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Abstract

An improved passive infrared balanced detector is disclosed that reduces false alarm rates induced from random thermal activity and other causes of splitting of the field(s) of view of the balanced detector into distinct and independent regions. The detector includes balanced elements selectively shaped and arranged to provide common mode rejection within each of the regions into which the field(s) of view are subject to being split. The unbalance susceptibility of the novel detectors may be adapted to the particular requirements of the intended applications environment. The susceptibility for unbalance is materially reduced and therewith the alarm confidence level of the detectors is substantially improved.

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