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本文提出了一个低温核磁共振磁强计的设计方案,用环氧树脂粘合的高纯铝(27~Al)粉末做核磁共振样品(γ/2π=11.1119±0.0002MHz/T).它具有1.2M长的探测杆,能直接在液氦温度下(4.2K)测定超导磁体内的磁场强度,测量范围为1～13.5T,精度为10~(-5),并具有自动搜索与跟踪功能,跟踪速度约为10mT/s.利用样品中环氧树脂的1~H核,可使低温条件下的测量下限延伸到0.24T.在使用水中1~H核室温测磁时,测量范围为25mT-4T,改用重水中2~H核后,测量范围可延伸到25T,精度为10~(-6).
In this paper, a cryogenic NMR magnetometer design scheme is proposed, in which an NMR sample (γ / 2π = 11.1119 ± 0.0002MHz / T) is made from an epoxy bonded high purity aluminum (27 ~ M long probe can directly measure the magnetic field strength in the superconducting magnet at liquid helium temperature (range: 1 ~ 13.5T, accuracy: 10 ~ -5), with automatic search and tracking function , The tracking speed is about 10mT / s.Using the 1 ~ H core of the epoxy resin in the sample, the lower limit of measurement can be extended to 0.24T at low temperature.When measuring the magnetic field of 1 ~ H core in room temperature, the measuring range is 25mT -4T, switch to heavy water 2 ~ H nuclear, the measurement range can be extended to 25T, the accuracy of 10 ~ (-6).