Low frequency hydrophone and depth sensor assembly
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United States of America Patent
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-
Feb 19, 1991
Grant Date -
N/A
app pub date -
Jan 29, 1990
filing date -
Jan 29, 1990
priority date (Note) -
Expired
status (Latency Note)
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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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