Flextensional transducers

Details Flextensional transducers Flextensional transducers

H - Electricity

04

R

356/200, 349/57.

H04R 1/44 (2006.01) G10K 9/12 (2006.01)

Patent

CA 1333419

A high power, low frequency flextensional transducer for underwater use comprises a number of spaced piezo-electric element stacks between opposed inserts. A Kevlar (registered trademark) compression band is wound around the stacks and inserts and then partly elliptical plaster formers are attached. A filament-wound elliptical GRP flexural shell is then wound around the assembly while controlling the tension so as to provide the required pre-stress on the piezo-electric stacks when cured. After curing the plaster formers are removed. End-plates are attached to the elliptical shell to complete the transducer; the shell having a compression bonded layer of neoprene applied, including a peripheral serrated lip seal to seal against the end- plate while permitting flexing of the shell. A means to provide wide bandwidth performance is also disclosed. To extend the range of operational depths the cavity within the transducer is filled with a gas whose vapour pressure can be temperature-controlled.

556752

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