Fixed-gradient NMR (nuclear magnetic resonance) magnet

Abstract

The invention relates to a fixed-gradient NMR (nuclear magnetic resonance) magnet and provides an NMR magnet system applied to non-uniform field NMR techniques. The system is capable of generating a fixed-gradient magnetic field in a measurement area; the fixed-gradient magnetic field is available for NMR two-dimensional imaging of liquid and solid samples. The system comprises four yokes made of pure iron, four pieces of rare-earth magnetic material, and two all-iron gradient plates. The four pieces of rare-earth magnetic material are placed in the yokes, every two of polarization directions of the four pieces of rare-earth magnetic material form two magnetic circuits; a more uniform measurement magnetic field is generated in the center of the system. The gradient plates are placed right over and under the measurement area; a uniformly decreasing one-dimensional gradient is generated in the measurement area.

Description

technical field [0001] The invention relates to the magnet system component structure of the nuclear magnetic resonance analyzer. Background technique [0002] The nuclear magnetic resonance analyzer can make the tested sample undergo nuclear magnetic resonance phenomenon, and analyze the material composition, internal structure and properties of the tested sample by obtaining the nuclear magnetic resonance signal of the tested sample. [0003] The NMR instrument is mainly divided into three parts: the magnet system, the spectrometer system and the computer part. The magnet system is a very important core part, which consists of main magnet, gradient coil and radio frequency coil. The magnet system provides a polarizing magnetic field, a spatially encoding gradient magnetic field, and an RF collar that generates an RF field. The spectrometer part controls the radio frequency transmitter and receiver, generates and executes pulse sequences, and receives nuclear magnetic res...

AI Technical Summary

Problems solved by technology

However, gradient coils have disadvantages such as generating eddy currents, not being stable enough, and increasing the complexity of the instrument.

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