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Fence sensor

  • US 6,456,198 B1
  • Filed: 03/27/2001
  • Issued: 09/24/2002
  • Est. Priority Date: 06/23/1998
  • Status: Expired due to Fees
First Claim
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1. A fence sensor, comprising:

  • a detection electrode;

    a reference electrode insulated from the detection electrode;

    a chargeable member insulated from both of the detection electrode and the reference electrode, the chargeable member being arranged such that at least a part of the chargeable member is situated within a detection region of the detection electrode, and the chargeable member being formed from a conductor; and

    a detection circuit for detecting a change in the electrostatic capacitance between the detection electrode and the reference electrode that is generated by the presence of an object to be detected within the detection region.

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