Acoustic transducer

Details Acoustic transducer Acoustic transducer

H - Electricity

04

R

H04R 1/34 (2006.01) G10K 9/122 (2006.01) G10K 13/00 (2006.01)

Patent

CA 2105491

A flexural mode acoustic transducer system for use in pulse-echo ranging systems has a radiating plate of which even-numbered antinodal zones, counting from a drive connection to a driving element at the centre of the plate, are formed with rings of apertures to reduce the radiating areas of those zones, thus reducing cancellation in the far field, and improving the matching of the device to the atmosphere into which the plate is radiating. The plate is backed by a sound deadening layer on a flange of a transducer housing, from which it is separated by a foil which is non-adherent to the plate, and is preferably covered by an acoustically transparent fabric having a pore size small enough to exclude damaging particulates.

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