Accession Number : ADD015431

Title :   Constrained Diaphragm Transducer.

Descriptive Note : Patent, Filed 29 Jul 88, patented 14 Apr 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Percy, Joseph L

Report Date : 14 Apr 1992

Pagination or Media Count : 4

Abstract : An acoustic source apparatus has a loudspeaker enclosed within a substantially pressure resistant and water tight enclosure. Acoustic energy from the loudspeaker emanates through an opening in the enclosure. This opening is covered by a resilient diaphragm that transmits the acoustic energy to an aqueous medium. A net constrains the diaphragm to a preselected size and shape. The net further impedes overexpansion of the diaphragm and restrains the diaphragm from migrating due to buoyancy. Additionally, the net stiffens and strengthens the diaphragm, to thereby increase the resonant frequency, impedance and quality factor of the transducer system and decrease the transmission bandwidth of the system. Constraining the transducer diaphragm with the net makes higher transducer source levels possible.

Descriptors :   *TRANSDUCERS, *DIAPHRAGMS(MECHANICS), *PATENTS, ACOUSTICS, BANDWIDTH, BUOYANCY, ENERGY, FREQUENCY, IMPEDANCE, LOUDSPEAKERS, NETS, OPENINGS, PRESSURE, QUALITY, RESONANT FREQUENCY, SHAPE, WATER

Subject Categories : Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE