Electricity: measuring and testing – Particle precession resonance – Determine fluid flow rate
Patent
1990-08-07
1992-03-03
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Determine fluid flow rate
324309, G01R 3320
Patent
active
050936190
ABSTRACT:
In a method for the simultaneous measurement of spin resonance signals, in particular NMR signals, from layers located at different depths in a test volume, simultaneous excitation of the different layers is effected by a multiple-component rf excitation pulse P.sub.n, consisting of n individual components P.sub.m with the frequencies .omega..sub.m, which act selectively on defined layers m of the test volume, in the presence of a layer-selective gradient, the individual components P.sub.m having a phase displacement .phi..sub.m which is varied from one sequence to the next by successive addition of a constant phase increment .DELTA..phi..sub.m modulo 360 fixed individually for each individual component P.sub.m. If phase coding is effected according to the "Fast Fourier Flow Technique" with the aid of a bipolar gradient pulse, then the flow velocity of a medium moving through the test volume can be measured directly in a multi-dimensional Fourier transformation experiment, simultaneous for several flow cross-sections, in a single recording cycle.
REFERENCES:
patent: 4115730 (1978-09-01), Mansfield et al.
patent: 4318044 (1982-03-01), Mansfield
patent: 4484138 (1984-11-01), Bottomley et al.
patent: 4843322 (1989-06-01), Glover
Hackler Walter A.
Spectrospin AG
Tokar Michael J.
LandOfFree
Method for the simultaneous measurement of NMR signals, in parti does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for the simultaneous measurement of NMR signals, in parti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the simultaneous measurement of NMR signals, in parti will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-274499