Motion detector is a device which detects moving object inside a certain area.
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| Motion Sensor |
Classification:
There are mainly two types of motion sensor:
>> Active motion sensor
>> Passive motion sensor
Active motion sensor have both a transmitter and a receiver. This type of sensor detects motion by measuring changes in the amount of sound or radiation reflecting back into the receiver. The most common type of active motion detector uses ultrasonic sensor technology. These motion sensors emit sound waves to detect the presence of object. There are also microwave sensors which emit microwave radiation and tomographic sensors work by radio waves.
Passive motion sensor does not have any transmitter, It detects motion based on a perceived increase of radiation in its environment. The most commonly used type of passive motion sensor in home security system is the Passive Infrared (PIR) sensor. The PIR sensor is designed to detect the infrared radiation emitted naturally from the human body.
1. Passive Infrared(PIR)
2. Microwave
3. Ultrasonic
4. Tomographic Motion Detector
