Quantifying AEM system characteristics using a ground loop

Davis, A and MacNae, J 2008, 'Quantifying AEM system characteristics using a ground loop', Geophysics, vol. 73, no. 4, pp. F179-F188.


Document type: Journal Article
Collection: Journal Articles

Title Quantifying AEM system characteristics using a ground loop
Author(s) Davis, A
MacNae, J
Year 2008
Journal name Geophysics
Volume number 73
Issue number 4
Start page F179
End page F188
Total pages 10
Publisher Society of Exploration Geophysicists
Abstract Quantitative interpretation of time-domain airborne electromagnetic (AEM) data is hampered by uncertainty in altimetry, system geometry, transmitter waveform, data averaging, and timing. We present a simple calibration method that serves to define these issues by the use of a closed multiturn loop of known electrical and physical properties that is insulated from the ground beneath it. By predicting the secondary response of the AEM receiver and comparing it with the measured data, we have identified and quantified systematic errors mentioned above in several systems. In addition, we identify an alternative subprocess that uniquely calculates altimeter and geometry errors by measuring the current induced in a ground loop of known properties and comparing it with predictions. The ground-loop method is used best over resistive cover to minimize limitations caused by nonuniform conductive ground and is a calibration tool that makes AEM data consistent with quantitative models. Fluctuating geometric errors caused by bird swing limit the accuracy of applying the geometry corrections from one flyover to an entire survey.
Subject Electrical and Electromagnetic Methods in Geophysics
DOI - identifier 10.1190/1.2943189
ISSN 0016-8033
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