Theoretical analysis of the two-coil method for measuring fluid flow using nuclear magnetic resonance

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Abstract
A theoretical study of the application of pulsed NMR to the measurement of fluid flow was made. Calculations of detector signal line shapes, for a 2-coil NMR laboratory experiment, were performed with a computer to determine the appropriate choice of flow signature. Results of calculations are presented which show the sensitivity of the method to various experimental parameters. The position of the received peak signal, in time, correlated directly with mean flow velocity. The shape of the received signal depended markedly upon the state of flow, i.e., laminar, turbulent (plug). Accurate determinations of flow required a knowledge of flow type. The theoretical calculations provided a better understanding of the potential of NMR for measuring fluid or blood flow.

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