How Infrared Security Works | eHow.com
Read whole article at: http://www.ehow.com/how-does_5911843_infrared-security-works.html
An infrared security system works with an infrared light beam detector that serves as an access control/entry detection of a door or window, proving the threshold crossing alert as needed. When the infrared beam is broken by a person or object in its path, it will be detected by the system. The system also works with infrared security cameras, glass breaking sensors and shrill and silent alarms.
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