One of the most sophisticated types of alarm system is the infrared alarm system. This system can detect the motion of infrared producing sources, which are usually human or animal bodies. Although all things emit some infrared radiation, things that are at a relatively higher temperature (such as living things, or fires) are the more significant sources of infrared radiation. Infrared radiation can be “seen” (detected) using especially designed electronic devices.
In an infrared alarm system, these infrared detecting devices are placed strategically in inconspicuous places in a room or hallway. These devices send out infrared beams throughout the space they are placed in. These beams are sent out in layers, with the uppermost layer having a straight range of about sixty feet and a sideways range of about thirty-five feet. The center layer of infrared beams goes through the middle of the space, while the lowermost layer sweeps the area near the detector.
These beams can be used by the devices to calculate and determine the infrared temperature of the area that the beams land on. If there is a sudden change of temperature, the system would then analyze this change to determine if it is enough to trigger the alarm. For example, if a person walks too close to a painting or other valuable object protected by an infrared alarm system, the alarm would be triggered due to the person’s body heat and infrared signature.
Infrared alarm systems do not trigger the alarm if the room warms up or cools down slowly. These sophisticated systems have a built-in microchip which can be programmed to allow the infrared alarm system to adjust itself for slow and regular temperature variations. This means that weather or climate related shifts in temperature would not trigger the infrared alarm system.
There are also “Pet Immune Motion Sensors” nowadays. These are infrared alarm systems that can be configured to memorize the infrared signature of your pet or pets. This means that they won’t trigger the alarm, even if your pet roams around the house.
The major setback with this kind of alarm system is its cost. More than one infrared device would be needed to entirely protect a house. For one thing, these sensors cannot work through walls or other obstacles: they only sense the first object or surface that their beams land on. So, a lot of infrared sensors would be needed to protect the whole house, typically one infrared device in every room of the house. These sensors would work best placed on the ceiling, so as to have a full range of three hundred sixty degrees looking down on the room.
A well-designed infrared system can indeed be a costly installation, but it would provide a very high level of security for a house or establishment.
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