Design And Construction Of A Metal Detector With Siren Alarm

ABSTRACT

The project concerns the design and construction of a metal detector with siren alarm. A metal detector is a device which responds to metal that may not be readily apparent. The simplest form of a metal detector consists of an oscillator producing an alternating current that passes through a coil producing an alternating magnetic field. If a piece of electrically conductive metal is close to the coil, eddy currents will be induced in the metal and this produces an alternating magnetic field of its own. If another coil is used to measure the magnetic field, the change in the magnetic field due to the metallic object will be detected. The system will be use in banks, institutions, homes and airports purposes to restrict unauthorized personnel from gaining access to sensitive business and personal information in our society.