Surveillance system having acoustic magnetomechanical marker

Details Surveillance system having acoustic magnetomechanical marker Surveillance system having acoustic magnetomechanical marker

1984-03-22

1986-11-11

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1326

Patent

active

046225439

ABSTRACT:
An article surveillance system having an acoustic magnetomechanical marker is adapted, when armed, to resonate at a frequency provided by an incident magnetic field applied within an interrogation zone. The marker is a strip of magnetostrictive ferromagnetic material disposed adjacent to a hard magnetic element which, upon being magnetized, magnetically biases the strip and arms it to mechanically vibrate at said frequency. A substantial change in acoustic output level of the marker at the resonant frequency provides the marker with signal identity.

REFERENCES:
patent: 3713133 (1973-01-01), Nathans
patent: 4510490 (1985-04-01), Anderson, III et al.

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