There are different fields that are taking advantage of metal detectors. As an example, you would often seem them being used in airports and several other security checkpoints, military mine fields, beach-combers as well as geophysical prospectors. Also, metal detectors are under detector radar family as many uses radar in the system. Several other members of detector radar family compose of weather radar systems, cordless radar systems and car radar detector systems.
As a matter of fact, metal detectors are made from oscillator that produces alternating current that pass through a coil which creates alternating magnetic field. To put it simply, when electronically conducive metal comes close to the detector, it will create eddies of air that is causing a change in magnetic field. And this is what allows the operator to find where the metal object is located.
In most instances, it is the handheld detectors that are being used often. The truth is, these handheld detectors have the capability of finding landmines. For deep metals on the other hand, the ground penetrating radar is what used together with metal detector to unearth hidden metal.
Metal detectors actually have a quite interesting history. Believe it or not, the first ever metal detectors were presented to public in late 19th century. Original inventors of the concept hoped to create an easier way of finding ore for the miners. Heinrich Wilhelm Dove a physicist who developed induction balance system at that time in which it took over a century before others can see the need for his idea.
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Early iterations of the systems however were complex and consumes lots of battery power. Modern models are beginning to surface in the 1930s. The one first patented the metal detector is Gerhard Fisher. He discovered metal detection only by accident when he found some discrepancies in radio navigational methods he uses. Then, his model was put into used in the Second World War when there were excessive amount of detectors that lie around. And as a result, it has formed a hobby of finding metal for entertainment purposes.
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It is not only a useful tool but entertaining to use. Since almost everyone of us comes contact with metal detectors so it is a bit hard to imagine to not see one. It is also interesting that such detector is also part of detector radar family. Well, this is all because of the fact that different detectors use cordless radar system into their mechanisms. The metal one has an interesting history too and thinking of it next time you stand to a security checkpoint will give you something to contemplate on.