Are you looking for a hobby? You may want to try metal detecting, or what is considered as treasure hunting by many enthusiasts, because this can be a good physical exercise too. When you have to carry the detector, it will be a given that you have to exert an effort to do so. If you keep doing this for a long stretch of time, it will certainly be a fun workout for you.

Functions
Metal detectors are primarily designed to detect if there are metals beneath the ground. These are now best used in the field of defence, where the detectors are used in enemy land mines. They are also used by geophysicists, security personnel and archaeologists. For hobbyists, these detectors can be used to find long buried treasures in the ground.

History
In the last 19th century, scientists first tried the idea of making a device that can detect metals. This started with the invention of a device which can detect ores in rocks below the ground, marking a much more convenient time for miners.

In 1881, another device that works the same way was invented by Alexander Graham Bell. It was attempted for use on American President James Garfield to find out where the bullet in his body was when he was shot. However, it was not successful because the detector keeps being triggered by the president’s metal bed.

In the 1930, Gerard Fisher developed a radio direction finding system for navigation. He realised later on that his machine seemed to deviate from what he intended it to do when it detected something in an area believed to have plenty of ore-bearing rocks. This time, he thought about using this device’s search coil resonator and its radio frequency. In 1937, he got the patent for this detection device, the first for a metal detector.

Later on, Josef Stanislaw Kosacki fine-tuned the design to make it suitable as a metal detector in World War II. He was a Polish lieutenant. His design used vacuum tubes running on batteries. It was used to detect mines in minefields.
However, this device was kept a secret for about fifty years because it was an armed forces research asset. This was such an important device for the armed forces of the country. When the device was debuted, many private firms had their innovative versions ready. Among the first innovators was Oregon based White Electronics, which created a detector called Oremaster Geiger Counter.

German physicist Heinrich Wilhelm Dove came up with the induction balance for magnetism way before the metal detector was invented. His system has two electrically balanced coils which show imbalance upon detecting metals. This induction-balance system only made the metal detectors even more powerful.

The development of the new detector boosted the creation of Beat Frequency Oscillator by Charles Garrett. Eventually, compact and lighter detectors were introduced and they are even more powerful than their predecessors.

Today
Metal detectors have become more sophisticated and compact, with some even computerised. There are also detectors, which can be programmed to detect only particular metals. Other detectors can also be set to certain notch filters, tracking speed, and the like. There are detecting devices now, which have chips that save the data during detection.

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