Metal detectors work on the principle of transmitting a magnetic field and analyzing the return signal from the target and the environment. The transmitted magnetic field varies over time, usually at the rates of fairly high-pitched audio signals..The pulse generates a small magnetic field. When a piece of metal passes through this magnetic field, a reflected magnetic field will emerge and this magnetic field will react with the receiver coil, triggering an alarm in the door frame metal detector. This process will happen in a few microseconds
A Door Frame Metal Detector (DFMD) as the name suggests, is a metal detector mounted in a door to detect metal that may be hidden on the body of a person passing through this door. Also known as a "walk through" metal detector
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