Download Do Detector De Metal
Heidi Blessing
Kellyco Metal Detectors features only the very best treasure hunting equipment so that you can find coins, rings, jewelry and relics, both on land and underwater. From gold pans to metal detectors, we carry the best selling products on the market.
Check out a few of our top sellers such as the popular Garrett AT Pro Metal Detector & Minelab Equinox 800, the beach ready Minelab Excalibur II and find gold with the Minelab Gold Monster 1000 Metal Detector. Be sure to check out the all-new Nokta Makro Simplex, an easy-to-use, budget-friendly metal detector that performs like an advanced metal detector.
Our extensive product line ranges from the biggest brands in metal detecting, gold prospecting, to industrial and security metal detectors. Check out more of our top metal detectors for sale by category:
Our factory trained detectorists and experts are here to assist you with your questions and help you decide on which product is best for your detecting needs! We are available on the phones from 9:00 AM - 5:00 PM Eastern Time Monday through Friday.
The Gold Monster 1000 penetrates a good three feet into the earth in ideal conditions, and even when there are lots of rocks, minerals, and other metals present, it can sniff out gold. Expensive but effective, this is a lightweight, balanced metal detector that just might pay for itself if you have a great strike.
Metal detectors can be fun to use and extremely useful. They can be used to find gold and silver, search out historical artifacts, recover a lost wedding ring, or detect buried wires or pipes to ensure safety while digging for landscaping or construction. The best metal detector for your use need not cost much; just make sure you consider its detection modes, waterproof rating, and ease of use balanced against its capabilities.
Metal detectors are perfectly legal to use in most parts of the United States, although there may be permitting requirements or other restrictions in some areas. Take extra care checking the rules in public parks, on public beaches, and on tribal lands, and of course, seek permission before detecting on any private property. Permits can often easily be acquired for detecting in areas where the activity would otherwise be restricted.
A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground, and under water. The unit itself consists of a control box, and an adjustable shaft, which holds a pickup coil, which can vary in shape and size. If the pickup coil comes near a piece of metal, the control box will register its presence by a changing tone, a flashing light, and or by a needle moving on an indicator. Usually the device gives some indication of distance; the closer the metal is, the higher the tone in the earphone or the higher the needle goes. Another common type are stationary "walk through" metal detectors used at access points in prisons, courthouses, airports and psychiatric hospitals to detect concealed metal weapons on a person's body.
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 (inductive sensor) 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.
The first industrial metal detectors were developed in the 1960s and were used extensively for mineral prospecting and other industrial applications. Uses include detecting 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.
In 1841 Professor Heinrich Wilhelm Dove published an invention he called the "differential inductor".[1] It was a 4-coil induction balance, with 2 glass tubes each having 2 well-insulated copper wire solenoids wound around them. Charged Leyden jars (high-voltage capacitors) were discharged through the 2 primary coils; this current surge induced a voltage in the secondary coils.[2] When the secondary coils were wired in opposition, the induced voltages cancelled as confirmed by the Professor holding the ends of the secondary coils. When a piece of metal was placed inside one glass tube the Professor received a shock. This then was the first magnetic induction metal detector, and the first pulse induction metal detector.
In late 1878 and early 1879 Professor (of music) David Edward Hughes published his experiments with the 4-coil induction balance.[3] He used his own recent invention the microphone and a ticking clock to generate regular pulses and a telephone receiver as detector. To measure the strength of the signals he invented a coaxial 3-coil induction balance which he called the "electric sonometer".[4] Hughes did much to popularize the induction balance, quickly leading to practical devices that could identify counterfeit coins. In 1880 Mr. J. Munro, C.E. suggested the use of the 4-coil induction balance for metal prospecting.[5] Hughes's coaxial 3-coil induction balance would also see use in metal detecting.
In July 1881 Alexander Graham Bell initially used a 4-coil induction balance to attempt to locate a bullet lodged in the chest of American President James Garfield.[6] After much experimenting the best bullet detection range he achieved was only 2 inches. He then used his own earlier discovery, the partially overlapping 2-coil induction balance, and the detection range increased to 5 inches. But the attempt was still unsuccessful because the metal coil spring bed Garfield was lying on confused the detector. Bell's 2-coil induction balance would go on to evolve into the popular double D coil.
On December 16, 1881, Captain Charles Ambrose McEvoy applied for British Patent No. 5518, Apparatus for Searching for Submerged Torpedoes, &c., which was granted Jun 16 1882. His US269439 patent application of Jul 12 1882 was granted Dec 19 1882.[7] It was a 4-coil induction balance for detecting submerged metallic torpedoes and iron ships and the like.[8] Given the development time involved this may have been the earliest known device specifically constructed as a metal detector using magnetic induction.
In 1915 Professor Camille Gutton developed a 4-coil induction balance to detect unexploded shells in farmland of former battlefields in France.[10] Unusually both coil pairs were used for detection.[11] The 1919 photo at the right is a later version of Gutton's detector.
The modern development of the metal detector began in the 1920s. Gerhard Fischer had developed a system of radio direction-finding, which was to be used for accurate navigation. The system worked extremely well, but Fischer noticed there were anomalies in areas where the terrain contained ore-bearing rocks. He reasoned that if a radio beam could be distorted by metal, then it should be possible to design a machine which would detect metal using a search coil resonating at a radio frequency. In 1925 he applied for, and was granted, the first patent for an electronic metal detector. Although Gerhard Fischer was the first person granted a patent for an electronic metal detector, the first to apply was Shirl Herr, a businessman from Crawfordsville, Indiana. His application for a hand-held Hidden-Metal Detector was filed in February 1924, but not patented until July 1928. Herr assisted Italian leader Benito Mussolini in recovering items remaining from the Emperor Caligula's galleys at the bottom of Lake Nemi, Italy in August 1929. Herr's invention was used by Admiral Richard Byrd's Second Antarctic Expedition in 1933, when it was used to locate objects left behind by earlier explorers. It was effective up to a depth of eight feet.[12]However, it was one Lieutenant Józef Stanisław Kosacki, a Polish officer attached to a unit stationed in St Andrews, Fife, Scotland, during the early years of World War II, who refined the design into a practical Polish mine detector.[13]These units were still quite heavy, as they ran on vacuum tubes, and needed separate battery packs.
Many manufacturers of these new devices brought their own ideas to the market. White's Electronics of Oregon began in the 1950s by building a machine called the Oremaster Geiger Counter. Another leader in detector technology was Charles Garrett, who pioneered the BFO (beat frequency oscillator) machine. With the invention and development of the transistor in the 1950s and 1960s, metal detector manufacturers and designers made smaller, lighter machines with improved circuitry, running on small battery packs. Companies sprang up all over the United States and Britain to supply the growing demand. Beat Frequency Induction requires movement of the detector coil; akin to how swinging a conductor near a magnet induces an electric current; except the pulse is electric EMF and not magnetic EMF[further explanation needed].
Modern top models are fully computerized, using integrated circuit technology to allow the user to set sensitivity, discrimination, track speed, threshold volume, notch filters, etc., and hold these parameters in memory for future use. Compared to just a decade ago, detectors are lighter, deeper-seeking, use less battery power, and discriminate better.
State-of-the-art metal detectors have further incorporated extensive wireless technologies for the earphones, connect to Wi-Fi networks and Bluetooth devices. Some also utilize built in GPS locator technology to keep track of searching location and the location of items found. Some connect to smartphone applications to further extend functionality.
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