Eddy current detection and compensation
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United States of America Patent
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Dec 23, 2008
Grant Date -
Jun 1, 2006
app pub date -
Jan 13, 2006
filing date -
Apr 17, 2003
priority date (Note) -
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Abstract
A distortion compensation method includes determining an undisturbed phase for at least one of a first position indication signal and a second position indication signal. The method includes determining an undisturbed ratio that relates the amplitude of the first position indication signal at a first frequency to the amplitude of the second position indication signal at a second frequency. The method also includes determining a disturbed amplitude of the position indication signal and adjusting a position indication based on the disturbed amplitude and phase, the undisturbed amplitude ratio, and the undisturbed phase. The method further comprises determining a relationship between the eddy current phase of the first position indication signal and the second position indication signal.
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