whichMetal detectors
The principle of a metal detector is quite simple. Inside the machine are wire coils. A transmitter sends an electronic current through the coils.
The current flow current creates an electromagnetic field. The direction of the current flow is reversed several thousand times every second.
After a few seconds,this current or pulse slows down and disperses. Any metallic object like keys,coins,a knife or even a cell phone which happens
to enter this electromagnetic field will influence the speed of the current. If the pulse hits a metallic object,it will take a few milliseconds longer
for the magnetic pulse to go away. This delay sets off an alarm. happens
to enter this electromagnetic field will influence the speed of the current. If the pulse hits a metallic object,it will take a few milliseconds longer
for the magnetic pulse to go away. This delay sets off an alarm.