000878387 001__ 878387
000878387 005__ 20250129092415.0
000878387 0247_ $$2Handle$$a2128/25933
000878387 0247_ $$2URN$$aurn:nbn:de:0001-2020102027
000878387 0247_ $$2ISSN$$a1866-1777
000878387 020__ $$a978-3-95806-490-4
000878387 037__ $$aFZJ-2020-02823
000878387 041__ $$aEnglish
000878387 1001_ $$0P:(DE-Juel1)166373$$aTan, Xihe$$b0$$eCorresponding author$$ufzj
000878387 245__ $$aDevelopment of Electromagnetic Induction Measurement and Inversion Methods for Soil Electrical Conductivity Investigations$$f- 2020-10-20
000878387 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2020
000878387 300__ $$aix, 124 S.
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000878387 3367_ $$2ORCID$$aDISSERTATION
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000878387 3367_ $$02$$2EndNote$$aThesis
000878387 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1608218979_29744
000878387 3367_ $$2DRIVER$$adoctoralThesis
000878387 4900_ $$aSchriften des Forschungszentrums Jülich. Reihe Information / Information$$v62
000878387 502__ $$aRWTH Aachen, Diss., 2020$$bDissertation$$cRWTH Aachen$$d2020
000878387 520__ $$aElectromagnetic induction (EMI) is a promising contact-free technique for non-invasive nearsurface geophysical investigations. Frequency-domain rigid-boom EMI systems with fixed distances between transmitter (Tx) and receivers (Rx) have been increasingly used for characterizing the upper meters (up to depths of approximately 1.5 times the maximum coil separation) of the subsurface. Such EMI systems enable the estimation of subsurface electrical conductivity distributions by inverting the apparent electrical conductivity (ECa) values measured from multiple different Tx-Rx configurations. However, calibration issues due to the thermal effects of the internal electronics as well as external electromagnetic influences hinder a reliable quantitative EMI data analysis. For a custom-made EMI system, a transfer function analyzer (TFA) circuit is developed to monitor thermal drift effects of the electrical parameters of the receiver circuit. In addition, ambient temperature sensors (ATS) were included into the setup. Here, three correction methods were compared based on data from ATS, TFA, and a combination of both TFA and ATS. The presented work tested these three methods in three different experimental studies where the transmitter unit temperature is kept constant while the receiver unit is heated and cooled (1) manually, (2) by cloudy ambient conditions and (3) by partly sunny weather conditions. The results demonstrate that the TFA in the receiver circuit provides suitable data for correcting the phase drift originated within the receiver coil but not for correcting the drift caused by electrical components in the read-out circuit. The latter drifts need to be corrected using ATS data. Consequently, the combination of TFA and ATS data returned the best correction results achieving a worst-case accuracy of 2.3mS/m compared to 10.2mS/m (ATS-only) and 24.9mS/m (TFA-only). The experimental results indicate that the drift of the transmitter unit is not negligible and needs to be corrected by a similar TFA circuit that should be investigated in future studies. In addition to the thermal effects, the external electromagnetic influences also shift the measured ECa data which are caused by the presence of the operator, cables or metallic objects included in the field setup. The presented work introduces a novel multi-elevation [...]
000878387 536__ $$0G:(DE-HGF)POF3-255$$a255 - Terrestrial Systems: From Observation to Prediction (POF3-255)$$cPOF3-255$$fPOF III$$x0
000878387 8564_ $$uhttps://juser.fz-juelich.de/record/878387/files/Information_62.pdf$$yOpenAccess
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000878387 915__ $$0LIC:(DE-HGF)CCBY4$$2HGFVOC$$aCreative Commons Attribution CC BY 4.0
000878387 9141_ $$y2020
000878387 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)166373$$aForschungszentrum Jülich$$b0$$kFZJ
000878387 9131_ $$0G:(DE-HGF)POF3-255$$1G:(DE-HGF)POF3-250$$2G:(DE-HGF)POF3-200$$3G:(DE-HGF)POF3$$4G:(DE-HGF)POF$$aDE-HGF$$bErde und Umwelt$$lTerrestrische Umwelt$$vTerrestrial Systems: From Observation to Prediction$$x0
000878387 920__ $$lyes
000878387 9201_ $$0I:(DE-Juel1)ZEA-2-20090406$$kZEA-2$$lZentralinstitut für Elektronik$$x0
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