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Home Security Motion Detectors A few decades back, if you told someone that you’re inventing an electronic device that could detect if something around him was moving, you would either be labeled as a hopeless optimist at best or your subject would have been transformed into a best selling science fiction book. Today however, these devices exist and they are generically named motion detectors, although there are different types of devices using different technologies. Home security benefits a great deal from this technology and although it’s not yet a perfected field, it’s probably what all future home security systems will be using. As I stated earlier, there are 4 types of motion detectors: infrared based motion detectors (also known as passive infrared sensors or PIR sensors), ultrasonic based motion detectors, microwave based motion detectors and the last type contains all combinations of the first three types. Added security for your home with these motion activated floodlights Passive infrared sensors set up an infrared spectrum around the device and any change in this spectrum is marked as motion detection. However, modern passive infrared sensors are tuned in such a way that a simple falling branch won’t trigger them, as it will take something heavier and with body heat in order for the motion detector to signal the alarm. Yes, infrared motion detectors also watch out for body heat, so the only false alarm you could get is if your pet is walking around the infrared spectrum’s area in the middle of the night. Ultrasonic motion detectors are the least popular of the three main types. The device sends out repeating ultrasonic pulses that measure the reflection of any object they find moving. In a clear environment, they will be perform equally well to infrared or microwave based motion detectors. However, in a real home setting there are a lot of factors that can interfere with the motion detector’s ultrasonic pulses, hence making them a bit unreliable. Microwave motion detectors work exactly as a police radar gun does. They fire constant microwaves in the air, which bounce of the objects that are found in their path. This creates an “image” of the surrounding area and any motion can easily be detected. Although more reliable than ultrasonic motion detectors, microwave motion detectors have the disadvantage that they can be easily triggered by random moving objects and the false alarms tend to get annoying after a while (especially to your neighbors!).  Last but not least, the fourth category includes the so called “dual technology motion detectors”. These motion detectors use a combination of 2 of the above mentioned detection methods in order to create a more reliable device that triggers as few false alarms as possible. One of the most common combinations found in dual technology motion detectors is the infrared/microwave. These detectors combine the reliable microwave motion detection with the infrared’s heat sensors, which heavily cut down the number of false alarms that are triggered. Added security for your home with these motion activated floodlights Modern infrared/microwave motion detectors even have pet-immune functions which allow the device to ignore pet movement. Wireless models can detect and ignore pets of up to 40 pounds, whereas hard-wired models can detect and ignore pets that are twice as large.