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Uncooled IR focal plane arrays

100%

Kruse P. W.

1999

tom Vol. 7, No. 4

253-258

Uncooled IR focal plane arrays employ thermal detection mechanisms including the resistive bolometric, pyroelectric, and thermoelectric effects. Readout electronics are incorporated at each pixel. Two thermal isolation structures are possible : hybrid and monolithic. The ultimate limit to the performance is set by temperature fluctuation noise, which depends upon the structure. The state-of-the-art of the approaches employing the three mechanisms is reviewed.

Method of popcorn-noise reduction

100%

Bielecki Z. , Brudnowski M.

2003

tom Vol. 11, No. 1

45-50

A new type of passive infrared human body detecting photoreceiver with popcorn noise reduction systems is presented. When the range of operating temperatures and temperature gradients of a pyroelectric detector are spread, the popcorn noise occurs. To avoid error signal at the system output we designed two-signal processing circuits. We observed a difference of frequency components at the photoreceiver output. The output current resulting from popcorn noise holds high frequency components compared with frequency components of a moving person. So, we can distinguish popcorn noise analysing frequency components of the output current from the pyroelectric detector.