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Encyclopedia > Motion detector

A Motion Detector is a device connected to a burglar alarm that is used to detect motion. If it detects motion and the burglar alarm is set, it sets off the alarm. Burglar (or intrusion), fire and safety alarms are found in electronic form today. ... Motion detection includes methods by which motion has be identified. ...

An Electronic Motion Detector is a device that transforms the detection of motion into an electric signal.


There are basically three types of motion detectors still in use today. The most common and reliable motion detector uses infrared technology. Technolgy used:

  • Passive infrared sensors (PIR)
    • Detects changes in the infrared spectrum. Looks for body heat.
  • Ultrasonic
    • Sends out an emitting ultrasonic pulses and measures the reflection of a moving object.
  • Microwave
    • Microwaves are bounced off an object. Similar to a police radar gun.

Passive InfraRed sensors (PIRs) are electronic devices which are used in some security alarm systems to detect motion of an infrared emitting source, usually a human body. ...

Dual-Technology Motion Detectors

A lot of modern motion detectors use a combination of different technologies. These dual-technology detectors benefit with each type of sensor, and false alarms are reduced. All companies have the option to use PIR/Microwave Motion Detectors that have "Pet-Immune" functions which allow the detector to ignore pets that weigh up to 40 pounds (wireless models) or 80 pounds (hard-wired models). A false alarm is the phony report of an emergency, causing unnecessary panic and/or bringing resources (such as fire engines) to a place where they are not needed. ...

See also



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