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Dec 1999

Volume 70, Issue 12, pp. 4457-4738

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Quick measurement of nuclear magnetic resonance coil sensitivity with a single-loop probe

Jean-Christophe Ginefri, Emmanuel Durand, and Luc Darrasse

Rev. Sci. Instrum. 70, 4730 (1999); http://dx.doi.org/10.1063/1.1150142 (2 pages) | Cited 11 times

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The coil sensitivity for nuclear magnetic resonance (NMR) signal detection can be defined as B1/math, which represents the magnetic field that the coil induces per unit supplied power. An inductive probe was previously proposed to quickly evaluate the sensitivity of a tuned NMR coil. As this probe uses two loops, decoupled by means of a slight overlapping, it is not applicable to small NMR coils since the decoupling efficiency is limited by the loop dimensions. We present a new method, derived from the former, which uses a single-loop probe and allows accurate sensitivity mapping even for very small NMR coils. This new method proves to be in good agreement with both the theoretical formula and a reference method for assessing a simple coil’s sensitivity. We conclude that it is both reliable and particularly convenient for development and optimization of small coils for surface MR imaging. © 1999 American Institute of Physics.
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07.57.Pt Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques
84.32.Hh Inductors and coils; wiring
87.61.Ff Instrumentation

Computer-controlled Teflon flow control valve

R. S. Gao, R. J. McLaughlin, M. E. Schein, J. A. Neuman, S. J. Ciciora, J. C. Holecek, and D. W. Fahey

Rev. Sci. Instrum. 70, 4732 (1999); http://dx.doi.org/10.1063/1.1150137 (2 pages) | Cited 1 time

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A butterfly vane valve is described for the servo control of a gas or liquid flow. The valve is suitable for reactive species since nearly all wetted parts are Teflon. The valve is operated by a servo motor that is controlled by a dedicated microprocessor programmed in BASIC. The valve offers many other desirable features, including constant and relatively small surface area, low dead volume, high conductance in the full-open position, vacuum compatibility, firmware control, and scalability. © 1999 American Institute of Physics.
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47.85.L- Flow control
07.07.Tw Servo and control equipment; robots
84.50.+d Electric motors
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