Permanent magnet for portable nuclear magnetic resonance instrument
A kind of nuclear magnetic resonance and permanent magnet technology, applied in instruments, measuring magnetic variables, measuring devices, etc., can solve the problems of large magnets, difficult to increase magnetic field strength, cumbersome and other problems, and achieve high magnetic field space utilization, simple manufacturing process, and overall volume. small effect
Inactive Publication Date: 2006-12-27
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology
This is one of the fundamental reasons for the high cost of magnets
[0007] (2) It is difficult to increase the magnetic field strength
This not only increases the cost of the instrument, but also makes the magnet bulky and heavy, which is not conducive to carrying
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[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0043] figure 1 It is a structural schematic diagram of a specific embodiment of the present invention composed of 13 magnets. Such as figure 1 As shown, the permanent magnets Y1, Y2, Y3, Y4, Y5, Y6, Y7, and Y8 with a sector-shaped axial section form a hollow cylindrical permanent magnet; the sector-shaped permanent magnets B1, B2, B3, B4, and B5 form a semi-cylindrical permanent magnet . The direction of the magnetic field in the cylindrical permanent magnet is the same as the direction of the axial magnetic field in the semi-cylindrical permanent magnet. One end face of the cylindrical permanent magnet is superimposed on the shaft section of the semi-cylindrical permanent magnet to form a test tube magnet.
[0044] figure 2 It is a schematic diagram of the axial compensation of the cylindrical permanent magnet of the present invention. ...
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The invention relates to a permanent magnet used in portable nuclear magnetic resonance instrument, which is formed by one hollow cylinder permanent magnet and one semi-cylinder permanent magnet, wherein the axial section of semi-cylinder permanent magnet is layered on one end surface of cylinder permanent magnet; the hollow cylinder permanent magnet is formed by arc permanent magnets with same shape, same magnetic field strength, and the magnetization direction two times of magnet rotation direction; the semi-cylinder permanent magnet is made by using the plane axially parallel with magnetic field direction to cut the cylinder permanent magnet same as the hollow cylinder permanent magnet; the inner and outer radiuses of semi-cylinder permanent magnet are the same as the inner and outer radiuses of cylinder permanent magnet, while its axial length is longer then the outer diameter of cylinder permanent magnet; the axial section of semi-cylinder permanent magnet is layered on one end surface of cylinder permanent magnet, while their magnetic field directions along the axle of cylinder chamber are same, to compensate the axial magnetic field at the end of cylinder permanent magnet.
Description
technical field [0001] The invention relates to a permanent magnet for a nuclear magnetic resonance instrument, in particular to a permanent magnet for a static magnetic field generator for a portable nuclear magnetic resonance instrument. 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 effectiveness. Therefore, it is of practical si...
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IPC IPC(8): G01R33/383
Inventor 陈继忠张一鸣
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI