Single coil position and movement sensor having enhanced dynamic range
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United States of America Patent
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Apr 8, 1997
Issued Date -
N/A
app pub date -
Jun 6, 1995
filing date -
Jan 11, 1989
priority date (Note) -
Expired
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Abstract
A control circuit electrically coupled to the conductive coil of the elongated probe includes an energization circuit for coupling an alternating current signal to the coil. A monitoring circuit monitors a signal from the coil as the alternating current signal is applied to the coil that changes with a degree of overlap between the coupling member and the elongated probe and for providing an output signal related to the relative positions of two moveable members. A feedback control circuit adjusts the alternating current signal coupled to the coil to a control level based on the monitored signal from the monitoring circuit. Use of the feedback control enhances a dynamic range of the output signal from the monitoring circuit.
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