Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect
Patent
1986-03-31
1990-09-25
Chapman, John
Measuring and testing
Speed, velocity, or acceleration
Angular rate using gyroscopic or coriolis effect
G01C 1956
Patent
active
049585193
ABSTRACT:
To measure low-level angular vibrations such as 10.sup.-6 radians at frequencies from zero to 10 kHz in a small device two embodiments of vibrators are used: one having two parallel spaced-apart steel plates connected at their bottom end to a platform through a magnetic path and aligned with the direction of an axis of rotation of the plate and the other having a tuning fork. Between the steel plates at their upper end in the first embodiment is mounted a source of magnetic flux which, when energized, pulls the two upper ends of the plates together and releases them at a resonant vibrating frequency which is at least ten times the frequency of the highest angular velocity of the platform about the axis. In the second embodiment, a piezoelectric driver is mounted to the tuning fork at a location creating vibration at the required frequency in the tines of the tuning fork. The dimension of the plates or tunes in the direction of measurement is sufficient to prevent bending from the forces of reaction from Coriolis acceleration. Accelerometers are mounted to the vibrating plates or tunes to measure Coriolis acceleration in a direction transverse to the direction of vibration and to the axis of rotation and the demodulated signal from the accelerometers indicates the low-level angular vibration.
REFERENCES:
patent: 2494109 (1950-01-01), Wolfe
patent: 2544646 (1951-03-01), Barnaby et al.
patent: 2552722 (1951-05-01), King
patent: 3127775 (1964-04-01), Hansen et al.
patent: 3442140 (1969-05-01), Pelteson
patent: 3525884 (1970-08-01), Onoe et al.
patent: 3597642 (1971-08-01), Kurino
patent: 3616699 (1971-11-01), Brand
"Piezoelectric Vibrating Beam Rate Gyro", by Watson from "Navy Technical Disclosure Bulletin," vol. 4, No. 6, Jun. 1979, pp. 41-45.
Carney Vincent L.
Chapman John
The Board of Regents of the University of Nebraska
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