Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1990-06-05
1991-09-03
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367171, 73516LM, 310329, H04R 1700, G01P 1509
Patent
active
050460560
ABSTRACT:
A self-orienting vertically sensitive accelerometer is disclosed for measuring a vertical component of acceleration independently of the orientation of the accelerometer. The accelerometer of the present invention includes a spherical plastic shell having a plurality of perforations disposed therein and a thin film of metallic coated piezoelectric polymer bonded to the exterior thereof, forming a small diaphragm at each perforation. In response to acceleration a dynamic pressure is developed within a fluid mass partially filling the spherical plastic shell which creates a strain and resultant charge in each small diaphragm of piezoelectric polymer. The vast difference in density between the fluid mass and the air in the remaining volume of the spherical plastic shell permits the charge developed in each small diaphragm under fluid pressure to be attributed solely to the vertical component of acceleration applied to the fluid mass. In a preferred embodiment of the present invention the self-orienting vertically sensitive accelerometer is mounted within a low density open cell foam and utilized within a marine seismic streamer wherein orientation of each accelerometer is not easily controlled.
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Clemens Jack G.
Sallas John J.
Alexander David J.
Halliburton Geophysical Services Inc.
Lobo Ian J.
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