Device and method for passively activating inductive loop sensor

Details Device and method for passively activating inductive loop sensor Device and method for passively activating inductive loop sensor

1994-10-27

1997-07-29

Hofsass, Jeffery

Communications: electrical

Vehicle detectors

340561, 340939, 340941, 324236, G08G 100

Patent

active

056525770

ABSTRACT:
A device and method for passively activating an inductive loop vehicle sensor. The sensor has an inductive loop in a roadway that produces an electro-magnetic field and utilizes the changes caused by the interaction of a detectable vehicle with the field to activate it. The device includes at least one metallic foil having sufficient area and thickness to cause changes sufficiently similar to changes caused by a detectable vehicle to activate the sensor when said foil is placed within the electro-magnetic field. The method includes providing such a device and deploying the device in a plane substantially parallel to the roadway and within the field of the loop.

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