Generally, high-field NMR means the magnet field is higher than 1 Tesla, middle-field NMR means the magnet field is between 1 Tesla and 0.5Tesla, low-field NMR means the magnet field is lower than 0.5T. They have different application fields.Low-field NMR is used for analyzing the reaction among molecules. For example, water can be divided into combine water, free water according to water molecule’s phase, cross-link density of polymer. And high-field NMR is used for molecule structure analysis.
->1T (Imaging quality)
-superconducting magnet (Homogeneity)
-Heavy, expensive, higher maintenance cost
-<1T (Less effect by ferromagnetic material )
-permanent magnet (no maintenance cost)
-Low weight, portable, inexpensive
Low-Field NMR analyzer is more suitable for porous media analysis