Dynamic metal immunity
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United States of America Patent
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May 17, 2011
Grant Date -
May 27, 2004
app pub date -
Nov 22, 2002
filing date -
Nov 22, 2002
priority date (Note) -
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Abstract
The disclosure concerns position-sensing apparatus, having radiators which generate electromagnetic energy fields and a position sensor which generates sensor signals responsive to the energy fields. Reference elements are placed at respective positions near the sensor to generate reference signals responsive to the energy fields. And, a control unit is used to calculate a position of the sensor based on sensor signals and reference element errors in order to account for the effects of interfering metal objects.
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