Importance

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Abstract

Embodiments of a passive infrared detector can distinguish between an intruder and a small animal passing nearby the detector with a high degree of accuracy without substantially detracting from the ability to detect the intruder within a coverage area farther from the detector. In some embodiments, the passive infrared detector includes a pair of lens assemblies that collect infrared light onto corresponding infrared sensors. Each lens assembly receives light from different spatial regions, which do not overlap near the detector and which substantially overlap farther from the detector. The passive infrared detector also includes a controller that is capable of distinguishing between an intruder and a small animal based on simultaneity of signals from the infrared sensors or by summing the signals from the infrared sensors.

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First Claim