| 摘要 |
The nuclear magnetic resonance apparatus includes a magnet assembly constructed around a sample chamber (102). The magnet assembly provides a non-uniform magnetic field having a known magnetic field gradient inside the sample chamber, It is constructed of two opposing permanent magnets (106, 108) with pole pieces (110, 112) that may comprise differing volumes of material or with faces (116) angled towards each other in order to create a gradient. The apparatus may be used in connection with a variety of different tools, including a down-hole side-wall coring tool as well as with manufacturing process controllers, such as for wood drying. |
