Which aspect of PIR technology enhances its sensitivity?

The aspect of Passive Infrared (PIR) technology that enhances its sensitivity is focusing on a defined field of view. By concentrating on a specific area, PIR sensors can become more adept at detecting minute changes in infrared radiation, which is emitted by living beings and objects that generate heat.

This targeted approach allows the sensor to effectively filter out background noise and irrelevant infrared emissions, leading to more accurate detection of movement and presence. A defined field of view is critical because it ensures that the sensor is only responsive to what is important within that focused area, improving the likelihood of detecting a true positive when a person or animal enters the defined zone.

This focus does not mean the sensor is less effective in general; rather, it optimizes performance by honing in on relevant stimuli. Other factors, such as the size of the sensors, signal processing, and the inclusion of additional sensors, play roles in overall detection capabilities, but they do not directly enhance sensitivity in the same fundamental way that defining a specific field of view does.