Low magnetic field measurement by NMR using polarized flowing water

A nuclear magnetic resonance (NMR) experiment using polarized flowing water is performed to measure low magnetic field. The periodic changes of signal amplitude and phase for the increasing applied RF field are ascribed to the sinusoidal variation in the resonance transition. The NMR signal with a good signal-to-noise ratio is demonstrated down to 0.1 mT range to determine the field within the uncertainty of a few tens per million.<
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