A comparison of phase-shift and one-port coaxial cell permittivity measurements for GPR applications

Muller, Wayne and Derobert, Xavier (2013). A comparison of phase-shift and one-port coaxial cell permittivity measurements for GPR applications. In: IWAGPR 2013 - Proceedings of the 2013 7th International Workshop on Advanced Ground Penetrating Radar. 7th International Workshop on Advanced Ground Penetrating Radar, IWAGPR 2013, Nantes, France, (). 2 - 5 July 2013. doi:10.1109/IWAGPR.2013.6601526

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Author Muller, Wayne
Derobert, Xavier
Title of paper A comparison of phase-shift and one-port coaxial cell permittivity measurements for GPR applications
Conference name 7th International Workshop on Advanced Ground Penetrating Radar, IWAGPR 2013
Conference location Nantes, France
Conference dates 2 - 5 July 2013
Proceedings title IWAGPR 2013 - Proceedings of the 2013 7th International Workshop on Advanced Ground Penetrating Radar
Journal name IWAGPR 2013 - Proceedings of the 2013 7th International Workshop on Advanced Ground Penetrating Radar
Place of Publication Piscataway, NJ United States
Publisher I E E E
Publication Year 2013
Year available 2013
Sub-type Fully published paper
DOI 10.1109/IWAGPR.2013.6601526
ISBN 9781479909377
Total pages 6
Collection year 2014
Language eng
Abstract/Summary The coarse and loose nature of unbound granular road materials presents a number of challenges for conventional permittivity characterisation approaches. An alternative that appears better suited to these materials involves measuring the phase-shift at discrete frequencies through a sample of known thickness. To validate this approach against more established methods, a comparison is required on materials that can be easily measured using either method. To this end phase-shift measurements were undertaken on a range of solid dielectric slabs including various types of stone, plastic and an artificial material. Permittivity predictions from this method were then compared to results from a one-port coaxial cell. As an additional comparison, and to better understand the results, the phase-shift test setup was also modelled using GPRMax software. To improve the predictions, reverberations within the test apparatus were minimized by isolating the direct wave using time-domain Blackman windowing. However, the narrow window necessary for this particular test setup also degraded the ability to detect frequency-dependent permittivity changes. Overall the phase-shift approach produced real relative permittivity predictions similar to that from the one-port coaxial cell. Despite limitations in the current approach, the results validate the phase-shift approach as a simple and rapid method of characterizing the permittivity of larger dielectric material samples of constant thickness.
Subjects 1705 Computer Networks and Communications
Keyword Coaxial cell
Dielectric characterisation
Ground penetrating radar
Permittivity characterisation
Phase shift
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2014 Collection
 
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Created: Fri, 29 Nov 2013, 06:22:36 EST by System User on behalf of School of Civil Engineering