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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.

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