Application of thermistor effect intelligent ozone sensors

Tadeusz Habdank-Wojewodzki; Tadeusz Pisarkiewicz; Przemyslaw Potempa; Seweryn Habdank-Wojewodzki

doi:10.1117/12.346853

30 April 1999 Application of thermistor effect intelligent ozone sensors

Tadeusz Habdank-Wojewodzki, Tadeusz Pisarkiewicz, Przemyslaw Potempa, Seweryn Habdank-Wojewodzki

Proceedings Volume 3730, Optoelectronic and Electronic Sensors III; (1999) https://doi.org/10.1117/12.346853
Event: Optoelectronic and Electronic Sensors III, 1998, Jurata, Poland

Abstract

When constructing ozone sensor one should consider dynamics of circuit inputs and of circuit itself. That dynamics is related to heat capacity conductivity of sensors substrate and case. Physical parameters are described as an implicit functions but we can use simplified model to resolve input space. During measurement stochastic parameters like humidity, medium temperature, medium flow velocity should be observed, due to their influence on heat conductivity and convection. When PID controller with two state output was used to stabilize temperature, regardless of constant input parameters at system output appeared binary noise. That phenomenon is related to temperature sensitivity of semiconductor layer which is higher than sensitivity of PID controller. That sensitivity causes amplification of controller output signal changes. Solution of that problem are physical models based estimators.

Citation Download Citation

Tadeusz Habdank-Wojewodzki, Tadeusz Pisarkiewicz, Przemyslaw Potempa, and Seweryn Habdank-Wojewodzki "Application of thermistor effect intelligent ozone sensors", Proc. SPIE 3730, Optoelectronic and Electronic Sensors III, (30 April 1999); https://doi.org/10.1117/12.346853

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KEYWORDS

Sensors

Ozone

Resistance

Fuzzy logic

Humidity

Intelligent sensors

Convection

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