Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Patent
1976-07-06
1978-06-13
Gill, James J.
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
G01P 1508
Patent
active
040941990
ABSTRACT:
In order to facilitate construction of a compact, lightweight servoed accelerometer with capacitive pick-off, a one-piece support frame, adapted to be inserted within a cylindrical housing, is used to support a pair of capacitor plates and a lightweight longitudinally reinforced pendulum or seismic mass having a paddle on one end. Attached to the pendulum is an axle which in turn is supported between two flexures by means of jeweled pivoted bearings. Also attached to the pendulum is a torque coil which interacts with a magnetic assembly, secured to the support frame, to restore the paddle to the midpoint between the capacitor plates when the pendulum has been subjected to an acceleration force. Secured to the support frame above and parallel to the pendulum is a thick film circuit board containing an integrated circuit and associated hybrid elements for applying time varying voltages to each capacitor so that the currents flowing through the capacitors can be used as a measure of the difference in capacitance due to deflection of the paddle; and in response thereto, generate sufficient current in the torque coil to restore the paddle to the midway point between the capacitor plates.
REFERENCES:
patent: 2831670 (1958-04-01), Bourns et al.
patent: 3209601 (1965-10-01), Stiles
patent: 3331253 (1967-07-01), Morris
patent: 3897690 (1975-08-01), Hanson
patent: 3978715 (1976-09-01), Farstad
Holdren Frederick V.
Hugli Hans W.
Kubler John M.
Larson Martin E.
Van Schoiack Michael M.
Gill James J.
Killingsworth Ted E.
McMurry Michael B.
Peoples William R.
Sundstrand Data Control Inc.
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