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Multi-Frequency Loop Electromagnetic System Measurement on Shallow Offshore Archaeological Site of Oulos

François-Xavier Simon, Nikos Papadopoulos, Julien Guillemoteau, Dimitris Oikonomou et Kleanthis Simirdanis
p. 215-218

Résumé

– Multi-frequency loop electromagnetic system measurements can be done on shallow offshore sites.

– Multi-frequency sounding is relevant in this environment.

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Introduction

Electromagnetic induction (EMI) equipment with a multi-frequency harmonic source of the Slingram type and small coil spacing, was initially intended for multi-depth electrical conductivity mapping. This type of “vertical” multi-frequency EMI sounding implies that the operating frequencies significantly change the depth of investigation, which, in the case of the small loop loop Slingram systems, requires measurements at large induction numbers. In the frequency range used by these systems (300 Hz-90 kHz), this condition is rarely encountered because near-surface conductivity values are very often less than 0.5 S/m. For this environment, the depth of investigation is then essentially determined by the coil spacing and geometry rather than by the frequency of the transmitter. With this constraint, these devices have nevertheless proved to be interesting for multi-parameter approaches where in some contexts, dielectric permittivity and magnetic viscosity can be estimated (S...

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François-Xavier Simon, Nikos Papadopoulos, Julien Guillemoteau, Dimitris Oikonomou et Kleanthis Simirdanis, « Multi-Frequency Loop Electromagnetic System Measurement on Shallow Offshore Archaeological Site of Oulos »ArcheoSciences, 45-1 | 2021, 215-218.

Référence électronique

François-Xavier Simon, Nikos Papadopoulos, Julien Guillemoteau, Dimitris Oikonomou et Kleanthis Simirdanis, « Multi-Frequency Loop Electromagnetic System Measurement on Shallow Offshore Archaeological Site of Oulos »ArcheoSciences [En ligne], 45-1 | 2021, mis en ligne le 16 août 2021, consulté le 24 septembre 2021. URL : http://journals.openedition.org/archeosciences/9690 ; DOI : https://doi.org/10.4000/archeosciences.9690

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Auteurs

François-Xavier Simon

Inrap, Paris, France, Laboratoire Chrono-Environnement, UMR 6249, UBFC-CNRS, Besançon, France

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Nikos Papadopoulos

Lab of GeoSat ReSeArch, IMS FORTH, Rethymnon, Greece

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Julien Guillemoteau

Institut de Géosciences, University of Potsdam, Germany

Dimitris Oikonomou

Lab of GeoSat ReSeArch, IMS FORTH, Rethymnon, Greece

Kleanthis Simirdanis

Lab of GeoSat ReSeArch, IMS FORTH, Rethymnon, Greece

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Droits d’auteur

Article L.111-1 du Code de la propriété intellectuelle.

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