A metal detector is an electronic device that can detect metal objects by means of electromagnetic impulses. The metal detector is a device with multiple applications, both military (mine detection) and industrial (detection of foreign bodies in food, steel bars in concrete, water pipes and electric cables), security (airports and train stations), scientific (search for archaeological objects) or individuals (detecto-fans). Features Veam you some important features in a metal detector: discrimination: is the ability to differentiate between different types of metal. Discrimination between ferrous and non-ferrous metals is fairly accurate, but the identification of the type of metal is less effective. Ground balance: the ground mineralization affects the signal by the presence of conductive materials such as iron. To compensate, the metal detector allows you to adjust its sensitivity, being able to take stock of land of manually or automatically (auto-track). Detection depth: depends on many factors, such as mineralization, density and soil moisture, technical specifications of the device, shape, position, size and material of the object and the skill of the operator. Interface: generally metal detector communicates with the operator by means of tones, although some models also have an LCD display.
Types look at the main types of metal detector: metals for land or detectors of low frequency, Very Low Frequency (VLF) Detector: employ technology TR (transmission/reception). They have discrimination, ground balance and depth of acceptable screening, although its performance is influenced by the terrain, so are only suitable for ground or dry beach. They usually use a single frequency but there are models multi-frequency (BBS, Broad Band Spectrum) that use 20-30 frequencies, thus improving its performance. Detector metals to great depth or detectors of radio frequency (RF, Radio (Frequency): employ technology TR but with coils distant (at least 70 cm) and perpendicular among themselves. They detect gaps and changes in the composition of the ground, so it is used to detect large objects at depths greater than 1 meter. Underwater metal detector: employ (press Induction PI) pulse induction technology. Lack of discrimination but have much depth of detection and len not influences the terrain, so it used in underwater searches or beaches. Hand held metal detector: in security to detect guns and edged weapons, and construction are used to detect cables, pipes or steel bars in concrete.
Tunnel metal detector: are arcs of detection used in security (airports or places of special surveillance) or in industrial environments (food sectors, chemist, pharmacist, Miner, logger, or recycling). Legality the legality of metal detector is very changeable, but in general, its use without authorization in areas of interest Archaeological is prohibited by the laws of protection of historical heritage. In areas without archaeological interest, such as the beaches, its use is usually allowed or tolerated. Source: Metal Detector original author and source of the article