Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1992-03-13
1994-12-06
Snow, Walter E.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
053714652
ABSTRACT:
In an inspection apparatus using nuclear magnetic resonance (NMR), a spatial distribution of homogeneity of a static magnetic field can be quickly measured even when a heterogeneous object is inspected, by measuring simultaneously phase data and a transverse relaxation time at the same spatial position of the heterogeneous object, removing the difference of a phase term due to a chemical shift by anticipating components at that position and obtaining only the phase data resulting from static magnetic field inhomogeneity. A plurality of low-pass filters are provided to a shim power supply unit for driving a shim coil for generating additional static magnetic fields to correct static magnetic field homogeneity so that a low-pass filter having a small time constant is used at the time of adjustment of static magnetic field homogeneity so as quickly adjust static magnetic field homogeneity, and a low-pass filter having a large time constant is used at the time of the actual measurement of the object in order to prevent degradation of S/N of signals.
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Onodera Yukari
Suzuki Ryuichi
Yamamoto Etsuji
Hitachi , Ltd.
Mah Raymond Y.
Snow Walter E.
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