Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-06-05
1979-09-18
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 05R, G01R 3308
Patent
active
041684621
ABSTRACT:
A method is disclosed for highly sensitive indirect detection of nuclear magnetic resonance of nuclei having a low gyromagnetic ratio using pulse techniques. The method employs a coherent transfer of transverse magnetization from the nuclei of interest to nuclei of high gyromagnetic ratio for which the free induction decay, S (t.sub.2), is observed as a function of the length of the time interval, t.sub.1, between imposition of transverse magnetization upon the nuclei of interest and transfer of magnetization to the observed nuclei. Contribution to the observed resonances not arising from the transferred transverse magnetization is eliminated and the resulting function S (t.sub.1, t.sub.2) is double Fourier transformed to the frequency domain and displayed as a two dimensional plot for resolving the multiplet spectral structure of the spectra of the nuclei having such low gyromagnetic ratio.
REFERENCES:
patent: 2887673 (1959-05-01), Hahn
patent: 3824452 (1974-07-01), Freeman
patent: 3909705 (1975-09-01), Tschopp
patent: 4068161 (1978-01-01), Ernst
Berkowitz Edward H.
Cole Stanley Z.
Tokar M.
Varian Associates Inc.
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