Measuring and testing – Instrument proving or calibrating – Speed – velocity – or acceleration
Reexamination Certificate
2005-04-26
2005-04-26
Noland, Thomas P. (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Speed, velocity, or acceleration
C073S001770
Reexamination Certificate
active
06883361
ABSTRACT:
Quadrature error occurs in vibrating gyroscopes because of manufacturing flaws that permit the sensing element (proof mass) to oscillate about an axis that is not orthogonal to the output axis. This creates an oscillation about the output axis that has a component of the sensing element's vibration acceleration. This output axis oscillation, which is in phase with the driven acceleration of the sensing element, is called quadrature torque since it is ninety degrees out of phase with the angular rate induced acceleration. In order to eliminate this output axis oscillation, the present invention generates sinusoidal forces on the dither mass by applying dc voltages on the dither mass pickoff electrodes. These forces create a counter dither motion about the output axis that cancels the output axis oscillation generated by the non-orthogonal dither axis.
REFERENCES:
patent: 4791815 (1988-12-01), Yamaguchi et al.
patent: 5522249 (1996-06-01), Macy
patent: 5712427 (1998-01-01), Matthews
patent: 5955668 (1999-09-01), Hsu et al.
patent: 5987986 (1999-11-01), Wyse et al.
patent: 6067858 (2000-05-01), Clark et al.
patent: 6089089 (2000-07-01), Hsu
patent: 6370937 (2002-04-01), Hsu
patent: 6595056 (2003-07-01), Stewart
patent: 6619121 (2003-09-01), Stewart et al.
patent: 6629460 (2003-10-01), Challoner
patent: 6651500 (2003-11-01), Stewart et al.
patent: 6675630 (2004-01-01), Challoner et al.
patent: 20030033850 (2003-02-01), Challoner et al.
patent: 20030101792 (2003-06-01), Kubena et al.
patent: WO 0057194 (2000-09-01), None
patent: WO 0114831 (2001-03-01), None
patent: WO 0171364 (2001-09-01), None
Derwent-Acc-No. 1976-E1359X, Abstracted-Pub-No: SU 463912A, “Correction Factor of Pendulous Accelerometer Scale—Determined by Measuring Signals in Two Opposite Positions”, Bazhenov.
U.S. Provisional application No. 60/190,271, filed Mar. 17, 2000.
Noland Thomas P.
Northrop Grumman Corporation
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