Title :
Finite difference modelling of pulse-echo scattering [flaw detection]
Author_Institution :
Dept. of Phys., City Univ., London, UK
Abstract :
Pulse-echo scattering in an elastic solid has been investigated using finite difference methods. The aim was to investigate the forward scattering problem using realistic transducer signals and realistic defects. New finite difference algorithms have been developed, most notably for the free and internal boundaries. A better method of programming the input pulse has been discovered. Excellent agreement of calculated echo signals with real data has been obtained. The evolution of the outgoing and scattered waves can be shown pictorially, illuminating what is happening. The methods should be valuable in model testing, as well as in improving target characterization from real data
Keywords :
finite element analysis; flaw detection; ultrasonic scattering; algorithms; calculated echo signals; elastic solid; finite difference modelling; forward scattering problem; free boundaries; input pulse programming method; internal boundaries; outgoing waves; pulse-echo scattering; realistic defects; realistic transducer signals; scattered waves; target characterization; Difference equations; Diffraction; Finite difference methods; Inverse problems; Physics; Scattering; Solids; Surface waves; Testing; Transducers;
Conference_Titel :
Ultrasonics Symposium, 1991. Proceedings., IEEE 1991
Conference_Location :
Orlando, FL
DOI :
10.1109/ULTSYM.1991.234050
