Passive infrared detection system with three-element, single- channel, pyroelectric detector

摘要

A passive infrared detection system embodies a new three- element, single-channel, pyroelectric detector. For a given amount of motion by a target in a region under surveillance, the detector provides more complex signature information than conventional two-element detectors, thereby allowing the target to be more readily distinguished from spurious environmental or background sources. Owing to the geometry of the detector electrodes, the false-alarming effects produced by spurious stimuli common to all detector elements are reduced. The detector is particularly adapted for use in infrared detection systems of the type which use pulse-counting techniques to distinguish targets of interest from non-targets.