Mr. Rahul Rawat Profile

Rahul Rawat

at Univ of South Florida

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Proceedings Article | 28 September 2023 Presentation + Paper

Application of machine learning models for data interpretation from an array of gas sensors

Kat-Kim Phan, Matthew Southworth, Varun Teja Kolluru, Rahul Rawat, Arash Takshi, Ehsan Sheybani

Proceedings Volume 12661, 1266102 (2023) https://doi.org/10.1117/12.2677893

KEYWORDS: Sensors, Data modeling, Gas sensors, Principal component analysis, Machine learning, Gases, Detector arrays, Bioalcohols, Education and training, Nose

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With the increasing demand in using electronic noses (e-noses) for various medical, industrial, and military applications, the technology of such devices is still struggling with the limitations in the gas sensors. Particularly, a limitation is in the relatively poor sensitivity and selectivity of the commercially available sensors for measuring the concentrations of various gases and volatile organic compounds (VOCs). The shortcoming has been addressed by employing machine learning (ML) methods to analyze signals from an array of gas sensors. However, with different ML models, it is required to study the effect of different models on data interpretation. In this study, we have designed a microcontroller-based system equipped with eight different gas/VOC sensors, designed for detecting CO₂, O₂, CO, NO, NO₂, NH₃, alcohol, and acetone. The sensors were tested with streams of air mixed with various VOCs including methanol, ethanol, and isopropanol at different flow rates. The collected data from the sensors were analyzed using PCA, LDA, and CNN methods for not only recognizing the signatures of different gases, but also differentiating between them and recognizing their ratio in a mixture. The results of the studies are promising for designing more effective hardware equipped with an ML modeling system to analyze the concentration of various gases and VOCs in a mixed situation.

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