Microwave-Sensor Array for Decoupling Detection of Distance, Shape, Dielectric, and Morphology

Wu, Jia-Kang; Yue, Wei; Gao, Ke; von Gratowski, Svetlana; Gu, Xiao-Feng; Pan, Lijia; Kim, Nam-Young; Liang, Jun-Ge

doi:10.1109/tim.2023.3300411

IEEE Trans. Instrum. Meas.

2023

DOI: 10.1109/tim.2023.3300411

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Microwave-Sensor Array for Decoupling Detection of Distance, Shape, Dielectric, and Morphology

Jia-Kang Wu,

Wei Yue,

Ke Gao

et al.

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2024

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Cited by 1 publication

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Operation Temperature Effects on a Microwave Gas Sensor with and without Sensitive Material

Wu,

Kim

et al. 2024

ACS Sens.

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Microwave gas sensors have garnered attention for their high sensitivity and selectivity in the detection of volatile organic compounds (VOCs). However, traditional gas sensors generally rely on sensitive materials that degrade over time and are easily affected by the environment, compromising their stability and accuracy. This study proposes a microwave VOC gas sensor based on the condensation effect. The sensor adopts a novel design without sensitive materials, utilizing the condensation effect to detect acetone gas. The sensor system consists of a microwave sensor and a temperature control device. As the sensor temperature is lowered below the boiling point of acetone, the condensation of acetone gas on the sensor surface is achieved, enabling accurate detection of acetone gas. Experimental results indicate that the accumulated amount of acetone on the sensor surface is positively correlated with its response, with the maximum response of 3000 ppm acetone gas reaching 0.34 dB. Additionally, this study investigated the detection mechanism of the sensor after adding the sensitive material MXene and compared the performance of the sensor at different temperatures (−10 °C, 0 °C, and 60 °C). The results show that at −10 °C the sensor mainly captures acetone through physical adsorption, while at 25 and 60 °C, it primarily responds through chemical adsorption, with a maximum response of 0.29 dB. The VOC sensor based on the condensation effect without sensitive materials not only achieves the same sensitivity as traditional microwave sensors but also demonstrates stronger stability and anti-interference capabilities.

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Operation Temperature Effects on a Microwave Gas Sensor with and without Sensitive Material

Wu,

Kim

et al. 2024

ACS Sens.

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show abstract

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Microwave-Sensor Array for Decoupling Detection of Distance, Shape, Dielectric, and Morphology

Cited by 1 publication

References 42 publications

Operation Temperature Effects on a Microwave Gas Sensor with and without Sensitive Material

Operation Temperature Effects on a Microwave Gas Sensor with and without Sensitive Material

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