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A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground, and under water. A metal detector consists of a control box, an adjustable shaft, and a variable-shaped pickup coil. When the coil nears metal, the control box signals its presence with a ...
Magnetometers can be used as metal detectors: they can detect only magnetic metals, but can detect such metals at a much greater distance than conventional metal detectors which rely on conductivity; they are capable of detecting large ferrous objects over considerable distances. Side-scan sonar and multi-beam sonar.
A magnetic anomaly detector ( MAD) is an instrument used to detect minute variations in the Earth's magnetic field. [1] The term refers specifically to magnetometers used by military forces to detect submarines (a mass of ferromagnetic material creates a detectable disturbance in the magnetic field ); military MAD equipment is a descendant of ...
Scavenge for gold, coins, and other buried treasure with these metal detectors, including models from Garrett, Nokta, and Minelab.
Sonar ( sound navigation and ranging or sonic navigation and ranging) [2] is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances ( ranging ), communicate with or detect objects on or under the surface of the water, such as other vessels. [3]
Submarine detection system. Submarine detection systems are an aspect of antisubmarine warfare. They are of particular importance in nuclear deterrence, as they directly undermine one of the three arms of the nuclear triad by making counter-force attacks on submarines possible.
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