NMR fringe magnetic field imaging experimental device

Abstract

The utility model relates to an experimental device for nuclear magnetic resonance edge magnetic field imaging, which relates to nuclear magnetic resonance imaging. Equipped with servo motor, voice coil motor, coarse adjustment non-magnetic lifting platform, fine adjustment non-magnetic lifting platform, nuclear magnetic resonance edge magnetic field imaging probe, sample chamber, probe coil and sample relative movement / stationary conversion pin, coarse adjustment and fine adjustment non-magnetic Lifting table grating ruler and control system; the control system is equipped with a host computer, PMAC controller, servo motor driver and voice coil motor controller. Combining the two-stage lifting high-precision mechanical structure of coarse adjustment and fine adjustment with advanced closed-loop control algorithm, it can realize the high-precision movement of the sample with the highest precision of 1 μm, and complete the high-precision and high-resolution nuclear magnetic resonance edge magnetic field imaging. Two experimental methods, namely, the relative moving imaging between the probe coil and the sample and the relatively static imaging between the probe coil and the sample, can be realized without any secondary modification on an experimental device, which ensures that the strong magnetic environment is not affected to the greatest extent; the closed-loop control makes the sample The more precise the displacement, the more accurate the result.

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...

AI Technical Summary

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 diffusion equipment: application to liquid crystals [J]. Magn. Reson. Chem, 2014, 52 (10): 640-648.) described a condition in the existing NMR equipment Under this condition, the method of improving the NMR fringe magnetic field imaging method by hand is extremely simple and 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 ofhydration and evaporation during the drying of a cement paste by local-izedNMR, Cem.Concr .Res.48(2013)86–96.) and Joel A.Tang et al. 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 has also achieved the desired effect, but it is not suitable for small samples and high Precision High Resolution Imaging

Images