Self-orienting vertically sensitive accelerometer

Details Self-orienting vertically sensitive accelerometer Self-orienting vertically sensitive accelerometer

1991-01-28

1992-06-30

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

367166, 367171, 367180, 310800, H04R 1700, G01P 1509

Patent

active

051269805

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.

REFERENCES:
patent: 4345473 (1982-08-01), Berni
patent: 4354134 (1982-10-01), Micheron
patent: 4624140 (1986-11-01), Ekchian et al.
patent: 4805157 (1989-02-01), Ricketts
"Ferroelectric Ceramics vs Polymer Piezoelectric Materials," Lancee et al., Ultrasonics, May 1985.

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