Field generation and reception system for electronic article...

Details Field generation and reception system for electronic article... Field generation and reception system for electronic article...

G - Physics

08

B

340/124.3

G08B 13/24 (2006.01)

Patent

CA 2039760

An electronic surveillance system includes a signal generator for generating a magnetic field, a signal receiver within the influence of the magnetic field, and a ferromagnetic marker adapted to pass in said field for detection. The signal receiver in- cludes an arrangement for generating a non-rotating field at a first frequency, and a rotating field at a second frequency that is lower than the first fre- quency.

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