It is safe to say that walk-through metal detectors have become a characteristic feature of our time. We encounter them at airports, train stations, stadiums, theaters, shopping centers, and a wide variety of public places. A walk-through metal detector is a device designed to detect prohibited metal objects. Designed to ensure our safety, it sometimes gives us a lot of trouble. Why, in some cases, we go through the search quickly, the first time, while in others we have to stand in line and pass through the arch several times under the disapproving glances of the guards and the sounds of a siren, even if there are no things in our pockets. How do walk-through metal detectors differ from each other? Why do some create inconveniences for us and the security staff, while others do not? This will be discussed in our article.
The prototype of the modern walk-through metal detector appeared in the 1st century AD in China. At the entrance to the Imperial Palace, columns of magnetic iron ore were installed, which attracted any iron objects hidden under clothing. In this way, the emperor's guards identified intruders who attempted on his life.