Inductive sensors

Inductive sensors help to measure speed and position, the phenomenon behind the operation of these sensors is based on alternating currents.
This was first noticed by Michael Faraday in 1830, when he discovered that a conductor carried by a first electric current could ‘conduct’ a current passing through a second current conductor. Faraday’s discoveries went on to provide electric motors, dynamos and, of course, inductive position and speed sensors.