Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1988-08-04
1989-10-17
Steinberger, Brian S.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367172, H04R 1500
Patent
active
048751995
ABSTRACT:
This invention relates to an underwater transient sound generator capable of operating at substantial depths. The pulse produced by the generator is used to determine subbottom terrain in underwater surveying. Essentially, the invention consists of an electromagnetic coil, which is embedded in an annular support body with a central hole. A piston is located next to the coil, but is separated therefrom by a dielectric sheet. A rubber seal and spring are used to locate the piston in position. A body portion extends back from the support body with two open ends. The rear end is covered with a water tight flexible diaphragm and the front end connects with the central hole of the support body, defining a watertight pressure transfer space, containing a pressure transfer medium. The coil is capable of being energized to rapidly displace the piston to a forward position. Two embodiments are shown in which the pressure transfer medium is either a gas or a fluid. In the gas filled embodiment a check valve is placed in the space dividing it into two portions. On the outward stroke of the piston, the gas can flow into the piston space. On the return stroke of the piston gas flow is blocked by the check valve. A bleed tube is provided around the check valve to permit gradual pressure equalization to occur as the piston is returned to its original position. In the second embodiment, the fluid is a non-cavitating low viscosity liquid, which acts in combination with the spring to initially dampen the return stroke of the piston.
REFERENCES:
patent: 2897475 (1959-07-01), Harris
patent: 2903673 (1959-09-01), Harris
patent: 2906993 (1959-09-01), Steinberger
patent: 2978669 (1961-04-01), Harris
patent: 3118125 (1964-01-01), Sims
patent: 3150345 (1964-09-01), Freeman
patent: 3336573 (1967-08-01), Gallaway
patent: 3560913 (1971-02-01), Copley
patent: 3764966 (1973-10-01), Abbagnaro
patent: 3993973 (1979-11-01), Hutchins
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