Vibration gyroscope

Details Vibration gyroscope Vibration gyroscope

1997-04-24

1999-05-11

Chapman, John E.

Measuring and testing

Speed, velocity, or acceleration

Angular rate using gyroscopic or coriolis effect

G01P9/04

Patent

active

059029315

ABSTRACT:
A vibration gyroscope which is capable of accurately detecting a rotational angular velocity regardless of environmental changes or changes in vibrator characteristics includes a vibrator formed of a vibration element, and first and second piezoelectric elements for detection and a third piezoelectric element for driving. Output currents of the first and second piezoelectric elements are converted into voltages by I-V conversion circuits, or output voltages of the first and second piezoelectric elements are detected by voltage detection circuits, and then the voltages are added together by an adder circuit. An output signal of the adder circuit is monitored by a monitor circuit. On the basis of this result, the voltage or the phase of a drive signal fed from an oscillation circuit to the third piezoelectric element is controlled. The output signals of the I-V conversion circuits or the output signals of the voltage detection circuits are formed into a DC signal corresponding to a rotational angular velocity via a differential amplifier circuit, a synchronization detection circuit, a smoothing circuit, and an amplifier circuit.

REFERENCES:
patent: 5349857 (1994-09-01), Kasanami et al.
patent: 5434467 (1995-07-01), Abe et al.
patent: 5635787 (1997-06-01), Mori et al.

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