H - Electricity – 01 – L
Patent
H - Electricity
01
L
349/30, 349/58.1
H01L 41/08 (2006.01) B06B 1/06 (2006.01) G10K 11/28 (2006.01) H04B 11/00 (2006.01)
Patent
CA 1079393
TRANSDUCER ASSEMBLY AND METHOD FOR RADIATING AND DETECTING ENERGY OVER CONTROLLED BEAM WIDTH ABSTRACT OF THE DISCLOSURE A transducer assembly capable of radiating and detecting energy over a controlled beam width around a selected axis is formed by a piezoelectric element mounted in a cylindrical resonant cavity defined by a Helmholtz chamber. The resonant chamber has an energy emitting end wall positioned normal to the selected axis and is arranged to emit energy symmetrically around the axis at the predetermined radial off- set distance therefrom. The energy emitted from the chamber through the end wall sums to form along and around the selected axis a beam-like pattern of controlled width, the beam width being controllable as a function of the offset distance and the energy wavelength. In one embodiment, circular apertures which operate to emit spherical radiation patterns are formed in the chamber end wall. In another embodiment, an annular aperture is formed in the chamber end wall concentric with the selected axis.
268091
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