Target sensor
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United States of America Patent
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May 12, 2015
Grant Date -
Mar 28, 2013
app pub date -
Sep 28, 2012
filing date -
Sep 28, 2011
priority date (Note) -
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Abstract
Target sensor comprising: sensor probe having a resonance frequency that changes as the separation of the sensor probe and a target changes. Oscillator arranged to apply a radio frequency (RF) signal to the sensor probe, the oscillator having: control circuitry configured to regulate the frequency of the RF signal applied to the sensor probe to below the resonance frequency of the sensor probe. Detector arranged to detect an electrical characteristic of the oscillator that varies with the impedance of the sensor probe indicating an interaction of the sensor probe with the target.
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