Contribution au développement d'un système multiplicateurs de gaz : application à la détection de gaz réfrigérant Forane 134a et de gaz carbonique dans une atmosphère conditionnée humide

Abstract : The development of gas multisensor systems (electronic noses) has now an increasing interest in many field of application. In the field of atmospheric anti-pollution control our study consists in the main detection of a refrigerant gas Forane 134a and carbon dioxide in a humidity controlled atmosphere. We first give the state of the art on electronic noses and gas sensors, and then we present to justify our choice for array of tin dioxide (SnO2) sensors from FIGARO Engineering Inc. We mention the main constraints for their use allowing us to define the experimental set-up useful to their study. We show the importance of this set-up by noting the errors and other lack of precision which can be induced in the measurements if a good control is not correctly operated. Afterwards, we give the characterization results of the chosen sensor types for the different possible atmospheres : dry or wet synthetic air mixed with various concentrations of our two target gases R134 and CO2 and their mixture. We underline the reducing type response of the sensor in presence of humidity or R134a, and the oxidising type response CO2. We also show the influence of the relative humidity on the alone or mixed studied gases. From this characterization two main representative variables are extracted : the steady-state conductance and the conductance dynamic slope. The system learning data base is then built and we show that the association of the reference gas conductance as a variable with the two other types allow us to reduce the drift effects during the treatment with multivariate data analysis methods (Principal Component Analysis and Discriminant Factorial Analysis). Finally we propose decisive laws for the identification of the target gases and also their possible quantification. These laws allowed us the successful identification (more than 99%) of unknown test cases
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Claude Delpha. Contribution au développement d'un système multiplicateurs de gaz : application à la détection de gaz réfrigérant Forane 134a et de gaz carbonique dans une atmosphère conditionnée humide. Electronique. Université Paul Verlaine - Metz, 2000. Français. ⟨NNT : 2000METZ031S⟩. ⟨tel-01775385⟩

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