A motion dectector is a device that detects moving objects, particularly people, they form a vital component of security.
There are several types of motion detectors:
-Passive infrared (PIR): They detect person's skin temperature through emitted black body radiation at mid-infrared wavelengths in contrast to the surrounding objects.
-Microwave: Similar to radar speed gun (an emission of a continuous wave of microwave radiation).
-Ultrasonic: An ultrasonic wave (sound at a frequency higher than a human can hear) is emitted and reflections from nearby objects are received.
-Tomographic motion detector:They sense disturbances to radio waves as they pass from node to node of a mesh network.
-Video camera software: Digital cameras.
- What sound detectors are?
The sound detector is a small board that combines a microphone and some processing circuitry
The use is as an alarm system, for example: if someone is trying to break into your house and break a window or something else, a sound detector will sense the sound coming from the breaking glass and set off an alarm.
No comments:
Post a Comment