Security gate is a common security detection equipment, which is widely used in public places such as airports, subway stations, and shopping malls. It ensures safety by detecting metal objects on the surface of the human body, however, for the special case of smoke, the security gate is not fully suitable.
Security gates are mainly used to detect metal objects, and the working principle is based on the interference of metal objects with electromagnetic fields. When passing through a security gate, a metal object causes a specific signal response that can be recognized by the gate. However, smoke is a substance made up of organic matter and has no metallic composition to cause significant interference with electromagnetic fields, so the presence of smoke cannot be detected by the security gate.
Although the security gate cannot directly detect smoke, in some special cases, such as detecting the packaging of cigarettes, some brands of cigarette boxes have metal substances on the surface, and a layer of metal aluminum foil inside the box to prevent cigarettes from getting wet.
To sum up, the answer to the question of whether the security gate can detect smoke is not certain. While the presence of smoke cannot be directly detected at the security gate, in exceptional cases, the gate may indirectly detect smoke, triggering an alarm to draw the attention of the security personnel and proceed with manual inspection.