USA As Represented by Secretary of the Navy

Edward F Rynne, Jr

Russell E Hammond

Leopold J Johnson

Jay C Brown

The invention integrates an amplifier directly into an electromechanical transducer assembly. In one embodiment of this invention, power from a power supply is supplied to what can be described as an electromechanical amplifier that includes bridge circuits that directly drive the transducer elements. Each transducer element can include its own co-located switching network, such as, for example, a bridge circuit, that can be used with other system components to control when and for how long a voltage of equal magnitude and of either a positive or negative polarity is selectively directed to the element to expand or contract it in relation to a signal desired to be acoustically transmitted. Besides permitting an output of two voltages of equal magnitude and opposite polarity, the bridge circuit also permits an output that is &ldquo;open&rdquo; and one that allows a dissipation of transducer element charge.

Digital drive sonar power amplifier

A voltage controlled variable inductor provides a rapidly variable inducte for high power frequency dependent circuit applications. Continuously variable inductance values having a high Q factor are obtainable with the application of only a minimal amount of control power.

Voltage controlled variable inductor

A sensor, having a sandwich configuration, is able to sense a transduce out parameter in situ without significantly affecting the parameter. The sensor comprises an inner sheet of a polymer having a transducer property. A conductive layer is deposited on parts of at least one of the two surfaces of the inner sheet. A pair of outer sheets of plastic are attached to each side of the inner sheet. Two layers of conductive material may be deposited on the outer, unattached, surfaces of the outer sheets, one layer on each surface.

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San Diego, CA, United States of America

Edward F Rynne, Jr