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Conception et réalisation de méthodes de détection de polluants gazeux atmosphériques à l'aide d'un nez électronique portable

Abstract : The malodorous atmospheric pollution results essentially from four gases SO2, H2S, No2 and NH3. To reduce at best these fatal effects on the health and the environment, it is necessary to control continuously the gas emanations closer to the source, That requires adevice enable to detect these polluant gases, easy to use, with reduced size and weight. In this way, we have realized a portable electronic nose, to detect of the four target gases already mentioned. The sensitive part of this prototype is composed of a matrix of six semi conducting metal oxide sensors, offering a good cross sensivity. The electronic nose mimics the human nose, he has to learn to recognize an odour. This learning phase is realised in the laboratoy by introducing in the sensor cell gas mixtures with controlled composition, The sensor response varies with the nature of the gas (reducing or oxidizing) and their own gas sensitivity. The use of analysis and data methods proves that our electronic nose can well discriminate a complex gas mixture and quantify it. Then, we have placed the electronic nose in a real situation, by studying the odour coming from a duck experimental farm. The obtained results showed that this prototype could well detect the variations of the odour level in accordance with the influent parameters. So, we have realized the laboratory and the real site validation of our electronic nose. But the metal oxide sensors present an inconvenient : they have to keep continuously their working temperature (~ 350°C). To prevent this strong energy consumption, we have developed polymer sensors which work at room temperature. The characterization in laboratory showed that they are sensitive to studied target gases. Their responses to H2S have a good stability in short and middle term, allowing to integrate them into the matrix after complete development
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Submitted on : Thursday, March 29, 2018 - 1:52:28 PM
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Sophie Fuchs. Conception et réalisation de méthodes de détection de polluants gazeux atmosphériques à l'aide d'un nez électronique portable. Autre. Université Paul Verlaine - Metz, 2008. Français. ⟨NNT : 2008METZ046S⟩. ⟨tel-01752610⟩



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