ANDERSON, MARVIN H,SCHLEICH, THOMAS W,JOHN, BOBAN K,SCHOOLERY, JAMES N
申请号：
NZ19980505419
公开号：
NZ505419(A)
申请日:
1998.12.23
申请国别(地区):
新西兰
年份:
2002
代理人:
摘要：
A magnet assembly 10 for a small scale NMR spectroscopy apparatus suitable for laboratory or home use, has two permanent magnets 11 facing one another so that the facing surfaces have opposite polarities, a pole cap 12 on each of the two facing surfaces of the permanent magnets 11, and a plurality of radially polarized canceling magnets 18 disposed about the permanent magnets 11 and pole caps 12. The position of the radially polarized canceling magnets 18 about the tapered pole caps 12 reduces leakage of the magnetic field, to maintain the magnetic field strength and homogeneity within the test region, without a disadvantageous increase in the size, weight and cost of the NMR apparatus. A curved edge ring shim 27 may be used to increase magnetic field homogeneity in the test region.
