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


TYPES

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 (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 of an object. Similar to a police radar gun.''



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 Alarm s are reduced. All companies have the option to use PIR/Microwave Motion Detectors that have "Pet-Immune" fuctions which allow the detector to ignore pets that weigh up to 40 pounds (wireless models) or 80 pounds (hard-wired models).


SEE ALSO

Infrared Motion Detector