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APS » Journals » Phys. Rev. Lett. » Volume 95 » Issue 7
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Phys. Rev. Lett. 95, 075503 (2005) [4 pages]

Time-of-Flight Flow Imaging Using NMR Remote Detection

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J. Granwehr*, E. Harel, S. Han†, S. Garcia, and A. Pines
Materials Sciences Division, Lawrence Berkeley National Laboratory, and Department of Chemistry, University of California at Berkeley, Berkeley, California 94720-1460, USA

P. N. Sen and Y.-Q. Song‡
Schlumberger-Doll Research, 36 Old Quarry Road, Ridgefield, Connecticut 06877, USA

Received 5 May 2005; published 10 August 2005

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.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.075503
DOI:
10.1103/PhysRevLett.95.075503
PACS:
61.43.Gt, 76.60.Pc, 83.85.Fg

*Electronic address: joga@waugh.cchem.berkeley.edu

†Present address: Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, CA 93106-9510, USA.

‡Electronic address: ysong@slb.com

 
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