The design of an acoustic lens that reduces spreading and controls the power from an ultrasonic transducer is given. A ray theory for acoustics, analogous to that in optics, is reviewed. This allows geometrical analysis to be used to design a lens to control diffraction spreading from a piston source. A ray model for the piston source is given. Layers of different materials are used to reduce the reflection at the interfaces. A numerical simulation is carried out to show that the complete lens system, under the approximations made, concentrates the radiation in a specified focal region.
|Original language||English (US)|
|Journal||T.&A.M. Report (University of Illinois at Urbana - Champaign, Department of Theoretical and Applied Mechanics)|
|State||Published - Dec 1 1983|