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• W4246819983 abstract "PreviousNext You have accessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2014ADVANCEMENT OF NON-INVASIVE NMR SOIL MOISTURE SCANNERSAuthors: Dave WalshElliot GrunewaldHong ZhangDave WalshVista Clara Inc.Search for more papers by this author, Elliot GrunewaldVista Clara Inc.Search for more papers by this author, and Hong ZhangVista Clara Inc.Search for more papers by this authorhttps://doi.org/10.4133/SAGEEP.27-020 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract We present advancements of non-invasive NMR instruments for shallow soil and geotechnical applications. The core design, presented previously, uses a flat array of permanent magnets to provide sensitivity to NMR signals below the sensor. Depth profiling capabilities are achieved by adjusting the coil tuning frequency for selective excitation (in the range of 100-500 kHz). Advancements in both hardware and software have been implemented for improved data quality and acquisition efficiency. The investigation depth and sensitivity has been enhanced using a denser permanent magnet Halbach array and the echo spacing has been reduced to 600 microseconds allowing better detection of short clay-bound water signals. Quad-frequency electronics now provide detection at four depth levels with no increase in measurement time using interleaved acquisitions. The most recent sensor has selective acquisition depths ranging from 2.5-8.5” and typical measurement times on the order of 1-3 minutes. This sensor has been tested in a range natural soil environments with varying sand, organic, and clay content. The resulting NMR data provide precise and repeatable measurement of soil moisture, often with lower variance than coring and gravimetric methods, and further provide information about pore size and fluid mobility. Other tested applications include analysis of liquid moisture in partially frozen earth and engineered surfaces such as concrete and targets near rebar. The advanced design design includes a portable and modular control unit, which can be connected to various magnet and coil arrays scaled to different geometries. Simulations of larger arrays, with investigation depths approaching 1 m, have been investigated and shown to be feasible. It is anticipated that these new tools will dramatically enhance the efficiency and precision of soil and geotechnical investigations. Keywords: Soil Moisture, Geotechnical, NMR, Non-invasive, Magnetic ResonancePermalink: https://doi.org/10.4133/SAGEEP.27-020FiguresReferencesRelatedDetails Symposium on the Application of Geophysics to Engineering and Environmental Problems 2014ISSN (online):1554-8015Copyright: 2014 Pages: 559 publication data© 2014 Published in electronic format with permission by the Society of Exploration Geophysicists and Environment and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished: 25 Aug 2014 CITATION INFORMATION Dave Walsh, Elliot Grunewald, and Hong Zhang, (2014), ADVANCEMENT OF NON-INVASIVE NMR SOIL MOISTURE SCANNERS, Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 44-44. https://doi.org/10.4133/SAGEEP.27-020 Plain-Language Summary KeywordsSoil MoistureGeotechnicalNMRNon-invasiveMagnetic ResonancePDF DownloadLoading ..." @default.
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• W4246819983 date "2014-03-20" @default.
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• W4246819983 title "ADVANCEMENT OF NON-INVASIVE NMR SOIL MOISTURE SCANNERS" @default.
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