G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 15/00 (2006.01) G07D 7/04 (2006.01)
Patent
CA 2319288
The authenticity of an item which is one of a group of such items can be determined by attaching to or incorporating into each such item an authentication marker, all such markers interacting substantially identically with a given magnetic field. A field generating apparatus is provided which incorporates a reference sample that interacts with the given magnetic field in the same way as the authentication markers do. The field generating apparatus subjects both the reference sample and a candidate authentication marker to substantially identical magnetic search fields. A receiver apparatus detects the signals resulting from the interactions of the reference sample and the candidate marker with their respective magnetic search fields, so that, with the candidate marker positioned at a predetermined location with respect to the field-generating apparatus, substantially identical magnetic fields can be generated around the reference sample and the candidate marker, whereupon the receiver apparatus detects the signals. Comparing means are provided for comparing the signals to determine the authenticity of the candidate marker. In a preferred form, the field-generating apparatus and the receiver apparatus both include portions of an H-shaped ferromagnetic core. The field generating apparatus includes a coil encircling the cross bar of the H, while the receiver apparatus includes first and second receiver coils respectively encircling opposite ends of one of the upright bars of the H. The receiver coils are wired in series such that their signals cancel if the reference sample is identical to the candidate authentication marker.
Roseman Mark A.
Roseman Morton F.
Roseman Mark A.
Roseman Morton F.
Sim & Mcburney
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