Induction principle, size and design requirements of grounding loop of parking lot system

The ground loop induction principle of the parking lot system is to use the change of magnetic field, that is, when the vehicle passes or stops on the annular buried coil, the iron of the vehicle itself cuts the magnetic field lines, which causes the inductance of the coil loop to change, and the detector can detect the existence of the vehicle by detecting the inductance. In general, the grounding loop requires a length of 2m and a width of 1.5m, and the buried conductor is generally 5 turns. If the vehicle chassis is high, consider increasing the coil accordingly to improve the sensitivity.