IR barriers

IR barrier

— sensors that respond to the crossing of the protected perimeter. Such a sensor generates a beam (or several beams) in the infrared range, and when such a beam is crossed by a foreign object, the device gives a signal. Most often, the IR barrier consists of a separately made receiver and transmitter, however, there are also one-sided devices in which the emitter itself “monitors” the reflection of the beam from a certain object.

Recall that IR rays are invisible to the naked eye; this makes it possible to effectively disguise such a system. And the range of modern IR barriers can reach several hundred metres.