Walk Through Metal Detector

Walk Through Metal Detectors are used for security screening at access points to search personnel for hidden metallic objects at entrances to airports, public schools, courthouses, Prisons, government offices  and other guarded spaces; to hunt for landmines, archaeological artifacts, and miscellaneous valuables; and for the detection of hidden or unwanted metallic objects .

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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 a magnetic field of its own. If another coil is used to measure the magnetic field (acting as a magnetometer), the change in the magnetic field due to the metallic object can be detected.

Image result for walk through metal detectors

Image result for walk through metal detectors

Image result for walk through metal detectors

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The first industrial metal detectors were developed in the 1960s and were used extensively for mineral prospecting and other industrial applications. Uses include de-mining(the detection of land mines), the detection of weapons such as knives and guns (especially in airport security), geophysical prospecting, archaeology and treasure hunting. Metal detectors are also used to detect foreign bodies in food, and in the construction industry to detect steel reinforcing bars in concrete and pipes and wires buried in walls and floors.

 

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