G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 15/00 (2006.01) G01V 3/00 (2006.01) G01V 3/12 (2006.01) G08B 13/24 (2006.01)
Patent
CA 2183697
In order to detect the presence of a marker, an electronic article-surveillance apparatus includes a transmitting circuit coupled to a transmit antenna, a receiving antenna juxtaposed with respect to the transmit antenna, such that an electromagnetic signal is generated within a controlled area, the signal being received by the receiving antenna, such that when the marker is located within the controlled area, a is created in said electromagnetic signal and is picked up by the receiving antenna. The disturbance is the marker signal. An electronics module receives the electromagnetic signal picked up by the receiving antenna, and a feedback conduit, linking the electronics module with the transmitting circuit, can provide to theelectronics module an input to the transmitting circuit which controls the amplitude of the electromagnetic signal so as to maintain the marker signal at a substantially constant amplitude and shape. A detection module receives the marker signal and can analyze the marker signal in accordance with predetermined criteria. An alarm circuit is actuated by the detection module when the latter confirms the presence of themarker signal in accordance with the predetermined criteria.
Klaehn David P.
Sim & Mcburney
LandOfFree
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