Theft detection apparatus using saturable magnetic targets

Details Theft detection apparatus using saturable magnetic targets Theft detection apparatus using saturable magnetic targets

G - Physics

08

B

340/124.3

G08B 13/24 (2006.01) H04B 5/00 (2006.01)

Patent

CA 1168727

- 48 - ABSTRACT An electronic theft detection apparatus for detection of saturable magnetic targets has transmitter and receiver antennas formed of single turn loops of rigid metal pipe. The antennas are rectangular and have a width, in the direction of passage, through the interrogation zone, less than the length of a shopping cart. The transmitter antenna is in the form of a rectangular loop and the receiver antenna is of the same overall size and configura- tion but is bisected with a conductor to form two balanced loops. The antennas are purely inductive and a series resonant circuit is inductively coupled into the transmitter antenna and a parallel resonant circuit is inductively coupled out of the receiver antenna. Special circuits are also provided for temporarily disabling the apparatus when a related lower harmonic frequency signal decreases in amplitude.

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