Method for flow measurement using nuclear magnetic resonance

Details Method for flow measurement using nuclear magnetic resonance Method for flow measurement using nuclear magnetic resonance

1983-07-19

1986-03-04

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Particle precession resonance

Determine fluid flow rate

324309, 128653, G01R 3320

Patent

active

045742405

ABSTRACT:
Flow rates across a flat panel are determined in a non-intrusive manner by a novel technique involving the use of nuclear magnetic resonance (NMR). NMR signals requiring two or more time-spaced nuclear spin excitations are generated in a selective manner, whereby at least two of the excitations are confined to preselected tomographic regions which are non-coextensive in the direction of flow, i.e., at least a portion of each region lies outside the other. The relative positions of the volumes ranges from a partial overlap to a complete separation with a gap in between. Flow detection is derived from signals reflecting movement from one such region to the other during the interval of time between the excitations. Quantitative or qualitative flow data may be obtained, including full range velocity distributions for systems where a range of velocities is present. The process is readily combined with known NMR imaging techniques to provide a two-dimensional array of flow data.

REFERENCES:
patent: 4021726 (1977-05-01), Garroway et al.
patent: 4297637 (1981-10-01), Crooks et al.
patent: 4318043 (1982-03-01), Crooks et al.
patent: 4442404 (1984-04-01), Bergmann
patent: 4468621 (1984-08-01), Hinshaw
Crooks et al., "Nuclear Magnetic Resonance Whole-Body Imager Operating at 3.5 KGauss.sup.1 ", Radiology, vol. 143, No. 1, pp. 169-174, Apr. 1982.
Garroway, "Velocity Measurements in Flowing Fluids by NMR", J. Phys.D: Appl. Phys., vol. 7, pp. L159-L163, Great Britain, 1974.

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