CN-122025342-A - Magnetic shielding barrel gradient magnetic field compensation device

CN122025342ACN 122025342 ACN122025342 ACN 122025342ACN-122025342-A

Abstract

The invention provides a magnetic shielding barrel gradient magnetic field compensation device which comprises a plurality of magnetic compensation units, wherein the magnetic compensation units are manufactured in a non-magnetization design, the whole magnetic compensation unit is a flexible PCB, the magnetic compensation units are provided with radial compensation surfaces and axial compensation surfaces, the radial compensation surfaces of the magnetic compensation units are connected, so that gradient compensation of a radial magnetic field of a magnetic shielding barrel can be completed, and the axial compensation surfaces of the magnetic compensation units are connected, so that gradient compensation of an axial magnetic field of the magnetic shielding barrel can be completed. By applying the technical scheme of the invention, the technical problems that when the existing magnetic shielding barrel has new functional requirements, such as adding radial space gradient compensation or expanding space uniformity area, a new coil skeleton is required to be designed and put into production, the time consumption is long, and when the production and processing precision is limited, the space uniformity of a coil magnetic field is limited and cannot be corrected are solved.

Inventors

QIN JIE
DONG SHICHAO
WAN SHUANGAI
GUO YUHAO
ZUO YULONG
HUANG JIONG

Assignees

北京自动化控制设备研究所

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (5)

1. The magnetic shielding barrel gradient magnetic field compensation device is characterized by comprising a plurality of magnetic compensation units, wherein the magnetic compensation units are manufactured in a non-magnetization design, and the whole magnetic compensation unit is a flexible PCB and is provided with a radial compensation surface and an axial compensation surface; the axial compensation surfaces of the magnetic compensation units are connected, so that gradient compensation of the axial magnetic field of the magnetic shielding barrel can be completed.
2. The gradient magnetic field compensation device of the magnetic shielding barrel according to claim 1, wherein the magnetic compensation unit is made of nonmagnetic copper and resin plastic foil, the welding point is a brazing point, the whole magnetic shielding barrel is of a flexible structure, the magnetic shielding barrel can be well attached to the curved inner diameter of the magnetic shielding barrel, and the magnetic shielding barrel does not occupy extra space.
3. The gradient magnetic field compensation device of the magnetic shielding barrel according to claim 2, wherein a first circuit, a second circuit, a first welding spot, a second welding spot, a third welding spot and a fourth welding spot exist on a radial compensation surface of the magnetic compensation unit, the first circuit and the second circuit have opposite current flow directions and comprise a straight wiring position and a curve wiring position, the first circuit and the straight wiring position of the second circuit form magnetic field cancellation, no extra magnetic field interference is generated, the curve wiring position forms a single basic coil to form a magnetic field unit, the first welding spot is positioned at one end of the first circuit, the second welding spot is positioned at the other end of the first circuit, the fourth welding spot is positioned at one end of the second circuit, the third welding spot is positioned at the other end of the second circuit, when the radial compensation surface of the magnetic compensation unit is connected, the second welding spots and the third welding spots of the adjacent magnetic compensation units are connected through the first welding spots and the fourth welding spots, and the second welding spots of the magnetic compensation unit positioned at the edge are shorted to form a closed loop.
4. The gradient magnetic field compensation device of the magnetic shielding barrel according to claim 3, wherein a line three, a first branch, a second branch, a welding point five, a welding point six, a welding point seven, a welding point eight, a welding point nine and a welding point ten are arranged on the axial compensation surface of the magnetic compensation unit, the welding point five is positioned at one end of the line three, the welding point six is positioned at the other end of the line three, the welding point seven is positioned at one end of the first branch, the welding point eight is positioned at the other end of the first branch, the welding point ten is positioned at one end of the second branch, the welding point nine is positioned at the other end of the second branch, the adjacent magnetic compensation units are connected with the line three through the welding point five and the welding point six, and the line three is conducted, and the welding point five, the welding point eight, the welding point nine and the welding point ten are arranged along the inner wall of the magnetic shielding barrel, so that a single axial coil can be formed, and the first branch, the second branch, the welding point eight, the welding point nine and the welding point ten are used for axially compensating the face to the outer lead.
5. The gradient magnetic field compensation device of the magnetic shielding barrel according to claim 4, wherein when the radial compensation surfaces of the magnetic compensation units are combined, two groups of coil arrays can be formed on the left wall and the right wall or the upper wall and the lower wall of the magnetic shielding barrel respectively, the radial gradient compensation of the magnetic shielding barrel can be realized through designing and arranging asymmetric coil groups, the coil arrays can be subjected to multilayer stacking design based on the characteristic of lightening and thinning of the magnetic compensation units, the magnetic gradient compensation effect is improved or inhibited, when the axial compensation surfaces of the magnetic compensation units are combined, a plurality of groups of axial coils can be formed on the inner wall of the magnetic shielding barrel, the axial gradient compensation of a magnetic field is completed, and when the axial gradient compensation of the magnetic field is combined, the multilayer stacking can be performed, so that the required compensation effect is achieved.

Description

Magnetic shielding barrel gradient magnetic field compensation device Technical Field The invention relates to the technical field of magnetic shielding barrels, in particular to a gradient magnetic field compensation device of a magnetic shielding barrel. Background Magnetic fields are an important component in physics, and measurement of magnetic fields is always one of important research directions in the field of precision measurement, wherein a high-performance magnetic shielding barrel provides conditions for basic testing of magnetic fields. Among the performance indexes of the magnetic shielding barrel, the uniform distribution range of the space magnetic field is an important index for the use of the magnetic shielding barrel. Good magnetic field uniformity is not separated from spatial magnetic field gradient compensation. The spatial magnetic field gradient compensation at the present stage is basically limited by a preset coil framework, and the inside of the coil framework is grooved and tightly wound with wires so as to generate a main magnetic field and a compensation magnetic field. However, the coil framework design cannot be changed basically after being determined, when the magnetic field environment in the magnetic shielding barrel has optimization requirements, the coil framework cannot meet the requirements of timely modification, the coil framework can be redesigned to replace the coil framework, the process is long in time consumption, and the result is easily affected by the processing process. When the machining precision is different, the gradient compensation effect of the space magnetic field is limited, and the space magnetic field is difficult to adjust. If a new type of coil is introduced into the magnetic shielding barrel, such as a triaxial Helmholtz coil, the new coil structure can limit the use range of the space in the magnetic shielding barrel, and the use difficulty of the magnetic shielding barrel is increased. Disclosure of Invention The invention provides a gradient magnetic field compensation device of a magnetic shielding barrel, which can solve the technical problems that when the magnetic shielding barrel has new functional requirements, such as increasing radial space gradient compensation or expanding space uniformity area, a new coil skeleton is required to be designed and put into production, the time consumption is long, and when the production and processing precision is limited, the space uniformity of the coil magnetic field is limited and cannot be corrected. According to one aspect of the invention, the magnetic shielding barrel gradient magnetic field compensation device comprises a plurality of magnetic compensation units, wherein the magnetic compensation units are manufactured in a non-magnetization design, the whole magnetic compensation unit is a flexible PCB, the magnetic compensation units are provided with radial compensation surfaces and axial compensation surfaces, the radial compensation surfaces of the magnetic compensation units are connected, gradient compensation of the radial magnetic field of the magnetic shielding barrel can be completed, and the axial compensation surfaces of the magnetic compensation units are connected, and gradient compensation of the axial magnetic field of the magnetic shielding barrel can be completed. Further, the magnetic compensation unit is made of nonmagnetic copper, plastic, resin and the like, the welding spots are brazing spots, the whole magnetic compensation unit is of a flexible structure, the magnetic compensation unit can be well attached to the curved surface inner diameter of the magnetic shielding barrel, and the magnetic compensation unit does not occupy extra space in the magnetic shielding barrel. Further, a first circuit, a second circuit, a welding spot, a second welding spot, a third welding spot and a fourth welding spot exist on the radial compensation surface of the magnetic compensation unit, the current flow directions in the first circuit and the second circuit are opposite, the magnetic compensation unit comprises a straight line position and a curve line position, the straight line position of the first circuit and the straight line position of the second circuit form magnetic field cancellation, no extra magnetic field interference is generated, the curve line position forms a single basic coil to form a magnetic field unit, the first welding spot is positioned at one end of the first circuit, the second welding spot is positioned at the other end of the first circuit, the fourth welding spot is positioned at one end of the second circuit, the third welding spot is positioned at the other end of the second circuit, when the radial compensation surface of the magnetic compensation unit is connected, the first welding spot and the fourth welding spot of the adjacent magnetic compensation unit are connected in a welding mode to form conduction, and the second welding spot and the th