On the use of time series to improve signal processing of electrical data

Deparis Jacques (1) , Gance Julien (2) , Orlando Leite (2)

1 BRGM - Bureau de Recherches Géologiques et Minières
2 IRIS Instruments

Electrical Resistivity Tomography (ERT) has become widely used for engineering and environmental applications in the last couple of decades due to (1) the simplification and automating of resistivity meters and (2) the new generation of inversion software. Although the initial domain of application remain relevant today, these techniques are increasingly used for deep investigation and shallow environmental/geotechnical applications. These new applications involve working with complex resistivity, which can be measured in the time domain (TDIP: Time Domain Induce Polarization) or frequency domain (SIP: Spectral Induce Polarization). The new algorithm could process data in time and frequency domain. The first step is to estimate the no linear self-potential in order to remove it. Second step is to compute resistivity and chargeability in time or frequency domain. The results show that the improvement of the processing is weak for the resistivity and for no noisy data but we have a better estimation of chargeability. The correlation highlight a good correlation between calculated out-phasing (in frequency domain) and chargeability (in time domain).

Mots clés: signal processing; waveform; complex resistivity; frequency response

Domaines: Géophysique [physics.geo-ph]

Deparis Jacques, Gance Julien, Orlando Leite. On the use of time series to improve signal processing of electrical data. 6th Asia Pacific Meeting on Near Surface Geoscience and Engineering incorporating the 15th SEGJ International Symposium, May 2024, Tsukuba, Japan. ⟨hal-04547470⟩