In studies of the transport in porous materials it is very important
to measure concentration profiles of moisture and ions. Nuclear
Magnetic Resonance (NMR) is a powerful technique to measure the time
evolution of e.g. moisture profiles with a high spatial resolution.
However, many technological porous materials contain large amounts
of paramagnetic ions, which complicates the NMR measurements.
Therefore the moisture transport is studied using specially
developed NMR scanners which have the possibility to measure
quantitative using a Faraday shield. Here a short oveview is give of
the instruments and the main characteristics
1.5 T - 60 Mhz
3D medical imaging
insert high temperature >300oC,
grad 0.3 T/m
H/Na imaging
4.7T - 200 Mhz
digital
NMR (Spincore based)
1D,
grad 0.6 T/m max grad
H, Li, Na, Cl imaging
0.7 T - 31 Mhz
digital NMR (Spincore based)
1D,
grad 0.6 T/m max
H-imaging
0.8 T - 33.1 Mhz
digital
NMR (Spincore based)
1D, grad max 0.3 T/m
H/Na imaging
0.7 T - 30 Mhz
digital NMR (Spincore based)
2D, max grad 0.3 T/m
H, Na, Li imaging
0.8 T - 34 Mhz
digital NMR (Spincore
based)
1D, max grad 0.4T/m
H,Li,Na imaging
1.5 T - 60 Mhz
analog NMR
1D, grad 36 T/m continous
H imaging
1.5 T - 60 Mhz
analog NMR
1D, grad 40 T/m continous
H imaging
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