Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Patent
1976-09-29
1978-05-09
Gill, James J.
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
G01P 1508
Patent
active
040880273
ABSTRACT:
A force balance servo accelerometer including a D'Arsonval type mechanism for rebalancing, between a pair of sensing coils, a seismic mass moved by acceleration is disclosed. The D'Arsonval type mechanism comprises a pair of suspension beams mounted in parallel planes in a liquid filled cylindrical housing. A pair of axially aligned taut wires support a torque coil between the suspension beams. The coil surrounds a permanent magnet fixedly mounted in the housing. An arm extending outwardly from the coil, transverse to the axis of the taut wires, supports the seismic mass between the sensing coils, which are mounted in the housing. The sensing coils form two arms of a bridge circuit energized by an oscillator connected across one pair of opposing terminals of the bridge. The signal developed across the other pair of opposing terminals is applied to a differential amplifier. The resultant difference signal is sine wave multiplied with the output of the oscillator in a quadrature detector. The output of the quadrature detector, which is related to the acceleration of the seismic mass, is applied to the coil of the D'Arsonval mechanism to rebalance the seismic mass. A bellows mounted on one end of the housing allows the liquid in the housing to expand and contract as the temperature of the environment in which the D'Arsonval type mechanism is located changes.
REFERENCES:
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patent: 2946226 (1960-07-01), Wendt et al.
patent: 3113462 (1963-12-01), Wendt
patent: 3246525 (1966-04-01), Clark
patent: 3618402 (1971-11-01), Kase
patent: 3797321 (1974-03-01), Morris
Gichard F. Daric
Hernandez E. Norman
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