| 摘要 |
A magnetic field generating assembly for use in NMR apparatus. The assembly comprises one or more pairs of axially spaced, coaxially arranged main magnets (8), each pair comprising a pair of main magnets having opposite pole orientation; one or more pairs of shim magnets (8', 10) positioned between and arranged coaxially with the main magnets (8), each shim magnet having the same pole orientation as a respective nearest one of the main magnets; and one or more pairs of reversed shim magnets (9), each reversed shim magnet being positioned between and arranged coaxially with a respective main magnet and a respective shim magnet, wherein each reversed shim magnet has an opposite pole orientation to its respective main magnet and its respective shim magnet. The magnets are configured and arranged such that a working region (21) is defined radially spaced from the magnets, the magnetic field within the working region being suitable for obtaining NMR information from material in the working region.
|
