Electro-magnetic induction
From Wiki Against Mines
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Metal detectors that utilize electromagnetic induction are the principal means for detecting land mines at the present time. Metal detectors generate a magnetic field that reacts with electric and/or magnetic properties of the target. This reaction causes the generation of a second magnetic field, which is received by the detector. The restriction to metallic objects is a limitation given the increasing development of mines with extremely small amounts of metal. Increasing the sensitivity of a metal detector to detect extremely small amounts of metal in these mines leads to its detecting other objects in the ground. Metal detectors are also limited by the need to be relatively close to the mine target in order to operate effectively.
