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Sensor for strip of conductive material

  • US 5,394,095 A
  • Filed: 07/22/1993
  • Issued: 02/28/1995
  • Est. Priority Date: 03/27/1990
  • Status: Expired due to Term
First Claim
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1. A sensor device, comprising:

  • a grounded strip of conductive material where the strip has opposite sides and opposite edges;

    a transmitter electrode disposed on one side of the strip and having portions extending beyond the respective opposite edges of the strip;

    two detector electrodes, each detector electrode being disposed on the side of the strip, opposing the transmitter electrode, the transmitter electrode being capacitively coupled to the strip;

    two shielding electrodes, each shielding electrode being associated with one of the detector electrodes;

    amplifier means having a unity gain factor connected to said shielding electrodes such that the potential on each shielding electrode follows the potential on each respective detector electrode; and

    means connected to each of the detector electrodes for outputting a signal indicating the position of the strip of material relative to the position of the detector electrodes and the transmitting electrode.

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