Signal Loops

An induction or inductive loop is an electromagnetic communication or detection system which uses a moving magnet or an alternating current to induce an electric current in a nearby wire. Induction loops are used for transmission and reception of communication signals, or for detection of metal objects in metal detectors or vehicle presence indicators. Vehicle detection loops, called inductive-loop traffic detectors, can detect vehicles passing or arriving at a certain point, for instance approaching a traffic light or in motorway traffic. An insulated, electrically conducting loop is installed in the pavement. The electronics unit applies alternating current electrical energy onto the wire loops at frequencies between 10 kHz to 200 kHz, depending on the model. The inductive-loop system behaves as a tuned electrical circuit in which the loop wire and lead-in cable are the inductive elements. When a vehicle passes over the loop or is stopped within the loop, some of the vehicle's ferrous body material increases the loop's inductance, in the same principle as including a metal core within a solenoid coil.

With a modern and state of the art equipment, your signal loop installation is environmentally clean. We utilize 300 gallon vac trucks to contain and haul off slurry created during the cutting process. We do quad loops, 6’ circle loops, and bike loops. Our happy clients include ODOT, many city governments as well as other private contractors. We will work anywhere in Oregon and Washington. Please call for more information about or induction loop installations.

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