Motion sensors, such as those used in our product line, typically employ one of common technologies: Passive Infrared (PIR), Ultrasonic, Microwave or Dual-Technology.
Passive Infrared (PIR) sensors detect changes in heat radiation within the environment. When a warm body like a human or animal passes in the detection area, it detects the change in infrared radiation and triggers the sensor. This technology is energy-efficient as it does not emit energy but only receives it.
Ultrasonic sensors emit ultrasonic waves, and when these waves hit an object, they bounce back to the sensor. The sensor then measures the time it took for the wave to return, allowing it to calculate the distance to the object. If the object moves, the time it takes for the wave to return changes, triggering the sensor.
Microwave sensors work similarly to ultrasonic sensors but use microwave pulses instead of ultrasonic waves. These sensors cover a larger area compared to PIR and Ultrasonic sensors but are more prone to interference and false alarms.
In a dual-technology motion sensor, both the PIR and Ultrasonic sensors must be triggered to set off the light. This significantly reduces the chance of false alarms as both heat movement (from PIR) and physical movement (from Ultrasonic) need to be detected. This makes them ideal for situations where precision is paramount.
