Broadly tuned directional transducer

Details Broadly tuned directional transducer Broadly tuned directional transducer

H - Electricity

04

R

349/34

H04R 17/10 (2006.01) G10K 11/02 (2006.01)

Patent

CA 1136257

ABSTRACT A tuned acoustic directional transducer for transmitting and receiving airborne sound, which provides enhanced efficiency and reduced cost without undue narrowing of bandwidth, makes use of an acoustic transducer element coupled to a plate having a higher order flexural mode resonance at approxi- mately the desired frequency of operation, the plate being coupled to the air through low-hysteresis acoustic propaga- tion material having an acoustic impedance much less than that of the plate and much greater than that of the air. The material is disposed so that in the desired direction of pro- pagation there is no substantial reduction of sound intensity in the far field resulting from cancellation occasioned by. interaction of sound radiated from adjacent antinodal zones. Preferably the thickness of the material is such that it acts as an efficient acoustic impedance matching transformer. Preferably, the transducer element is piezoelectric and coup- led to the centre of a circular plate to which the coupling material is applied in rings.

367186

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