Metal Detector

A **metal detector** is an electronic instrument designed to detect the presence of metal objects nearby. They are commonly used for locating metal inclusions hidden within objects or metal objects buried underground. The operation of metal detectors is based on the principles of electromagnetic induction. The device contains inductor coils that interact with metallic objects in the ground. Inside the metal detector's loop is a transmitter coil. When an electric current flows through this coil, it generates an electromagnetic field. As the current alternates direction, the magnetic field it produces also changes polarity — pointing into the ground during one cycle and outward in the next. If a metallic object is present, this changing magnetic field induces a current in the object, which in turn generates its own magnetic field with a polarity opposite to the transmission field. This interaction creates electric impulses in the receiving coil of the detector, signaling the presence of metal.