Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1980-04-21
1982-07-13
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324311, G01N 2700
Patent
active
043397166
ABSTRACT:
In a NMR pulse sequence dispersion caused by inhomogeneity in the steady axial magnetic field may be reduced by applying a 180.degree. `spin-echo` RF pulse. However, whereas it is possible in known pulse sequences to apply a 90.degree. RF pulse in the presence of a selected gradient and to phase correct it adequately, this is not true for the 180.degree. pulse needed in a simple echo system (or the multiple pulses of more complex systems). It has been thought that a 180.degree. pulse could not then be use. It is proposed to apply the 90.degree. H.sub.1 pulse in the absence of an axial field gradient. For this purpose it is desirable to apply the RF field and sense the resonance with different coils. The RF coils should be of substantially greater extent in the axial direction than the resonance sensing coils.
REFERENCES:
patent: 3474329 (1969-10-01), Waugh
patent: 3932805 (1976-01-01), Abe
patent: 4015196 (1977-03-01), Moore
patent: 4021726 (1977-05-01), Garroway
patent: 4115730 (1978-09-01), Mansfield
Picker International Limited
Tokar Michael J.
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