Security metal detector work for the safety of people. Walkthrough, handheld, the scanner is the security metal detector and that use in the airport. http://myhobby.dudaone.com/
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. https://detectorly.com/beginners-guide-metal-detecting
A metal detector is a piece of equipment that responds to metal that isn't necessarily easy to see. They are used for all sorts of things such as; airport security, detecting land mines, and in the construction industry.
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