Coded surveillance system having magnetomechanical marker

Details Coded surveillance system having magnetomechanical marker Coded surveillance system having magnetomechanical marker

1982-06-03

1985-04-09

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1326

Patent

active

045104905

ABSTRACT:
A magnetic article surveillance system marker is adapted, when armed, to resonate at preselected frequencies provided by an incident magnetic field applied within an interrogation zone. The marker is a plurality of elongated ductile strips of magnetostrictive ferromagnetic material each of the strips being disposed adjacent to a ferromagnetic element which, upon being magnetized, magnetically biases the strips and arms them to resonate at the preselected frequencies. A substantial change in effective magnetic permeability of the marker at the preselected frequencies provides the marker with signal identity.

REFERENCES:
patent: 3856513 (1974-12-01), Chen et al.
patent: 3990065 (1976-11-01), Purinton et al.
patent: 4158434 (1979-06-01), Peterson
patent: 4215342 (1980-07-01), Horowitz
patent: 4298862 (1981-11-01), Gregor et al.
patent: 4321586 (1982-03-01), Cooper et al.

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