Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1986-11-20
1988-09-13
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
RE0327484
ABSTRACT:
A method of obtaining an NMR spectrum from a sample comprising the steps of: maintaining a static magnetic field along an axis which is homogeneous over at least a small volume constituting part of a sample applying a gradient to said magnetic field which varies in one direction orthogonal to said axis while applying an rf pulse to the sample to saturate all nuclei in the said volume except for a slab lying in a plane normal to the said one direction replacing the said gradient by a second gradient to said magnetic field which varies in a second direction orthogonal to said axis and said one direction while applying an rf pulse to the sample to saturate all nuclei in the said volume except for a slab lying in a plane normal to the said second direction, whereby nuclei in a narrow column extending parallel to the said axis have their spins left undisturbed replacing the second gradient by a third gradient to said static magnetic field which varies in a direction parallel to said axis while applying an rf pulse to the sample to selectively irradiate nuclei in a small region of the said column: and finally removing the third gradient and then reading out the free induction decay signal from the selectively irradiated nuclei in the presence of the static magnetic field alone.
REFERENCES:
patent: 4021726 (1977-05-01), Garroway
patent: 4041555 (1977-09-01), Rupp
patent: 4115730 (1978-09-01), Mansfield
Gordon Robert E.
Ordidge Roger J.
Oxford Research Systems Limited
Tokar Michael J.
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