A recently developed semi-analytical technique called distributed point source method (DPSM) is used for solving various wave scattering problems. Scattering of focused ultrasonic fields by air bubbles or cavities in solid media is investigated here. Results for both single and multiple cavity geometries are presented. It is investigated when two cavities in close proximity can be distinguished and when it is not possible. The interaction effect between two cavities prohibits simple linear superposition of single cavity solutions to obtain the solution for the two cavities placed in close proximity. Therefore, although some analytical and semi-analytical solutions are available for the single cavity in a focused ultrasonic field, those solutions cannot be simply superimposed for solving the two-cavity problem even in a linear elastic material. The comparison between the ultrasonic energies reflected from two small cavities versus a single big cavity is also investigated.
ASJC Scopus subject areas
- Acoustics and Ultrasonics