Inductive loop structure for detecting the presence of vehicles

Details Inductive loop structure for detecting the presence of vehicles Inductive loop structure for detecting the presence of vehicles

1975-03-03

1976-10-05

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

340 38L, G01R 3312

Patent

active

039847640

ABSTRACT:
An improved inductive loop structure useful for detecting metal objects such as vehicles on a roadway. The two terminal loop is formed by a conductive wire configured to define two substantially rectangular paths lying side by side in a common plane such that respective sides of the two paths lie adjacent one another. Alternating current is supplied to the terminals of the wire to produce a commonly oriented magnetic field around the adjacent sides of the rectangular paths and an oppositely oriented magnetic field of lesser magnitude around each of the outer sides of said rectangular paths. As a consequence, the field components interact to enhance field strength within the area bounded by said outer sides and reduce field strength outside of that area.

REFERENCES:
patent: 3184730 (1965-05-01), Irish
patent: 3312935 (1967-04-01), Brothman et al.
patent: 3697996 (1972-10-01), Elder et al.
patent: 3863206 (1975-01-01), Rabie

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