Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Patent
1993-03-29
1995-05-16
Chilcot, Jr., Richard E.
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
73510, 310321, G01P 1509
Patent
active
054150396
ABSTRACT:
An acceleration sensor includes a vibrator of, for example, a quadrangular prism shape. On the opposed side faces of the vibrator, piezoelectric elements are formed. The piezoelectric elements are polarized from the outside toward the vibrator side. Driving signals of the same phase are applied to these piezoelectric elements. The vibrator vibrates in its longitudinal direction by these driving signals. In the vibrator, a resonance frequency of the longitudinal vibration is equalized to a resonance frequency of the bending vibration. A voltage difference between the output voltages of the two piezoelectric elements is detected by a differential circuit. The shape of the vibrator may be a triangular prism shape. In this case, the piezoelectric elements are formed on the three side faces of the vibrator. Two by two combinations of these piezoelectric elements are input to the differential circuits. The piezoelectric elements may be polarized from the vibrator side toward the outside.
REFERENCES:
patent: 4739211 (1988-04-01), Strachan
patent: 5220833 (1993-06-01), Nakamura
Chilcot Jr. Richard E.
Felber Joseph L.
Murata Manufacturing Co. Ltd.
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