Seismic sensors
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United States of America Patent
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Nov 6, 2007
Grant Date -
Sep 15, 2005
app pub date -
May 9, 2003
filing date -
May 10, 2002
priority date (Note) -
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Abstract
A method for compensating the effect of gravity on seismic sensors such as geophones and a gravity effect-free seismic sensor are disclosed. The gravity effect-free seismic sensor of the present invention includes primary sensor (100) operatively responsive to seismic movements and hence generating a seismic signal by having a coil placed in a magnetic field in a first axis of sensitivity (105); an auxiliary sensor (210) operatively responsive to a gravity field for generating a tilt signal, thus provide current to the coil of the primary sensor (100) to induce a force on the coil that at least partially compensates for a weight of the coil, thus ameliorating or eliminating a gravity effect on the primary sensor (100).
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