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Inversion of Coaxial Transmission Line Measurements for Determining Soil Dielectric PropertiesNormal access

Authors: K. Takahashi, S. Schennen, J. Igel, M. Ono and C. Konishi
Event name: 81st EAGE Conference and Exhibition 2019
Session: Poster: Near Surface - Mining and Technologies
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201900755
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.22Mb )
Price: € 20

Summary:
Soils can be characterised by measuring and analysing dielectric properties. The coaxial transmission line measurement is the cost common technique to measure complex permittivity in a wide frequency range. Authors developed a new method for inverting measured data and retrieving complex permittivity. The method numerically models the measurement setup by finite difference time domain (FDTD) method and updates the model to minimise the error between the modelling and measurements. The developed method was tested with standard materials: air, water and ethanol, and showed that it does not have issues of the conventional method, which is based on the analytical solution. Further, complex permittivity of sand was measured and inverted by the developed method. The results show the clear difference depending on various water contents.


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