Assessment of Improved Measurement Technology for Magnetic Resonance Sounding

Mueller-Petke, M.; Costabel, Stephan; Lange, Ger de; Yaramanci, U.

doi:10.3997/2214-4609.20147098

Cited by 2 publications

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“…This comparison result was derived using the same original data set but with different processing parameters. We used a narrower bandwidth of 100 Hz (adding 10 ms of effective dead time) and also clipped the first 26 ms of data prior to the inversion to yield an effective dead time of 40 ms, which can be achieved using other surface NMR instruments (Müller-Petke et al 2009).…”

Section: Experimental Results Detection and Characterization Of Grounmentioning

confidence: 99%

“…The original surface NMR instrument designs (e.g., Hydroscope and Numis) exhibited effective dead times in the range of 30-40 ms (Bernard 2007;Müller-Petke et al 2009). In 2008, a new commercial instrument (GMR) was introduced that operated with a fixed measurement dead time of 8 ms and produced an effective post-processed dead time of 10 ms plus 1/BW, where BW is the user-selected processing bandwidth in Hz.…”

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Practical limitations and applications of short dead time surface NMR

Walsh

Grunewald

Turner

et al. 2010

Near Surface Geophysics

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There is increasing interest in the unique measurement capabilities of nuclear magnetic resonance (NMR) for hydrologic 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.

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Section: Experimental Results Detection and Characterization Of Grounmentioning

confidence: 99%

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confidence: 99%