Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1985-03-29
1986-12-02
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324310, G01R 3320
Patent
active
046267832
ABSTRACT:
The present invention relates to an improved nuclear magnetic resonance spectroscopy for selectively detecting multiple quantum transitions of a selected order, the transitions taking place in a sample containing a system of rotating magnetic resonators. The spectrometry comprises the steps of: (a) applying a pulse train to the resonators, the pulse train consisting of RF pulses in which at least one pulse is .phi. degrees out of phase with the last pulse; (b) detecting the free induction decay signal emanating from the resonators for a period of time t2 after the application of the pulse train, using two channels of detecting system which are 90.degree. out of phase with each other, and storing it in a memory. The steps are repeated changing the values of the evolution time t1, resetting the values of .phi., and adding 90.degree., 180.degree., and 270.degree. to all values of .phi.. The data are combined and converted to frequency domain by double Fourier transformation with respect to t1 and t2.
REFERENCES:
patent: 4134058 (1979-01-01), Ernst
patent: 4238735 (1980-12-01), Muller
patent: 4510449 (1985-04-01), Ernst
"Selective Detection of Multiple Quantum Transitions in NMR by Two-Dimensional Spectroscopy" by A. Wokaun et al., Chemical Physics Letters, Dec. 15, 1977, vol. 52, No. 3, pp. 407-412.
"Echoes and Antiechoes in Coherence Transfer NMR: Determining the Signs of Double-Quantum Frequencies" by Mareci et al., Journal of Magnetic Resonance, vol. 48, pp. 158-163 (1982).
Jeol Ltd.
Tokar Michael J.
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