Nuclear magnetic resonance fringe magnetic field imaging experimental device

Abstract

A nuclear magnetic resonance (NMR) fringe magnetic field imaging experimental device relates to NMR imaging. The device comprises a servo motor, a voice coil motor, a coarse adjustment non-magnetic lifting platform, a fine adjustment non-magnetic lifting platform, a NMR fringe magnetic field imaging probe, a sample chamber, a probe coil and sample relative-mobile / static conversion pin, a coarse adjustment and fine adjustment non-magnetic lifting platform grating ruler, and a control system. The control system is composed of a principal computer, a PMAC controller, a servo motor driver, and a voice coil motor controller. A coarse adjustment and fine adjustment two-stage lifting high-precision mechanical structure and an advanced closed-loop control algorithm are combined to realize high-precision sample movement with the highest precision of 1micron and complete high-precision and high-resolution NMR fringe magnetic field imaging. Two experimental methods, namely, probe coil and sample relative-mobile imaging and probe coil and sample relative-static imaging, can be completed on one experimental device without the need for any secondary transformation, and that a strong magnetic environment is not affected is guaranteed to the maximum. Closed-loop control makes sample displacement more precise and the result more accurate.

Description

technical field [0001] The invention relates to nuclear magnetic resonance imaging, in particular to a nuclear magnetic resonance edge magnetic field imaging experimental device. Background technique [0002] Traditional nuclear magnetic resonance imaging technology has developed quite maturely today, but whether traditional nuclear magnetic resonance imaging technology is used in medicine or other fields, most of it is aimed at imaging liquid samples. Including the current research in the academic field, a large part of it is still based on liquid MRI. However, due to the strong coupling between spins and the wide resonance spectrum of solid samples, other fine spectral line structures are covered up, the transverse relaxation time is extremely short, and the signal is not easy to collect. Therefore, compared with liquid imaging, solid imaging is more convenient. Difficult. [0003] Although solid-state magnetic resonance imaging started late in the international research...

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Problems solved by technology

In the international arena, there are no publicly available examples of related patents on the experimental equipment of nuclear magnetic resonance fringe magnetic field imaging technology; in terms of international research papers, the experimental devices involved in nuclear magnetic resonance fringe magnetic field imaging technology have their own characteristics: M. Ciffelli (Cifelli M.A practical tutorial to set up NMR diffusionometry equipment: application to liquid crystals [J]. Magn. Reson. Chem, 2014, 52(10): 640-648.) described a method in existing NMR equipment Under certain conditions, it is extremely simple to manually improve the method of NMR fringe magnetic field imaging, which has achieved the expected effect, but there will always be some errors in the manual adjustment of the experimental equipment, which is not suitable for high-precision and high-resolution imaging; Maxime Van Landeghem et al. (M.Van Landeghem, J.-B.d'Espinose de Lacaillerie, B.Blümich, J.P.Korb, B.Bresson, The roles of hydration and evaporation during the drying of a cement paste by local-ized NMR, Cem.Concr.Res.48(2013)86–96.) and Joel A.Tang et al. (J.A.Tang, G.M.Zhong, S.Dugar, J.A.Kitchen, Y.Yang, R.Q.Fu, Solid-state STRAFI NMR probe for material imaging of quadrupolar nuclei, J.Magn.Reson.225(2012)93–101.) The method of placing a stepper motor outside the 5 Gauss line to drive the sample to move with low precision also achieved the desired effect, but it is not applicable High precision and high resolution imaging for small samples

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