Other systems make use of infrared light to detect heat changes. A single infrared sensor mounted in the corner of a room near the ceiling usually will be able to monitor the entire room. An infrared sensor works by detecting the heat produced by the human body. When someone enters the room, there will be a change in the heat signature and this will trigger the sensor. Since infrared sensors are sensitive towards heat, it will cause a lot of problem when used outdoor or in room with a lot of sunlight. To avoid false alarms, just be sure to locate it well away from objects that rapidly change temperature, such as furnace vents, wood stoves, and sun-heated windows. If those objects are unavoidable, the LX-802N motion detector offers sunlight immunity sensors. If you have pets that are free to run around the house, choose a “pet-immune” model such as the K980-Visonic Pet Immune Infrared sensor.

Some motion detection systems use photoelectric beams. This type of sensors involves a light-sensitive cell and a directed light source such as a laser. The laser is a light beam shot directly towards the cell on the other side of the room, doorway or passageway. The source transmits invisible light beams to the adjacent cell or sensor. Often an infrared filter covers the light source to make it non-visible to intruders. When a person move across the photoelectric connection, the light beam’s continuous transmission is broken and trips the alarm. Mirrors can be installed with photoelectric security systems in order to allow one light beam to be projected across a large area, thus allowing a criss-crossing of the light beam across a room. This makes it much more difficult for an intruder to crawl under, or step over the light beam.

Other motion detecting systems detect vibration. Many car alarms have this feature to alert the owner that something has bumped into his automobile or someone has broken into it.

Some sensors such as the EagleEye Motion Sensor can be coupled with a transceiver to add additional functionality to the security system. The signals received from the transceiver can be passed along into the house’s wiring and used to turn on lamp or appliance. It offers personal security such as lighting up dark area when you moved into that area.

A motion sensor can also be installed on the exterior of the house such as the driveway and when coupled with floodlights, an area can be illuminated when motion is detected. This kind of combination is very useful in drawing attention to the intruders and to scare them off. A sensor that is able to alert the owner of movement within the compound with spoken alert signal such as the the BS-KIT – MURS ALERT SYSTEM, offers early detection warning to the homeowner. This model is especially useful for large application such as a ranch as it offers the ability to monitor activity at remote location.

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