Adaptation d'un nez électronique pour le contrôle de la concentration et de l'humidité d'une atmosphère chargée en huile essentielle destinée à un effet thérapeutique médical

Abstract : Recent clinical studies have demonstrated the stimulating or relaxing effects of odorous stimulation on subjects suffering from neuro-sensoriel deficiencies. These studies concern generally the variation measurement of physiological parameters or psychological indicators in relation with odorous stimuli. To evaluate quantitatively the odorous effects of natural oil stimulations on the subject behavior or his cognitive performance, it is necessary to control automatically and accurately the quantity of the active substances present in the air inhaled by the patient. The aim of this work is to conceive a gas ?diffuser/detector? system to generate fixed concentration of an essential oil in an experimental chamber atmosphere. Diffusion unit is based on the control of the air flow arte bubbling through the liquid oil (pin, lavender, orange), and the range of the employed concentration range is determined after physic-chemical and sensorial analysis. The detection of volatilized substances is obtained using a matrix of commercial metal oxide gas sensors. The study of the sensor responses to different pin oil concentrations showed, after an adequate digital filtering, a good cross sensitivity of the sensors. So, we have extracted from each sensor response, several characteristic parameters, firstly classical ones, and then new ones representing the dynamic phase of the signal response, to create the learning data base. The analysis of these data using pattern recognition methods (non-supervised and then supervised) permitted us to highlight a set of parameters for a reliable and rapid identification of closed diffused oil concentrations. The application of the system with the two other oils was decisive: we can now carry out the realization of a prototype for the therapeutic tests
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Herizo Sambemana. Adaptation d'un nez électronique pour le contrôle de la concentration et de l'humidité d'une atmosphère chargée en huile essentielle destinée à un effet thérapeutique médical. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0054⟩. ⟨tel-01749225⟩

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