Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect
Patent
1997-04-30
1998-08-18
Chapman, John E.
Measuring and testing
Speed, velocity, or acceleration
Angular rate using gyroscopic or coriolis effect
7350412, G01P 904
Patent
active
057960020
ABSTRACT:
A closed loop sensor that utilizes a piezoelectric structure. In one embodiment, driven
on-control electrodes apply drive voltages to the piezoelectric structure and drive/control electrodes apply drive/control voltages to the piezoelectric structure to cause drive mode displacement of the piezoelectric structure and cancel motion induced pickup mode and quadrature displacements of the piezoelectric structure. In another embodiment, pickup/control electrodes detect a pickup signal from the piezoelectric structure corresponding to the motion induced pickup mode and quadrature displacements and apply a control signal to the piezoelectric structure so as to cancel these displacements. In still another embodiment of the invention, an optical sensing device optically senses the motion induced pickup mode and quadrature displacements and control electrodes apply a control signal to the piezoelectric structure so as to cancel them.
REFERENCES:
patent: 4654663 (1987-03-01), Alsenz et al.
patent: 4819486 (1989-04-01), Kunkel et al.
patent: 4898032 (1990-02-01), Voles
patent: 5056366 (1991-10-01), Fersht et al.
patent: 5198663 (1993-03-01), Ichikawa et al.
BEI-Systron Donner
Chapman John E.
Knauer, Esq. Stephen M.
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