1887

Abstract

Summary

The applicability of the magnetic resonance sounding (MRS) technique in urbanized areas is limited by the inherently weak signal from the subsurface water which is often deeply buried in noise from anthropogenic sources. The noise can have spatially variations on even sub-100 m scales and the signal to noise ratio of an MRS measurement can therefore be optimized by a careful choice of the exact location. In this paper we present an instrument for fast mapping and analysis of the noise conditions at a site prior to MRS experiments. The main components of the instrument are two induction receiver coils connected to amplifiers and a digital oscilloscope controlled by a PC. Analysis of the gathered data reveals the spatial distribution of the different noise components, in particular powerline harmonics and spikes. A comprehensive noise map of a test site is presented and analyzed.

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/content/papers/10.3997/2214-4609.20141953
2014-09-08
2024-04-24
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References

  1. Costabel, S. and Mueller-Petke, M.
    [2014] Despiking of magnetic resonance signals in time and wavelet domains. Near Surface Geophysics, 12(2), 185–197.
    [Google Scholar]
  2. Dalgaard, E., Auken, E. and Larsen, J.J.
    [2012] Adaptive noise cancelling of multichannel magnetic resonance sounding signals. Geophysical Journal International, 191, 88–100.
    [Google Scholar]
  3. Dluglosch, R., Mueller-Petke, M., Günther, T., Costabel, S. and Yaramanchi, U.
    [2011] Assessment of the potential of a new generation of surface nuclear magnetic resonance instruments. Near Surface Geophysics, 9, 89–102.
    [Google Scholar]
  4. Jiang, C., Lin, J., Duan, Q., Sun, S. and Tian, B.
    [2011] Statistical stacking and adaptive notch filter to remove high-level electromagnetic noise from MRS measurements. Near Surface Geophysics, 9(5), 459–468.
    [Google Scholar]
  5. Larsen, J.J., Dalgaard, E. and Auken, E.
    [2013] Noise cancelling of MRS signals combining model-based removal of powerline harmonics and multichannel Wiener filtering. Geophysical Journal International, 196(2), 828– 836.
    [Google Scholar]
  6. Walsh, D.O.
    [2008] Multi-channel surface NMR instrumentation and software for 1D/2D groundwater investigations. Journal of Applied Geophysics, 66, 140–150.
    [Google Scholar]
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