Vehicle Ground Loop Detection Circuit

If the resistance is less than 50 megaohms the loop is shorted to ground.

Vehicle ground loop detection circuit.

This project an induction loop vehicle detector from 1983 is really a large metal detector buried in the ground. An insulated electrically conducting loop is installed in the pavement. If the resistance is less than 50 megohms the loop is shorted to ground and must be replaced. How to make a vehicle ground loop detection sensor circuit duration.

Direction dependent vehicle detection. Here s a step by step video on how to loop detector as open. The flux 11 is a single channel 11 pin plug in highly sensitive inductive loop detector designed for vehicle detection applications and interfaces seamlessly with the standard loop detector 11 pin bases found in the majority of traffic control systems. Leads to each loop.

Good practice dictates multiple loops and detectors in this situation. Find loop vehicle loop detector equipment here. This loop detector is responsive highly sensitive and utilises sophisticated software algorithms which adapt to prevent false triggering. A series of blinking led s is an indication of possible loop problems.

When a vehicle with metal parts approaches or stops within the wire loop the frequency of the oscillating circuit changes. 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. The presence of a car lowers the inductance of the loop embedded in the road which then alters the operating frequency of the circuit. In other words the relay circuit output will be closed opened the entire time that a vehicle is present over the loop and does not switch again until the vehicle drives away.

Best performance is obtained by shortening the leads as much as possible and providing the lowest impedance to ground. The wire loops embedded in the ground act as the inductive mechanism for a high frequency oscillating circuit. In either case the loop or the extension cable must be replaced. The common either the bolt green wire or center clip connection must be connected to earth ground.

If the inductive loop is placed correctly it will detect vehicle open gate and keep it open until the vehicle clears the gate. The electronics unit applies alternating current electrical energy onto the wire loops at frequencies between 10 khz to 200 khz.