How Passive Infrared Motion Detection Works
Passive infrared motion detection operates by using sensors that detect infrared radiation naturally emitted by objects in their environment. These sensors are typically composed of a pyroelectric sensor that can detect changes in infrared radiation levels. When an object, such as a person, moves within the sensor's field of view, it causes a change in the infrared radiation pattern. The sensor detects this change and sends a signal to the digital signage system, triggering a pre-programmed response. This response could be anything from displaying a specific advertisement to adjusting the brightness of the screen. The technology is termed "passive" because it does not emit any radiation itself; it merely detects the infrared energy emitted by other objects. This makes it energy-efficient and suitable for various applications where active emission of signals is not desirable.