Signal fusion of changes in the inductive loop impedance components for vehicle axle detection

The possibility of using the inductive loop sensor as an efficient axle detector of vehicles is presented in the hereby paper. The fundamental condition for using such sensors is the proper selection of its geometrical dimensions. The original conditioning system was applied for cooperating with the sensor. At this system's output two signals (magnetic profiles) proportional the changes in its impedance components are obtained. Identification results of the function parameters allowing the optimal fusion of the conditioner output signals for various vehicle classes, as well as the axle detection algorithm, were also presented. The applying inductive sensors good point is the possibility of detecting lifted axles in vehicles, which is impossible when currently widespread load sensors are applied.