Développement d’un appareil de sondage électromagnétique aux fréquences intermédiaires (100 kHz – 10 MHz) pour la mesure de l’humidité dans les terrains superficiels

National audience; BRGM is currently developing a multi-frequency electromagnetic sounding system operating in the intermediate frequency range (100 kHz – 10 MHz). This development is carried out in collaboration with UMR Sisyphe, LPCE and INRA, in the framework of the “EMFI” PNRH project. The aim of the project is a) to show the technical viability of a slingram-type geophysical instrument in this new frequency range, b) to prove the capability of such an instrument for the simultaneous and high-resolution determination of the subsurface permittivity and resistivity ! , and c) to validate the interest of such measurements in hydrogeology for the estimation of the water content and water salinity of the near-surface layers.