Measuring and testing – Gravitational determination
Patent
1997-07-03
1999-10-05
Williams, Hezron
Measuring and testing
Gravitational determination
73178R, 73382G, G01V 700
Patent
active
059627824
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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Adams Gregory John
Goodwin Graham Clifford
Lee James Beresford
O'Keefe Graeme Joseph
Turner Robert John
Kwok Helen C.
The Broken Hill Proprietary Company Limited
Williams Hezron
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