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Edge detector

  • US 6,486,680 B1
  • Filed: 06/13/2000
  • Issued: 11/26/2002
  • Est. Priority Date: 06/13/2000
  • Status: Expired due to Term
First Claim
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1. A capacitance measuring circuit comprising:

  • a) a sensor electrode and a reference electrode, said sensor electrode and said reference electrode being spaced apart so that at least one edge of a material can be at least partially positioned between said sensor electrode and said reference electrode;

    b) a first polarity and a second polarity voltage source; and

    c) a switch controller to electrically ground said reference electrode and to electrically connect said sensor electrode to a capacitor after said first polarity voltage source has been applied to said sensor electrode, and to electrically connect together said capacitor and said sensor electrode after said second polarity voltage source has been applied to said reference electrode and said sensor electrode.

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