Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-05-24
1980-01-15
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324313, G01R 3308
Patent
active
041841107
ABSTRACT:
Nuclear magnetic resonance is excited in a sample subjected a magnetic field having a varying component which defines a localized volume approximating to a line or surface, the field within the localized volume being invariant with time but exhibiting a spatial gradient. The r.f. irradiation is in the form of a pulse train such that the signal received from the sample contains continuous wave components respectively dependent on the density of relevant nuclei in different regions of the localized volume. The amplitudes of these components are determined by coherently detecting the received signal, sampling the detected signal(s) and subjecting the resultant data to Fourier transformation.
REFERENCES:
patent: 3530371 (1970-09-01), Nelson et al.
patent: 3789832 (1974-02-01), Damadian
patent: 4015196 (1977-03-01), Moore et al.
National Research Development Corporation
Tokar M.
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