CN116430280B - Gradient magnetic field measuring device - Google Patents
Gradient magnetic field measuring device Download PDFInfo
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- CN116430280B CN116430280B CN202310701986.4A CN202310701986A CN116430280B CN 116430280 B CN116430280 B CN 116430280B CN 202310701986 A CN202310701986 A CN 202310701986A CN 116430280 B CN116430280 B CN 116430280B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/022—Measuring gradient
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The application discloses a gradient magnetic field measuring device, which comprises a magnetic field measuring sensor, an upper computer electrically connected with the magnetic field measuring sensor and a three-dimensional moving platform for moving the magnetic field measuring sensor, wherein the three-dimensional moving platform comprises: the central shaft is axially arranged in the gradient coil through the supporting device; the radial moving assembly is arranged on the magnetic field measuring sensor, and the radial moving assembly can enable the magnetic field measuring sensor to move in the gradient coil; an axial movement assembly that can axially move the magnetic field measurement sensor within the gradient coil; and a circumferential rotation assembly that can circumferentially rotate the magnetic field measurement sensor within the gradient coil. The gradient magnetic field measuring device provided by the application can realize that the magnetic field measuring sensor can move randomly in the gradient coil and can move to any position in the gradient magnetic field coordinate system, so that the measurement of the gradient magnetic field in any region is completed.
Description
Technical Field
The application relates to the technical field of nuclear magnetic resonance equipment, in particular to a gradient magnetic field measuring device.
Background
Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) as a non-invasive detection means, has taken an important role in research of living organisms, modern medical diagnosis, physicochemical and material science due to the remarkable characteristic of high contrast of soft tissues. The performance of the gradient magnetic field generated by the gradient coil in the magnetic resonance imaging device determines the image quality of the magnetic resonance imaging, the gradient magnetic field is controllable magnetic field distribution which is linearly changed in a certain space range and the linearity of the gradient magnetic field is related to the distortion degree of the magnetic resonance image. Therefore, whether the gradient magnetic field generated by the gradient coil after being electrified meets the design requirement or not needs to be measured and evaluated, and the performance such as the efficiency and the magnetic field linearity of the gradient coil can be tested by measuring the gradient magnetic field.
Existing gradient magnetic field measurement devices typically include a three-dimensional mobile platform, a Gaussian gauge, and a computer. The three-dimensional moving platform is used for supporting the Gaussian probe to move in a three-dimensional space so as to measure the magnetic field intensity at different sampling points, the current three-dimensional moving platform is usually designed and manufactured aiming at a fixed target area of a certain magnet, and a measuring mode of fixed discrete sampling points is mostly adopted, so that the three-dimensional moving platform can only be used for measuring a gradient magnetic field of a certain fixed target area and cannot be used for measuring gradient magnetic fields in other areas of the magnetic field.
Therefore, how to provide a gradient magnetic field measuring device to measure the gradient magnetic field in any area is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a gradient magnetic field measuring device, which can enable a magnetic field measuring sensor to be positioned at any position in a gradient magnetic field coordinate system so as to finish the measurement of a gradient magnetic field in any region.
In order to achieve the above object, the present application provides a gradient magnetic field measurement device, which includes a magnetic field measurement sensor, an upper computer electrically connected with the magnetic field measurement sensor, and a three-dimensional moving platform for moving the magnetic field measurement sensor, wherein the magnetic field measurement sensor and the three-dimensional moving platform are both disposed in a gradient coil, and the three-dimensional moving platform includes:
the central shaft is axially arranged in the gradient coil through the supporting device;
the radial moving assembly is arranged at the end part of the central shaft, the magnetic field measuring sensor is arranged on the radial moving assembly, and the radial moving assembly can enable the magnetic field measuring sensor to move radially in the gradient coil;
the axial moving assembly is arranged on the supporting device, the central shaft can axially move in the gradient coil, and the magnetic field measuring sensor can axially move in the gradient coil due to the axial movement of the central shaft;
the circumferential rotating assembly is arranged on the supporting device, the central shaft can rotate in the inner circumferential direction of the gradient coil through the circumferential rotating assembly, and the magnetic field measuring sensor can rotate in the inner circumferential direction of the gradient coil through the circumferential rotating of the central shaft.
The utility model provides a gradient magnetic field measuring device, strutting arrangement includes two supporting plates, and the disc has all been set firmly to the inboard of two supporting plates, and two supporting plates and two discs all are equipped with the centre bore that runs through, and be located same axis, and the centre bore supplies to be used for the center pin to alternate so that the center pin sets up in the gradient coil axial, and the outer peripheral face of two supporting plates all symmetry is provided with the hand screw.
The utility model provides a gradient magnetic field measuring device, axial moving component and circumference rotating component all locate on same supporting disk, circumference rotating component is including locating the first hollow disc in the disc outside, locate the second hollow disc in the supporting disk outside and laminating be located the first hollow cylinder in the centre bore, first hollow disc and second hollow disc are connected respectively at first hollow cylinder's both ends, first hollow disc, second hollow disc and first hollow cylinder all are equipped with and run through, and lie in the first jack of wearing on same axis, first jack of wearing supplies to be used for installing axial moving component, axial moving component supplies to be used for the center pin axial to alternate the setting, be provided with circumference rotation handle on the second hollow disc, be provided with the locating part on the first hollow disc, and the extension of locating part is located the sliding tray of center pin, can make the center pin circumference rotatory in the gradient coil through rotating circumference rotation handle.
A first threaded hole penetrating through is formed in the second hollow disc, the circumferential rotary handle is arranged in the first threaded hole, external threads are formed in the outer peripheral surface of the circumferential rotary handle, rotation angle scales are marked on the edge of the supporting disc, and a starting line is marked on the second hollow disc.
The utility model provides a gradient magnetic field measuring device, axial displacement subassembly is including locating the third hollow disc in the first hollow disc outside, locate the fourth hollow disc in the second hollow disc outside and laminating be located the second hollow cylinder in the first jack that wears, third hollow disc and fourth hollow disc are connected respectively at the both ends of second hollow cylinder, third hollow disc, fourth hollow disc and second hollow cylinder all are equipped with and run through, and lie in the second jack that wears on same axis, the second is worn the jack and is used for the center pin axial to alternate, the second of second hollow cylinder is worn the hole and is equipped with the internal thread with center pin external screw thread complex, be provided with the second screw hole that runs through on the fourth hollow disc, the second screw hole is used for installing axial displacement handle, axial displacement handle outer peripheral face is equipped with the external screw thread, second hollow disc edge mark has axial displacement scale, the fourth hollow disc mark has the initial line.
The utility model provides a gradient magnetic field measuring device, radial remove the tip that the subassembly located the center pin through micromatic setting, micromatic setting includes the axial fine setting subassembly that radial fine setting subassembly and radial fine setting subassembly are connected, and radial remove the subassembly and install on the axial fine setting subassembly.
The utility model provides a gradient magnetic field measuring device, radial fine setting subassembly includes first backup pad and second backup pad, first backup pad and second backup pad are about center pin symmetry setting, and first backup pad and second backup pad pass through third backup pad and fourth backup pad fixed connection, the inner wall of first backup pad and second backup pad all is provided with L type recess, L type recess is including vertical groove and the horizontal groove of mutual intercommunication, first slider has set firmly to the tip of center pin, first slider can radially slide in two vertical inslot, first slider is provided with the third screw hole that radially runs through, third backup pad is provided with the first through-hole that radially runs through, first through-hole and third screw hole are located same axis, and communicate each other, first through-hole interlude is provided with radial fine setting axle, radial fine setting is epaxial to be provided with radial fine setting knob and radial fine setting limiting plate, radial fine setting knob laminating is located the upper surface of third backup pad, radial fine setting limiting plate laminating is located the lower surface of third backup pad, radial fine setting axle's lower extreme is provided with the external screw thread, so that radial fine setting axle and first screw thread slider are connected.
The utility model provides a gradient magnetic field measuring device, axial fine setting subassembly is including supplying the second slider that is used for installing radial moving assembly, the second slider can be in two horizontal slots axial slip, the second slider is provided with the fourth screw hole that runs through axially, the fourth backup pad is provided with the second through-hole that runs through axially, the second through-hole is located same axis with the fourth screw hole, and it is provided with axial fine setting axle to alternate in the second through-hole, be provided with axial fine setting knob and axial fine setting limiting plate on the axial fine setting axle, axial fine setting knob laminating is located the outside of fourth backup pad, axial fine setting limiting plate laminating is located the inboard of fourth backup pad, axial fine setting axle's extension is provided with the external screw thread, so that axial fine setting axle and second slider threaded connection.
The utility model provides a gradient magnetic field measuring device, radial movement subassembly includes fixed connection's fifth backup pad, sixth backup pad, seventh backup pad and support disc, fifth backup pad and sixth backup pad set up relatively and lie in the inboard of first backup pad and second backup pad, seventh backup pad and support disc are all fixed to be located between fifth backup pad and the sixth backup pad, the outer wall and the second slider fixed connection of seventh backup pad support disc are provided with the third through-hole that runs through axially, the inboard of fifth backup pad is provided with slidable radial movement rack, the upper end of radial movement rack is provided with the sensor support, the sensor support is used for installing magnetic field measurement sensor, radially slide in fifth backup pad through radial movement rack, and then realize that magnetic field measurement sensor radially removes in the gradient coil.
The utility model provides a gradient magnetic field measuring device, the inner wall of fifth backup pad is provided with the guide rail, the dorsal part of radial movement rack is provided with the draw-in groove with guide rail complex, so that radial movement rack can radially slide on the guide rail, the interlude of third through hole is provided with the gear shaft, the one end of gear shaft is provided with the gear with radial movement rack meshing, radial movement dish is connected to the other end of gear shaft, radial movement dish laminating is located the outside of supporting disk, and radial movement dish is provided with the fifth screw hole that the axial runs through, the fifth screw hole supplies to be used for installing radial movement handle, supporting disk edge mark has radial movement scale, the last mark of radial movement dish has the initial line.
For the background technology, the central shaft is arranged in the gradient coil through the supporting device, one end of the central shaft is provided with the radial moving component for installing the magnetic field measuring sensor, the radial moving component can enable the magnetic field measuring sensor to move radially in the gradient coil, the axial moving component and the circumferential rotating component which are arranged on the supporting device can enable the central shaft to move axially and rotate circumferentially in the gradient coil, and the magnetic field measuring sensor is connected with the central shaft through the radial moving component, so that the magnetic field measuring sensor can move axially and rotate circumferentially in the gradient coil, namely, the magnetic field measuring sensor can move randomly in the gradient coil and can move to any position in a gradient magnetic field coordinate system, and the measurement of the gradient magnetic field in any region is completed.
The gradient magnetic field measuring device provided by the application has the advantages of reasonable structural design, simplicity in operation and high measuring precision, the operation complexity of the measuring device is obviously reduced, and the measuring efficiency of the gradient magnetic field generated by the gradient coil is improved.
Drawings
FIG. 1 is a schematic view of the axial left side of a gradient magnetic field measuring device according to an embodiment of the present application;
FIG. 2 is a schematic view of the right side of the structural axis of the gradient magnetic field measuring device according to the embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a structure of a gradient magnetic field measurement apparatus according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a gradient magnetic field measurement apparatus according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a gradient magnetic field measurement apparatus according to an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating a schematic diagram of a gradient magnetic field measurement apparatus according to an embodiment of the present application;
FIG. 7 is a schematic view of a cross-sectional perspective view of the direction A-A of FIG. 6;
FIG. 8 is a schematic view showing a cross-sectional perspective structure in the B-B direction of FIG. 6;
fig. 9 is a schematic view of a C-C direction cross-sectional perspective structure of fig. 6.
Wherein:
a 1-magnetic field measuring sensor, a 2-central shaft, a 3-supporting device, a 4-radial moving assembly, a 5-axial moving assembly, a 6-circumferential rotating assembly, a 7-radial fine tuning assembly and an 8-axial fine tuning assembly;
21-a sliding groove;
31-supporting disc, 32-disc and 33-hand screwing;
41-fifth support plate, 42-sixth support plate, 43-seventh support plate, 44-support disk, 45-radial movement rack, 46-sensor holder, 47-gear shaft, 471-gear, 472-radial movement disk, 48-radial movement handle;
51-third hollow disc, 52-fourth hollow disc, 53-second hollow cylinder, 54-axial movement handle;
61-a first hollow disc, 62-a second hollow disc, 63-a first hollow cylinder, 64-a circumferential rotary handle and 65-a limiting piece;
71-a first supporting plate, 72-a second supporting plate, 73-a third supporting plate, 731-a first through hole, 74-a fourth supporting plate, 75-L-shaped grooves, 751-vertical grooves, 752-horizontal grooves, 76-a first sliding block, 761-a third threaded hole, 77-a radial fine tuning shaft, 771-a radial fine tuning knob and 772-a radial fine tuning limiting plate;
81-second slide block, 82-axial fine adjustment shaft, 821-axial fine adjustment knob, 822-axial fine adjustment limiting plate.
Detailed Description
The core of the application is to provide a gradient magnetic field measuring device, which can enable a magnetic field measuring sensor to be positioned at any position in a gradient magnetic field coordinate system, thereby completing the measurement of the gradient magnetic field in any region.
The present application will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present application.
Referring to fig. 1 to 9, the gradient magnetic field measuring device provided by the application comprises a magnetic field measuring sensor 1, an upper computer electrically connected with the magnetic field measuring sensor 1, and a three-dimensional moving platform for moving the magnetic field measuring sensor 1, wherein the magnetic field measuring sensor 1 and the three-dimensional moving platform are both arranged in a gradient coil (the gradient coil is not shown in the drawing of the specification), and the three-dimensional moving platform comprises: a central shaft 2, wherein one end of the central shaft 2 is provided with an external thread and a sliding groove 21, and the central shaft 2 is axially arranged in the gradient coil through a supporting device 3; the radial moving assembly 4 is arranged at the end part of the central shaft 2, the magnetic field measuring sensor 1 is arranged on the radial moving assembly 4, and the radial moving assembly 4 can enable the magnetic field measuring sensor 1 to move radially in the gradient coil; an axial moving component 5 arranged on the supporting device 3, wherein the axial moving component 5 can axially move the central shaft 2 in the gradient coil, and the axial movement of the central shaft 2 can axially move the magnetic field measuring sensor 1 in the gradient coil; and the circumferential rotating assembly 6 is arranged on the supporting device 3, the circumferential rotating assembly 6 can enable the central shaft 2 to rotate circumferentially in the gradient coil, and the magnetic field measuring sensor 1 can be enabled to rotate circumferentially in the gradient coil by rotating the central shaft 2 circumferentially.
According to the three-dimensional moving platform provided by the application, as the central shaft 2 is arranged in the gradient coil through the supporting device 3, one end of the central shaft 2 is provided with the radial moving component 4 for installing the magnetic field measuring sensor 1, the radial moving component 4 can enable the magnetic field measuring sensor 1 to move radially in the gradient coil, the axial moving component 5 and the circumferential rotating component 6 which are arranged on the supporting device 3 can enable the central shaft 2 to move axially and rotate circumferentially in the gradient coil, and as the magnetic field measuring sensor 1 is connected with the central shaft 2 through the radial moving component 4, the magnetic field measuring sensor 1 can move axially and rotate circumferentially in the gradient coil, namely, the magnetic field measuring sensor 1 can move randomly in the gradient coil and can move to any position in a gradient magnetic field coordinate system, and the measurement of a gradient magnetic field in any region can be completed.
Optionally, the magnetic field measuring sensor 1 is a gauss meter probe, which is a direct use of the prior art, and therefore, the structural features of the gauss meter probe are not described in detail in the present application.
On the basis of the above embodiment, the supporting device 3 includes two supporting plates 31, the inner sides of the two supporting plates 31 are respectively fixed with a disc 32, the two supporting plates 31 and the two discs 32 are respectively provided with a central hole penetrating and located on the same axis, the central holes are used for the central shaft 2 to penetrate so that the central shaft 2 is axially arranged in the gradient coil, the outer peripheral surfaces of the two supporting plates 31 are respectively symmetrically provided with a hand-screwed screw 33, the hand-screwed screw 33 is in threaded connection with the supporting plates 31, and the hand-screwed screw 33 is used for being attached to the gradient coil.
Specifically, the two support plates 31 are symmetrically disposed on the central shaft 2, and since the inner sides of the two support plates 31 are both provided with the circular discs 32, the two circular discs 32 are disposed opposite to each other, and since the hand screw 33 is in threaded connection with the support plate 31, and the hand screw 33 is attached to the inside of the gradient coil, the position of the support plate 31 in the gradient coil can be changed by rotating the hand screw 33, so that the starting point of the magnetic field measuring sensor 1 is located on the geometric center of the gradient coil.
Alternatively, the number of the hand screws 33 on the support plate 31 is 4, and the hand screws 33 are vertically and symmetrically arranged on the outer peripheral surface of the support plate 31.
On the basis of the embodiment, the axial moving component 5 and the circumferential rotating component 6 are both arranged on the same supporting disc 31, specifically, the axial moving component 5 and the circumferential rotating component 6 are both arranged on the supporting disc 31 far away from the radial moving component 4, the outer circumferential surface of one end, far away from the radial moving component 4, of the central shaft 2 is provided with an external thread and a sliding groove 21, the sliding groove 21 and the external thread are both axially extended to the edge of the central shaft 2, the sliding groove 21 is a concave groove and is arranged on the upper surface of the central shaft 2, the circumferential rotating component 6 comprises a first hollow disc 61 arranged on the right surface of the disc 32, a second hollow disc 62 arranged on the left surface of the supporting disc 31 and a first hollow cylinder 63 fitted in a central hole, specifically, the right surface of the disc 32 refers to the side of the disc 32 facing the radial moving component 4, the left surface of the supporting disc 31 refers to the side of the supporting disc 31 facing away from the radial moving component 4,
the first hollow disc 61 and the second hollow disc 62 are connected respectively to the both ends of first hollow cylinder 63, first hollow disc 61, second hollow disc 62 and first hollow cylinder 63 all are equipped with the first jack that wears to run through, and lie in same axis, first jack that wears to supply to be used for installing axial displacement subassembly 5, axial displacement subassembly 5 supplies to be used for center pin 2 axial to alternate the setting, be provided with circumference rotation handle 64 on the second hollow disc 62, be provided with locating part 65 on the first hollow disc 61, and the extension end of locating part 65 is located the sliding tray 21 of center pin 2, can make center pin 2 circumference rotation in the gradient coil through rotating circumference rotation handle 64.
That is, since the two ends of the first hollow cylinder 63 are respectively connected to the first hollow disc 61 and the second hollow disc 62, and the axial moving assembly 5 for axially inserting the central shaft 2 is installed in the first insertion hole, when the circumferential rotation knob 64 is rotated clockwise or counterclockwise, the second hollow disc 62 rotates along with the circumferential rotation knob 64, the first hollow disc 61 rotates along with the second hollow disc 62, and the stopper 65 rotates along with the second hollow disc 62, and since the extending end of the stopper 65 is located in the sliding groove 21 of the central shaft 2, the central shaft 2 and the axial moving assembly 5 rotate along with the stopper 65, that is, rotating the circumferential rotation knob 64 can rotate the central shaft 2 clockwise or counterclockwise in the gradient coil, that is, the circumferential rotation knob 64 reaches the circumferential rotation of the magnetic field measuring sensor 1 in the gradient coil.
On the basis of the above embodiment, the diameter of the second hollow disc 62 is larger than the diameter of the central hole and smaller than the diameter of the supporting disc 31, the second hollow disc 62 is provided with a first threaded hole penetrating through, the circumferential rotary handle 64 is installed in the first threaded hole, one end of the outer circumferential surface of the circumferential rotary handle 64 is provided with external threads, the edge of the supporting disc 31 is marked with rotation angle scales, and the second hollow disc 62 is marked with an initial line.
That is, the edge of the support plate 31 is marked with a rotation angle scale, the second hollow disc 62 is marked with an initial line, and when the circumferential rotation handle 64 is rotated clockwise or counterclockwise, the rotation angle of the center shaft 2 can be read by the rotation angle scale of the support plate 31, and the present application also provides another embodiment in which the edge of the support plate 31 is marked with an initial line, and the second hollow disc 62 is marked with a rotation angle scale; after the circumferential rotation of the central shaft 2 is completed, the second hollow disc 62 is held by hand, and the circumferential rotation handle 64 is rotated so that the circumferential rotation handle 64 moves in the first threaded hole, so that the circumferential rotation handle 64 is pressed against the left surface of the support disc 31, the circumferential rotation assembly 6 and the support disc 31 are further fixed, the central shaft 2 is prevented from rotating circumferentially in the gradient coil, and an anti-slip pad is arranged at the end part of the circumferential rotation handle 64 in order to increase the friction force between the circumferential rotation handle 64 and the left surface of the support disc 31.
On the basis of the above embodiment, the axial moving assembly 5 includes the third hollow disc 51 disposed on the right surface of the first hollow disc 61, the fourth hollow disc 52 disposed on the left surface of the second hollow disc 62, and the second hollow cylinder 53 attached to the second hollow cylinder 53 disposed in the first insertion hole, specifically, the right surface of the first hollow disc 61 refers to the surface of the first hollow disc 61 facing the radial moving assembly 4, the left surface of the second hollow disc 62 refers to the surface of the second hollow disc 62 facing away from the radial moving assembly 4, two ends of the second hollow cylinder 53 are respectively connected to the third hollow disc 51 and the fourth hollow disc 52, the third hollow disc 51, the fourth hollow disc 52 and the second hollow cylinder 53 are all provided with second insertion holes penetrating and being disposed on the same axis, the second insertion holes are used for axial insertion of the central shaft 2, the second insertion holes of the second hollow cylinder 53 are provided with internal threads matching with external threads of the central shaft 2, and the fourth hollow disc 52 is provided with the axial moving handle 54.
That is, after the clockwise or counterclockwise rotation of the central shaft 2 is completed, the fixing of the circumferential rotation component 6 and the supporting disc 31 is realized, that is, the locking of the circumferential rotation component 6 is realized, the central shaft 2 is prevented from rotating circumferentially in the gradient coil, and then the axial movement handle 54 drives the fourth hollow disc 52 to rotate by rotating the axial movement handle 54 clockwise or counterclockwise, and because the two ends of the second hollow cylinder 53 are respectively connected with the third hollow disc 51 and the fourth hollow disc 52, the rotation of the second hollow cylinder 53 is realized, at this time, the central shaft 2 is prevented from rotating clockwise or counterclockwise due to the locking of the circumferential rotation component 6, and then the central shaft 2 is driven to move axially when the second hollow cylinder 53 rotates, that is, the axial movement of the magnetic field measuring sensor in the gradient coil is realized by rotating the axial movement handle 54.
On the basis of the above embodiment, the diameter of the third hollow disc 51 is smaller than the diameter of the first hollow disc 61 and larger than the diameter of the first insertion hole, the diameter of the fourth hollow disc 52 is smaller than the diameter of the second hollow disc 62 and larger than the diameter of the first insertion hole, the fourth hollow disc 52 is provided with a second threaded hole penetrating therethrough, the second threaded hole is used for installing the axially movable handle 54, the outer circumferential surface of one end of the axially movable handle 54 is provided with external threads, the edge of the second hollow disc 62 is marked with axially movable scales, and the fourth hollow disc 52 is marked with an initial line.
That is, the edge of the second hollow disc 62 is marked with an axial movement scale, the fourth hollow disc 52 is marked with an initial line, and when the axial movement handle 54 is rotated clockwise or counterclockwise, the axial movement length of the center shaft 2 can be read by the axial movement scale of the second hollow disc 62, and the present application also provides another embodiment in which the edge of the second hollow disc 62 is marked with an initial line, and the fourth hollow disc 52 is marked with an axial movement scale; after the axial movement of the central shaft 2 is completed, the fourth hollow disc 52 is held by hand, and the axial movement handle 54 is rotated to enable the axial movement handle 54 to move in the second threaded hole, so that the axial movement handle 54 is pressed against the left surface of the second hollow disc 62, further fixation of the axial movement assembly 5 and the second hollow disc 62 is achieved, the central shaft 2 is prevented from moving axially in the gradient coil, and in order to increase friction force between the axial movement handle 54 and the left surface of the second hollow disc 62, an anti-slip pad is arranged at the end of the axial movement handle 54.
On the basis of the embodiment, the radial moving component 4 is arranged at the right end of the central shaft 2 through a fine adjustment device, the fine adjustment device comprises a radial fine adjustment component 7 and an axial fine adjustment component 8 connected with the radial fine adjustment component 7, the radial fine adjustment component 7 is arranged at the right end of the central shaft 2, and the radial moving component 4 is arranged on the axial fine adjustment component 8.
On the basis of the above embodiment, the radial fine adjustment assembly 7 includes the first support plate 71 and the second support plate 72, and the first support plate 71 and the second support plate 72 are symmetrically disposed about the central axis 2, the first support plate 71 and the second support plate 72 are fixedly connected through the third support plate 73 and the fourth support plate 74, specifically, the shapes of the first support plate 71 and the second support plate 72 are all L-shaped, the third support plate 73 is used for fixedly connecting the upper ends of the first support plate 71 and the second support plate 72, the fourth support plate 74 is used for fixedly connecting the right lower ends of the first support plate 71 and the second support plate 72, the facing surfaces of the first support plate 71 and the second support plate 72 are all provided with L-shaped grooves 75, the L-shaped grooves 75 include vertical grooves 751 and horizontal grooves 752 which are mutually communicated, the end of the central axis 2 is fixedly provided with a first slider 76, the first slider 76 can radially slide in the two vertical grooves 751, the first slider 76 is provided with a third threaded hole 761 which is radially penetrated, the third support plate 73 is provided with a first through hole 731 which is penetrated in a penetrating manner, the first through hole 761 which is fixedly connected, the first through hole 731 is located on the same axis, the first threaded hole 731 is located on the radially outer surface of the same axis, the first support plate is located on the radially outer surface of the radially fine adjustment plate 7772, the first fine adjustment plate is located on the radially outer surface of the radially fine adjustment plate 77772, and the radially fine adjustment plate is located on the radially outer surface of the radially fine adjustment plate 7772, and the radially fine adjustment plate is located on the radially upper surface is located radially inner surface 77772, and is located on the radially upper surface of the fine adjustment plate 771.
That is, by rotating the radial fine adjustment knob 771 clockwise or counterclockwise to achieve the rotation of the radial fine adjustment shaft 77 in the first through hole 731, since the radial fine adjustment shaft 77 is screw-coupled with the first slider 76 and the position of the first slider 76 in the radial direction is maintained and the radial fine adjustment limiting plate 772 is fitted to the lower surface of the third support plate 73, the sliding of the vertical grooves 751 of the first support plate 71 and the second support plate 72 with respect to the first slider 76, that is, the movement of the first support plate 71 and the second support plate 72 with respect to the central shaft 2 in the radial direction is achieved, since the axial fine adjustment assembly 8 is coupled with the first support plate 71 and the second support plate 72 and the axial fine adjustment assembly 8 is used to mount the radial movement assembly 4, the radial movement assembly 4 is used to mount the magnetic field measurement sensor, that is, the fine adjustment of the position of the magnetic field measurement sensor 1 in the radial direction is achieved.
On the basis of the above embodiment, the axial fine adjustment assembly 8 includes a second sliding block 81 for mounting the radial movement assembly 4, the second sliding block 81 is capable of sliding axially in two horizontal grooves 752, the second sliding block 81 is provided with a fourth threaded hole penetrating axially, the fourth supporting plate 74 is provided with a second through hole penetrating axially, the second through hole and the fourth threaded hole are located on the same axis, an axial fine adjustment shaft 82 is inserted in the second through hole, the axial fine adjustment shaft 82 is provided with an axial fine adjustment knob 821 and an axial fine adjustment limiting plate 822, the diameters of the axial fine adjustment knob 821 and the axial fine adjustment limiting plate 822 are both larger than the aperture of the second through hole, the axial fine adjustment knob 821 is attached to the right surface of the fourth supporting plate 74, the axial fine adjustment limiting plate 822 is attached to the left surface of the fourth supporting plate 74, and the extending end of the axial fine adjustment shaft 82 is provided with external threads so that the axial fine adjustment shaft 82 is in threaded connection with the second sliding block 81.
That is, by rotating the axial trimming knob 821 clockwise or counterclockwise, the axial trimming shaft 82 rotates in the second through hole, and since the axial trimming shaft 82 is in threaded connection with the second slider 81 and the axial trimming knob 821 is fitted on the right surface of the fourth support plate 74, the axial trimming limiting plate 822 is fitted on the left surface of the fourth support plate 74, so that the second slider 81 slides axially in the two horizontal slots 752, and since the radial moving assembly 4 is fixedly connected with the second slider 81 and the radial moving assembly 4 is provided with the magnetic field measuring sensor, that is, the positional trimming of the magnetic field measuring sensor 1 in the axial direction is realized.
By the arrangement of the fine tuning device, the radial fine tuning component 7 can realize the fine tuning of the position of the magnetic field measurement sensor 1 in the radial direction, the axial fine tuning component 8 can realize the fine tuning of the position of the magnetic field measurement sensor 1 in the axial direction, and when the actual zero point of the gradient magnetic field generated by the gradient coil is inconsistent with the geometric center of the gradient coil, the position of the magnetic field measurement sensor 1 can be conveniently fine-tuned by adjusting the radial fine tuning component 7 and the axial fine tuning component 8 so as to determine the actual zero point position of the gradient magnetic field generated by the gradient coil.
On the basis of the above embodiment, the radial moving assembly 4 includes a fifth supporting plate 41, a sixth supporting plate 42, a seventh supporting plate 43 and a supporting disc 44 which are fixedly connected, the fifth supporting plate 41 and the sixth supporting plate 42 are oppositely arranged and located on the inner sides of the first supporting plate 71 and the second supporting plate 72, the seventh supporting plate 43 and the supporting disc 44 are fixedly arranged between the fifth supporting plate 41 and the sixth supporting plate 42, specifically, the seventh supporting plate 43 and the supporting disc 44 are respectively arranged on the right surfaces of the fifth supporting plate 41 and the sixth supporting plate 42, the supporting disc 44 is located above the seventh supporting plate 43, the outer wall of the seventh supporting plate 43 is fixedly connected with the second sliding block 81, the supporting disc 44 is provided with a third through hole penetrating axially, the inner side of the fifth supporting plate 41 is provided with a slidable radial moving rack 45, the upper end of the radial moving rack 45 is provided with a sensor bracket 46, and the sensor bracket 46 is used for mounting the magnetic field measuring sensor 1, and the magnetic field measuring sensor 1 is radially moved in the gradient coil by the radial moving rack 45 on the fifth supporting plate 41.
Specifically, the fifth support plate 41, the sixth support plate 42, and the seventh support plate 43 are square plate-like members, and the sensor bracket 46 has a square cross section, facilitating the installation of the magnetic field measuring sensor 1.
On the basis of the above embodiment, the inner wall of the fifth support plate 41 is provided with a guide rail, the back side of the radial movement rack 45 is provided with a clamping groove matched with the guide rail so that the radial movement rack 45 can slide radially on the guide rail, the third through hole is provided with a gear shaft 47 in a penetrating way, one end of the gear shaft 47 is provided with a gear 471 meshed with the radial movement rack 45, the other end of the gear shaft 47 is connected with a radial movement disc 472, the radial movement disc 472 is attached to the outer side of the support disc 44, the radial movement disc 472 is provided with a fifth threaded hole penetrating axially, the fifth threaded hole is used for installing the radial movement handle 48, and the outer circumferential surface of one end of the radial movement handle 48 is provided with external threads.
Specifically, the diameter of the support disk 44 is greater than the diameter of the radially movable disk 472, the radial movement graduations are marked on the edge of the support disk 44, and the radial movable disk 472 is marked with an initiation line.
That is, when the radial moving handle 48 is rotated clockwise or counterclockwise, the radial moving handle 48 drives the radial moving disk 472 to rotate, the radial moving disk 472 drives the gear shaft 47 to rotate, and the gear 471 arranged on the gear shaft 47 is meshed with the radial moving rack 45, so that the radial moving rack 45 and the sensor bracket 46 slide radially on the fifth supporting plate 41, that is, the magnetic field measuring sensor 1 moves radially in the gradient coil, after the magnetic field measuring sensor 1 moves radially, the radial moving disk 472 is held by hand and the radial moving handle 48 is rotated to move the radial moving handle 48 in the fifth threaded hole, so that the surface of the radial moving handle 48 and the supporting disk 44 is pressed, the radial moving assembly 4 and the supporting disk 44 are fixed, the magnetic field measuring sensor 1 is prevented from moving in the radial direction, and an anti-slip pad is arranged at the end of the radial moving handle 48 in order to increase the friction force between the radial moving handle 48 and the surface of the supporting disk 44.
That is, the radial movement graduations are marked on the edge of the support disk 44, the radial movement graduations are marked on the radial movement disk 472, and when the radial movement handle 48 is rotated clockwise or counterclockwise, the radial movement length of the magnetic field measuring sensor 1 can be read by the radial movement graduations of the support disk 44, and the present application also provides another embodiment in which the radial movement graduations are marked on the radial movement disk 472 and the radial movement graduations are marked on the edge of the support disk 44.
The radial moving assembly 4, the axial moving assembly 5 and the circumferential rotating assembly 6 provided by the application realize radial, axial and circumferential position adjustment of the magnetic field measuring sensor 1 in the gradient magnetic field coordinate system, realize that the magnetic field measuring sensor 1 can move at any coordinate position in the gradient magnetic field coordinate system, and are convenient to move and operate, and the moving precision of the radial moving assembly 4, the axial moving assembly 5 and the circumferential rotating assembly 6 is high, so that the gradient magnetic field measuring precision is high.
On the basis of the embodiment, the materials of all parts of the gradient magnetic field measuring device are nonmagnetic materials, and optionally, the nonmagnetic materials are MC nylon or nonmagnetic hard alloy.
It should be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The gradient magnetic field measuring device provided by the application is described in detail above. The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
Claims (8)
1. The utility model provides a gradient magnetic field measuring device, includes magnetic field measurement sensor (1), with the host computer that magnetic field measurement sensor (1) electricity is connected and removal the three-dimensional moving platform of magnetic field measurement sensor (1), magnetic field measurement sensor (1) with in the gradient coil is all located to three-dimensional moving platform, its characterized in that, three-dimensional moving platform includes:
the central shaft (2), one end of the central shaft (2) is provided with an external thread and a sliding groove (21), and the central shaft (2) is axially arranged in the gradient coil through a supporting device (3);
a radial moving assembly (4), wherein the radial moving assembly (4) is arranged at the end part of the central shaft (2), the magnetic field measuring sensor (1) is arranged on the radial moving assembly (4), and the radial moving assembly (4) can enable the magnetic field measuring sensor (1) to move radially in the gradient coil;
an axial movement assembly (5) arranged on the supporting device (3), wherein the axial movement assembly (5) can enable the central shaft (2) to move axially in the gradient coil, and the central shaft (2) can enable the magnetic field measurement sensor (1) to move axially in the gradient coil;
the circumferential rotating assembly (6) is arranged on the supporting device (3), the central shaft (2) can be circumferentially rotated in the gradient coil by the circumferential rotating assembly (6), and the magnetic field measuring sensor (1) can be circumferentially rotated in the gradient coil by the circumferential rotation of the central shaft (2);
the supporting device (3) comprises two supporting plates (31), the inner sides of the two supporting plates (31) are fixedly provided with circular discs (32), the two supporting plates (31) and the two circular discs (32) are provided with center holes which penetrate through and are positioned on the same axis, the center holes are used for the center shaft (2) to penetrate through so that the center shaft (2) is axially arranged in the gradient coil, and the outer peripheral surfaces of the two supporting plates (31) are symmetrically provided with hand-screwed screws (33);
the axial moving assembly (5) and the circumferential rotating assembly (6) are all arranged on the same supporting disc (31), the circumferential rotating assembly (6) comprises a first hollow disc (61) arranged on the outer side of the disc (32), a second hollow disc (62) arranged on the outer side of the supporting disc (31) and a first hollow cylinder (63) which is arranged in the central hole in a fitting mode, two ends of the first hollow cylinder (63) are respectively connected with the first hollow disc (61) and the second hollow disc (62), the first hollow disc (61) and the second hollow disc (62) and the first hollow cylinder (63) are all provided with first penetrating holes which penetrate through and are positioned on the same axis, the first penetrating holes are used for installing the axial moving assembly (5), the axial moving assembly (5) is used for axially penetrating and arranging the central shaft (2), the second hollow disc (62) is provided with a circumferential rotating handle (64), the first hollow disc (61) is provided with a circumferential gradient member (65), and the circumferential gradient member (65) is arranged in the circumferential gradient member (2) and the circumferential gradient member (65) is arranged in the rotating handle (2).
2. The gradient magnetic field measurement device according to claim 1, wherein the second hollow disc (62) is provided with a first threaded hole therethrough, the circumferential rotation handle (64) is mounted in the first threaded hole, the circumferential rotation handle (64) is provided with external threads on the outer circumferential surface, the edge of the support disc (31) is marked with rotation angle scales, and the second hollow disc (62) is marked with a start line.
3. The gradient magnetic field measurement device according to claim 2, wherein the axial movement assembly (5) comprises a third hollow disc (51) arranged on the outer side of the first hollow disc (61), a fourth hollow disc (52) arranged on the outer side of the second hollow disc (62) and a second hollow cylinder (53) fitted in the first through hole, two ends of the second hollow cylinder (53) are respectively connected with the third hollow disc (51) and the fourth hollow disc (52), the third hollow disc (51), the fourth hollow disc (52) and the second hollow cylinder (53) are respectively provided with a second through hole penetrating through and positioned on the same axis, the second through hole is used for the axial penetration of the central shaft (2), the second through hole of the second hollow cylinder (53) is provided with an internal thread matched with the external thread of the central shaft (2), the fourth hollow disc (52) is provided with a second through hole for installing the axial movement knob (54), and the axial movement knob (52) is provided with a hollow circumferential surface (52) with an axial outer thread mark.
4. The gradient magnetic field measurement device according to claim 1, wherein the radial movement assembly (4) is arranged at the end of the central shaft (2) through a fine adjustment device, the fine adjustment device comprises a radial fine adjustment assembly (7), and an axial fine adjustment assembly (8) connected with the radial fine adjustment assembly (7), the radial fine adjustment assembly (7) is arranged at the end of the central shaft (2), and the radial movement assembly (4) is mounted on the axial fine adjustment assembly (8).
5. The gradient magnetic field measurement device according to claim 4, wherein the radial fine adjustment assembly (7) comprises a first support plate (71) and a second support plate (72), the first support plate (71) and the second support plate (72) are symmetrically arranged around the central shaft (2), the first support plate (71) and the second support plate (72) are fixedly connected through a third support plate (73) and a fourth support plate (74), the inner walls of the first support plate (71) and the second support plate (72) are respectively provided with an L-shaped groove (75), the L-shaped grooves (75) comprise vertical grooves (751) and horizontal grooves (752) which are mutually communicated, a first slider (76) is fixedly arranged at the end part of the central shaft (2), the first slider (76) can radially slide in the two vertical grooves (751), the first slider (76) is provided with a third threaded hole (761) which is radially penetrated, the third support plate (73) is provided with a first through hole (731) which is radially penetrated, the first fine adjustment assembly is arranged on the first shaft (731) and the first shaft (7772) which is radially and the same as the first fine adjustment assembly is arranged on the first shaft (77772), the radial fine adjustment knob (771) is attached to the upper surface of the third support plate (73), the radial fine adjustment limiting plate (772) is attached to the lower surface of the third support plate (73), and external threads are arranged at the lower end of the radial fine adjustment shaft (77), so that the radial fine adjustment shaft (77) is in threaded connection with the first sliding block (76).
6. The gradient magnetic field measurement device according to claim 5, characterized in that the axial trimming assembly (8) comprises a second slider (81) for mounting the radial moving assembly (4), the second slider (81) is axially slidable in two horizontal grooves (752), the second slider (81) is provided with a fourth threaded hole which is axially penetrated, the fourth support plate (74) is provided with a second through hole which is axially penetrated, the second through hole and the fourth threaded hole are located on the same axis, and an axial trimming shaft (82) is inserted in the second through hole, the axial trimming shaft (82) is provided with an axial trimming knob (821) and an axial trimming limiting plate (822), the axial trimming knob (821) is fitted on the outer side of the fourth support plate (74), the axial trimming limiting plate (822) is fitted on the inner side of the fourth support plate (74), and the extending end of the axial trimming shaft (82) is provided with an external thread so that the axial trimming shaft (82) is connected with the second slider (81) by the thread.
7. The gradient magnetic field measurement device according to claim 6, characterized in that the radial movement assembly (4) comprises a fifth support plate (41), a sixth support plate (42), a seventh support plate (43) and a support disc (44) which are fixedly connected, the fifth support plate (41) and the sixth support plate (42) are oppositely arranged and are positioned on the inner sides of the first support plate (71) and the second support plate (72), the seventh support plate (43) and the support disc (44) are fixedly arranged between the fifth support plate (41) and the sixth support plate (42), the outer wall of the seventh support plate (43) is fixedly connected with the second slider (81), the support disc (44) is provided with a third through hole which penetrates axially, the inner side of the fifth support plate (41) is provided with a slidable radial movement rack (45), the upper end of the radial movement rack (45) is provided with a sensor bracket (46), the sensor bracket (46) is used for installing the magnetic field measurement sensor (1), and the radial movement of the magnetic field measurement sensor (1) is realized on the radial movement rack (45) by the fifth support plate (41).
8. The gradient magnetic field measurement device according to claim 7, wherein a guide rail is provided on an inner wall of the fifth support plate (41), a clamping groove matched with the guide rail is provided on a back side of the radial movement rack (45) so that the radial movement rack (45) can slide radially on the guide rail, a gear shaft (47) is provided through the third through hole in a penetrating manner, a gear (471) meshed with the radial movement rack is provided at one end of the gear shaft (47), a radial movement disc (472) is connected to the other end of the gear shaft (47), the radial movement disc (472) is attached to an outer side of the support disc (44), a fifth threaded hole penetrating axially is provided on the radial movement disc (472), the fifth threaded hole is used for installing a radial movement handle (48), a radial movement scale is marked on an edge of the support disc (44), and a starting line is marked on the radial movement disc (472).
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