Gourt > Business > Consumer Goods and Services > 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 are critical but new high tech full body scans are coming - in part because of incident near Detroit. (via @wolfblitzercnn)
jonathancid (jonathancid) Sun, 27 Dec 2009 14:44:01 -0000
Metal detectors are critical but new high tech full body scans are coming - in part because of incident near Detroit. (via @wolfblitzercnn)
I love how you have to take off your shoes and accessories at the airport. Apparently if you're too fashionable it sets off metal detectors.
goodsirdavid (Aaron Wieand) Sun, 27 Dec 2009 13:11:36 -0000
I love how you have to take off your shoes and accessories at the airport. Apparently if you're too fashionable it sets off metal detectors.
Metal detectors are so 1995? http://twitpic.com/vfr98
EnglishErin (Erin English) Sun, 27 Dec 2009 10:21:25 -0000
Metal detectors are so 1995? http://twitpic.com/vfr98
Forget metal detectors and liquid bans. Here's how we can keep terrorists from taking down a plane: Psychics.
luvsan (luvsan) Sun, 27 Dec 2009 08:49:45 -0000
Forget metal detectors and liquid bans. Here's how we can keep terrorists from taking down a plane: Psychics.
RT @wolfblitzercnn: Metal detectors are critical but new high tech full body scans are coming - in part because of incident near Detroit.
obambicom (Obambi.com) Sun, 27 Dec 2009 08:10:17 -0000
RT @wolfblitzercnn: Metal detectors are critical but new high tech full body scans are coming - in part because of incident near Detroit.
RT @DjPhalseiD: Tha b0uncers dnt check us and we (uh) waaalk around tha metal detectors...
DeAanPridgeon (DeAan(Deon)Pridgeon) Sun, 27 Dec 2009 07:56:53 -0000
RT @DjPhalseiD: Tha b0uncers dnt check us and we (uh) waaalk around tha metal detectors...
Bounty Hunter - Site that offers information and links to the Bounty Hunter range of machines.
Meta Description: [ A website dedicated to metal detectors, metal detecting and treasure hunting. ]
C-Scope International - Information on the C-Scope range of treasure hunting and security machines.
Meta Description: [ C.Scope International Ltd have been at the forefront of Metal Detecting and Pipe and Cable Locating technology for more than 25 years. ]
DeepTech - Builder of pulse induction machines, searchcoils and security detectors.
Meta Description: [ A complete illustrated web-site of the firm Deeptech specialised in development of PI detectors, treasuredetectors, weapons detectors, magnetometers, round search coils, square coils with or without magnetometers and others. ]
Fisher - The main site for Fisher equipment. Includes product information and field tests.
Meta Description: [ Fisher Reseach Labratory - Manufacturer of metal detectors for homeland security, industrial use and hobbyists alike ]
Garrett - Manufacturer of hand-held and ground search products for hobby and security uses.
Imaging Locators - Detectors, Ground Penetrating Radar and Imaging Equipment for treasure hunting and utility use.
Meta Description: [ Metal detectors, Ground Penetrating Radar, Underground Imaging Equipment
for treasure hunting, utility and tunnel locating on a laptop computer ]
Maz Headphones - Maz Electronic Systems Ltd: Worldwide distributors of specialist headphones used in metal detecting.
Meta Description: [ Maz Electronic Systems Ltd: Worldwide distributors of Maz specialist headphones used in metal detecting and the music industry ]
500
Minelab - Both hobby and industrial uses. With machine specifications, field tests and support information.
Meta Description: [ Minelab metal detectors use advanced technology to help you find all the gold, silver, jewelry and valuable treasures hidden underground or underwater. Never find unwanted foil, pull tabs or trash again with the Explorer II. Home of Halcro amplifiers - the best audio product on the market. ]
Ozdemirli - Provides metal detection treasure hunting.
Meta Description: [ gold mineral exploring prospecting with magnetic metal detector ]
Simmons Scientific Products - Manufacturer of dowsing rods and directional treasure locators.
Meta Description: [ dowsing finds hidden treasure or gold prospecting. Treasure hunting for treasure chest by dowsing ]
Tesoro - Offers product information, dealer list, glossary of terms, and FAQ.
Meta Description: [ Lightweight metal detector models for treasure hunting, coins, relics, gold, silver, artifacts, diving, beach combing. ]
Troy Custom Detectors - Information on the Shadow line of detectors - X3 and X5. Includes specifications, manuals and a user forum.
Viking Metal Detectors - UK based maker of hobby detectors. With links to product information and support.
Meta Description: [ Possibly the best known and longest established name in the Metal Detecting Industry. Manufacturers and suppliers to hobbyists, water authorities, local councils and many other service industries throughout the UK for over 25 years. ]
Whites Electronics - Machines for hobby, security, and industrial applications. With product and accessory information.
Meta Description: [ White's Electronics, manufacturer of the World's Best Metal Detectors. ]
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