Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect
Patent
1993-11-15
1995-04-25
Chapman, John E.
Measuring and testing
Speed, velocity, or acceleration
Angular rate using gyroscopic or coriolis effect
73 1D, 310370, G01P 904
Patent
active
054088763
ABSTRACT:
Single ended tuning fork inertial sensor having a housing and a single ended tuning fork of a quartz-like material of a predetermined thickness, the tuning fork has first and second tines lying in a plane and having an axis of symmetry and has a body formed integral with said first and second tines. The body is rigidly secured to the housing. The tines have a rectangular cross section and have a width which is different from the thickness. The body has a stem formed therein which has a width less than that of the body. Drive electrodes are secured to the tines. An oscillatory frequency is supplied to the above drive electrodes to excite the tines in a drive mode and in the presence of an axial angular rate to cause the tines to operate in a pickup mode which is substantially separated in frequency from the drive mode. The width and thickness of the tines are chosen so as to provide a frequency difference between the frequency of the pickup mode and the frequency of the drive mode, and width and length of the stem are chosen so as to a reduce the frequency difference.
REFERENCES:
patent: 3683213 (1972-08-01), Staudte
patent: 4379244 (1983-04-01), Dinger
patent: 4674331 (1987-06-01), Watson
Chapman John E.
New SD Inc.
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