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In its simplest form, 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. Many people use consumer metal detectors to look for coins on the beach. Most metal detectors are good to detect metal only within a foot or so below the ground. The detection depth depends on the type of metal detector, type of metal in the buried object, size of buried object, type of metals in the ground, and other objects in the ground.
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