Method and system for enhanced resolution, automatically-calibrated position sensor
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United States of America Patent
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Dec 2, 2008
Grant Date -
Mar 8, 2007
app pub date -
Nov 22, 2004
filing date -
Nov 20, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system and method for sensing position and/or displacement of a moving, substrate, ram, target, piston, encoder wheel or the like. The system includes a plurality of transducers for generating two sinusoidal signals in quadrature related to the position and displacement of the substrate, ram or the like. Alternatively, the sinusoidal signals may be generated by other well-known devices, such as by an optical encoder or the like. The two sinusoidal signals in quadrature are processed to provide enhanced resolution compared to conventional quadrature systems. The system is also capable of self-calibration in order to accommodate fluctuations in the two sinusoidal signals in quadrature.
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