The conversation between human and AI assistant.
Sensors: Why does infrared appear purple in digital cameras?
That's interesting. Can you explain how a motion detector that uses infrared works?
Certainly. Infrared motion detectors work by detecting changes in the amount of infrared radiation that is emitted or reflected by objects in their field of view. When a person or animal moves across the detector's field of view, their body heat radiates infrared energy that is detected by the sensor. This triggers an alarm, or turns on a light, or does some other action, depending on what the detector is connected to.