Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect
Patent
1996-04-30
1996-12-17
Chapman, John E.
Measuring and testing
Speed, velocity, or acceleration
Angular rate using gyroscopic or coriolis effect
G01P 904
Patent
active
055855628
ABSTRACT:
A vibration-sensing gyro composed of a light alloy such as duralumin includes a base and a first pair of tines projecting parallel to each other from the base. Piezoelectric elements are mounted on the root of the side faces of the first pair of tines to excite the first pair of tines along an X axis. The vibrations of the first pair of tines along the X axis are then propagated to a second pair of tines to vibrate the second pair of tines along the X axis. Piezoelectric elements are mounted on the root of the upper and the lower faces of the second pair of tines to detect vibrations of the second pair of tines along an Y axis. When the second pair of tines receives the Coriolis force based on an angular velocity .omega. around a Z axis and vibrates along the Y axis, the vibrations along the Y axis are detected as electric signals (alternating current voltages) by piezoelectric effects of the piezoelectric elements.
REFERENCES:
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patent: 5166571 (1992-11-01), Konno et al.
patent: 5329816 (1994-07-01), Soderkvist et al.
J. Soderkvist, "Piezoelectric Beams and Vibrating Angular Rate Sensors" 8104 IEEE Transactions on Ultrasonics, Ferroelectric, and Frequency Control, 38, May 91, No. 3, New York, US, pp. 271-280.
Harada Kenji
Kurata Nobuo
Morikawa Takeshi
Nonomura Yutaka
Okuwa Masayuki
Chapman John E.
Toyota Jidosha & Kabushiki Kaisha
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