Practical limitations and applications of short dead time surface NMR

David O. Walsh, Elliot Grunewald, Peter Turner, Andrew Hinnell, Paul A Ferre

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

There is increasing interest in the unique measurement capabilities of nuclear magnetic resonance (NMR) for hydrologie applications. In particular, the ability to quantify water content (both bound and free) and to infer the permeability distribution are critical to hydrologists. As the method has gained in acceptance, there has been growing interest in extending its range to near-surface and vadose zone applications and to measurement in finer grained and magnetic soils. All of these applications require improved resolution of early-time signals, which requires shorter measurement dead times. This paper analyses three physical/electrical processes that limit the minimum achievable measurement dead times in surface NMR applications: 1) inherent characteristics of electromechanical and semiconductor switching devices, 2) the effective bandwidth of the receiver and signal processing chain, 3) transient signals associated with induced eddy currents in the ground. We then describe two applications of surface NMR that rely on reduced measurement dead time: detection and characterization of fast decaying NMR signals in silt and clay and the detection of fast decaying NMR signals in magnetic geology.

Original languageEnglish (US)
Pages (from-to)103-111
Number of pages9
JournalNear Surface Geophysics
Volume9
Issue number2
DOIs
StatePublished - Apr 2011

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nuclear magnetic resonance
time signals
signal processing
geology
eddy currents
vadose zone
acceptability
moisture content
clays
soils
permeability
silt
eddy
receivers
water content
bandwidth
clay
soil
detection

ASJC Scopus subject areas

  • Geophysics

Cite this

Practical limitations and applications of short dead time surface NMR. / Walsh, David O.; Grunewald, Elliot; Turner, Peter; Hinnell, Andrew; Ferre, Paul A.

In: Near Surface Geophysics, Vol. 9, No. 2, 04.2011, p. 103-111.

Research output: Contribution to journalArticle

Walsh, David O. ; Grunewald, Elliot ; Turner, Peter ; Hinnell, Andrew ; Ferre, Paul A. / Practical limitations and applications of short dead time surface NMR. In: Near Surface Geophysics. 2011 ; Vol. 9, No. 2. pp. 103-111.
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