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UP: Fachverband Umweltphysik
UP 5: Boden- und Agrarphysik
UP 5.3: Talk
Thursday, March 5, 2009, 10:54–11:06, VMP 8 R206
Relaxation measurements and water imaging in sand/clay phantoms — •Laura - Roxana Stingaciu1, Andreas Pohlmeier1, Peter Blümler2, Lutz Weihermüller1, Dagmar van Dusschoten2, Siegfried Stapf3, and Harry Vereecken1 — 1Forschungzentrum Jülich, ICG-IV, Agrosphere, 52425, Germany — 2Forschungzentrum Jülich, ICG-III, Phytosphere, 52425, Germany — 3Dept. of Technical Physics II University of Technology, 98684 Ilmenau, Germany
The present work reports two NMR study at 7 Tesla and 0.1 Tesla (high and low magnetic field) on ideal soil sample. A number of sand-clay phantoms have been used, each with a different amount of water (from saturation value to minimum concentration necessary to obtain an NMR signal) and with a different concentration of clay. Basic NMR protocol was employed, the Carr-Purcell-Meiboom-Gill sequence (CPMG) used for determining the bulk T2 value for echo time(TE) of 150 ms. This parameter is affected by the soil properties like: pore-size distribution, dry bulk density, water content, magnetic susceptibility, etc. In addition, imaging experiments were applied using the 4.7 Tesla magnets and the multi-echo-multi-slice sequence (memshrp) for a coaxial sand-clay sample, trying to map and estimate the water distribution in the sample.