Accession Number : ADD015580

Title :   Pressure Compensated Transducer System with Constrained Diaphragm.

Descriptive Note : Patent, Filed 29 Jul 88, patented 18 Aug 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Percy, Joseph L

Report Date : 18 Aug 1992

Pagination or Media Count : 7

Abstract : An acoustic source apparatus has a acoustic transducer that is enclosed in a substantially rigid and watertight enclosure to resist the pressure of water on the transducer and to seal the transducer from the water. The enclosure has an opening through which acoustic signals pass and over which is placed a resilient, expandable and substantially water-impermeable diaphragm. A net stiffens and strengthens the diaphragm as-well-as constrains the diaphragm from overexpansion or from migrating due to buoyancy forces. Pressurized gas, regulated at slightly above ambient pressure, is supplied to the enclosure and the diaphragm to compensate for underwater ambient pressures. Gas pressure regulated at above ambient pressure is used to selectively tune the pressure levels within the enclosure and diaphragm so that diaphragm resonance can be achieved. Controls are used to selectively fill, as-well-as vent the enclosure and diaphragm during system descent and ascent, respectively. A signal link is used to activate these controls and to provide the driving force for the acoustic transducer.

Descriptors :   *ACOUSTIC SIGNALS, *DIAPHRAGMS(MECHANICS), *ELECTROACOUSTIC TRANSDUCERS, *PATENTS, ACOUSTICS, BUOYANCY, OPENINGS, PRESSURE, RESONANCE, SIGNALS, TRANSDUCERS, VENTS, WATERTIGHT FITTINGS, UNDERWATER ACOUSTICS, PRESSURE TRANSDUCERS

Subject Categories : Acoustic Detection and Detectors
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE