Journal ArticleDOI
Multi-channel surface NMR instrumentation and software for 1D/2D groundwater investigations
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TLDR
In this article, reference coil-based noise cancellation and integrated FID imaging are used to increase the effective signal to noise ratios by an order of magnitude or more, which enables multi-coil surface NMR to produce useful and reliable images when the post-averaged SNR is less than 1.About:
This article is published in Journal of Applied Geophysics.The article was published on 2008-12-01. It has received 184 citations till now. The article focuses on the topics: Noise spectral density & Noise (signal processing).read more
Citations
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A Review of the Principles and Applications of the NMR Technique for Near-Surface Characterization
TL;DR: A comprehensive review of the recent advances in nuclear magnetic resonance (NMR) measurements for near-surface characterization using laboratory, borehole, and field technologies is presented in this article.
Journal ArticleDOI
Adaptive noise cancelling of multichannel magnetic resonance sounding signals
TL;DR: The results show that within the experimental uncertainty the two methods give identical results, and the design and the efficiency of different stacking methods are compared to time-domain multichannel Wiener filtering.
Journal ArticleDOI
A Small-Diameter NMR Logging Tool for Groundwater Investigations
David O. Walsh,Peter Turner,Elliot Grunewald,Hong Zhang,James J. Butler,E. C. Reboulet,Steve Knobbe,Tom Christy,John W. Lane,Carole D. Johnson,Tim Munday,Andrew Fitzpatrick +11 more
TL;DR: A small-diameter nuclear magnetic resonance (NMR) logging tool has been developed and field tested at various sites in the United States and Australia and provides reliable, direct, and high-resolution information that is of importance for groundwater studies.
Journal ArticleDOI
Noise cancelling of MRS signals combining model-based removal of powerline harmonics and multichannel Wiener filtering
TL;DR: It is shown that noise cancelling can be improved if the multiple origins of noise are taken into account and a method is developed where powerline harmonics are efficiently removed through a modelbased approach.
Journal ArticleDOI
The effect of pore size and magnetic susceptibility on the surface NMR relaxation parameter T 2
Elliot Grunewald,Rosemary Knight +1 more
TL;DR: In this article, a combination of numerical and laboratory experiments is used to systematically explore the effect of two key geologic properties, pore size and magnetic susceptibility, on the T 2 * relaxation process.
References
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Book
Adaptive Filter Theory
TL;DR: In this paper, the authors propose a recursive least square adaptive filter (RLF) based on the Kalman filter, which is used as the unifying base for RLS Filters.
Journal ArticleDOI
Nuclear magnetic resonance as a geophysical tool for hydrogeologists
TL;DR: In this article, the results of 7 borehole pumping tests and 13 proton Magnetic Resonance Sounding (MRS) measurements are compared to the results obtained through NMR logging.
Journal ArticleDOI
A new direct non-invasive groundwater detection technology for Australia
M. Schirov,A. Legchenko,G. Creer +2 more
TL;DR: In this paper, the authors present results of Hydroscope tests on sedimentary, water-containing rocks in South-Eastern Australia, undertaken during February and March 1990, together with several theoretical and experimental results obtained previously by the developers of the NMR water prospecting technology, are presented.
Journal ArticleDOI
Inversion of surface NMR data
TL;DR: The main advantage of the surface nuclear magnetic resonance (NMR) method compared to other geophysical methods in the field of groundwater investigation is the ability to measure an NMR signal directly from the water molecules as discussed by the authors.
Journal ArticleDOI
Surface‐to‐volume ratio, charge density, nuclear magnetic relaxation, and permeability in clay‐bearing sandstones
TL;DR: In this article, the authors found the following correlations between volume-to-surface ratio Vp/S, permeability to fluid flow k, exchange cation molarity Qv, and proton NMR decay constant T1 in water-saturated rocks.
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