Complex Permittivity Frequency Variations From Multioffset GPR Data: Hydraulic Concrete Characterization

Ihamouten, Amine; Villain, Géraldine; Dérobert, Xavier

doi:10.1109/tim.2012.2190330

Cited by 30 publications

(18 citation statements)

References 29 publications

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“…Recent researches [8,15,17,21] demonstrated the dependence of the complex permittivity to the water and chloride contents in concrete ( Fig. 1) with a discrimination between the two effects according to the frequency bandwidth and the nature of the observable (real or imaginary part of the permittivity).…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, several techniques have been developed, with varying degrees of success, in order to describe the frequency dependence of the dielectric permittivity of geological and civil engineering materials [8][9][10][11][12][13][14][15][16][17]. This frequency dependence of complex permittivity has introduced the notion of material dispersion [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Determination of concrete water content by coupling electromagnetic methods: Coaxial/cylindrical transition line with capacitive probes

Villain

Ihamouten²,

Dérobert

2017

NDT & E International

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This paper deals with the development and the validation of an innovative, easy-to-use and on site technique for determination of concrete water content. The on-site technique is the capacitive probe, able to characterize in situ dielectric media in the 30-35 MHz frequency band (around 33 MHz). For the evaluation of water content in various civil engineering structures, a calibration methodology has to be developed and is presented herein. It is based on the complex permittivity estimation of various dispersive concretes, which is carried out by a cylindrical coaxial electromagnetic (EM) transition line allowing the characterization in laboratory of material samples in a large GPR frequency bandwidth [50-600 MHz]. This methodology consists then on a coupling between the results of both the capacitive probes and the coaxial EM cell extrapolated at low frequency (33 MHz). The extrapolation procedure used to link physically the results of the two techniques is provided by the 4p-variant of Jonscher's model which is parameterized to obtain dispersion curves of the complex permittivity for very wide frequency bands. The methodology is checked by a parametric study that associates the 4p variant of Jonscher's model with the physical and hydric characteristics of the six concrete mix designs representing high performance and ordinary concretes at various hydric states. The surface testing results measured by capacitive probes on slabs are successfully compared to the extrapolated results obtained on cores.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of concrete water content by coupling electromagnetic methods: Coaxial/cylindrical transition line with capacitive probes

Villain

Ihamouten²,

Dérobert

2017

NDT & E International

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“…The values measured for the complex permittivity of the first sample of concrete from 0.7 to 1.1 GHz have been frequencyextended applying the fitted Debye model in (12), having an in-band accuracy below 0.1% for both real and imaginary part. Table III, and they can eventually be extended to other frequencies.…”

Section: A Debye Frequency-extended Permittivity Of Concretementioning

confidence: 99%

Debye Frequency-Extended Waveguide Permittivity Extraction for High Complex Permittivity Materials: Concrete Setting Process Characterization

González-López

Blanch

Romeu

et al. 2020

IEEE Trans. Instrum. Meas.

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A waveguide with central frequency 868 MHz is used in transmission/reflection operation regime to accurately measure the behaviour of the complex permittivity of high complex permittivity granular materials and it has been frequencyextended up to 3 GHz using the Debye fitted relaxation model. It is shown that for highly granular high permittivity materials a waveguide based transmission/reflection technique is necessary to reduce the uncertainty of the extracted permittivity values. The technique is first described and validated with isopropyl alcohol and then applied to the characterization of cement based materials. This paper provides accurate data on the evolution of the complex permittivity of concrete and mortar from the moment of pouring until air dried condition is achieved.

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“…We also validate our strategy for multiparameter inversion on targets involving both a purely dielectric cylinder and a purely metallic copper tube, although the optimization cannot recover the exact conductivity of copper. position of the material (Deeds and Bradford 2002;Ihamouten et al 2012) or of its water content (Garambois et al 2002;Huisman et al 2003;Day-Lewis et al 2005;Weihermüller et al 2007).Recently, Lavoué et al (2013Lavoué et al ( , 2014 proposed an imaging method based on the full waveform inversion (FWI) of GPR data for the reconstruction of permittivity and conductivity in 2D sections of the subsurface. FWI is a state-of-the-art quantitative imaging process that aims to exploit the whole information from the radargrams.…”

mentioning

confidence: 99%

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confidence: 99%

Frequency‐domain modelling and inversion of electromagnetic data for 2D permittivity and conductivity imaging: An application to the Institut Fresnel experimental dataset

Lavoué

Brossier

Métivier

et al. 2014

Near Surface Geophysics

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The need for quantitative imaging of the near subsurface leads to the development of inversion algorithms to infer ground properties from recorded data. The aim of this study is to validate an inversion method recently developed for the simultaneous imaging of dielectric permittivity and electrical conductivity from 2D ground-penetrating radar measurements. The validation is performed using electromagnetic data collected in a well-controlled laboratory environment. In this experiment, the knowledge of the targets enables a quality control of the inversion results. In addition, the free space environment and the measurement of the incident field simplify the choice of a starting model for the inversion, as well as the calibration of the data with respect to the source signature and to the geometrical spread. To perform accurate and efficient forward simulations, we use a frequency-domain finite-difference scheme whose stencil coefficients can be optimized for each simulated frequency. As the objects of interest are locally concentrated at the centre of the acquisition array, it is possible to restrict the computation domain to a small region enclosing the targets using an integral representation of the analytical incident field coming from the sources and of the scattered field that we analytically propagate towards the receivers. An analysis of the numerical errors done on synthetic data shows that this strategy provides an error level that is low enough not to perturb the inversion, while dramatically decreasing the computational cost compared to a full-domain simulation. The monoparameter reconstruction of a purely dielectric target recovers permittivity values in very good agreement with the expected ones, as well as a very satisfying data fit. We also validate our strategy for multiparameter inversion on targets involving both a purely dielectric cylinder and a purely metallic copper tube, although the optimization cannot recover the exact conductivity of copper.

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Complex Permittivity Frequency Variations From Multioffset GPR Data: Hydraulic Concrete Characterization

Cited by 30 publications

References 29 publications

Determination of concrete water content by coupling electromagnetic methods: Coaxial/cylindrical transition line with capacitive probes

Determination of concrete water content by coupling electromagnetic methods: Coaxial/cylindrical transition line with capacitive probes

Debye Frequency-Extended Waveguide Permittivity Extraction for High Complex Permittivity Materials: Concrete Setting Process Characterization

Frequency‐domain modelling and inversion of electromagnetic data for 2D permittivity and conductivity imaging: An application to the Institut Fresnel experimental dataset

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