Balanced field theft detection system

Details Balanced field theft detection system Balanced field theft detection system

1975-06-12

1977-12-13

Swann, III, Glen R.

Communications: electrical

Systems

Call station

324232, 340258C, 324233, G08B 1324

Patent

active

040632300

ABSTRACT:
Apparatus and method for identifying the presence in a pre-established location of an object having preselected electrical or magnetic properties. By applying two periodically varying electro-magnetic fields of the same frequency to the pre-established location, the presence of the object is determined by unique perturbations of the electro-magnetic fields produced by the object. The applied electro-magnetic field is generally nonuniform in the pre-established location to maximize the interaction between the object and the electro-magnetic field. A pick-up coil is utilized to sense the resulting field perturbations. A magnetometer can be optionally incorporated in a sensing system to inhibit erroneous indications produced by magnetic objects.

REFERENCES:
patent: 3559201 (1971-01-01), Hilliard
patent: 3665449 (1972-05-01), Elder et al.
patent: 3686564 (1972-08-01), Mallick et al.
patent: 3696379 (1972-10-01), Minasy
patent: 3697972 (1972-10-01), Brown
patent: 3763424 (1973-10-01), Bennett et al.
patent: 3818472 (1974-06-01), Mauk
patent: 3868669 (1975-02-01), Minasy
patent: 3911389 (1975-10-01), Mills

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