| 摘要 |
The disclosed nuclear magnetic resonance apparatus has a permanent magnet formed by laterally magnetized bars which are rotatable around their longitudinal axis. If the bars have a circular cross-section, all bars in the magnet system are identical and only the magnetization direction of each bar needs to be matched to the magnetization direction required at the relevant position. If the direction of magnetization in the system satisfies alpha =2 phi at all times, where alpha is the magnetization direction and phi the polar coordinate of the relevant bar, efficient use is made of the magnetic material and, in contrast to other magnetization directions, it is possible to work without a return yoke.
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