Modelling the behaviour of an open-ended coaxial probe to assess the permittivity of heterogeneous dielectrics solids

Guihard, Vincent; Taillade, Frédéric; Balayssac, Jean-Paul; Steck, B.; Sanahuja, Julien; Deby, Fabrice

doi:10.1109/piers.2017.8262014

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…In previous works, modelling of the probe proved its ability to characterize the permittivity of flat media over the frequency range [100 MHz; 1 GHz] [25]. Using such probe and capacitive model also requires a specific calibration procedure detailed in [4].…”

Section: Measurement Of Permittivitymentioning

confidence: 99%

See 1 more Smart Citation

Effective medium theories in electromagnetism for the prediction of water content in cement pastes

Guihard

Patapy

Sanahuja³

et al. 2020

International Journal of Engineering Science

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Section: Measurement Of Permittivitymentioning

confidence: 99%

“…It can be acquired, either from embedded sensors (Time Domain Reflectometry [2]) or from the surface using a hand-held probe (capacitive probes [3], coaxial probes [4], Ground Penetrating Radar [5]).…”

Section: Introductionmentioning

confidence: 99%

Effective medium theories in electromagnetism for the prediction of water content in cement pastes

Guihard

Patapy

Sanahuja³

et al. 2020

International Journal of Engineering Science

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“…The present study extends our understanding of how even micron-scale heterogeneities can influence the measured permittivity. In particular, the spatial relationship of the heterogeneities to the probe is an important aspect that is not captured by, for example, treating the material as a uniformly heterogeneous mixture [ 20 ]. In future studies, it may be important to use imaging or other detection techniques to assess tissue heterogeneities concurrently with permittivity measurement [ 15 ].…”

Section: Discussionmentioning

confidence: 99%

An Analysis of Open-Ended Coaxial Probe Sensitivity to Heterogeneous Media

Brace

Etoz

2020

Sensors

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Open-ended coaxial probe spectroscopy is commonly used to determine the dielectric permittivity of biological tissues. However, heterogeneities in the probe sensing region can limit measurement precision and reproducibility. This study presents an analysis of the coaxial probe sensing region to elucidate the effects of heterogeneities on measured permittivity. Coaxial probe spectroscopy at 0.5–20 GHz was numerically simulated while a homogenous background was perturbed with a small inclusion of contrasting permittivity. Shifts in the measured effective permittivity provided a three-dimensional assessment of the probe sensitivity field. Sensitivity was well-approximated by the square of the electric field for each analyzed probe. Smaller probes were more sensitive to heterogeneities throughout their sensing region, but were less sensitive to spectral effects compared to larger probes. The probe sensing diameter was less than 0.5 mm in all directions by multiple metrics. Therefore, small heterogeneities may substantially impact permittivity measurement in biological tissues if located near the probe-tissue interface.

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“…The VNA also enables a reflection coefficient to be acquired, which is associated with the sample and can be related to its dielectric permittivity thanks to a capacitive model [18]. This model offers immediate permittivity estimation, but has a limited frequency range [21]. Using such a probe and capacitive model also requires a specific calibration procedure detailed in [22].…”

Section: Description Of the Open-ended Coaxial Probementioning

confidence: 99%

Study of the dielectric gradient values of reinforced concrete sample by considering radar measurements in an inverse problem

Ferrières

Klysz

Guihard

et al. 2020

Inverse Problems in Science and Engineering

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The goal of this study is to develop a tool that will evaluate the moisture content gradient in the depth of reinforced concretes in the context of building safety. The monitoring of ageing phenomena, such as the corrosion of steel reinforcements, depends on the amount of water and on its gradient as they are directly related to the dielectric values of the concrete. In this paper, to obtain these values, we propose to solve an inverse problem for reinforced concrete. First, an experimental device based on radar measurements is proposed with its 3D numerical model. Next, we describe an inverse process, to determine a dielectric profile according to the depth and validate it on measured data obtained for control samples.

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Modelling the behaviour of an open-ended coaxial probe to assess the permittivity of heterogeneous dielectrics solids

Cited by 7 publications

References 12 publications

Effective medium theories in electromagnetism for the prediction of water content in cement pastes

Effective medium theories in electromagnetism for the prediction of water content in cement pastes

An Analysis of Open-Ended Coaxial Probe Sensitivity to Heterogeneous Media

Study of the dielectric gradient values of reinforced concrete sample by considering radar measurements in an inverse problem

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