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The most common type of metal detector is a hand-held metal detector or coil-based detectors using oval-shaped disks with built-in copper coils. The search coil works as sensing probe and must be moved over the ground to detect potential metal targets buried underground.
Although the actual inventor of the hand-held metal detector is disputed, the hand-held metal detector was made in 1925 and was first patented by Dr. Gerhard Fisher in 1931. A metal detector had been invented some forty years earlier (1881) by Alexander Graham Bell for the sole purpose of locating a lead bullet in President James A. Garfield.
Non-linear Junction Detector (NLJD): A portable NLJD allows the operator to search voids and areas where they are unable to gain physical or visual access, in order to detect electronic components and determine if the area is free from IEDs. Laser IED Detection: Scientists are learning to adapt lasers to detect, or defeat, IEDs. [19]
The Fido explosives detector has been recognized by multiple awards since its inception in the early 2000s. The handheld version of the system was named one of the top ten greatest inventions by the U.S. Army in 2005, and the Packbot robotic platform with the integrated Fido explosives detector received the same award in 2006.
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