[H-TT19] New Developments in Shallow Geophysics

[HTT19-01] Development of a magnetic resonance surface scanner for near surface geophysics

*Yoshito Nakashima¹ (1.National Institute of Advanced Industrial Science and Technology)

Keywords: in-situ measurement, proton NMR, water

Magnetic resonance (MR) technique enables us to quantify water protons in geo-materials such as concrete. The technique was applied to a portable in-situ surface scanner for the liquid water detection in near surface geophysics. The MR system comprises a Nd-Fe-B magnet with an investigation depth of 3cm, and the proton Larmor frequency is a few megahertz. The raw MR data are the time-domain CPMG waveforms from which water volume fractions and pore sizes could be estimated. The details of the principle and system being conducted will be disclosed in the presentation.

Reference: Nakashima, Y. (2015) Development of a Single-Sided Nuclear Magnetic Resonance Scanner for the In Vivo Quantification of Live Cattle Marbling. Applied Magnetic Resonance, 46, 593-606. Open access at http://dx.doi.org/10.1007/s00723-015-0657-4