What is motion detector and motion detection?
A motion detector or motion sensor is a device that is used for detecting a movement in a certain range in front or around the detector. Usually it is used to detect motion of humans and is used for both safety and security purposes.
Motion detection is such a process, where a special sensor is used for detecting changes of different objects (mostly humans) in the sensors detection range that can either be an outdoor or an indoor area. The most basic motion detectors are able to detect movement of objects in an area from 2 – 5 meters (6.5 to 16 feet) up to 20 meters (70 feet) and more.
There are different types of motion detectors from infrared, optical to radio wave and others, and each of these types are used for specific occasions. For example, infrared sensors monitor changes in infrared wave or heat in the observable area and turns on a light, alarm or a security camera when changes in the infrared spectrum are detected. Detectors that use radio frequency detection sends out microwave signals to monitor a room and when an object walks in detection area the sensor detects changes in microwave field and signals the system that there is a moving object in the room. Video cameras can also be used for motion detection by algorithmically comparing images, when someone walks into the room the picture and pixels changes and special algorithm can detect these changes.
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