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Add 1:Floor 4,Xuming Science Park,1193 Guanguang Road,Guihua Community,
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NO.26-38 KWAI CHEONG ROAD,N.T,HONG KONG
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Infrared alarm principle and the choose and purchase2014-11-7
Infrared alarm principle and the choose and purchase
Nowadays more and more people pay more attention on family security. Today, the security market not only for government, enterprise, project security engineering, merchants also begin to pay close attention to civil security.Shenzhen now wireless alarm screen computer company in the top of the industry
Principle of the infrared alarm(pir sensor),
Principle of the infrared alarm(pir sensor),
Infrared alarm system mainly adopts thermal infrared technology to monitor the designated area.When have uninvited invasion, regional heat change immediately, detector detects a change that will send out alarm and automatic dialing alarm to his master.!
Infrared wide Angle probe area is the starting point, the lens in the prevention of level 110 degrees, 90 degrees vertically, 9 meters long conical detection area, in this area, as long as it is heat animal activities in the territory, the infrared heat energy will be absorbed.
Mainly by the host, detector and remote controller of three parts.Detector for detecting the temperature change, the host is responsible for the dial and alert can also live recording, remote control will be decided by master issue instructions protection, removal.:
It is wireless monitor, do not need to wiring.According to the instruction manual for installation, the host connected to the telephone line, connection between a host and detector, can be used for power supply is connected.
Because the height of pet is limited, can adjust the Angle of the probe, set aside the pet activity detection area.
Two type infrared alarm analysis of choose and buy
Passive infrared alarm is mainly based on the change of the external infrared energy to determine whether someone is moving.Human body infrared energy and the environment have differences, when people by detecting area, alarm collected from the different position of infrared energy changes, and then through the analysis report to the police.
But the environment is not only the body emit infrared energy, many of the objects under certain conditions can emit infrared energy, and this energy is particularly prominent in the visible light, so any passive infrared alarm of white light interference has become an important indicator.Recommended enterprise practical passive alarm indoors, because indoor light stability, infrared energy is constant, this kind of environment detection effect is very good.Enterprise in selecting infrared alarm when should choose according to the environmental characteristics of oneself, so as to make the infrared anti-theft system play a biggest role.
Compared with the passive infrared alarm system, active infrared system commonly used in perimeter prevention, when choosing active infrared alarm, also need to pay attention to the following questions:
1, active infrared intrusion alarm affected by fog, outdoor use shall choose which has the function of automatic gain device (the device when the climate changes will automatically adjust the sensitivity);In addition, the detection range for the selected device alert actual distance to set aside more than 20% of the surplus, in order to reduce the false alarm caused climate change system.Foggy area, filthy environment outdoor sand blown region unfavorable use active infrared intrusion sensors.
2, when used in outdoor must choose double beam or 3 active infrared intrusion alarm light beam, to reduce the system false alarm by animals, leaves, etc.
3, on the walls, roof, or open field using active infrared intrusion alarm, should choose to have the function of lightning protection devices.In case of broken walls, and distance and relatively close, can choose reflection device, to reduce the use quantity alarm.
4, pay attention to household appliances electromagnetic interference