Capacitive position sensor and sensing methodology
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United States of America Patent
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Sep 2, 2008
Grant Date -
May 3, 2007
app pub date -
Nov 27, 2006
filing date -
Jul 1, 2003
priority date (Note) -
Expired
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Abstract
A simple and robust variable coaxial capacitive sensor and detection method for monitoring the position of a rapidly reciprocating member such as a piston or displacer in a free piston Stirling engine. The coaxial capacitor of the present invention in a preferred embodiment thereof is configured to modulate capacitive electrode area rather than inter-electrode spacing and as a result a highly linear transfer function can be achieved. Also disclosed are detection methods which derive and process signals in connection with applications which have small sensor capacitance variations while suppressing stray capacitance error.
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