Electrostatic multipole for electrical resistivity measurements at the decimetric scale

Souffaché, B.; Cosenza, Philippe; Flageul, Sébastien; Pencolé, J.-P.; Seladji, Samir; Tabbagh, Alain

doi:10.1016/j.jappgeo.2010.01.009

Cited by 16 publications

(9 citation statements)

References 13 publications

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“…For various test materials, good agreement was observed between measurements using the multipole and those using galvanic contact resistivity measurements, in which the electrode array accurately reproduced the pole geometry (Souffaché et al . ).…”

Section: Methods and Instrumentmentioning

confidence: 97%

First Investigations of In Situ Electrical Properties of Limestone Blocks of Ancient Monuments

et al. 2015

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In situ rapid electrostatic investigations on calcareous stones of monuments provide information that strongly correlates with the geological characteristics of the stone and proves to be efficient for provenance identification and successive restoration. With a portable device, it is now possible to scan several thousand blocks on a face of a monument in a few hours. The evolution of the religious building construction practices between the 13th and the 17th centuries is studied. From the petrophysics point of view, the results clearly indicate a marked linear correlation between electrical conductivity and dielectric permittivity. This fact, which agrees with Maxwell-Wagner polarization modelling, confirms the part played by the clay content in the electric properties of the dry carbonate rocks constituting the monument stones. A first test using X-ray scattering analysis shows the part played by the relative content of illite, which is correlated with a decrease of the resistivity.

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Section: Methods and Instrumentmentioning

confidence: 97%

First Investigations of In Situ Electrical Properties of Limestone Blocks of Ancient Monuments

et al. 2015

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“…3b, a part of the peninsula Tromsøya with the city Tromsø and the lake is visible. Lake Prestvannet covers an area of about 10 ha, has a maximum depth of 4 m and is covered by ice most of the year (Stabbel, 1985). Although no quantitative statement is made, investigations of the lake water qualitatively indicate a high salinity (https://memim.com/ prestvannet.html, last access: 29 August 2019).…”

Section: Tromsømentioning

confidence: 99%

Two-dimensional inversion of wideband spectral data from the capacitively coupled resistivity method – first applications in periglacial environments

et al. 2019

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Abstract. The DC resistivity method is a common tool in periglacial research because it can delineate zones of large resistivities, which are often associated with frozen water. The interpretation can be ambiguous, however, because large resistivities may also have other causes, like solid dry rock. One possibility to reduce the ambiguity is to measure the frequency-dependent resistivity. At low frequencies (< 100 Hz) the corresponding method is called induced polarization, which has also been used in periglacial environments. For the detection and possibly quantification of water ice, a higher frequency range, between 100 Hz and 100 kHz, may be particularly interesting because in that range, the electrical properties of water ice exhibit a characteristic behaviour. In addition, the large frequencies allow a capacitive coupling of the electrodes, which may have logistical advantages. The capacitively coupled resistivity (CCR) method tries to combine these logistical advantages with the potential scientific benefit of reduced ambiguity. In this paper, we discuss CCR data obtained at two field sites with cryospheric influence: the Schilthorn massif in the Swiss Alps and the frozen Lake Prestvannet in the northern part of Norway. One objective is to add examples to the literature where the method is assessed in different conditions. Our results agree reasonably well with known subsurface structure: at the Prestvannet site, the transition from a frozen lake to the land is clearly visible in the inversion results, whereas at the Schilthorn site, the boundary between a snow cover and the bedrock below can be nicely delineated. In both cases, the electrical parameters are consistent with those expected from literature. The second objective is to discuss useful methodological advancements: first, we investigate the effect of capacitive sensor height above the surface and corroborate the assumption that it is negligible for highly resistive conditions. For the inversion of the data, we modified an existing 2-D inversion code originally developed for low-frequency induced polarization data by including a parametrization of electrical permittivity. The new inversion code allows the extraction of electrical parameters that may be directly compared with literature values, which was previously not possible.

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“…A CC resistivity system works by injecting an alternating current (AC) into the ground and measuring the potential of the ground capacitively without galvanic coupling (Grard and Tabbagh, 1991;Timofeev et al, 1994;Kuras et al, 2006). Compared with the conventional direct current (DC) resistivity method, the CC resistivity method is more suitable for use in permafrost, mountains, and urban areas where setting up the electrodes is challenging (Tabbagh et al, 1993;Hauck and Kneisel, 2006;Perez-Gracia et al, 2009;Souffache et al, 2010). In addition, because there is no need to install the steel electrodes, the CC resistivity measurement is less time consuming than the traditional DC resistivity measurement.…”

Section: Introductionmentioning

confidence: 99%

Inversion of capacitively coupled resistivity (line-antenna) measurements

Niu

Wang

2014

GEOPHYSICS

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The capacitively coupled resistivity method using line antennas (or electrodes) has been widely applied for various kinds of applications. To solve the associated inversion problem, the general practice (i.e., the indirect inversion method) for 2D surface resistivity surveys is to approximate the line-electrode array by an equivalent point-electrode array, so that the existing direct current resistivity inversion programs can still be used. Based on the experimental evidence from this study that two resistivity arrays with a similar sensitivity (1D) curve offers comparable measurement, we optimized the equivalent point-electrode array by minimizing the sensitivity (1D) difference between the lineand point-electrode arrays in terms of the depth of investigation difference (DID). The dipole length of the optimal equivalent point-electrode array can be determined by considering only the array with the shortest dipole distance. For the line-electrode arrays with the dipole lengths of 2.5, 5, and 10 m, the suggested optimal dipole lengths are 74%, 73%, and 73% of the respective dipole lengths. The numerical examples carried out in this study prove the effectiveness of the indirect inversion method for 2D surface resistivity surveys when the appropriate equivalent point-electrode array with a low DID value is chosen, and vice versa. The direct inversion of the line electrode resistivity measurements from 3D resistivity surveys is achieved with a MAT-LAB-based, open-source resistivity inversion package called RESINVM3D incorporating line electrodes. The usefulness of this modified code was demonstrated with a numerical example that considered cross-borehole resistivity tomography using line electrode measurements. The location of the assigned resistivity anomaly and the boundary between two soil layers were well captured by the direction inversion.

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Electrostatic multipole for electrical resistivity measurements at the decimetric scale

Cited by 16 publications

References 13 publications

First Investigations of In Situ Electrical Properties of Limestone Blocks of Ancient Monuments

First Investigations of In Situ Electrical Properties of Limestone Blocks of Ancient Monuments

Two-dimensional inversion of wideband spectral data from the capacitively coupled resistivity method – first applications in periglacial environments

Inversion of capacitively coupled resistivity (line-antenna) measurements

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