| 摘要 |
PROBLEM TO BE SOLVED: To perform a more precise measurement whose error is small by suppressing the detection of a background signal as far as possible. SOLUTION: In this nuclear magnetic resonance apparatus, a cylindrical conductor shield member 30 is pasted in the lower end part on the outer circumferential face of the vacuum double tube 8 of a sample coil bobbin 2. The shield member 30 is arranged between an O-ring 7 and the double vacuum tube 8 in such a way that the O-ring 7 of a first support 3 is shielded from the outside of the vacuum double tube 8 with reference to a sample coil 6, and a background signal (an NMR signal) which is output from the O-ring 7 is shielded with reference to the sample coil 6, Thereby, a probe hardly detects the background signal from the O-ring 7, and a more precise measurement whose error is small can be performed.
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