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Thermally sensitive array device for presence detection around automatic doors

  • US 7,362,224 B2
  • Filed: 07/20/2005
  • Issued: 04/22/2008
  • Est. Priority Date: 07/22/2004
  • Status: Active Grant
First Claim
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1. A thermally sensitive array of passive infrared sensors for detecting an object around a moveable automatic door, comprising:

  • each of said passive infrared sensors is a thermopile;

    each of said thermopiles located around said moveable automatic door;

    said moveable automatic door is adapted to open and close depending on the detection of said object around said moveable automatic door;

    each of said thermopiles includes at least two thermocouple devices;

    each of said thermocouple devices includes;

    a thermocouple having first and second contacts;

    an isolation layer;

    said thermocouple engaging said isolation layer;

    a substrate;

    said isolation layer engaging said substrate;

    a first source element and a second source element;

    an absorptive cover in engagement with said first source element;

    said first source element and said second source element are thermally coupled to said respective first and second contacts of said thermocouple; and

    , voltage measuring circuitry affixed to said contacts of said thermocouple.

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