How Do Metal Detectors Work?

Answer

Metal detectors work by using electromagnetic induction in order to detect metal and by using an oscillator that has a current that creates a magnetic field. At the end of the current is a coil, if the coil detects that there is metal nearby an additional current is sent along the coil and the metal detector alerts the user of its presence.
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How Do Metal Detectors Work?
VLF, or Very Low Frequency, metal detectors are also known as induction balance detectors. They function by means of the disc-like plate which makes up the bottom of the device. The disc or "Broom" is actually made up of two separate sets of wire coil.... More »
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Source: www.ehow.com
Metal detectors being the fascinating machines they are use a technology called pulse induction. It checks the ground with a large electromagnetic pulse and observes the span of time it takes for the voltage to reduce to ambient levels. If there is a conductive object around the ground it takes longer time for the voltage to decrease.
Metal detectors work by being able to pick up on fields that are released by a metal substance. There are various types of metal detectors that can pick up on these fields in different distances. You can find more information here: http://www.wisegeek.com/how-does-a-metal-detector-work.htm
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