Enhancing Electrical Contact with a Commercial Polymer for Electrical Resistivity Tomography on Archaeological Sites A Case Study

Vásconez-Maza, Marco D; Martínez‐Pagán, Pedro; Aktarakçi, Hasan; García-Nieto, María C; Martínez-Segura, Marcos A

doi:10.37247/pams2ed.3.2021.5

Cited by 2 publications

(1 citation statement)

References 21 publications

(27 reference statements)

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“…Typically, this problem can be solved by adding salt water in the immediate vicinity of the electrodes (Binley, 2015) or by installing extra electrodes in parallel to the main ones (Hauck et al ., 2008). Recently, during ERT measurements for archaeological surveys, a carbomer‐based gel has been tested with success to improve the electrical contact between ground and electrodes (Vásconez‐Maza et al ., 2020). This commercial product, portable and easy‐to‐find, is a standard electrical enhancer for magnetic resonance imaging employed in medical diagnostic.…”

Section: Introductionmentioning

confidence: 99%

Improving the galvanic contact resistance for geoelectrical measurements in debris areas: A case study

Pavoni

Carrera

Boaga

2022

Near Surface Geophysics

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This paper aims to test, in a quantitative way, the different approaches that can be applied to improve the contact resistance problem in a debris environment for the acquisition of electrical resistivity tomography. We collected various datasets on the same investigation line in a blocky ground surface of a landslide deposit, using different coupling systems: single electrodes placed between the boulders, adding extra electrodes in parallel and drilled single electrodes inside the blocks. We performed the measurements in natural dry conditions, then we added salt water nearby the electrodes hammered among the boulders and we filled the drilled holes with a conductive carbomer‐based gel. The results clearly demonstrate that using salt water significantly reduces the contact resistances, but also that, if salt water is not available, we can collect a good quality dataset in dry conditions by connecting more electrodes in parallel. Drilling the electrodes directly inside the boulders decreases the data quality but, if necessary, we demonstrate that the use of a commercial carbon polymer gel can provide a marked improvement in contact resistances.

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Section: Introductionmentioning

confidence: 99%

Improving the galvanic contact resistance for geoelectrical measurements in debris areas: A case study

Pavoni

Carrera

Boaga

2022

Near Surface Geophysics

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A Geophysical Investigation in Which 3D Electrical Resistivity Tomography and Ground-Penetrating Radar Are Used to Determine Singularities in the Foundations of the Protected Historic Tower of Murcia Cathedral (Spain)

García-Nieto,

Martínez-Segura,

Navarro

et al. 2024

Remote Sensing

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This study presents a procedure in which 3D electrical resistivity tomography (ERT) and ground-penetrating radar (GPR) were used to determine singularities in the foundations of protected historic towers, where space is limited due to their characteristics and location in highly populated areas. This study was carried out on the Tower of the Cathedral “Santa Iglesia Catedral de Santa María” in Murcia, Spain. The novel distribution of a continuous nonlinear profile along the outer and inner perimeters of the Tower allowed us to obtain a 3D ERT model of the subsoil, even under its load-bearing walls. This nonlinear configuration of the electrodes allowed us to reach adequate investigation depths in buildings with limited interior and exterior space for data collection without disturbing the historic structure. The ERT results were compared with GPR measurements and with information from archaeological excavations conducted in 1999 and 2009. The geometry and distribution of the cavities in the entire foundation slab of the Tower were determined, verifying the proposed procedure. This methodology allows the acquisition of a detailed understanding of the singularities of the foundations of protected historic towers in urban areas with limited space, reducing time and costs and avoiding the use of destructive techniques, with the aim of implementing a more efficient and effective strategy for the protection of other tower foundations.

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Enhancing Electrical Contact with a Commercial Polymer for Electrical Resistivity Tomography on Archaeological Sites A Case Study

Cited by 2 publications

References 21 publications

Improving the galvanic contact resistance for geoelectrical measurements in debris areas: A case study

Improving the galvanic contact resistance for geoelectrical measurements in debris areas: A case study

A Geophysical Investigation in Which 3D Electrical Resistivity Tomography and Ground-Penetrating Radar Are Used to Determine Singularities in the Foundations of the Protected Historic Tower of Murcia Cathedral (Spain)

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