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Electronics 2018, 7(4), 54; https://doi.org/10.3390/electronics7040054

Response Optimization of a Chemical Gas Sensor Array using Temperature Modulation

Multisensor System and Pattern Recognition Research Group (GISM), Electronic Engineering Program, Universidad de Pamplona, Km 1 Vía Bucaramanga, Pamplona 543050, Colombia
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Received: 13 March 2018 / Revised: 17 April 2018 / Accepted: 17 April 2018 / Published: 21 April 2018
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Abstract

This paper consists of the design and implementation of a simple conditioning circuit to optimize the electronic nose performance, where a temperature modulation method was applied to the heating resistor to study the sensor’s response and confirm whether they are able to make the discrimination when exposed to different volatile organic compounds (VOC’s). This study was based on determining the efficiency of the gas sensors with the aim to perform an electronic nose, improving the sensitivity, selectivity and repeatability of the measuring system, selecting the type of modulation (e.g., pulse width modulation) for the analytes detection (i.e., Moscatel wine samples (2% of alcohol) and ethyl alcohol (70%)). The results demonstrated that by using temperature modulation technique to the heating resistors, it is possible to realize the discrimination of VOC’s in fast and easy way through a chemical sensors array. Therefore, a discrimination model based on principal component analysis (PCA) was implemented to each sensor, with data responses obtaining a variance of 94.5% and accuracy of 100%. View Full-Text
Keywords: temperature modulation; gas sensors; volatile organic compounds; electronic nose; conditioning circuit temperature modulation; gas sensors; volatile organic compounds; electronic nose; conditioning circuit
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Durán, C.; Benjumea, J.; Carrillo, J. Response Optimization of a Chemical Gas Sensor Array using Temperature Modulation. Electronics 2018, 7, 54.

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