This is an example designed to illustrate how easy it is to define and use annular sources and receivers in a Wave2500 simulation.

Here, a Gaussian modulated 1 MHz sine wave is generated by a 5 mm wide "ring" source transducer located on the top of a cylinder of water. The following figure displays a "movie" of the ultrasound wave as it propagates through the water. Note that a number of separate rings could be defined and each given a prescribed delay for focussing. Not shown are the measurements of an annular ring transducer located within the cylinder. Receiver "rings" could also be phased for focussing.

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