metal detector

Asked by  | 29th Nov, 2009, 09:05: PM

Expert Answer:

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 can be detected.

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Answered by  | 29th Nov, 2009, 09:16: PM

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