G - Physics – 08 – B
Patent
G - Physics
08
B
340/124.3
G08B 13/24 (2006.01)
Patent
CA 1173931
ABSTRACT OF THE DISCLOSURE Apparatus for detecting the presence within a surveil- lance zone of a body of high permeability material creates a surveillance field varying sinusoidally at a fundamental fre- quency. Parallel filter channels select the second and third harmonic components of the perturbations created by said material when present in the field and the phase of the second harmonic relative to a reference signal is compared. The signal level of each of the second and third harmonic components as well as the aforesaid phase congruency cooperatively control an alarm circuit. Rhomboid shaped transmitter coils surrounding figure "8" receiver coils improve coupling to the high permeability body.
386506
Sensormatic Electronics Corporation
Smart & Biggar
LandOfFree
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