Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-12-29
1978-03-28
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 5AC, 324 5R, G01R 3300
Patent
active
040817423
ABSTRACT:
A method is described for the quantitative analysis of a solution in which the solvent produces a nuclear magnetic resonant (NMR) spectral peak that dominates the system. A first spectrum containing the peak is made by operation of a nuclear magnetic resonant spectrometer at a first gain setting. The NMR apparatus is a pulse-modulated, Fourier-transform type spectrometer. A second spectrum is produced in which a 180.degree. pulse is applied to invert the spectral component magnetization followed after a period of time by a 90.degree. pulse. The period of time is sufficient to allow the solvent or component producing the unwanted peak to relax from the inverted state to a point where there is minimum magnetization along the longitudinal axis. At this point, in many solutions the other components have completely relaxed so that the 90.degree. pulse produces a free induction decay signal which, after undergoing the Fourier-transformation, yields a spectrum that does not include any significant peak due to the solvent. Thereafter, the quantitative analysis is performed by measuring the areas under the respective component peaks and simultaneously solving a series of equations in which the weight of the various components is proportional to the respective areas under the peaks and to the gain settings of the spectrometer.
REFERENCES:
patent: 3674998 (1972-07-01), Benz
patent: 3781650 (1973-12-01), Keller
patent: 3873909 (1975-03-01), Ernst
patent: 3968424 (1976-07-01), Ernst
Hofer Donald C.
Kahwaty Vincent N.
Valentino Carl R.
International Business Machines - Corporation
McKechnie D. R.
Tokar M.
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