Time-of-flight flow imaging using NMR remote detection
Time-of-flight flow imaging using NMR remote detection
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DOI：
10.1103/physrevlett.95.075503
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发表时间：
2005-08-12
影响因子：
8.6
通讯作者：
Song, YQ
中科院分区：
文献类型：
--
作者：
Granwehr, J;Harel, E;Song, YQ
介绍了一种利用核磁共振成像技术研究流体在多孔介质中流动和弥散的方法。当流体流过样品时，核自旋磁化被射频脉冲和磁场梯度调制，以编码流体的空间坐标。当液体离开样品时，它的磁化强度被第二个射频线圈记录下来。该方案不仅有利于流体流的时间依赖性成像，还允许编码和检测子系统的单独优化以提高整体灵敏度。该技术是证明通过成像气体流动通过多孔岩石。
A time-of-flight imaging technique is introduced to visualize fluid flow and dispersion through porous media using NMR. As the fluid flows through a sample, the nuclear spin magnetization is modulated by rf pulses and magnetic field gradients to encode the spatial coordinates of the fluid. When the fluid leaves the sample, its magnetization is recorded by a second rf coil. This scheme not only facilitates a time-dependent imaging of fluid flow, it also allows a separate optimization of encoding and detection subsystems to enhance overall sensitivity. The technique is demonstrated by imaging gas flow through a porous rock.