Metal detector consists of a handheld unit with a sensor probe that can be swept over the ground or other objects. If the sensor comes near a piece of metal this is indicated by a tone, or a needle moving on an indicator so that we know a metal is present in the area.
The metal detector consists of an oscillator that produces an alternating current which passes through a coil. If a piece of electrically conductive metal is close to the coil, eddy currents will be induced in the metal, this produces a magnetic field. If another coil is used to measure magnetic field acting as magnetometer, change in the magnetic field due to the metallic object will be detected.
Beat frequency oscillation - This is the most basic of metal detectors. The concept behind its working is very easy to understand. This metal detector is considered weak and is the option most commonly used in most electronic shops.
Very Low-Frequency Detectors - This is one of the most popular metal detectors currently in use. This is especially so among experienced treasure seekers. The detector can be highly accurate and sensitive.
Pulse Induction - This is the latest innovation in detecting metallic objects. Guards commonly use this type of detectors for detecting concealed weapons at security checkpoints.
Industrial Metal Detectors - This is the most commonly used types of metal detectors for providing security. For obvious reasons, such detectors cannot be used for finding treasure.
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