[1284] - Improved calibration and inversion of electromagnetic induction data

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von Hebel, C., 2014. Improved calibration and inversion of electromagnetic induction data. PhD Report, IBG-3, Juelich. Accessed from http://www.tr32db.uni-koeln.de/data.php?dataID=1284 at 2019-04-25.
Title(s):Main Title: Improved calibration and inversion of electromagnetic induction data
Description(s):Abstract: Electromagnetic induction (EMI) systems are said to 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. However, 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 external influences and show how to calibrate the measurements. The correct ECa conversion (EEC) accurately transfers the magnetic field ratios into ECa, while the LIN-based conversion performs inaccurately. Hence, EEC 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). We also show that the calibration works 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 higher than 5 mS/m. And finally we incorporate the EEC into a sophisticated EMI inversion scheme and show that EEC outperforms LIN based conversion. The suggested methods provide several advantages: Incorporating the EEC method into computing solutions or possibly into measurement systems enhances accuracy; recognizing the data shifts leads to better subsurface characterizations; and calibration enables quantitative statements about the research area. Hence, the presented procedures lead to more reliable EMI data and will improve 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_report4.docx
Data Type:Text
File Size:127 kB (0.124 MB)
Date(s):Valid: 2013-08-13
Mime Type:application/vnd.openxmlformats-officedocument.wordprocessingml.document
Data Format:MS word
Download Permission:OnlyTR32
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
North:-no map data
Measurement Region:NorthRhine-Westphalia
Measurement Location:--NorthRhine-Westphalia--
Specific Informations - Report
Report Date:1st of April, 2014
Report Type:PhD Report
Report City:Juelich
Report Institution:IBG-3
Further Informations:figures that belong to text
Metadata Details
Metadata Creator:Christian von Hebel
Metadata Created:2016-10-12
Metadata Last Updated:2016-10-12
Funding Phase:2
Metadata Language:English
Metadata Version:V41
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