Gravity gradiometer accelerometers
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United States of America Patent
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Oct 5, 1999
Grant Date -
N/A
app pub date -
Jul 3, 1997
filing date -
Jun 11, 1997
priority date (Note) -
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Abstract
This invention concerns improvements to gravity gradient instruments (GGI) and in particular to the accelerometers that are paired within these instruments. Accelerometers have a proof mass suspended by a spring within a magnetic field. An internal feedback loop provides a signal related to movement of the proof mass back through a reaction coil retaining the proof mass in the magnetic field, to maintain the proof mass stationary. An external feedback loop adjusts the accelerometer scale factor. The internal feedback loop provides second order compensation to the proof mass and the spring stiffness. In a further aspect the invention is a method of matching accelerometer pairs.
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