G - Physics – 01 – N
Patent
G - Physics
01
N
340/124.3
G01N 27/72 (2006.01) G01V 3/10 (2006.01) G08B 13/24 (2006.01)
Patent
CA 1257361
METHOD AND APPARATUS FOR PRODUCING ELECTROMAGNETIC SURVEILLANCE FIELDS ABSTRACT A coil panel for producing alternating electromagnetic fields for use in theft detection and surveillance systems. Series-type electrical drive circuits for energizing the field- generating coil windings with maximum efficiency and control are described, and transformer-type coupling between the different field-generating coils and coil drive circuits effect balanced and equalized current flow in the different coil windings, to enhance both drive efficiency and field uniformity. Additionally, a current-sense winding provides for monitoring of field coil current flow, and for feedback control. Preferably the fields are generated by at least two coils on each opposite side of the field, and the coils are in generally end-to-end co-planar alignment and are overlapped. This provides increased field uniformity by constructively utilizing the mutual inductance component between the different coils, and the phase of the drive signal applied to the different coils may be selectively varied to control the resultant flux vector of the electromagnetic field generated by the coils.
564750
Eccleston Larry
Ii. Cook James C.
Ii. Goodrich Earl R.
Borden Ladner Gervais Llp
Progressive Dynamics Inc.
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