First in situ tests of a new electrostatic resistivity meter

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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“…; Flageul et al . ), inside monuments (Dabas et al . ; Dabas and Titus ) or for permafrost studies (Hauck and Kneisel ; De Pascale et al .…”

Section: Methods and Instrumentmentioning

confidence: 99%

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

et al. 2015

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“…Eburovices (now Evreux in Normandy) (Guyard and Lepert 1999). Several new surveying techniques and different devices (Flageul et al 2013) have already been tested in this area, such that a series of control data was available. The soil resistivity was mapped using a three- In each pair, the first receiver is horizontal, allowing HCP measurements to be made.…”

Section: Gallo-roman Site Of Vieil-evreux (Eure France)mentioning

confidence: 99%

Interpretation of shallow electromagnetic instruments resistivity and magnetic susceptibility measurements using rapid 1D/3D inversion

Benech

Dabas²,

Simon

et al. 2016

GEOPHYSICS

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“…The CCR method was originally suggested for applications on space missions (Grard, 1990;Grard and Tabbagh, 1991), where the conditions (large resistivities, difficult electrode coupling) may be similar to those in periglacial environments. In addition to application in space (Seidensticker et al, 2007), devices have been developed for investigations in urban areas such as facades (Souffaché et al, 2010) or roads (Dashevsky et al, 2005;Flageul et al, 2013), as well as archeological sites (Tabbagh et al, 1993) and environmental problems (Kuras et al, 2007).…”

Section: Introductionmentioning

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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First in situ tests of a new electrostatic resistivity meter

Cited by 15 publications

References 19 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

Interpretation of shallow electromagnetic instruments resistivity and magnetic susceptibility measurements using rapid 1D/3D inversion

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

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