Not extinct yet: innovations in frequency domain HEM triggered by sea ice studies

Andreas A. Pfaffhuber; Stefan Hendricks

doi:10.1071/EG14034

6th International Conference in Airborne Electromagnetics (AEM 2013)

ISSN: 0812-3985
E-ISSN: 1834-7533

oa Not extinct yet: innovations in frequency domain HEM triggered by sea ice studies
Authors Andreas A. Pfaffhuber^a,c and Stefan Hendricks^b
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^a Norwegian Geotechnical Institute (NGI), Sognsveien 72, 0806 Oslo, Norway. ^b Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI), Bussestrasse 24, 27570 Bremerhaven, Germany. ^c Corresponding author. Email: [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 46, Issue 6th International Conference in Airborne Electromagnetics (AEM 2013), Mar 2015, p. 64 - 73
DOI: https://doi.org/10.1071/EG14034
- Received: 21 Mar 2014
- Accepted: 21 Aug 2014
- Published online: 01 Mar 2015

Abstract

[

The last 15 years have brought major innovations in helicopter towed time domain electromagnetics (EM), while few further developments have been made within the classic frequency domain segment. Operational use of frequency domain EM for sea ice thickness mapping acted as a driving force to develop new concepts such as the system under our consideration. Since its introduction we have implemented new concepts aiming at noise reduction and drift elimination. We decreased signal noise base levels by one to two orders of magnitude with changes to the signal transmission concept. Further, we increased the receiver coil dynamic range creating an EM setup without the need for primary field bucking. Finally, we implemented control signals inside the receiver coils to potentially eliminate system drift. Ground tests demonstrate the desired noise reduction and demonstrate drift control, leading to essentially drift free data. Airborne field data confirm these results, yet also show that the procedures can still be improved. The remaining quest is whether these specialised system improvements could also be implemented in exploration helicopter EM (HEM) systems to increase accuracy and efficiency.

Operational use of frequency domain HEM for sea ice thickness mapping was the driving force for developing new purpose-designed systems. We present improvements in decreasing noise levels by one to two orders of magnitude, and implemented control signals to eliminate system drift. Ground tests and airborne field data confirmed the achievement of these goals.

]

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/content/journals/10.1071/EG14034

Not extinct yet: innovations in frequency domain HEM triggered by sea ice studies

Exploration Geophysics 46, 64 (2015); https://doi.org/10.1071/EG14034

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Article Type: Research Article

Keyword(s): AEM; drift; frequency domain; HEM; seaice

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oa Not extinct yet: innovations in frequency domain HEM triggered by sea ice studies

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