Alarm systems based on passive infrared detectors capture an intruder who has already entered the roomA system based on infrared barriers is designed to trigger an alarm when an intruder is just about to enter the rooms and is still outside the facility
The curtain consists of several active infrared barriers (tracks), which create invisible \"bars\" in the window or door recess An attempt to violate this \"lattice\" causes immediate activation of alarm signaling
Infrared curtains are also used to secure controlled passages, gates, fences, valuable objects in open space, etc. In museums, infrared curtains successfully fulfill the role of a conflict-free, discreet separation of the viewer from valuable exhibits