LAMB WAVE SCATTERING ANALYSIS FOR REFLECTOR CHARACTERIZATION

The potential use of guided waves for defect characterization is studi ed. The influence of defect shape and size on transmitted and reflecte d fields is considered. Using the hybrid boundary element technique, t he reflection and transmission coefficients for selected guided wave m odes are numerically calculated and compared to experimental data. Sel ecting the aspect ratio as a shape parameter for various defects, the transmission and reflection coefficients are measured for certain guid ed wave modes input to the defect. The influence of defect size is the n studied by monitoring the transmission and reflection coefficients f or defects of various shapes and depths. The studies presented indicat e that defect characterization is possible if a proper mode selection criteria can be established. The suitable features related to transmis sion and reflection coefficient data can also be used for algorithm de velopment and implementation purposes of defect characterization.