Gourt > Shopping > Recreation > Outdoors > Metal Detectors
Metal detectors use electromagnetic induction to detect metal. Uses include demining (the detection of land mines), the detection of weapons such as knives and guns, especially at airports, geophysical prospecting, archeology 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.
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 metal, which is electrically conductive, 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 (acting as a magnetometer) the change in the magnetic field due to the metalic object can be detected.
History and development
The first detectors
Metal detectors have been around for much longer than most people realize. Towards the end of the 19th century, many scientists and engineers used their growing knowledge of electrical theory in an attempt to devise a machine which would pinpoint metal. The use of such a device to find ore-bearing rocks would give a huge advantage to any miner who employed it. The German physicist Heinrich Wilhelm Dove invented the induction balance system, which was incorporated into metal detectors a hundred years later. Early machines were crude and used a lot of battery power, and only worked to a very limited degree. The Scottish physicist, Alexander Graham Bell, used such a device to attempt to locate a bullet lodged in the back of American President James Garfield in 1881. More on [ Metal detector ]
Metal Detectors :: Outdoors
Metal Detecting :: Outdoors
@BDUTT agree barkha on security issue.. same is case wid metal detectors at cst n churchgate..
prnkchvn (Sush) Fri, 01 Jan 2010 18:59:44 -0000
@BDUTT agree barkha on security issue.. same is case wid metal detectors at cst n churchgate..
RT @BDUTT: the metal detectors are there. but no one seems to use them. such an easy target our country is
mileage100 (Tanmoy Singh) Fri, 01 Jan 2010 18:59:17 -0000
RT @BDUTT: the metal detectors are there. but no one seems to use them. such an easy target our country is
@BDUTT It's just not about Old Delhi Rly Stn...It's prevalant all over the country and ppl also avoid Metal detectors
mailvinci (Vineet Handa) Fri, 01 Jan 2010 18:55:3
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