Full-Wave Inversion von Off-Ground, Bohrloch- und Oberflächen-GPR
Conventional tomograms provided by standard ray-based methods have limited resolution, primarily because only a fraction of the information contained in the radar data is included in the inversion. Higher resolution radar tomograms can be derived by using full-waveform inversion schemes that take into account much of the recorded trace and exploit the full vector wavefield.
Großflächige Multi-Konfigurations-EMI-Charakterisierung
Due to recent system developments, large-scale EMI measurements are possible due to the fast measurement speed and easy coupling with GPS systems. The availability of multi-channel electromagnetic induction (EMI) systems that measure at several receiver coils enables a simultaneous sensing of electrical conductivity over different depth ranges.
Quantitative Mehrschicht-Leitfähigkeitsinversion von elektromagnetischen Induktionsmessungen mit mehreren Konfigurationen
A new calibration method that uses electrical resistivity tomography (ERT) inversion eliminates instrumental shifts which often occur in EMI data and returns quantitative apparent electrical conductivity values. Using different orientations, different coil offsets, and different frequencies, different sensing depths are obtained that are used for a multi-layer inversion.
Über Oberflächenwellenleiter aufgezeichnete Dispersionsinversion von GPR-Daten
Strong contrasts occurring in the shallow subsurface due to precipitation events, freezing, and thawing events, etc. can result in the presence of electromagnetic waveguides that cause dispersive GPR data. These data need to be inverted using dedicated inversion approaches.
