Surveillance system having magnetomechanical marker

Details Surveillance system having magnetomechanical marker Surveillance system having magnetomechanical marker

G - Physics

08

B

340/124.3

G08B 13/24 (2006.01) G01V 15/00 (2006.01) G06K 7/08 (2006.01) G06K 19/067 (2006.01) H01F 1/153 (2006.01) H03H 9/24 (2006.01) H04B 1/59 (2006.01)

Patent

CA 1200871

ABSTRACT SURVEILLANCE SYSTEM HAVING MAGNETOMECHANICAL MARKER A magnetic article surveillance system marker is adapted, when armed, to resonate at a fre- quency provided by an incident magnetic field applied within an interrogation zone. The marker is an elon- gated ductile strip of magnetostrictive ferromagnetic material disclosed adjacent to a ferromagnetic element which, upon being magnetized, magnetically biases the strip and arms it to resonate at said frequency. A substantial change in effective magnetic permeability of the marker at the resonant frequency provides the marker with signal identity.

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