The conductance in air of thick-film gas sensors operating via flow trough tecnique strongly depends on the flux. In this work we demonstrate that the major effect of the flow rate is a change in humidity, because the thermal effect on the sensor is negligible. A mathematical model based on heat exchange and direct measurements of the resistance of the heater confirms this hypothesis and humidity compensation gave very good results.
Dependence of response of SnO2 based thick film gas sensors on humidity
GIBERTI, Alessio;CAROTTA, Maria Cristina;GUIDI, Vincenzo;MALAGU', Cesare;
2008
Abstract
The conductance in air of thick-film gas sensors operating via flow trough tecnique strongly depends on the flux. In this work we demonstrate that the major effect of the flow rate is a change in humidity, because the thermal effect on the sensor is negligible. A mathematical model based on heat exchange and direct measurements of the resistance of the heater confirms this hypothesis and humidity compensation gave very good results.File in questo prodotto:
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