Determination of gravimetric water content of porous media based on time domain reflectometry

Hongjun Chen; Linze Li; Hao Zhang; Junfeng Wu; Jiandong Hu; Wentao Wei; Xiaodong Li

doi:10.1117/12.2657210

18 October 2022 Determination of gravimetric water content of porous media based on time domain reflectometry

Hongjun Chen, Linze Li, Hao Zhang, Junfeng Wu, Jiandong Hu, Wentao Wei, Xiaodong Li

Proceedings Volume 12349, International Conference on Agri-Photonics and Smart Agricultural Sensing Technologies (ICASAST 2022); 1234909 (2022) https://doi.org/10.1117/12.2657210
Event: International Conference on Agri-Photonics and Smart Agricultural Sensing Technologies (ICASAST 2022), 2022, Zhengzhou, China

Abstract

Time domain reflectometry (TDR) has become the most commonly utilized method for calculating the water content of porous media due to its advantages of rapidity, safety, and non-destructiveness. Nonetheless, the dielectric constant of porous media with the same gravimetric water content varies considerably due to their different porosity, so the TDR method cannot be directly used to measure the gravimetric water content. Although the traditional thermo-gravimetric method has high measurement accuracy, sampling is cumbersome and measurement is time-consuming. Therefore, it is essential to develop an accurate and effective method to calculate the gravimetric water content of porous media. Based on the dielectric measurement results, a third-order polynomial fitting equation describing the relationship between volume water content and apparent dielectric constant of quartz sand is obtained by employing the least square method. Then a TDR method, which can eliminate the influence of gap through secondary compression, is proposed to calculate the gravimetric water content of porous media. The comparative experiment with the thermo-gravimetric method demonstrates that this method has high measurement accuracy, and provides an approach for predicting the gravimetric water content, bulk density, and porosity of porous media, which can be used in field and laboratory applications.

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Hongjun Chen, Linze Li, Hao Zhang, Junfeng Wu, Jiandong Hu, Wentao Wei, and Xiaodong Li "Determination of gravimetric water content of porous media based on time domain reflectometry", Proc. SPIE 12349, International Conference on Agri-Photonics and Smart Agricultural Sensing Technologies (ICASAST 2022), 1234909 (18 October 2022); https://doi.org/10.1117/12.2657210

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KEYWORDS

Quartz

Dielectrics

Waveguides

Calibration

Reflectometry

Glasses

Error analysis

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