What are the basic principles of inductive sensors?

Inductive sensors use the mutual induction principle of metal conductors and alternating electromagnetic fields. The detection coil located at the front end of the sensor generates a high-frequency magnetic field. When a metal object approaches the magnetic field, eddy currents are generated inside the metal object, causing the magnetic field energy to attenuate. When the metal object continues to approach the sensing surface of the sensor, the energy is absorbed and attenuated. When the attenuation reaches At a certain level, the sensor switch is triggered to output a signal, thereby achieving the purpose of non-contact detection.