Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect
Patent
1994-11-30
1997-02-04
Williams, Hezron E.
Measuring and testing
Speed, velocity, or acceleration
Angular rate using gyroscopic or coriolis effect
7350412, G01C 1900
Patent
active
056000634
ABSTRACT:
A vibration gyro which comprises an oscillator; a plurality of piezoelectric units for oscillating the oscillator in a predetermined driving-axis direction; piezoelectric unit driving means for driving the plurality of piezoelectric units by supplying an electric power to a common electrode of the plurality of piezoelectric units; a plurality of current-voltage converting means each for converting a current outputted from each of noncommon electrodes of the plurality of piezoelectric units to a voltage; eliminating means for eliminating damping components of the plurality of piezoelectric units by amplifying an output of the piezoelectric unit driving means by a predetermined amplification factor, shifting a phase of an amplified signal by a predetermined angle, shunting the amplified signal, and supplying each of shunted signals to each of the plurality of current-voltage converting means; adding means for adding outputs of the plurality of current-voltage converting means and for feeding back an added value respectively to the plurality of the current-voltage converting means; and error calculating means for calculating a difference between the outputs of the plurality of current-voltage converting means.
REFERENCES:
patent: 4671112 (1987-06-01), Kimura et al.
patent: 4791815 (1988-12-01), Yamaguchi et al.
patent: 5117148 (1992-05-01), Nakamura et al.
patent: 5131273 (1992-07-01), Tabata et al.
patent: 5220833 (1993-06-01), Nakamura
patent: 5375336 (1994-12-01), Nakamura
patent: 5412204 (1995-05-01), Nakamura
patent: 5444639 (1995-08-01), White
Mitsubishi Denki & Kabushiki Kaisha
Moller Richard A.
Williams Hezron E.
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