Flow measurement using nuclear magnetic resonance

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

1984-10-22

1987-03-03

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324312, 324313, G01R 3320

Patent

active

046478574

ABSTRACT:
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 precess about the uniform static field in the presence of a gradient field whereby the nuclear spins become dephased. Thereafter, a spin echo of the static spins is created by either a 180.degree. RF 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.

REFERENCES:
patent: 4115730 (1978-09-01), Mansfield
patent: 4165479 (1979-08-01), Mansfield
patent: 4509015 (1985-04-01), Ordidge
patent: 4516075 (1985-05-01), Moran
patent: 4516582 (1985-05-01), Redington
patent: 4523596 (1985-06-01), Macovski
patent: 4528985 (1985-07-01), Macovski
patent: 4532473 (1985-07-01), Wehrli
patent: 4532474 (1985-07-01), Edelstein

Affiliated with

Also associated with

Rating

Flow measurement using nuclear magnetic resonance does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Flow measurement using nuclear magnetic resonance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flow measurement using nuclear magnetic resonance will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1019078