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Device and method for Halbach magnet magnetic field uniformity adjustment

A technology of magnetic field uniformity and magnets, which is applied in the field of Halbach magnet magnetic field uniformity adjustment devices, to achieve the effect of improving magnetic field uniformity and compensating for performance degradation.

Inactive Publication Date: 2019-09-20
SOUTHEAST UNIV +1
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a device and method for adjusting the uniformity of the magnetic field of a Halbach magnet, which can quickly and effectively measure the current The magnetic field distribution of the magnet and the improvement of the uniformity of the magnetic field help researchers to compensate for the performance degradation caused by the processing error of the magnet

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  • Device and method for Halbach magnet magnetic field uniformity adjustment
  • Device and method for Halbach magnet magnetic field uniformity adjustment
  • Device and method for Halbach magnet magnetic field uniformity adjustment

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0032] Such as figure 1 with Figure 4 As shown, a device and method for adjusting the uniformity of the magnetic field of a Halbach magnet includes a shimming structure and a field probe, and the shimming structure includes an angled dial 101, an adjustment rod 102, a fixed The structure 103 and the shimming small magnetic sheet 202.

[0033] Such as figure 2 As shown, the fixed structure is composed of four aluminum alloy sector parts 203 with blind holes and boron nitride ceramic parts. The boron nitride ceramic parts include small-diameter boron nitride ceramic bushings 201 and large-diameter The boron ceramic bushing 204, the blind hole 302 in the aluminum alloy sector 203 is used to accommodate the shimming small magnetic piece 202, and the shimming small magnetic piece 202 adopts samarium whose residual magnetic s...

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Abstract

The invention discloses a device and method for Halbach magnet magnetic field uniformity adjustment. The device comprises a shimming structure and a field measuring probe; the shimming structure comprises small shimming magnetic sheets, an angle controller and a magnetic sheet fixing structure; the fixing structure is composed of four aluminum alloy sector pieces with blind holes and a boron nitride ceramic piece; the angle controller is composed of an angle graduated disc and an adjusting rod; the field measuring probe comprises a rotary positioning structure and one magnetometer; and the magnetometer is composed of a solenoid coil, a 1 mm test tube and a tuning matching box. With the method adopted, the problem that the actual value of the magnetic field uniformity of the Halbach magnet is far higher than a theoretical value, which is caused by magnet machining and positioning errors, can be solved; and the excellent magnetic field uniformity of the Halbach magnet for low-field nuclear magnetic resonance can be realized with the miniaturization of the Halbach magnet realized.

Description

technical field [0001] The invention relates to the fields of performance characterization, magnetic field control and the like of permanent magnets, in particular to a device and method for adjusting the uniformity of the magnetic field of a Halbach magnet. Background technique [0002] With the improvement and popularization of desktop nuclear magnetic resonance instruments, low-field nuclear magnetic resonance technology is developing towards portability and low cost, which is conducive to the rapid detection of material science, process and quality control, biology, environmental science and medicine. Compared with other types of magnets, Halbach magnets have excellent magnetic field performance. They can generate the largest magnetic field strength with the smallest volume. The field uniformity is theoretically higher than that of other existing types of magnets. They have great prospects in portable nuclear magnetic resonance instruments. However, due to processing tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/3873
CPCG01R33/3873
Inventor 陆荣生杨晴胡剑雄臧波
Owner SOUTHEAST UNIV
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