Optimising a modified free-space permittivity characterisation method for civil engineering applications

Muller, Wayne and Scheuermann, Alexander (2016) Optimising a modified free-space permittivity characterisation method for civil engineering applications. Journal of Geophysics and Engineering, 13 2: S9-S18. doi:10.1088/1742-2132/13/2/S9


Author Muller, Wayne
Scheuermann, Alexander
Title Optimising a modified free-space permittivity characterisation method for civil engineering applications
Journal name Journal of Geophysics and Engineering   Check publisher's open access policy
ISSN 1742-2140
1742-2132
Publication date 2016-03-30
Year available 2016
Sub-type Article (original research)
DOI 10.1088/1742-2132/13/2/S9
Open Access Status Not Open Access
Volume 13
Issue 2
Start page S9
End page S18
Total pages 10
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Collection year 2017
Language eng
Formatted abstract
Measuring the electrical permittivity of civil engineering materials is important for a range of ground penetrating radar (GPR) and pavement moisture measurement applications. Compacted unbound granular (UBG) pavement materials present a number of preparation and measurement challenges using conventional characterisation techniques. As an alternative to these methods, a modified free-space (MFS) characterisation approach has previously been investigated. This paper describes recent work to optimise and validate the MFS technique. The research included finite difference time domain (FDTD) modelling to better understand the nature of wave propagation within material samples and the test apparatus. This research led to improvements in the test approach and optimisation of sample sizes. The influence of antenna spacing and sample thickness on the permittivity results was investigated by a series of experiments separating antennas and measuring samples of nylon and water. Permittivity measurements of samples of nylon and water approximately 100 mm and 170 mm thick were also compared, showing consistent results. These measurements also agreed well with surface probe measurements of the nylon sample and literature values for water. The results indicate permittivity estimates of acceptable accuracy can be obtained using the proposed approach, apparatus and sample sizes.
Keyword GPR
Permittivity characterization
Unbound granular road pavements
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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