Are the FW measuring systems able to measure both a uniform and a semi-uniform field? Why?
Yes, the NMR magnetometer actually is a so-called field volume-averaging NMR magnetometer. The measurement result is a volume-averaging field where the volume is the sample volume. Therefore, as long as the sample volume is small enough, the NMR magnetometer is able to measure certain gradient fields. In the FW magnetometer the sample size f 2mm x 3mm (9.4 mm3) is much smaller compare with size f 5mm x 4.5mm (88.3 mm3), which is a typical active sample size of a non-flowing water type NMR magnetometer.
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