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2 Opto-Electronics Review

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Maximisation of signal-to-noise ratio in infrared radiation receivers

100%

Bielecki Z.

2002

tom Vol. 10, No. 3

209-216

The paper describes principles minimisation of noise produced in infrared detection systems. Analysis of operating conditions affecting signal to noise ratio (S/N) has been carried out. Also analyses for maximisation of S/N in advanced methods of optical signals detection have been made. Many practical solutions have confirmed theoretical predictions.

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.