CN111060862B - Two-dimensional gradient magnetic field system with adjustable included angle between magnetic field direction and gradient direction - Google Patents
Two-dimensional gradient magnetic field system with adjustable included angle between magnetic field direction and gradient direction Download PDFInfo
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- CN111060862B CN111060862B CN201911252666.5A CN201911252666A CN111060862B CN 111060862 B CN111060862 B CN 111060862B CN 201911252666 A CN201911252666 A CN 201911252666A CN 111060862 B CN111060862 B CN 111060862B
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Abstract
The invention discloses a two-dimensional gradient magnetic field system with an adjustable included angle between a magnetic field direction and a gradient direction, which comprises a current source, a longitudinal gradient coil and a transverse gradient coil; the magnetic field direction of the longitudinal gradient coil is the same as the magnetic field gradient direction, and the magnetic field direction of the transverse gradient coil is vertical to the magnetic field gradient direction; the longitudinal gradient coil and the transverse gradient coil are assembled and installed in a way that the gradient directions of the magnetic fields are the same and the magnetic field directions are orthogonal at 90 degrees, and the centers of the magnetic field working areas of the longitudinal gradient coil and the transverse gradient coil are overlapped; the longitudinal gradient coil and the transverse gradient coil are respectively supplied with power by a current source, and the direction of the synthetic magnetic field and the direction of the magnetic field gradient can be controlled by adjusting the magnitude and the direction of the current output by the two current sources to the gradient coil. The invention can realize the random adjustment of the gradient direction of the magnetic field in a two-dimensional space only by adjusting the size and the direction of the current passing through the coil.
Description
Technical Field
The invention belongs to the field of electromagnetic fields, and particularly relates to a two-dimensional gradient magnetic field system with an adjustable included angle between a magnetic field direction and a gradient direction.
Background
The gradient magnetic field system is used for generating a magnetic field with a linearly changing magnetic field magnitude in a working area, the magnetic field with the linearly changing magnetic field magnitude is called a gradient magnetic field, and the gradient magnetic field is mainly used for calibrating and testing equipment such as a gradient magnetic fuse, a gradient magnetometer, an atomic magnetometer, a magnetic tensor gradient instrument and the like, and generating a gradient magnetic field environment for medical and biological tests and the like.
The gradient magnetic field system generally comprises a current source and a gradient magnetic field coil, wherein the current source supplies power to the gradient magnetic field coil, and a gradient magnetic field can be generated in the central area of the gradient magnetic field coil. The conventional gradient magnetic field coil is generally formed by combining one or more pairs of coils, the direction of a magnetic field is parallel to the central axis of the coil, the magnetic field changes linearly along the central axis, that is, the direction of the magnetic field gradient is along the central axis. The magnitude of the magnetic field gradient can be controlled by adjusting the magnitude of the current, but the direction of the magnetic field and the direction of the magnetic field gradient cannot be changed, so that the direction of the magnetic field gradient is fixed relative to the relative orientation of the instrument equipment or the test article in the coil during the test, and if the magnetic field gradient is required to act on the instrument equipment or the test article in different orientations, the magnetic field gradient can only be controlled by rotating the orientation of the instrument equipment or the test article. This is a great inconvenience in the use of such a fixed gradient magnetic field apparatus for large test articles which are difficult to rotate, such as biological incubators, or instruments and equipment which require frequent changes in the direction of the magnetic field gradient.
Disclosure of Invention
In view of this, the invention provides a two-dimensional gradient magnetic field system with an adjustable included angle between a magnetic field direction and a gradient direction, which can realize the random adjustment of the magnetic field gradient direction in a two-dimensional space only by adjusting the magnitude and the direction of current passing through a coil.
The invention is realized by the following technical scheme:
a two-dimensional gradient magnetic field system with an adjustable included angle between a magnetic field direction and a gradient direction comprises a current source, a longitudinal gradient coil and a transverse gradient coil;
the magnetic field direction of the longitudinal gradient coil is the same as the magnetic field gradient direction, and the magnetic field direction of the transverse gradient coil is vertical to the magnetic field gradient direction; the longitudinal gradient coil and the transverse gradient coil are assembled and installed in a way that the gradient directions of the magnetic fields are the same and the magnetic field directions are orthogonal at 90 degrees, and the centers of the magnetic field working areas of the longitudinal gradient coil and the transverse gradient coil are overlapped; the longitudinal gradient coil and the transverse gradient coil are respectively supplied with power by a current source, and the direction of the synthetic magnetic field and the direction of the magnetic field gradient can be controlled by adjusting the magnitude and the direction of the current output by the two current sources to the gradient coil.
Furthermore, the longitudinal gradient coils are two groups of longitudinal combined coils, and the longitudinal combined coils comprise regular polygonal coils and circular coils; the two coils are nested and arranged in the same plane and are supplied with current in the same direction; the two groups of longitudinal combined coils are arranged in parallel and coaxially, and are electrified with currents in opposite directions.
Further, the regular polygon coil is a square coil.
Furthermore, the transverse gradient coils are two groups of transverse combined coils, each transverse combined coil comprises two rectangular coils, the two coils are oppositely arranged in parallel, the directions of magnetic fields are consistent, and current in the same direction is supplied; the other group of transverse combined coils are arranged at a certain distance along the direction vertical to the magnetic field, and the two groups of transverse combined coils are electrified with currents in opposite directions.
Further, the length-width ratio of the rectangular coil is (3-3.5): 1; the ratio of the center-to-center distance of the two groups of transverse combined coils to the length of the rectangular coil is (0.9-1.2): 1; the ratio of the distance between two rectangular coils in the same transverse combined coil to the length of the rectangular coils is (1.2-1.5): 1.
further, the number of winding turns in the two rectangular coils is the same.
Has the advantages that:
1. the invention adopts a longitudinal gradient coil and a transverse gradient coil, the directions of the two magnetic fields are orthogonal at 90 degrees, the direction of the synthetic magnetic field and the direction of the magnetic field gradient can be controlled by adjusting the magnitude and the direction of the output current to the two gradient coils, the arbitrary adjustment of the magnetic field gradient direction in a two-dimensional space can be realized without rotating a test device or rotating the gradient magnetic field coil, and the invention can calibrate instruments such as a gradient magnetometer, a gradient magnetic fuse and the like, and can also be applied to related tests in the aspect of biological magnetism.
2. The coil size parameters defined by the invention can ensure that the gradient magnetic field generated by the coil has good linearity and high accuracy, and the synthesized magnetic field is more accurate.
3. The two rectangular coils have the same winding turns, and the generated magnetic field has good linearity.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the direction of the current of the longitudinal gradient magnetic field coil winding and the coordinates of the axis system;
FIG. 3 is a schematic diagram of the direction of the current of the transverse gradient magnetic field coil winding and the coordinates of the axis system;
FIG. 4 is a magnetic field equipotential surface diagram;
wherein, 1-square coil I, 2-square coil II, 3-round coil I, 4-round coil II, 5-rectangle coil I, 6-rectangle coil II, 7-rectangle coil III, 8-rectangle coil IV.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The embodiment provides a two-dimensional gradient magnetic field system with an adjustable included angle between a magnetic field direction and a gradient direction, as shown in fig. 1, which includes a current source, a longitudinal gradient coil and a transverse gradient coil.
The magnetic field direction of the longitudinal gradient coil is the same as the magnetic field gradient direction, and the magnetic field direction of the transverse gradient coil is vertical to the magnetic field gradient direction; the longitudinal gradient coil and the transverse gradient coil are assembled and installed in a way that the gradient directions of the magnetic fields are the same and the magnetic field directions are orthogonal at 90 degrees, and the centers of the magnetic field working areas of the longitudinal gradient coil and the transverse gradient coil are overlapped; the longitudinal gradient coil and the transverse gradient coil are respectively supplied with power by a current source, and the direction of the synthetic magnetic field and the direction of the magnetic field gradient can be controlled by adjusting the magnitude and the direction of the current output by the two current sources to the gradient coil.
As shown in fig. 2, the longitudinal gradient coils are two sets of longitudinal combination coils, and the longitudinal combination coils include square coils and circular coils, wherein one set of longitudinal combination coils are square coils I1 and circular coils I3, and the other set of longitudinal combination coils are square coils II2 and circular coils II 4; the square coil I1 and the circular coil I3 are arranged in an outer square and inner circle nested mode and are positioned in the same plane, and current in the same direction is conducted; the square coil II2 and the circular coil II4 are also arranged in an external square and internal circle nested mode and are positioned in the same plane, and current in the same direction is conducted; the two groups of longitudinal combined coils are arranged in parallel and coaxially, and are electrified with currents in opposite directions. The same current is applied to the four coils of the square coil I1, the circular coil I3, the square coil II2 and the circular coil II4 in the direction indicated by the arrow in fig. 2 as the current direction, so that a magnetic field in the Y-axis direction of the coordinate system can be generated, and the magnitude of the magnetic field linearly changes along the Y-axis direction, as shown in fig. 4. As shown in table 1, the longitudinal gradient coil magnetic field magnitude and magnetic field direction.
TABLE 1 longitudinal gradient coil field magnitude and field direction
| Equipotential surface of |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Magnitude of magnetic field | 3B | 2B | B | 0 | -B | -2B | -3B |
| Direction of magnetic field | ← | ← | ← | / | → | → | → |
The side length of the winding of the square coil I1 and the square coil II2 is 2.8m, the center distance of the coil winding is 1.942m, the winding diameter of the circular coil I3 and the circular coil II4 is 1.037m, the winding distance is also 1.942m, and the gradient coil constant is 15 [ mu ] T/(A.m).
As shown in fig. 3, the transverse gradient coils are two sets of transverse combination coils, and the transverse combination coils include two rectangular coils, wherein one set of transverse combination coils is rectangular coil I5 and rectangular coil II6, and the other set of transverse combination coils is rectangular coil III7 and rectangular coil IV 8; the rectangular coil I5 and the rectangular coil II6 are oppositely arranged in parallel, the directions of the magnetic fields are consistent, and current in the same direction is supplied; the rectangular coil III7 and the rectangular coil IV8 are oppositely arranged in parallel, the directions of the magnetic fields are consistent, and current in the same direction is supplied; the transverse combined coil formed by the rectangular coil III7 and the rectangular coil IV8 and the transverse combined coil formed by the rectangular coil I5 and the rectangular coil II6 are installed at a certain distance in the direction perpendicular to the magnetic field, and the two groups of transverse combined coils are electrified with currents in opposite directions. The same current is applied to the rectangular coils I5, II6, III7 and IV8 in the direction indicated by the arrows in fig. 3 as the current direction, thereby generating a magnetic field in the Z-axis direction of the coordinate system, and the magnitude of the magnetic field changes linearly in the Y-axis direction, as shown in fig. 4. As shown in table 2, the transverse gradient coil magnetic field magnitude and magnetic field direction.
TABLE 2 transverse gradient coil field magnitude and field direction
| Equipotential surface of |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Magnitude of magnetic field | 3B | 2B | B | 0 | -B | -2B | -3B |
| Direction of magnetic field | ↑ | ↑ | ↑ | / | ↓ | ↓ | ↓ |
The dimensions of rectangular coil I5, rectangular coil II6, rectangular coil III7, and rectangular coil IV8 are all: the length b is 2.4m, the width a is 0.75m, the number of coil turns is 185 turns, the center-to-center distance c between the two groups of transverse combination coils is 2.55m, the distance d between two planes of the rectangular coil I5 and the rectangular coil II6 is 3.174m, and the gradient coil constant is 21.1 mu T/(A.m).
A two-dimensional gradient magnetic field system formed by the transverse gradient coil and the longitudinal gradient coil can generate a gradient magnetic field with the magnetic field direction being freely adjustable in an XOY plane and the gradient direction being the Y direction.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A two-dimensional gradient magnetic field system with an adjustable included angle between the magnetic field direction and the gradient direction is characterized in that the two-dimensional gradient magnetic field system comprises a current source, a longitudinal gradient coil and a transverse gradient coil;
the magnetic field direction of the longitudinal gradient coil is the same as the magnetic field gradient direction, and the magnetic field direction of the transverse gradient coil is vertical to the magnetic field gradient direction; the longitudinal gradient coil and the transverse gradient coil are assembled and installed in a way that the gradient directions of the magnetic fields are the same and the magnetic field directions are orthogonal at 90 degrees, and the centers of the magnetic field working areas of the longitudinal gradient coil and the transverse gradient coil are overlapped; the longitudinal gradient coil and the transverse gradient coil are respectively supplied with power by a current source, and the direction of the synthetic magnetic field and the direction of the magnetic field gradient can be controlled by adjusting the magnitude and the direction of the current output by the two current sources to the gradient coil;
the longitudinal gradient coils are two groups of longitudinal combined coils, and the longitudinal combined coils comprise regular polygonal coils and circular coils; the two coils are nested and arranged in the same plane and are supplied with current in the same direction; the two groups of longitudinal combined coils are arranged in parallel and coaxially, and are electrified with currents in opposite directions;
the transverse gradient coils are two groups of transverse combined coils, each transverse combined coil comprises two rectangular coils, the two coils are oppositely arranged in parallel, the magnetic field directions are consistent, and current in the same direction is supplied; the other group of transverse combined coils are arranged at intervals along the direction vertical to the magnetic field, and the two groups of transverse combined coils are electrified with currents in opposite directions; the length-width ratio of the rectangular coil is (3-3.5): 1; the ratio of the center-to-center distance of the two groups of transverse combined coils to the length of the rectangular coil is (0.9-1.2): 1; the ratio of the distance between two rectangular coils in the same transverse combined coil to the length of the rectangular coils is (1.2-1.5): 1.
2. the two-dimensional gradient magnetic field system of claim 1 wherein the regular polygon coil is a square coil.
3. The two-dimensional gradient magnetic field system with adjustable included angle between magnetic field direction and gradient direction of claim 1, wherein the number of winding turns in the two rectangular coils is the same.
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