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便携式核磁共振仪,已经用于低温和Bitter 磁铁很不均匀的强磁场测量。该仪器有两个显著特点,其一,同轴共振器用1/4谐振波长的同轴管将探头和振荡器联结起来;其二是,仅用了一个场效应管的振荡器。为了复盖整个测量范围,使用了 H_-,~(205)Tl_-,~7Li_-,~(27)Al_-,~2H_-和~(35)Cl_-原子核。为了提高共振信号,还用了一个辅助线圈系统,在测量中同时补偿磁场的非均匀性及提供一个周期性扫描场。该测试仪已经用于153T 的 Bitter 磁铁检定。并还可测高达26T 的磁场。
Portable nuclear magnetic resonance has been used for the measurement of strong magnetic fields with very uneven temperature and Bitter magnets. The instrument has two notable features. First, the coaxial resonator uses a quarter-wave coaxial tube to connect the probe to the oscillator. The second is that it uses only one FET’s oscillator. In order to cover the entire measurement range, H_-, ~ (205) Tl_-, ~ 7Li_-, ~ (27) Al_-, ~ 2H_- and ~ (35) Cl_- nuclei were used. In order to improve the resonance signal, an auxiliary coil system is also used, which compensates for the non-uniformity of the magnetic field and provides a periodic field in the measurement. The tester has been used for 153T Bitter magnet testing. And can measure up to 26T magnetic field.