A Noncontact Microwave Sensor Based on Cylindrical Resonator for Detecting Concentration of Liquid Solutions

This article presents a microwave sensor composed of a cylindrical cavity resonator and thin plastic liquid container for noncontactual detection of the liquid solution concentration. The resonant frequency is tuned to around 11 GHz, resulting in miniaturized dimensions and easy integration with a w...

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Bibliographic Details
Published in:IEEE sensors journal 2021-01, Vol.21 (2), p.1208-1214
Main Authors: Mao, Yun Jie, Zhang, Yun Jing, Chen, Zi Ruo, Tong, Mei Song
Format: Article
Language:English
Subjects:
cavity resonator
Cavity resonators
concentration detection
Containers
Frequency shift
Liquids
Microwave sensor
Microwave sensors
noncontactually
Permittivity
Probes
Resonant frequencies
Resonant frequency
Sensitivity
Sensors
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Summary:This article presents a microwave sensor composed of a cylindrical cavity resonator and thin plastic liquid container for noncontactual detection of the liquid solution concentration. The resonant frequency is tuned to around 11 GHz, resulting in miniaturized dimensions and easy integration with a wireless sensor system. The sensor is with a small volume of 21 cm 3 and sensitivity of 0.4 kHz/(mg/L). Simulated results show a good linear relationship between the concentration of the sample solution and resonant frequency shift with the high sensitivity, which is consistent with the experimental result. Compared with other designs, the sensor also has a simple structure, low cost and easy implementation to in-situ and in-vitro detection scenarios.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2020.3016290