It has a transmission coil that creates a electromagnetic field via a high frequency alternating current.
when in close proximity to metal a current is induced into the metal that produces an electromagnetic field.
The metal detector has a receiving coil that gets an alternating current induced from the produced electromagnetic field.
the user plugs in a speaker or headphone and hears the change in tone when metal is detected.
Also the receiving coil is designed to cancel ot the transmitting coil electromagnetic field .
Mainly metal detector is used to find hidden object or treasure. It may be precious metal or non precious metal as like non ferrous in non magnetic things. The operation of metal detectors is based upon the principles of electromagnetic induction. Metal detectors contain one or more inductor coils that are used to interact with metallic elements on the ground. The single-coil detector illustrated below is a simplified version of one used in a real metal detector. Best Waterproof Metal Detectorin 2017 Reviewed By Expert
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