Method and apparatus for producing electromagnetic surveillance

Details Method and apparatus for producing electromagnetic surveillance Method and apparatus for producing electromagnetic surveillance

1986-09-22

1989-01-03

Hix, L. T.

Inductor devices

Coil or coil turn supports or spacers

340551, 340572, 361143, H01H 4700, H01F 2730, G08B 1324

Patent

active

047959959

ABSTRACT:
A system for producing alternating electromagnetic fields for use in theft detection and surveillance systems, including an arrangement of field-generating inductance coils for disposition on opposite sides of a passage to be monitored by the electromagnetic field produced by such coils. In a preferred such arrangement, upper and lower coils are used on each side of the passage and such coils are mutually distinct from one another and separately energizeable so as to generate separate components of a resulting composite electromagnetic field. The upper and lower coils in each such set are preferably disposed in coplanar alignment with one another but have at least portions of one coil overlapping portions of the other, so as to enhance uniformity in the resulting electromagnetic field. The array of separately-energizeable coils provides for resultant flux vector variation in the magnetic field along three mutually orthogonal axes as a function of coil drive excitation phase variation. The specification further discloses preferred coil-drive circuitry for accomplishing such purposes.

REFERENCES:
patent: 3493955 (1970-02-01), Minasy
patent: 4118693 (1978-10-01), Novikoff
patent: 4300183 (1981-11-01), Richardson

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