Abstract
The aim of our work is to quantify two gases (acetone and ethanol) diluted in an air buffer using only a single metal oxide (MOX) sensor. We took advantage of the low selectivity of the MOX sensor, exploiting a dual-temperature mode. Working at two temperatures of the MOX sensitive layer allowed us to obtain diversity in the measures. Two virtual sensors were created to characterize our gas mixture. We presented a linear-quadratic mixture sensing model which was closer to the experimental data. To validate this model and the experimental protocol, we inverted the system of quadratic equations to quantify a mixture of the two gases. The linear-quadratic model was compared to the bilinear model proposed in the literature. We presented an experimental evaluation on mixtures made of a few ppm of acetone and ethanol, and we obtained a precision close to the ppm. This is an important step towards medical applications, particularly in terms of diabetes, to deliver a non-invasive measure with a low-cost device.
Highlights
Gas sensors, especially metal oxide (MOX) gas sensors, are increasingly used in electronic noses to detect volatile organic compounds (VOCs) [1,2]
Especially metal oxide (MOX) gas sensors, are increasingly used in electronic noses to detect volatile organic compounds (VOCs) [1,2]. This is of particular relevance to medical applications because VOCs are abundant in breath [3,4]; several VOCs are biomarkers of disease [5,6,7] because their concentrations are different for healthy and ill persons
To have enough diversity for quantification, we proposed to modify the temperature of the MOX sensitive layer, thanks to a heater located under the sensitive layer
Summary
Especially metal oxide (MOX) gas sensors, are increasingly used in electronic noses to detect volatile organic compounds (VOCs) [1,2]. This is of particular relevance to medical applications because VOCs are abundant in breath [3,4]; several VOCs are biomarkers of disease [5,6,7] because their concentrations are different for healthy and ill persons. Estimating the concentration of acetone without blood sampling but with a portable breath analyzer would be a great advance for diabetics Diabetics usually have an acetone rate between 2 and 7 ppm [8,9,10], sometimes reaching 21 ppm [11] whereas healthy people have less than 1 ppm in their breath [4,6,12].
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