Flow measurement using nuclear magnetic resonance

Details Flow measurement using nuclear magnetic resonance Flow measurement using nuclear magnetic resonance

G - Physics

01

N

324/1, 73/69

G01N 24/08 (2006.01) G01R 33/563 (2006.01)

Patent

CA 1227947

Abstract of the Disclosure A modified spin echo sequence is employed to identify fluid movement in a material. The volume of interest is subjected to a static field along one axis (Z) and an RF magnetic excitation pulse transverse to the static field is applied which tilts the nuclear spins in the volume. The tilted nuclear spins are then allowed to process about the uniform static field in the presence of a gradient field whereby the nuclear spins become de- phased. Thereafter, a spin echo of the static spins is created by either a 180° Of pulse or reversal of the gradient field. Upon refocusing of the static nuclear spins a restoration RF pulse is applied to realign the stationary nuclear spins with the static field. Nuclear spins undergoing bulk motion as in fluid flow will be refocused to a different phase than the stationary spins so that the final RF pulse will in general leave these spins with a non-zero transverse magnetic moment. This residual transverse magnetic moment is then detected to identify the fluid movement.

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