Almost all airport metal detectors are based on pulse induction (PI). Typical PI systems use a coil of wire on one side of the arch as the transmitter and receiver. This technology sends powerful, short bursts (pulses) of current through the coil of wire. Each pulse generates a brief magnetic field.
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://www.fixya.com/support/t26956979-walk_metal_detector_work&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNGMgxon-rJUO_YnyadidAmsSu2YwA
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