[16a-A33-1~11] FS.1 Focused Session "AI Electronics"

10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)English Presentation

[16a-A33-6] [The 56th Young Scientist Presentation Award Speech] Study on correlation between GCMS mapping and QCM sensing signals for ternary gas mixtures.

〇Thanisorn Oonpitipongsa¹, Chaiyanut Jirayupat^1,2, Wataru Tanaka¹, Takuro Hosomi¹, Tsunaki Takahashi¹, Takeshi Yanagida^1,3 (1.Eng., The Univ. of Tokyo, 2.Mi-6 Ltd, 3.IMCE, Kyushu Univ.)

Keywords:

integration of sensors and AI,machine learning,GCMS

In the biomedical field, especially cancer prediction, researchers have identified multiple Volatile Organic Compounds (VOCs) as biomarkers for diseases using Gas Chromatography-Mass Spectrometry (GCMS), while gas sensor arrays are claimed to differentiate these diseases with notable accuracy. This highlights a key question in gas sensor applications: is there a link between gas sensing signals and GCMS analysis profiles? In this study, we introduce a novel method that establishes a strong correlation between GCMS mapping and sensor signals, a long-standing gap in gas analysis, with machine learning techniques. We applied this method to ternary gas mixtures of ethanol, toluene, and dichloromethane with QCM gas sensors covered with 4 types of metal oxides. Utilizing Convolutional Neural Networks (CNN) and Principal Component Analysis (PCA), we successfully predict GCMS mapping from gas sensors signal with a remarkable average R² = 0.98 in stratified cross-validation and average R² = 0.96 in leave-one-out cross-validation. Furthermore, we employed CAM (Class Activation Mapping) and feature extraction approach for feature importance visualization of sensor signals, providing insights into the interaction between various gas species and sensor materials. This advancement not only proves the capability of gas sensors in distinguishing between different gas mixtures but also paves the way for enhanced gas mixtures’ fingerprint studies in diverse applications such as disease diagnosis, environment management, industrial monitoring, and food and beverage quality determination.