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Surface-NMR in High Noise Areas
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics, Sep 2015, Volume 2015, p.1 - 5
Abstract
Summary
One of the main noise sources in surface-NMR data is the harmonic components of the fundamental 50 Hz powerline signal. In some circumstances, the surface-NMR data are distorted by several unrelated harmonic series. We present surface-NMR data from Ristrup, Denmark, where two harmonic series are present in the data and the noise level is almost an order of magnitude higher than typical Danish surface-NMR data. Noise reduction using standard multichannel Wiener filtering is shown to be inadequate for retrieval of the NMR signal. We show that the NMR signal can be retrieved by sequential fitting and subtraction of the harmonic series using a model-based approach.
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