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Electric field sensor and vehicle safety system

  • US 7,635,984 B2
  • Filed: 02/20/2007
  • Issued: 12/22/2009
  • Est. Priority Date: 07/12/1999
  • Status: Expired due to Fees
First Claim
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1. An electric field sensor, comprising:

  • a. at least one first electrode;

    b. at least one second electrode;

    c. at least one third electrode, wherein said at least one second electrode is located between said at least one first electrode and said at least one third electrode, said at least one first electrode is located proximate to a region to be sensed by said electric field sensor, and said at least one second electrode is substantially the same size as said at least one first electrode;

    d. a sensing circuit; and

    e. a reference capacitor, wherein the sensing circuit is configured to replace one of the first, second or third electrodes in the sensing circuit with the reference capacitor in order to account for drift in the sensing circuit.

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