Abstract

Sound waves propagating as transverse modes in hollow tubes possess polarization properties similar to electromagnetic waves. A demonstration of these properties will be given which will include the rotation of the plane of polarization by “half-wave plates,” the production of circularly polarized sound waves by “quarter-wave plates,” cut-off effects (as in electromagnetic waveguides), and the radiation pattern of radiators fed by polarized waves. The use of transverse modes in high-Q resonators, filters, concave converging lenses and gyrators will be discussed, also the use of the dispersive properties of transverse wave guides for separating in time pulses of different frequency

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