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Methods and Apparatus for Security Device Portal Sensing

  • US 20090243597A1
  • Filed: 03/30/2009
  • Published: 10/01/2009
  • Est. Priority Date: 04/01/2008
  • Status: Abandoned Application
First Claim
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1. A system for detecting movement of a portal cover, the system comprising:

  • a main unit having a sensor for detecting a magnetic field;

    a remote unit having a magnet that provides the magnetic field; and

    a coupler for communicating the magnetic field to the sensor;

    wherein;

    the main unit is coupled to a first object that includes at least one of a portal structure and a portal cover;

    the remote unit is coupled to a second object that includes at least one of a portal structure and a portal cover;

    at least one of the first object and the second object moves with respect to the other object at a boundary between the first object and the second object;

    while the coupler magnetically couples to the main unit and the remote unit across the boundary, the sensor detects the magnetic field via the coupler; and

    a movement greater than a threshold of at least one of the first object and the second object magnetically decouples the coupler from at least one of the main unit and the remote unit whereby the sensor does not detect the magnetic field.

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