antonin Tixier (Ecole Polytechnique), Bojan Guzina (University of Minnesota)
Characterization and Imaging of Structural and Material Imperfections
Mon 2:40 - 4:00
Barus-Holley 191
In this study, the method of topological sensitivity (TS) for wave-based defect reconstruction, previously supported by an extensive set of numerical simulations, is put to test experimentally in the context of 2D defect reconstruction in a thin aluminum plate using ultrasonic waves. The measurements of transient wave fields along the edges of the plate were performed in a non-contact fashion by a 3D Laser Doppler Vibrometer. Using the elastodynamic finite element method as a computational platform, the TS reconstruction maps were obtained and analyzed under varying experimental conditions. The results show a remarkable agreement between the defect geometries and their reconstructions, demonstrating the utility of the topological sensitivity approach as an ecient and robust imaging tool.