[1446] - Advances and limitations in electromagnetic induction

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von Hebel, C., 2014. Advances and limitations in electromagnetic induction. PhD Report, IBG-3, Juelich. Accessed from https://www.tr32db.uni-koeln.de/data.php?dataID=1446 at 2019-07-20.
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Title(s):Main Title: Advances and limitations in electromagnetic induction
Description(s):Abstract: Electromagnetic induction (EMI) systems operate under the low induction number (LIN) approximation that converts the measured magnetic field into an apparent electrical conductivity (ECa). In general, the recorded ECa values are used to characterize the shallow subsurface while any external current conducting media influence the measurements and cause a shift in the recorded ECa, which hinders a quantitative interpretation. To obtain accurate EMI data, we propose a new conversion method, investigate some external influences and show how to calibrate the measurements. The correct ECa conversion (CEC) accurately transfers the magnetic field ratios into ECa, while the LIN based conversion performs inaccurate. Hence, CEC is the preferred method. We show that the operator and/or the field setup strongly influence the measurements (data shifts up to 10 mS/m) and we show that the calibration performs only when the ECa data range along a calibration line exceeds at least 1.5 mS/m and when the electrical conductivity of the ground is larger than 5 mS/m. Incorporation of the conversion tool into computing solutions or possibly into measurement systems enhances accuracy, the recognition of the data shifts lead to better subsurface characterizations and the calibration enables quantitative statements about the research area. Hence, the presented procedures obtain more reliable EMI data compared to simply measured ones and will advance the EMI method.
Responsible Party
Creator(s):Author: Christian von Hebel
Publisher:CRC/TR32 Database (TR32DB)
TR32 Topic:Soil
Related Sub-project(s):B6
Subject(s):CRC/TR32 Keywords: Soil, PhD Report
File Details
File Name:CvH_EMI_report3.docx
Data Type:Text
File Size:2340 kB (2.285 MB)
Date(s):Valid: 2013-08-13
Mime Type:application/vnd.openxmlformats-officedocument.wordprocessingml.document
Download Permission:OnlyTR32
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:Ellebach
Measurement Location:Selhausen
Specific Informations - Report
Report Date:1st of April, 2014
Report Type:PhD Report
Report City:Juelich
Report Institution:IBG-3
Metadata Details
Metadata Creator:Christian von Hebel
Metadata Created:2016-05-03
Metadata Last Updated:2016-05-06
Funding Phase:2
Metadata Language:English
Metadata Version:V41
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