Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Reexamination Certificate
2008-03-25
2008-03-25
Williams, Hezron (Department: 2856)
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
C073S514180, C073S514190, C073S514210
Reexamination Certificate
active
11188110
ABSTRACT:
A force-balance accelerometer having a pick-off coil responsive to displacement of a seismic mass from a balance position for providing an output corresponding to the displacement, includes a digital signal processor including tow pulse width modulation generators for converting the output of the pick-up coil to a digital signal, and a torque coil responsive to the digital signal for rebalancing the seismic mass by restoring the mass to the balance position. The processor outputs the digital signal as first and second PWM signals, which control the digital signal.
REFERENCES:
patent: 4088027 (1978-05-01), Hernandez et al.
patent: 4282470 (1981-08-01), Reynolds
patent: 4315434 (1982-02-01), Eastman
patent: 5440939 (1995-08-01), Barny et al.
patent: 5831164 (1998-11-01), Reddi et al.
Cameron IP
Shah Samir M.
Williams Hezron
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