What’s Active PIR Detector?
Active Infrared (AIR) sensor is a type of sensor that detects objects by emitting and receiving infrared light. Unlike Passive Infrared (PIR) sensors, which rely on detecting infrared radiation from objects, active infrared sensors send out their own infrared signals to perform detection.
How it works:
- Emitting Infrared Light: The sensor contains an infrared emitter that continuously emits an infrared beam, which is usually invisible to the human eye.
- Receiving Reflected Signal: The sensor also has a receiver that detects the infrared light reflected back from objects. When an object enters the path of the infrared beam, it either reflects or blocks the light.
- Signal Processing: The sensor analyzes changes in the intensity or path of the reflected infrared light. When it detects a disruption, it interprets this as the presence of an object and triggers a response, such as sounding an alarm or activating lights.
Applications of Active Infrared Sensors:
- Security systems, like perimeter detection or door access control
- Automatic doors
- Industrial automation systems
- Counting systems (e.g., counting people entering/exiting a room)
Advantages:
- The detection range is controllable and can be adjusted by changing the intensity of the emitted infrared beam.
- It can accurately detect the position of an object, especially in smaller or controlled areas.
- It works well in complete darkness since it relies on its own emitted infrared light.
Compared to passive infrared sensors, active infrared sensors are more proactive, making them better suited for applications where precise detection over a longer distance or in more controlled conditions is required
