Real-Time Thermal Modulation of High Bandwidth MOX Gas Sensors for Mobile Robot Applications†
AbstractA 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
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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.
Xing Y, Vincent TA, Cole M, Gardner JW. Real-Time Thermal Modulation of High Bandwidth MOX Gas Sensors for Mobile Robot Applications. Sensors. 2019; 19(5):1180.Chicago/Turabian Style
Xing, Yuxin; Vincent, Timothy A.; Cole, Marina; Gardner, Julian W. 2019. "Real-Time Thermal Modulation of High Bandwidth MOX Gas Sensors for Mobile Robot Applications." Sensors 19, no. 5: 1180.
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