Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect
Patent
1990-10-02
1995-02-07
Chapman, John E.
Measuring and testing
Speed, velocity, or acceleration
Angular rate using gyroscopic or coriolis effect
310329, G01P 904
Patent
active
053867262
ABSTRACT:
A vibratory gyroscope comprises, with respect to an XYZ coordinate system, a tuning fork having two arm members extending from a base member in the direction of the Z-axis, a support member extending from the base member in the direction of the Z-axis, and a pickup member which senses a Coriolis force acting on the two arm members when they are caused to vibrate. The pickup member includes a layer of piezoelectric material polarized in the direction of the Z-axis and at least one pair of electrodes disposed on surfaces of the support member which are in parallel to the Z-axis. At least one of the electrodes is positioned to one side of a center line on its respective surface, the center line being parallel to the Z-axis. In one embodiment, the pickup member itself constitutes the support member of the tuning fork. In another embodiment, the pickup member is a separate unit which is affixed to a surface of the support member of the tuning fork.
REFERENCES:
patent: 2513340 (1950-07-01), Lyman
patent: 3219850 (1965-11-01), Langevin
patent: 3241377 (1966-03-01), Newton
patent: 3839915 (1974-10-01), Schlitt
patent: 4538461 (1985-09-01), Juptner et al.
patent: 4703655 (1987-11-01), Konuo et al.
patent: 4836023 (1989-06-01), Oikawa
"Fundamentals of the Vibratory Rate Gyro", J. B. Chatterton, ASME Jan. 1956, pp. 123-125.
"Piezoelectric Vibratory Gyroscopes", M. Konno, pp. 53-60.
"Mechanical Channel Filter Using a Torque Transducer of Temperature Compensation Type", T. Hayashi, Mar. 1980, p. 64.
Akai Electric Co. Ltd.
Chapman John E.
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