Ferromagnetic detection pillar

Communications: electrical – Condition responsive indicating system – With particular coupling link

Reexamination Certificate

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Details

C340S551000, C340S561000, C340S565000, C340S567000, C324S228000, C324S260000, C324S301000

Reexamination Certificate

active

11063657

ABSTRACT:
A ferromagnetic detection pillar having one or more applied magnetic field sources and one or more magnetic field sensors, with the magnets and sensors arranged and adapted to detect a ferromagnetic threat object on one side of the pillar. A detection device, such as a motion detector or infrared detector, is also provided, to detect the presence of an object on a selected side of the pillar. A single free-standing pillar can be used, or two or more free-standing pillars can be arranged to constitute a variable aperture detection portal. Single sensors or multiple-sensor configurations can be used.

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