Closed loop resonant rotation rate sensor

Details Closed loop resonant rotation rate sensor Closed loop resonant rotation rate sensor

1997-04-11

1998-12-15

Chapman, John E.

Measuring and testing

Speed, velocity, or acceleration

Angular rate using gyroscopic or coriolis effect

7350412, G01P 904

Patent

active

058500359

ABSTRACT:
A closed loop sensor that utilizes a piezoelectric structure. In one embodiment, drive
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: 4898032 (1990-02-01), Voles
patent: 5056366 (1991-10-01), Fersht et al.
patent: 5400269 (1995-03-01), White et al.

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