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Sensors 2019, 19(5), 1180; https://doi.org/10.3390/s19051180

Real-Time Thermal Modulation of High Bandwidth MOX Gas Sensors for Mobile Robot Applications

School of Engineering, University of Warwick, Coventry CV4 7AL, UK
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This paper is an extended version of the conference paper: Thermal Modulation of a High-Bandwidth Gas Sensor Array in Real-Time for Application on a Mobile Robot. In Proceedings of the EUROSENSORS 2018, Graz, Austria, 9–12 September 2018.
Received: 30 January 2019 / Revised: 25 February 2019 / Accepted: 5 March 2019 / Published: 8 March 2019
(This article belongs to the Special Issue Eurosensors 2018 Selected Papers)
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Abstract

A new signal processing technique has been developed for resistive metal oxide (MOX) gas sensors to enable high-bandwidth measurements and enhanced selectivity at PPM levels (<5 PPM VOCs). An embedded micro-heater is thermally pulsed from a temperature of 225 to 350 °C, which enables the chemical reaction kinetics of the sensing film to be extracted using a fast Fourier transform. Signal processing is performed in real-time using a low-cost microcontroller integrated into a sensor module. Three sensors, coated with SnO2, WO3 and NiO respectively, were operated and processed at the same time. This approach enables the removal of long-term baseline drift and is more resilient to changes in ambient temperature. It also greatly reduced the measurement time from ~10 s to 2 s or less. Bench-top experimental results are presented for 0 to 200 ppm of acetone, and 0 ppm to 500 ppm of ethanol. Our results demonstrate our sensor system can be used on a mobile robot for real-time gas sensing. View Full-Text
Keywords: MOX; mobile robot; thermal modulation; high-bandwidth; interactive mapping MOX; mobile robot; thermal modulation; high-bandwidth; interactive mapping
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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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Xing, Y.; Vincent, T.A.; Cole, M.; Gardner, J.W. Real-Time Thermal Modulation of High Bandwidth MOX Gas Sensors for Mobile Robot Applications. Sensors 2019, 19, 1180.

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