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Frozen material detection using electric field sensor

  • US 20070209446A1
  • Filed: 03/10/2006
  • Published: 09/13/2007
  • Est. Priority Date: 03/10/2006
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a first electrode;

    a second electrode located at a distance from the first electrode, the second electrode forming a capacitive element with the first electrode, wherein a gap is present between the first and second electrodes;

    an electric field sensor having an electrode terminal coupled to the first electrode and providing an electric field output value representative of an amount of frozen material located in the gap between the first and second electrodes;

    a first insulator adjacent the first electrode and outside the gap; and

    a conductive layer adjacent the first insulator, wherein the first insulator is between the first electrode and the conductive layer, and wherein a shield output of the electric field sensor is coupled to the conductive layer.

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