What is a Metal Detector?
A metal detector uses an electromagnetic field to detect the presence of a concealed metal object. The range depends on the strength of the field, and is usually less than one meter from the search head. The three detection methods are beat frequency oscillation, very low frequency, and pulse induction. Metal detectors were first introduced around 1930 and are used in many different applications.
A metal detector is a portable electronic device which penetrates the ground magnetically in order to find traces of metal. This metal could either be discarded pieces of aluminum or valuable coins, jewelry and other buried treasures. Part of the appeal of metal detecting is this unknown factor, keeping amateurs and professionals on a constant scan for new sources of metal and more promising locations. These devices can usually penetrate sand, soil, wood and other non-metallic substances, making most areas fair game for treasure hunters. A basic metal detector consists of an electronic box and battery case on one end, with a brace or handle for the operator’s arm. An insulated wire wraps around a telescoping shaft and into a round plastic disk called the coil. This disk comes off the shaft at an angle which allows it to be held parallel to the ground. The operator straps on or grips the electronic box and turns on the power. The idea is to slowly sweep the coil end over the ground unti
