Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1990-01-29
1991-02-19
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367155, 367160, 367174, 367163, H04R 1700
Patent
active
049950142
ABSTRACT:
The housing of a transducer supports both dynamic and static pressure sensors to obtain depth information as well as pressure wave signals. A semiconductive diaphragm with diffused resistances connected in a bridge is used as the static sensor which is centrally located on an end face of the housing. Several parallel-connected dynamic sensor elements are arrayed around the static sensor. Each dynamic sensor element is an edge supported brass disk with a thin piezoelectric ceramic disk soldered to it such that the disks flex in response to low frequency pressure waves to generate corresponding electrical signals. A low noise amplifier and filter is capacitively coupled to the dynamic sensor array to process hydrophone signals at a frequency below 1 Hz.
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patent: 4547869 (1985-10-01), Savit
patent: 4648082 (1987-03-01), Savit
patent: 4749254 (1988-06-01), Seaver
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Eldred J. Woodrow
Jordan Charles T.
Sparton Corporation
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