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.
Highlights
Robotic systems have been of interest in many fields, such as manufacturing [1], medical health care [2], military [3], agriculture [4], and in emergency response [5]
fast Fourier transform (FFT) results were presented every 2 s correlates to the 2 s two gases: acetone and ethanol
The results presented above demonstrate the working mechanism of this novel temperature The results presented above demonstrate the working mechanism of this novel temperature modulation technique in real-time applications, which is vital for mobile robot application
Summary
Robotic systems have been of interest in many fields, such as manufacturing [1], medical health care [2], military [3], agriculture [4], and in emergency response [5] They are ideal tools for exploring hazardous areas without placing the lives of emergency responders (e.g., firefighters) at risk. The robot requires sensors other than machine vision to navigate, such as LIDAR and RADAR [6], in order to generate real-time maps and images with detailed information. Such equipment is vital for fire and rescue teams. A multi-sensor unit is required, in areas with possible gas contaminations or unknown gas substances, for gas discrimination, localization, mappings and comprehensive environmental monitoring
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