Communications – electrical: acoustic wave systems and devices – Transmitter systems – Animal control
Patent
1994-11-14
1996-07-02
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Transmitter systems
Animal control
367175, 181140, H04B 102
Patent
active
055329802
ABSTRACT:
An anti-fouling system for producing vibrations in an underwater structure to inhibit the attachment of aquatic life forms to the structure. The system includes a controller which drives one or more transducer. The transducer comprises a housing, one end of which is closed by a resilient diaphragm. An electromagnet with soft magnetic core is contained in the housing spaced from an unsupported portion of the diaphragm. The unsupported portion of the diaphragm is mounted over an underwater structure. In operation, the electromagnet is excited with a current pulse, which deforms the diaphragm so that the housing moves towards the structure. As the current drops off, the diaphragm is restored to its original shape and the housing moves away from the structure imparting a vibrational force to the structure. The transducer includes an elastic membrane to compensate for changes in temperature and pressure commonly found when working under water. The magnetic cores positioned in the transducers are saturated by current pulses generated by the controller to eliminate the effects of component variations and allow multiple units to be connected to the controller without changes in sound levels. The system is highly resistant to electrolytic corrosion, since, most of the time, there is no voltage difference between the resonators, wires, and ground.
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Abandoned U.S. patent application Ser. No. 07/795,494 filed Nov. 21, 1991 entitled "Transducer for Vibrating Near Surface Underwater Structures" comprising of 15 pages of specification; 2 pages of drawings.
Verge Clarence
Zarate Carlos E.
Zarate H. Graciela
Eldred J. Woodrow
Sciencetech Inc.
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