Antipilferage system utilizing "figure-8" shaped field...

Details Antipilferage system utilizing "figure-8" shaped field... Antipilferage system utilizing "figure-8" shaped field...

G - Physics

08

B

340/124.3

G08B 13/24 (2006.01)

Patent

CA 1113576

ABSTRACT An improved apparatus for producing a magnetic field within an interrogation zone for detecting perturba- tions in the field produced by the presence of a ferro- magnetic marker element is disclosed. This apparatus in- cludes at least a pair of field producing coils, each of which is substantially planar and is positioned on opposite sides of the interrogation zone such that the planes of the coils are parallel to each other and to a corridor defined therebetween. Each of the coils are of substantially the same overall dimension and have either a "figure-8" or "hour-glass" shape, each half of which is symmetric about a horizontal axis passing through a crossing or necked-in portion and consist of a substantially triangular shape.

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