Metal detection safety doors are mainly used in airports, railway stations, large conferences and other public places with large crowds to check metal objects hidden in people, such as guns and controlled knives.
A few high-end security doors in the market can give an alarm immediately when the inspected person passes through the security door and the metal carried by the person exceeds the preset parameter value according to the weight, quantity or shape, and display the position of the metal causing the alarm, so that the security personnel can find the metal items carried by the person in time.
Extended data:
Radiation problems of emergency doors:
Any electronic product has certain electromagnetic radiation. There is also a lot of electromagnetic radiation around us. For example, radio stations, TV stations, cell phone towers, high-voltage lines, computers, televisions, microwave ovens, induction cookers, mobile phones and so on.
Compared with these electronic products, the electromagnetic radiation of the security door is very small, because the security door is a weak magnetic field induction technology, and its power is very small, which is many times smaller than that of mobile phone calls! Less radiation than a computer monitor. So the electromagnetic radiation of the security gate is safe.
References:
Baidu encyclopedia-security door