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A little information about Metal Detectors

Metal detectors are electronic instruments used to detect the presence of metal. Because of their ability, they have many varied uses. Uses for metal detectors include finding metal hidden within objects such as food or buried underground. Detectors often consist of a handheld unit with a sensor, wherein the sensor can be swept over the ground or other objects. If the sensor comes near a piece of metal an indicator will allow for a visual or audible indication. Detectors usually give some indication of distance or depth as well. The closer the sensor is to the metal, therefore the stronger the indication.

More Metal Detector Info

Another common type of detector is the stationary “walk through” metal detector. Security use of stationary detectors at security access points has changed the world. Prisons, courthouses, and airports all use fixed detectors to detect concealed weapons on a person’s body. The simplest form of a metal detector consists of an oscillator producing an alternating current that passes through a coil.

The coil produces an alternating magnetic field. If a piece of electrically conductive metal is close to the coil, eddy currents will be induced in the metal. The eddy current produces a magnetic field of its own. If another coil is used to measure the magnetic field, acting as a magnetometer. When the magnetic field changes due to the metallic object it can be detected.

Industrial Applications

Industrial metal detectors were first developed in the 1960’s. Mineral prospecting and other industrial applications drove the technology, therefore advancing the technology. The military uses metal detectors to detect land mines and weapons. Military detection of weapons is critical to protect soldiers and assets. to detect knives and guns in airport security.