Permanent magnet device used for nuclear magnetic resonance probe

Abstract

The invention relates to the technical field of nuclear magnetic resonance, in particular to a permanent magnet device used for a nuclear magnetic resonance probe. The permanent magnet device comprises a columnar permanent magnet and a cone-shaped permanent magnet, wherein a columnar cavity is formed in the middle part of the columnar permanent magnet; a cone-shaped cavity is formed in the middle part of the cone-shaped permanent magnet, the bottom surface of the cone-shaped permanent magnet and the axial cross section of the columnar permanent magnet are same in shapes and equal in sizes, and one end face of the columnar permanent magnet is coaxially connected with the bottom surface of the cone-shaped permanent magnet so as to communicate the columnar cavity with the cone-shaped cavity. The permanent magnet device is more reasonable in structure, a homogeneous magnetic field region is deviated from the center of the columnar permanent magnet to the direction of the cone-shaped permanent magnet, so that the space utilization rate of the magnetic field is obviously improved, the size of the magnet is effectively reduced, and the weight of the magnet is reduced. The permanent magnet device overcomes the disadvantages that a pole plate type magnet is huge and heavy and the leakage flux of a pencil-shaped permanent magnet formed through connection and combination of the columnar permanent magnet and the cone-shaped permanent magnet is extremely low, so that the utilization rate of magnetic energy is high, the using amount of ferromagnetic material is reduced, and meanwhile the homogeneity of the magnetic field inside the hollow cavity is improved.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance, in particular to a permanent magnet device for a nuclear magnetic resonance probe. Background technique [0002] In recent years, the field of nuclear magnetic resonance equipment has achieved continuous development, and many important application directions have been proposed and realized continuously. [0003] The current method for measuring drilled core samples is to first obtain cores through field drilling, and then bring the cores back to a laboratory that requires a higher measurement environment for measurement. The disadvantage of this method is that it takes too long from the acquisition of the core to the completion of the measurement, so that the obtained analysis results cannot be effectively used to guide on-site exploration and development due to their poor timeliness. Therefore, it is of practical significance to quickly obtain the physical and chemical proper...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to solve the problem that the permanent magnet of the existing nuclear magnetic resonance instrument cannot provide suitable magnetic field strength and uniformity, and the size and weight of the whole equipment are relatively large, which causes inconvenience to the measurement of the sample in the test tube

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