A Door Frame Metal Detector (DFMD) as the name suggests is a metal detector fitted in a door to detect metal that may be hidden on the body of the person passing through this door. The impulse produces a brief magnetic field. When a particle of metal passes through this magnetic field, a reflected magnetic field will emerge, and this reflected magnetic field will interact with the reception coil, causing the door frame metal detector to sound an alert. The sensitivity of a DFMD can be adjusted to detect particular metal objects like weapons, bombs, guns, etc. Door frame metal detectors are efficiently used in preventing weapons, bombs, etc. from entering security areas.