Measurement of traffic data using magnetic field sensors that can be used to determine vehicle type in addition to vehicle directions and velocity, by measurement of magnetic flux variations

摘要

The method for traffic data capture by use of magnetic field sensors that are sensitive along at least one axis. Accordingly magnetic field sensors are first used to measure the magnetic field without any vehicles present. A calibration is then carried out and finally the vertical flux focussed field is cyclically monitored. The resulting measurement values are smoothed. To determine vehicle direction, speed and length sequential field sensors are used. An Independent claim is included for a measurement arrangement implementing the above method.