Geophone with mass position sensing
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United States of America Patent
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Mar 17, 2009
Grant Date -
Sep 27, 2007
app pub date -
Dec 29, 2006
filing date -
Dec 30, 2005
priority date (Note) -
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Abstract
A motion sensing element with position sensing includes a case, a magnet positioned within the case, a spring assembly having an electrically conductive member and a coil assembly coupled to the spring assembly. The coil assembly and magnet are moveable with respect to one another. A capacitor plate is proximate the electrically conductive member with a distance between the capacitor plate and electrically conductive member being variable as the magnet and coil assembly move. Leads connect the capacitor plate and electrically conductive member to a sensing circuit for estimating the relative positions of the magnet and coil assembly.
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