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Alarm System ⇒Passive IR-sensors
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Пассивные ИК-датчики

Optoelectronic infraredpassive detectors are widely used in different purposes, of premises locked, as the third line of defence in the systems of protection of objects by using technical means of signaling.

The tactic of using detectors based on features of their devices and the principle of work.

The main structural elements of the detector are:
  • the optical system of collective
  • lenses (or Fresnel mirrors)with a common focus, which formssensitivity located sectorfan made (the number of elements in the system) distributed in the field (background) infrared radiation from walls, floors, radiators and other items in the room;
  • pir-element, sensitive to infrared thermal radiation band that is placed in the focus of the optical system;
  • electronic circuit processingadapted signal to backgroundthe level of infrared radiationindoors. When crossing(input, output) at least one of thethe sensitivity of the optical sectorbody systems, infraredthe above background radiation,It is a sharp increase in(especially on the border invasion)the amplitude of the infrared flux (splash). This signal is perceived by the pir-element is handled by the electronic circuit and executive members, after which a signal of "anxiety".




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