What’s dual-tech PIR detector?
Dual-tech PIR detector is a motion sensor that combines two different technologies, typically Passive Infrared (PIR) and Microwave detection, to improve accuracy and reduce false alarms.
How it works:
1. Passive Infrared (PIR) Sensor: Detects motion by sensing changes in infrared radiation (heat) emitted by objects, particularly humans or animals. When a warm body moves across the sensor’s detection area, it causes a change in the infrared levels, triggering the sensor.
2. Microwave Sensor: Emitting microwave signals and detecting the reflection (using the Doppler effect), it identifies movement by analyzing changes in the frequency of reflected microwaves when an object moves.
How Dual-Tech Works:
– Both the PIR sensor and microwave sensor operate together, but the system only triggers an alarm when **both** sensors detect motion. This “dual confirmation” system ensures higher accuracy.
For example, if the PIR sensor detects motion but the microwave sensor does not, or vice versa, the detector won’t trigger an alert. This significantly reduces the risk of false alarms caused by non-human heat sources (like sunlight or HVAC systems) or microwave interference (like moving tree branches or small animals).
Advantages of Dual-Tech PIR Detectors:
– Reduced false alarms: By requiring two different types of detection to confirm motion, dual-tech sensors are much less likely to be fooled by environmental factors.
– More reliable in challenging environments: They work well in spaces with temperature fluctuations, or areas prone to external movement (e.g., wind, drafts).
– Increased security: The combination of technologies ensures better motion detection, making these detectors highly reliable for security systems.
Common applications include security systems for homes, offices, and commercial buildings, where a balance between sensitivity and reliability is needed.
