Bias reduction in force rebalanced accelerometers
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United States of America Patent
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May 17, 2016
Grant Date -
Jun 19, 2014
app pub date -
Dec 19, 2012
filing date -
Dec 19, 2012
priority date (Note) -
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Abstract
A system is provided for the continuous reduction, in real time, of bias in a force rebalanced accelerometers having a proof mass coupled to an accelerometer housing by a flexure suspension. The system comprises a closed loop, force rebalance servo that provides control voltage to the proof mass to null an electrical pickoff signal that indicates the motion of the proof mass with respect to the accelerometer housing, wherein a time varying disturbance signal is injected into the force rebalance servo that results in the generation of a time varying voltage in the output of the force rebalance servo that corresponds to a magnitude of the net positive spring of the combined flexure suspension and electrostatic springs acting on the proofmass. The system also comprises a negative electrostatic spring servo that applies a negative electrostatic spring DC voltage to each of a pair of negative electrostatic forcer electrodes.
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