Next Article in Journal
SynSys: A Synthetic Data Generation System for Healthcare Applications
Next Article in Special Issue
Screen-Printed Sensors for Colorimetric Detection of Hydrogen Sulfide in Ambient Air
Previous Article in Journal
Change Detection in SAR Images Based on the ROF Model Semi-Implicit Denoising Method
Previous Article in Special Issue
Design and Manufacturing of a Disposable, Cyclo-Olefin Copolymer, Microfluidic Device for a Biosensor
Article Menu
Issue 5 (March-1) cover image

Export Article

Open AccessArticle
Sensors 2019, 19(5), 1180;

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

School of Engineering, University of Warwick, Coventry CV4 7AL, UK
Authors to whom correspondence should be addressed.
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)
PDF [3986 KB, uploaded 8 March 2019]


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

Figure 1

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).

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top