Home security systems generally feature three types of motion sensor systems. Such systems most commonly use infrared technology, though microwave and dual technology systems are also available. Each type has its pros and cons, though each also is an effective way to protect a home.
Infrared motion sensors are one of the cheapest and most reliable systems available. The sensors use the infrared light spectrum to measure the heat of objects that pass in front of them and then compares it to the surrounding objects, such as a wall. If the heat of the passing object is significantly higher than the objects behind it, the sensor will go off. Instead of covering a full room, infrared systems cover only scanned areas, although each sensor can be fitted with different lenses to cover greater distances.
Microwave motion sensor systems send out electromagnetic waves that bounce off an object and back to the sensor. The sensor then reads the frequency of the returning waves. If an object is moving, the sensor receives different microwaves than the ones it sent out, signifying movement and setting off the alarm. These types of systems cover a larger area than infrared sensors, they are capable of penetrating walls, and they are more reliable over longer distances. Despite this, they are the least popular option on the market because of their vulnerability to electrical interference and their cost.
Dual technology systems use a combination of infrared and microwaves to provide the most complete coverage available. Using both forms of technology allows dual motion sensor systems to reduce the occurrence of false alarms by combining the microwave technology’s coverage range and the infrared technology’s use of heat sensing. While not as common as infrared motion sensors, the dual technology system is rapidly gaining popularity among homeowners and businesses alike.
Infrared, microwave and dual technology systems all provide the same function, but each offers unique advantages and disadvantages. Each type of technology also provides several settings to allow the user to alter sensitivity in cases where a home or building has pets or a large amount of outside animals that may inadvertently set off the alarm. Proper installation of any of these systems will help a homeowner improve the security around his home.
