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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Ask.com Answer for: how do metal detectors work
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 »
Difficulty: Easy
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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