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Dual detectors


Method that allows to eliminate problems with which passive infrared detectors meet is using dual detectors. Using two independent detection circuits that use two different methods of area control allows to eliminate problem of false alarms. Alarm is set only when both circuits signal alarm. In every other case, detector doesn't generate alarm. Both technologies verify one another rising detectors efficiency - specially when immunity for false alarms is taken under consideration. In most popular dual detectors except passive infrared technology is used microwave technology as second detecting circuit.

Motion detection in protected area for microwave circuit is being made with usage of Doppler's effect for electromagnetic waves. Main advantage and supremacy of dual detectors over passive infrared detectors is greater sensitivity and better protection against false alarms.
Dual detectors combine high quality detection conditions of PIR detectors Dual detectors are characterized by both the very good detection abilities of PIR sensors in the direction perpendicular to the detection beam axis and very good detection abilities of the microwave sensors along the axis of the emitted radiation.

Same as with PIR detectors, dual detectors have some flaws. Main flaw results from nature of high frequency electromagnetic waves interaction with matter. Electromagnetic waves of frequencies around 1Ghz used in alarm technologies have high permeability, hence problem of proper range calibration occurs. It may happen that detection rays reach outside protected area. In some detectors i.e.: Detection Systems detectors have implemented compensation functions that mineralize permeability problem.

Same as with PIR detectors, dual detectors are exposed to variations of temperature distribution caused by natural causes. This issue is not so relevant as in case of PIR detectors, however it cannot be omitted. In case of external dual detectors problem with permeability is not important. However new problem arises - effect of outdoor conditions on electronic circuits performance. This class detectors are being build with thought of protecting electronic circuits from negative effects of humidity. Various hermetic housings are being used as well as laminates that protect circuits.



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Last modification date:  2019-06-19 , 5:04:57

Products, security systems, control panels, IP cameras, CCTV, Warsaw, monitoring, intercom, access control

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Volta Warsaw. Alarm and fire detection systems - CCTV, motion detectors, cameras, exit buttons and fire buttons, outdoor motion detectors, doorphones, monitoring, leakage detectors and alarm devices. Also sales via web.

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