| 摘要 |
PURPOSE:To enhance the degree of the spatial uniformity of a magnetic field, in a NMR apparatus having a main magnetic field generating means and a magnetic field distribution correcting means, by regulating a magnetic field using a plurality of samples different in a volume generating NMR signals. CONSTITUTION:A main coil 20 is provided as a main magnetic field generating means and a shim coil 3A is provided as a magnetic field distribution correcting means. To a spherical highly uniform magnetic field region 21, a second sample 22 having a volume smaller than that of the magnetic field region 21 is arranged to uniformize a magnetic field. Next, the second sample 22 is detached and a first sample having the same shape as the highly uniform magnetic field region 21 is arranged to highly uniformize the magnetic field. The first and second samples generate NMR signals. At this time, at first, a primary non- uniform magnetic field component is removed by the second sample 22 and, then, a second non-uniform magnetic field component is removed by the first sample to highly uniformize the magnetic field region. Because the magnetic field is uniformized preliminarily by the small volume sample, the magnetic field is highly uniformized lastly and NMR can be measured with high accuracy.
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