Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect
Patent
1988-01-22
1989-05-30
Chapman, John
Measuring and testing
Speed, velocity, or acceleration
Angular rate using gyroscopic or coriolis effect
310329, 310370, G01P 904
Patent
active
RE0329312
ABSTRACT:
[A vibratory angular rate sensor system preferably consists of a Z-cut quartz plate forming a mounting frame with a rectangular opening. Within the opening are mounted two pairs of tines. Each pair of tines is parallel to each other, one pair forming the drive tines and the other pair the output tines. Each corresponding set of two tines is disposed along the same axis having a common stem or base. The tines are secured by four bridges integral with the frame and connected to the stem. The arrangement is such that the pair of input tines vibrates in opposition to each other, while the pair of output tines vibrates with one tine going up while the other moves downwardly. As a result, the angular rate sensors drive frequency and the structural torque frequency are unequal. Therefore large displacements of the stem are unnecessary.] An angular rate sensor having a support structure and first and second forks each lying in a plane each having an axis of symmetry with each fork having first and second spaced apart tines. The first and second forks are mechanically coupled to each other to provide a dual fork structure. A mount is provided for mounting the dual fork structure on the support structure. Energy is coupled into the first fork of the dual fork structure to cause vibratory motion of the tines of that fork in the plane of the fork. Vibratory motion of the tines of the other fork in a direction normal to the plane of the other fork is sensed to provide a angular rate about the measure axis of symmetry of the first fork. The mounting serves to isolate the dual fork structure from the support structure.
REFERENCES:
patent: 2544646 (1951-03-01), Barnaby et al.
patent: 3127775 (1964-04-01), Hansen et al.
patent: 3141100 (1964-07-01), Hart
patent: 4654663 (1987-03-01), Alsenz et al.
Chapman John
Piezoelectric Technology Investors, Inc.
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