期刊
JOURNAL OF MAGNETIC RESONANCE
卷 269, 期 -, 页码 179-185出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2016.06.008
关键词
NMR; Flow meter; Velocity distribution; Tikhonov regularisation
资金
- Faculty of Engineering, Computing and Mathematics at UWA
- ARC DECRA Fellowship [DE140101094]
- Australian Research Council [DE140101094] Funding Source: Australian Research Council
We demonstrate the use of Tikhonov regularisation as a data inversion technique to determine the velocity distributions of flowing liquid streams. Regularisation is applied to the signal produced by a nuclear magnetic resonance (NMR) flow measurement system consisting of a pre-polarising permanent magnet located upstream of an Earth's magnetic field NMR detection coil. A simple free induction decay (FID) NMR signal is measured for the flowing stream in what is effectively a 'time-of-flight' measurement. The FID signal is then modelled as a function of fluid velocity and acquisition time, enabling determination of the velocity probability distributions via regularisation. The mean values of these velocity distributions were successfully validated against in-line rotameters. The ability to quantify multi-modal velocity distributions was also demonstrated using a two-pipe system. (C) 2016 Elsevier Inc. All rights reserved.
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