Metal detectors operate based on electromagnetic induction. When a metal object comes into the vicinity of a metal detector's coil, it disrupts the electromagnetic field generated by the coil, leading to a change in the electromagnetic induction within the coil.
How it works:-
Generating an Electromagnetic Field: The metal detector generates an alternating current (AC) in the coil, which creates an electromagnetic field around it.
Induction Effect: When a metal object is brought near the coil, it induces eddy currents within the metal due to the changing magnetic field. These eddy currents produce their own magnetic field, which opposes the original field generated by the coil.
Detection: The disturbance in the electromagnetic field caused by the metal object's presence is detected by the metal detector's circuitry, triggering an alert to notify the operator of the metal's presence.
This principle allows metal detectors to locate and identify metallic objects buried underground, hidden in walls, or concealed within objects.
