Fast measurements of average flow velocity by Low-Field 1H NMR

被引：42

作者：

Osan, T. M. ^{[1
]}

Olle, J. M. ^{[1
]}

Carpinella, M. ^{[1
]}

Cerioni, L. M. C. ^{[1
]}

Pusiol, D. J. ^{[1
]}

Appel, M. ^{[2
]}

Freeman, J. ^{[2
]}

Espejo, I. ^{[2
]}

机构：

[1] Spinlock SRL, Cordoba, Argentina

[2] Shell Int E&P Co, Houston, TX 77025 USA

来源：

JOURNAL OF MAGNETIC RESONANCE | 2011年 / 209卷 / 02期

关键词：

Flow; Flow-rate measurements; Velocity measurements; Low-Field NMR; NUCLEAR-MAGNETIC-RESONANCE; SPIN ECHOES; DIFFUSION; GRADIENT; BLOOD;

D O I：

10.1016/j.jmr.2010.07.011

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

In this paper, we describe a method for measuring the average flow velocity of a sample by means of Nuclear Magnetic Resonance. This method is based on the Carr-Purcell-Meiboom-Gill (CPMG) sequence and does not require the application of any additional static or pulsed magnetic field gradients to the background magnetic field. The technique is based on analyzing the early-time behavior of the echo amplitudes of the CPMG sequence. Measurements of average flow velocity of water are presented. The experimental results show a linear relationship between the slope/y-intercept ratio of a linear fit of the first echoes in the CPMG sequence, and the average flow velocity of the flowing fluid. The proposed method can be implemented in low-cost Low-Field NMR spectrometers allowing a continuous monitoring of the average velocity of a fluid in almost real-time, even if the flow velocity changes rapidly. (C) 2011 Published by Elsevier Inc.

引用

页码：116 / 122

页数：7

共 33 条

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