CN110764030B - Radio frequency coil device of optical pump magnetometer - Google Patents
Radio frequency coil device of optical pump magnetometer Download PDFInfo
- Publication number
- CN110764030B CN110764030B CN201911112269.8A CN201911112269A CN110764030B CN 110764030 B CN110764030 B CN 110764030B CN 201911112269 A CN201911112269 A CN 201911112269A CN 110764030 B CN110764030 B CN 110764030B
- Authority
- CN
- China
- Prior art keywords
- groove
- coil
- grooves
- shaped groove
- radio frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0011—Arrangements or instruments for measuring magnetic variables comprising means, e.g. flux concentrators, flux guides, for guiding or concentrating the magnetic flux, e.g. to the magnetic sensor
-
- 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
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/24—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/26—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux using optical pumping
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34007—Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34084—Constructional details, e.g. resonators, specially adapted to MR implantable coils or coils being geometrically adaptable to the sample, e.g. flexible coils or coils comprising mutually movable parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34092—RF coils specially adapted for NMR spectrometers
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The embodiment of the invention provides a radio frequency coil device, which comprises a coil bracket and a coil, wherein a hollow cavity is formed on the inner surface of the coil bracket, and the outer surface of the coil bracket is used for fixing the coil; a groove is formed in the outer surface of the coil support, a plurality of sub-grooves are formed in the groove, the coil is sequentially wound and arranged in the sub-grooves to form a multi-turn coil, and the direction of a magnetic field generated by the coil is perpendicular to the central axis of the coil support. The embodiment of the invention also provides a magnetometer which comprises the radio frequency coil device and the atom air chamber, wherein the atom air chamber is arranged in a hollow cavity formed by the coil support. The radio frequency coil device of the embodiment of the invention reduces the occupied space of the coil, has flexible and adjustable appearance and size and is convenient to install; in the composition of the magnetometer, the integral configuration formed by the coil and the atomic gas chamber is more miniaturized.
Description
Technical Field
The invention relates to a magnetic resonance radio frequency coil, in particular to a radio frequency coil device of an optical pump magnetometer.
Background
The optical pump magnetometer is developed based on Zeeman splitting of helium and atoms of alkali metals rubidium, cesium and the like in an external magnetic field by adopting an optical pump and a magnetic resonance technology. The optical pump magnetometer is widely applied to the fields of geological structure exploration, mineral resource detection, biomedicine, geomagnetic navigation and the like. The optical pump magnetometer generally comprises an atom gas chamber, a radio frequency coil and other structures, wherein the radio frequency coil is used for providing a magnetic field in a specific direction for atoms in the atom gas chamber, so that the atoms perform magnetic resonance.
The radio frequency coil is an important component of a magnetometer, and an alternating magnetic field generated by the radio frequency coil is used for enabling electrons in a dark state in an atomic gas chamber to generate transition, namely photomagnetic resonance. In practical application, the radio frequency coil occupies a large space and is not beneficial to installation, and the miniaturization and integration of the magnetometer are restricted.
Based on the defects, the invention needs to improve the existing structure of the magnetometer radio-frequency coil, and provides the radio-frequency coil device designed by matching with the shape of the atomic gas chamber in combination with the shape of the common atomic gas chamber for bearing the radio-frequency coil, so that the integral structure of the atomic gas chamber and the radio-frequency coil is more compact, the coil size can be flexibly configured according to the shape and the size of the atomic gas chamber, and meanwhile, the installation is convenient.
Disclosure of Invention
In order to solve at least one of the above technical problems, embodiments of the present invention provide a radio frequency coil device for an optical pumping magnetometer, which uses the shape of an atomic gas chamber as a basis, adopts a hollow support to accommodate the atomic gas chamber, and sets a radio frequency coil on the support, so that the arrangement space of the radio frequency coil relative to the atomic gas chamber is greatly reduced, and thus the whole composed of the atomic gas chamber and the radio frequency coil is more compact, which undoubtedly also reduces the whole assembly of the magnetometer; the radio frequency coil device has the advantages of simple structure, flexible and adjustable size and convenient installation.
According to one aspect of the invention, a radio frequency coil device is provided, which comprises a coil support and a coil, wherein the inner surface of the coil support forms a hollow cavity, and the outer surface of the coil support is used for fixing the coil.
In one embodiment, a groove is formed on an outer surface of the coil support, the groove being configured to secure the coil; the direction of the magnetic field generated by the coil is vertical to the central axis of the coil support.
Further, the interior of the groove comprises a plurality of sub-grooves, and the shapes of the sub-grooves are the same as the shape of the groove; the distance between every two adjacent sub-grooves of the plurality of sub-grooves is the same; and the coil is sequentially wound and arranged in the plurality of sub-grooves to form a multi-turn coil.
In another embodiment, the inner surface of the coil support forms a cylindrical hollow cavity, and the outer surface of the coil support forms a first groove and a second groove, which are symmetrical with respect to the central axis of the cylinder.
Furthermore, the first groove and the second groove respectively comprise an upper arc-shaped groove and a lower arc-shaped groove along the cylindrical circumferential direction, and the upper arc-shaped groove and the lower arc-shaped groove are respectively arranged close to the upper circumferential surface and the lower circumferential surface of the cylindrical outer surface of the coil support; the adjacent two ends of the upper arc-shaped groove and the lower arc-shaped groove are respectively connected through straight grooves, and the straight grooves are parallel to the direction of the cylindrical central axis.
Furthermore, the upper arc-shaped groove and the lower arc-shaped groove are symmetrical to each other; and the straight grooves which are respectively connected with the two adjacent ends of the upper arc-shaped groove and the lower arc-shaped groove are mutually symmetrical.
In another embodiment, a plurality of upper arc-shaped sub-grooves and lower arc-shaped sub-grooves are respectively arranged in the upper arc-shaped groove and the lower arc-shaped groove; a plurality of straight sub-grooves are arranged in the straight grooves; the upper arc-shaped sub-grooves, the lower arc-shaped sub-grooves and the straight sub-grooves are respectively connected to form a plurality of sub-grooves; the plurality of sub-grooves are arranged at equal intervals in the first groove and/or the second groove.
In another embodiment, the upper arc-shaped groove and the lower arc-shaped groove are respectively connected with the straight groove, and the upper arc-shaped groove, the lower arc-shaped groove and the straight groove respectively extend for a distance to be used for leading out a tail end lead-out wire of the coil.
Further, the coil starts to be wound and fixed in the first groove, and the coil continues to be wound and fixed in the second groove after being wound and fixed in the first groove; the winding directions of the coils in the first groove and the second groove are the same; the magnetic field directions generated by the coils in the first groove and the second groove are the same, and the magnetic field directions are perpendicular to the central axis of the cylinder.
According to the radio frequency coil device, the relation between the excitation current introduced into the coil and the generated magnetic field intensity is calculated according to the magnetic permeability and the diameter of the coil material and the number of turns of the coil, so that when the radio frequency coil is applied, the known excitation current can be used for correspondingly obtaining the magnetic field intensity generated by the radio frequency coil.
According to another aspect of the present invention, there is provided a magnetometer comprising a radio frequency coil device and an atomic gas cell, wherein the radio frequency coil device comprises a coil support and a coil, an inner surface of the coil support forms a hollow cavity configured to receive the atomic gas cell, and an outer surface of the coil support is used to fix the coil.
According to another aspect of the invention, there is provided a magnetometer comprising a radio frequency coil arrangement and an atom gas cell, wherein the atom gas cell is cylindrical; the radio frequency coil device comprises a coil support and a coil, wherein a cylindrical hollow cavity is formed on the inner surface of the coil support and is arranged to accommodate the atomic gas chamber; a groove is formed on the outer surface of the coil support and is used for fixing the coil; the grooves include a first groove and a second groove, which are symmetrical with respect to a central axis of the cylindrical shape.
Furthermore, the first groove and the second groove respectively comprise an upper arc-shaped groove and a lower arc-shaped groove along the cylindrical circumferential direction, and the upper arc-shaped groove and the lower arc-shaped groove are respectively arranged close to the upper circumferential surface and the lower circumferential surface of the cylindrical outer surface of the coil support; the adjacent two ends of the upper arc-shaped groove and the lower arc-shaped groove are respectively connected through straight grooves, and the straight grooves are parallel to the direction of the cylindrical central axis.
Further, the outer surface of the coil support is provided with a side opening, the side opening is parallel to the central axis direction of the cylinder, and the side opening is positioned between two adjacent straight grooves of the first groove and the second groove; the side openings are configured to receive protruding portions of the atomic gas cell.
Compared with the prior art, the invention has at least one of the following beneficial effects:
(1) the radio frequency coil device provided by the embodiment of the invention has a certain internal space and a surface, wherein the internal space is used for accommodating a structure containing magnetic resonance substances to be measured, and the surface is used for installing the coil, so that the overall configuration of the coil and the internal structure is more compact, and the occupied space of the coil is reduced;
(2) the radio frequency coil device provided by the embodiment of the invention has the advantages that the appearance and the size are determined according to the appearance and the size of a structure to be accommodated in the radio frequency coil device, so that the radio frequency coil device is flexible and adjustable and is convenient to mount;
(3) according to the magnetometer provided by the embodiment of the invention, the coil support is sleeved on the surface of the atomic gas chamber, and the coil is embedded in the groove on the surface of the support, so that the combination is adopted, and the miniaturization of the configuration of the magnetometer is realized.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
Fig. 1 is a schematic structural view of a radio frequency coil device according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic view of another angular configuration of the RF coil assembly of FIG. 1;
FIG. 3 is a schematic view of another angular configuration of the RF coil assembly of FIG. 1;
fig. 4 is a schematic diagram of a coil formed on a radio frequency coil assembly in accordance with one embodiment of the present invention.
It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
In the existing magnetometer, the position relationship between the atomic gas cell and the radio frequency coil for providing the magnetic field thereto is generally: the atomic gas chamber is positioned in the center, and the radio frequency coils are distributed on the left side and the right side of the atomic gas chamber; the radio frequency coil is supported by a support and is difficult to be close to the periphery of the atomic gas chamber, so that the transverse occupied space of the integral structure formed by the radio frequency coil and the atomic gas chamber is larger, and the size reduction of the magnetometer probe is more unfavorable. Considering that the radio frequency coil is fully close to the outer surface of the atomic gas chamber, and on the premise of not changing the original magnetic field effect, the invention adopts a nested method, so that the occupied space of the radio frequency coil is reduced, and the miniaturization of the magnetometer probe is realized.
Referring to fig. 1-3, one embodiment of a radio frequency coil assembly in an embodiment of the present application: the radio frequency coil device 100 includes a coil support 10 and a coil (not shown), wherein the inner surface of the coil support 10 forms a hollow cavity 101, and the outer surface of the coil support 10 is used for fixing the coil.
Specifically, the radio frequency coil device 100 is used for carrying and fixing a radio frequency coil, that is, implemented by a coil support 10; the coil support 10 is hollow, the inner space of the coil support is used for placing a substance to be measured for generating magnetic resonance or a structure containing the substance, the outer surface of the coil support 10 is used for fixing a coil, and the coil is used for generating a magnetic field.
In order to avoid the coil support from occupying too large space, the coil support can be designed according to the shape and the size of a structure to be sleeved by the support; the structure which has a certain shape and is used for containing the magnetic resonance substance to be measured is placed in the hollow cavity of the coil bracket, and the coil is arranged on the outer surface of the bracket, so that the coil provides a magnetic field for the substance in the inner space of the coil, and the requirement of magnetic resonance is met. The coil, the coil support and the structure contained inside the support, the structure becomes very compact as a whole.
The size of the coil support is flexibly set according to actual needs, and it can be understood that the coil support can be made of polytetrafluoroethylene and other materials as long as the material does not interfere with a magnetic field. Meanwhile, the coil support can be manufactured by adopting a 3D printing additive technology, and the coil support can be manufactured by adopting any technological means which can meet the requirements on the shape, the size and the like of the coil support.
It will be appreciated that the above-described coil support structure for nesting may be, for example, an atomic gas cell, used in a magnetometer package.
Further, in the present embodiment, a groove is formed on the outer surface of the coil support 10, the groove being provided to fix the coil; the direction of the magnetic field generated by the coil is vertical to the central axis of the coil support.
Specifically, in order to fix the coil, a groove is arranged on the outer surface of the bracket, and the groove can be integrally formed with the bracket or machined on the surface of the prepared bracket for the second time and is determined according to different preparation processes. It will be appreciated that the size and number of grooves are set according to the size and number of coils to be fixed as required.
It will be appreciated that the coil can fit into the small space provided by the recess, thereby securing the coil to the surface of the stent. When the coil is loaded in the groove, an adhesive such as an insulating paste may be used, thereby enhancing the fixing effect.
In order to enable the direction of the magnetic field generated by the coil to meet the actual requirement, certain requirements are set on the position of the groove on the surface of the bracket. The coil is fixed in the groove to form a shape, the direction of a magnetic field generated by the coil is perpendicular to the central axis of the bracket, and the generated magnetic field in the direction can meet the requirement of providing a magnetic field required by work for the magnetic resonance substance to be measured in the cavity in the bracket.
Further, the interior of the groove comprises a plurality of sub-grooves, and the shapes of the sub-grooves are the same as those of the groove; the distance between every two adjacent sub-grooves of the plurality of sub-grooves is the same; the coil is sequentially wound and arranged in the plurality of sub-grooves to form a multi-turn coil.
In particular, the number of turns used to form the coil is typically a plurality of turns, and in order to prevent overlapping or confusion between each turn of coil mounted in the groove, a plurality of sub-grooves are provided in the groove, and obviously, the size of the sub-grooves is smaller than that of the groove. In order to arrange the multi-turn coil regularly, the distance between every two adjacent sub-grooves of the plurality of sub-grooves can be the same, and certainly can be different. Therefore, when a plurality of sub-grooves are formed in one groove, the coils are sequentially arranged and installed according to the arrangement sequence of the sub-grooves, so that each turn of the coil can be effectively fixed, and the installation time can be greatly reduced.
It can be understood that the number of the sub-grooves can be determined according to the number of the required winding fixed coil turns; simultaneously, the coil which can be wound and fixed in each sub-groove can be one or more turns, so long as the total number of turns of the coil is reasonably distributed, and the current passing cannot be influenced due to improper winding among the coils.
On the basis of the above embodiments, referring to fig. 1-3, another embodiment of the radio frequency coil device in the embodiment of the present application: the radio frequency coil device 100 includes a coil support 10 and a coil (not shown), wherein an inner surface of the coil support 10 forms a cylindrical hollow cavity 101, and an outer surface of the coil support forms a first groove 102 and a second groove 103, and the first groove 102 and the second groove 103 are symmetrical with respect to a central axis of the cylinder.
Specifically, the overall configuration of the coil support 10 may be configured according to the shape of the structure to be accommodated therein, for example, when the coil support 10 is used to be sleeved on the surface of the atom air cell having a cylindrical shape, the coil support 10 may form a housing structure having a cylindrical hollow cavity 101, so that only the coil support 10 is sleeved on the surface of the atom air cell, or the atom air cell is accommodated in the hollow cavity 101 of the coil support 10, thereby providing a magnetic field to the atoms in the atom air cell. By adopting the matching mode of the sleeving structure, the radio frequency coil can be closer to the outer surface of the atomic gas chamber, so that the whole structure of the radio frequency coil and the atomic gas chamber is more compact, and the occupied space of the radio frequency coil is reduced.
It can be understood that, in order to avoid the coil support occupying too much space, the external dimension of the support is determined according to the external dimension of the atomic gas cell, so that the matching relationship of the two is more fit.
Further, the number of grooves on the outer surface of the coil support may be, for example, two, as shown in fig. 1 and 3, the outer shape of the coil support 10 is cylindrical, and when the hollow chamber 101 is directed toward the paper, the grooves may be divided into a first groove 102 on the left surface of the cylinder and a second groove 103 on the right surface of the cylinder, and the first groove 102 and the second groove 103 are symmetrical with respect to the center line, and it can also be understood that when the coil support 10 is erected (i.e., when the hollow chamber 101 is directed toward the ground), the first groove 102 and the second groove 103 are symmetrical with respect to the central axis of the cylinder. The first groove 102 and the second groove 103 are arranged symmetrically with respect to the two sides of the cylindrical surface, so that the distribution of the magnetic field formed by the coils located in the grooves is also symmetrical, and the requirement of covering the working range of the magnetic field to be provided can be met.
Further, in this embodiment, the first groove and the second groove each include an upper arc-shaped groove and a lower arc-shaped groove along the cylindrical circumferential direction, and the upper arc-shaped groove and the lower arc-shaped groove are respectively disposed adjacent to the upper and lower circumferential surfaces of the cylindrical outer surface of the coil support; the adjacent two ends of the upper arc-shaped groove and the lower arc-shaped groove are respectively connected through straight grooves, and the straight grooves are parallel to the direction of the cylindrical central axis.
Specifically, referring to fig. 1 and 2, the first groove 102 includes an upper arc-shaped groove 1021, a lower arc-shaped groove 1022, a straight groove 1023, and a straight groove 1024, wherein the upper arc-shaped groove 1021, the straight groove 1023, the lower arc-shaped groove 1022, and the straight groove 1024 are sequentially connected end to form the closed first groove 102. It will be appreciated that when the coil is wound and fixed in the first groove 102, it may be installed, for example, starting from any one of the four segmented grooves, so that the winding is performed in a clockwise or counterclockwise direction.
Wherein the second groove 103 has the same structure as the first groove 102, and the first groove 102 and the second groove 103 are symmetrical about the central axis of the cylindrical shape.
Since the first groove 102 and the second groove 103 form a closed shape on the surface (side surface) of the cylindrical support, the direction of the magnetic field generated by the wound coil is perpendicular to the central axis of the cylinder, which meets the actual working requirements.
Further, the upper arc groove 1021 and the lower arc groove 1022 are symmetrical to each other; the straight groove 1023 and the straight groove 1024, which are connected to the adjacent ends of the upper arc-shaped groove and the lower arc-shaped groove, respectively, are symmetrical to each other.
It will be appreciated that the single recess is symmetrically shaped to facilitate rapid installation of the coils in a regular pattern to determine the direction of the magnetic field generated.
The size of the arc-shaped groove or the straight groove is determined according to the range formed by the coils to be installed.
Furthermore, a plurality of upper arc-shaped sub-grooves and a plurality of lower arc-shaped sub-grooves are respectively arranged in the upper arc-shaped groove and the lower arc-shaped groove; a plurality of straight sub-grooves are arranged in the straight grooves; the upper arc-shaped sub-grooves, the lower arc-shaped sub-grooves and the straight sub-grooves are respectively connected to form a plurality of sub-grooves; the plurality of sub-grooves are arranged at equal intervals in the first groove and/or the second groove.
Specifically, a plurality of sub-grooves having the same shape as each of the upper arc-shaped groove 1021, the lower arc-shaped groove 1022, the straight groove 1023, and the straight groove 1024 of the first groove 102 are respectively provided therein, so that the multi-turn coil can be fixed in each sub-groove. The second grooves 103 have the same structure.
On the basis of the above embodiments, another embodiment of the radio frequency coil device in the embodiment of the present application: the upper arc-shaped groove and the lower arc-shaped groove are respectively connected with the straight groove, and a distance is respectively extended from the upper arc-shaped groove, the lower arc-shaped groove and the straight groove for leading out a tail end lead-out wire of the coil.
Specifically, as shown by the circle in fig. 1, a small section of groove extends from the position where the ends of the upper arc-shaped groove 1021 and the straight groove 1023 are connected; similarly, the connection part between the upper arc-shaped groove 1021 and the straight groove 1024, or between the lower arc-shaped groove 1022 and the straight groove 1023, or between the lower arc-shaped groove 1022 and the straight groove 1024 can form an extending structure; the extended groove is used for accommodating the wire end reserved at the position where the coil winding starts or ends and is used for being connected and electrified with an external electrode or a power supply, or other outgoing wires can be jointed at the head end part and the tail end part of the coil winding, so that the outgoing wires are placed along the extended groove. The second grooves 103 have the same structure.
Referring to fig. 1 to 3, in the radio frequency coil device in the present embodiment, a coil is installed, the coil starts to be wound and fixed in the first groove 102, and after the coil is wound and fixed in the first groove 102, the coil continues to be wound and fixed in the second groove 103; the winding directions of the coils in the first groove 102 and the second groove 103 are the same; the magnetic fields generated by the coils in the first and second grooves 102 and 103 are in the same direction, and the direction of the magnetic field is perpendicular to the central axis of the cylinder.
Specifically, for example, a metal wire is wound from the first groove 102, and after a preset number of turns, the metal wire is pulled through the second groove 103 to start winding for the same number of turns, wherein a section of the head portion and a section of the tail portion of the metal wire are respectively reserved and placed in the extending structure, so as to be used for an external power supply. The two end lines of the reservation are preferably located on the same side.
It will be appreciated that the direction in which the coils are wound in the first and second slots 102 and 103 may be clockwise or counterclockwise, and it is necessary to ensure that the generated magnetic fields are in the same direction.
With continued reference to fig. 4, the coil wound in the first and second grooves 102 and 103 may have, for example, the shape as shown. The coil 20 includes a first coil 202 and a second coil 203 corresponding to the first recess 102 and the second recess 103, respectively. For example, the first coil 202 corresponds to the first groove 102, and the first groove 102 includes an upper arc-shaped groove 1021, a lower arc-shaped groove 1022, a straight groove 1023, and a straight groove 1024, so that the first coil 202 has the same shape as the first groove 102. As shown in fig. 2, the wires reserved at the head and tail ends of the coil or the external outgoing wires a and b can be supplied with current in the directions shown in the figure, so that the coil generates a magnetic field in the corresponding direction.
When the radio frequency coil device of the embodiment is used, the relationship between the excitation current introduced into the coil and the generated magnetic field strength can be calculated according to the magnetic permeability and the diameter of the coil material and the number of turns of the coil, so that when the radio frequency coil is applied, the strength of the magnetic field strength generated by the radio frequency coil can be obtained by knowing the strength of the excitation current.
In practical application, the size and direction of the magnetic field to be provided need to be determined, and the relationship between the introduced current and the generated magnetic field intensity is calculated and analyzed in advance, so that the size of the magnetic field intensity corresponding to the impressed current can be rapidly obtained in subsequent application, and a user can conveniently judge whether the magnetic field intensity meets the requirement.
One embodiment of the magnetometer of the embodiments of the present application: the magnetometer comprises a radio frequency coil device and an atom air chamber, wherein the radio frequency coil device comprises a coil support and a coil, a hollow cavity is formed in the inner surface of the coil support and is arranged to contain the atom air chamber, and the outer surface of the coil support is used for fixing the coil.
Specifically, the radio frequency coil device is used for bearing and fixing a radio frequency coil, namely, the radio frequency coil device is realized by a coil bracket; the coil support is hollow, the inner space of the coil support is used for placing an atomic gas chamber filled with a substance to be detected for generating magnetic resonance, and the outer surface of the coil support is used for fixing the coil and generating a magnetic field.
In order to avoid the coil support from occupying too large space, the coil support can be designed according to the shape and the size of the atomic gas chamber; the atomic gas chamber is arranged in the hollow chamber of the coil bracket, and the coil is arranged on the outer surface of the bracket, so that the coil provides a magnetic field for the substances in the inner space of the coil, and the requirement of magnetic resonance is met. The coil, the coil support and the atomic gas chamber, the structure becomes very compact as a whole.
The size of the coil support is flexibly set according to actual needs, and it can be understood that the coil support can be made of polytetrafluoroethylene and other materials as long as the material does not interfere with a magnetic field. Meanwhile, the coil support can be manufactured by adopting a 3D printing additive technology, and the coil support can be manufactured by adopting any technological means which can meet the requirements on the shape, the size and the like of the coil support.
Referring to fig. 1-3, another embodiment of a magnetometer in an embodiment of the present application: the magnetometer comprises a radio frequency coil device 100 and an atom gas chamber, wherein the atom gas chamber is cylindrical; the radio frequency coil device 100 comprises a coil support 10 and a coil, wherein a cylindrical hollow cavity 101 is formed on the inner surface of the coil support 10, and the hollow cavity 101 is arranged to accommodate an atomic gas chamber; a groove is formed on the outer surface of the coil support 10, and the groove is configured to fix the coil; the grooves include a first groove 102 and a second groove 103, and the first groove 102 and the second groove 103 are symmetrical with respect to a central axis of the cylindrical shape.
It can be understood that, a support used for bearing the coil is sleeved on the periphery of the common atomic gas chamber, the coil is arranged relative to the cylindrical side surface, and compared with the position of the existing radio frequency coil, the coil is closer to the outer surface of the atomic gas chamber, so that the size of the whole structure formed by the coil and the atomic gas chamber is reduced.
Furthermore, the first groove and the second groove respectively comprise an upper arc-shaped groove and a lower arc-shaped groove along the cylindrical circumferential direction, and the upper arc-shaped groove and the lower arc-shaped groove are respectively arranged close to the upper circumferential surface and the lower circumferential surface of the cylindrical outer surface of the coil support; the adjacent two ends of the upper arc-shaped groove and the lower arc-shaped groove are respectively connected through straight grooves, and the straight grooves are parallel to the direction of the cylindrical central axis.
Specifically, referring to fig. 1 and 2, the first groove 102 includes an upper arc-shaped groove 1021, a lower arc-shaped groove 1022, a straight groove 1023, and a straight groove 1024, wherein the upper arc-shaped groove 1021, the straight groove 1023, the lower arc-shaped groove 1022, and the straight groove 1024 are sequentially connected end to form the closed first groove 102. It will be appreciated that when the coil is wound and fixed in the first groove 102, it may be installed, for example, starting from any one of the four segmented grooves, so that the winding is performed in a clockwise or counterclockwise direction.
Wherein the second groove 103 has the same structure as the first groove 102, and the first groove 102 and the second groove 103 are symmetrical about the central axis of the cylindrical shape.
On the basis of the above embodiment, referring to fig. 1, another embodiment of the magnetometer in the embodiment of the present application: the outer surface of the coil support 10 is provided with a side opening 104, the side opening 104 is parallel to the central axis direction of the cylinder, and the side opening 104 is positioned between two adjacent straight grooves of the first groove 102 and the second groove 103; the side openings 104 are configured to receive protruding portions of the atomic gas cell.
Specifically, the atomic cell generally has a side edge projection, and in order to conform to the shape of the atomic cell, the coil support 10 has a side edge opening 104 for extending the projection from the side edge opening 104; meanwhile, the side openings 104 enable the coil support 10 to be properly stretched when being sleeved on the atomic gas chamber, for example, when the support is made of soft material, so that the structures on the two sides of the openings 104 can be conveniently installed.
It is understood that the shape of the side openings 104 may be rectangular openings as shown in FIG. 1, or may be other shapes as long as they are compatible with the protruding portions of the atomic gas cell.
In the magnetometer of the embodiment, the coil support is sleeved on the surface of the atomic gas chamber, and the coil is embedded in the groove on the surface of the support, so that the combination is adopted, and the miniaturization of the configuration of the magnetometer is realized.
It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (11)
1. A radio frequency coil device comprises a coil support and a coil, wherein,
the inner surface of the coil support forms a hollow cavity, the hollow cavity is used for accommodating an atomic air chamber, the shape and the size of the hollow cavity are matched with those of the atomic air chamber, and the outer surface of the coil support is used for fixing the coil;
the coil support is characterized in that a groove is formed in the outer surface of the coil support and is used for fixing the coil, a cylindrical hollow cavity is formed in the inner surface of the coil support, the groove comprises an upper arc-shaped groove and a lower arc-shaped groove along the cylindrical circumferential direction, the upper arc-shaped groove and the lower arc-shaped groove are respectively arranged close to the upper circumferential surface and the lower circumferential surface of the cylindrical outer surface of the coil support, the two adjacent ends of the upper arc-shaped groove and the lower arc-shaped groove are respectively connected through a straight groove, and the straight groove is parallel to the direction of the cylindrical central axis; the direction of the magnetic field generated by the coil is vertical to the central axis of the coil support.
2. The radio frequency coil device as set forth in claim 1,
the interior of the groove comprises a plurality of sub-grooves, and the shapes of the sub-grooves are the same as those of the groove;
the distance between every two adjacent sub-grooves of the plurality of sub-grooves is the same;
and the coil is sequentially wound and arranged in the plurality of sub-grooves to form a multi-turn coil.
3. The radio frequency coil device as set forth in claim 1,
the number of the grooves is two, the grooves are respectively a first groove and a second groove, and the first groove and the second groove are symmetrical relative to a cylindrical central axis.
4. The radio frequency coil device as set forth in claim 1,
the upper arc-shaped groove and the lower arc-shaped groove are symmetrical; and the straight grooves which are respectively connected with the two adjacent ends of the upper arc-shaped groove and the lower arc-shaped groove are mutually symmetrical.
5. The radio frequency coil device as set forth in claim 3,
a plurality of upper arc-shaped sub-grooves and lower arc-shaped sub-grooves are respectively arranged in the upper arc-shaped groove and the lower arc-shaped groove;
a plurality of straight sub-grooves are arranged in the straight grooves;
the upper arc-shaped sub-grooves, the lower arc-shaped sub-grooves and the straight sub-grooves are respectively connected to form a plurality of sub-grooves;
the plurality of sub-grooves are arranged at equal intervals in the first groove and/or the second groove.
6. The radio frequency coil device as set forth in claim 1,
the upper arc-shaped groove and the lower arc-shaped groove are respectively connected with the straight groove, and a distance is respectively extended from the upper arc-shaped groove, the lower arc-shaped groove and the straight groove to be used for leading out a tail end lead-out wire of the coil.
7. The radio frequency coil device according to claim 3 or 5,
the coil starts to be wound and fixed in the first groove, and continues to be wound and fixed in the second groove after the coil is wound and fixed in the first groove;
the winding directions of the coils in the first groove and the second groove are the same;
the magnetic field directions generated by the coils in the first groove and the second groove are the same, and the magnetic field directions are perpendicular to the central axis of the cylinder.
8. The radio frequency coil device as set forth in claim 1,
and calculating the relation between the excitation current introduced into the coil and the generated magnetic field intensity according to the magnetic permeability and the diameter of the coil material and the number of turns of the coil, so that when the radio frequency coil is applied, the size of the magnetic field intensity generated by the radio frequency coil can be obtained by knowing the size of the excitation current.
9. A magnetometer comprises a radio frequency coil device and an atomic gas cell, wherein,
the radio frequency coil device comprises a coil support and a coil, wherein a hollow cavity is formed on the inner surface of the coil support and is arranged to accommodate the atomic air chamber, the shape and the size of the hollow cavity are matched with those of the atomic air chamber, and the outer surface of the coil support is used for fixing the coil;
the coil support is characterized in that a groove is formed in the outer surface of the coil support and is used for fixing the coil, a cylindrical hollow cavity is formed in the inner surface of the coil support, the groove comprises an upper arc-shaped groove and a lower arc-shaped groove along the cylindrical circumferential direction, the upper arc-shaped groove and the lower arc-shaped groove are respectively arranged close to the upper circumferential surface and the lower circumferential surface of the cylindrical outer surface of the coil support, the two adjacent ends of the upper arc-shaped groove and the lower arc-shaped groove are respectively connected through a straight groove, and the straight groove is parallel to the direction of the cylindrical central axis; the direction of the magnetic field generated by the coil is vertical to the central axis of the coil support.
10. A magnetometer comprises a radio frequency coil device and an atomic gas cell, wherein,
the atomic gas chamber is cylindrical;
the radio frequency coil device comprises a coil support and a coil, wherein a cylindrical hollow cavity is formed on the inner surface of the coil support and is arranged to accommodate the atomic gas chamber, and the shape and the size of the hollow cavity are matched with those of the atomic gas chamber;
a groove is formed on the outer surface of the coil support and is used for fixing the coil;
the grooves comprise a first groove and a second groove, and the first groove and the second groove are symmetrical relative to the central axis of the cylinder;
the first groove and the second groove respectively comprise an upper arc-shaped groove and a lower arc-shaped groove along the cylindrical circumferential direction, and the upper arc-shaped groove and the lower arc-shaped groove are respectively arranged close to the upper circumferential surface and the lower circumferential surface of the cylindrical outer surface of the coil support; the two adjacent ends of the upper arc-shaped groove and the lower arc-shaped groove are respectively connected through a straight groove, and the straight groove is parallel to the direction of the central axis of the cylinder; the direction of the magnetic field generated by the coil is vertical to the central axis of the coil support.
11. The magnetometer of claim 10, wherein,
the outer surface of the coil support is provided with a side opening, the side opening is parallel to the direction of the central axis of the cylinder, and the side opening is positioned between two adjacent straight grooves of the first groove and the second groove; the side openings are configured to receive protruding portions of the atomic gas cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911112269.8A CN110764030B (en) | 2019-11-14 | 2019-11-14 | Radio frequency coil device of optical pump magnetometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911112269.8A CN110764030B (en) | 2019-11-14 | 2019-11-14 | Radio frequency coil device of optical pump magnetometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110764030A CN110764030A (en) | 2020-02-07 |
| CN110764030B true CN110764030B (en) | 2021-03-09 |
Family
ID=69337718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911112269.8A Active CN110764030B (en) | 2019-11-14 | 2019-11-14 | Radio frequency coil device of optical pump magnetometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110764030B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111785493B (en) * | 2020-07-30 | 2024-06-18 | 上海华虹宏力半导体制造有限公司 | Radio frequency coil device and polysilicon etching machine |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3004211A (en) * | 1957-10-14 | 1961-10-10 | Varian Associates | Atomic precession magnetometers |
| US5192911A (en) * | 1991-08-07 | 1993-03-09 | Varian Associates, Inc. | NMR probe incorporating RF shielding of sample |
| US7872473B2 (en) * | 2007-08-07 | 2011-01-18 | The United States of America as represented by the Secretary of Commerce, the National Institute of Standards and Technology | Compact atomic magnetometer and gyroscope based on a diverging laser beam |
| CN104755950B (en) * | 2012-10-25 | 2019-03-22 | 皇家飞利浦有限公司 | Radio frequency (RF) birdcage coils with the annular construction member and crosspiece individually controlled used in magnetic resonance (MR) imaging system |
| CN103412268B (en) * | 2013-08-07 | 2015-10-28 | 北京航空航天大学 | A kind of single beam unmasked atom magnetometer and detection method thereof |
| CN105527594B (en) * | 2014-10-23 | 2018-08-28 | 北京自动化控制设备研究所 | A kind of big homogeneity range three-dimensional magnetic coil and its manufacturing method |
| CN106024260B (en) * | 2016-07-12 | 2018-02-09 | 北京航天控制仪器研究所 | A kind of two coil configuration for the control of magnetic resonance gyroscope high accuracy magnetic field |
| CN109613455A (en) * | 2018-12-04 | 2019-04-12 | 北京昆迈生物医学研究院有限公司 | A kind of atom magnetometer and application method based on light field Yu magnetic field complex modulated |
-
2019
- 2019-11-14 CN CN201911112269.8A patent/CN110764030B/en active Active
Non-Patent Citations (2)
| Title |
|---|
| StructuralandroomtemperatureferromagneticpropertiesofNidoped;KunXu等;《Physica B》;20161231;全文 * |
| 数字化铷光泵磁力仪的设计;杨月芳;《中国优秀硕士学位论文全文数据库基础科学辑》;20130315(第3期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110764030A (en) | 2020-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101995559B (en) | Triaxial fluxgate probe | |
| US7501826B2 (en) | Dividing wall separating the RF antenna from the patient chamber in an MR scanner | |
| CN110764030B (en) | Radio frequency coil device of optical pump magnetometer | |
| US9476952B2 (en) | Structure of measuring iron loss of motor stator core | |
| WO2008104894A3 (en) | Sinusoidally resonant radio frequency volume coils for high field magnetic resonance applications | |
| US20070018647A1 (en) | Nuclear magnetic resonance apparatus with a gradient shielding configuration having reduced coupling to the resonator system | |
| KR20160031333A (en) | ROGOWSKI COIL and current measurement sensor using the same | |
| JPH06168833A (en) | Current and voltage converter for metal- encapsulated and gas-insulated high- voltage apparatus | |
| CN106841264B (en) | A kind of nmr sensor for detecting composite insulator umbrella skirt | |
| GB2400913A (en) | Gradient Coils and Method of Manufacturing Gradient Coils for MRT Systems | |
| US4388601A (en) | Symmetrizing means for RF coils in a microwave cavity | |
| CN106200354A (en) | A kind of optical-fiber type CPT atomic clock physical system | |
| US20160233734A1 (en) | Slotless electrical machine with concentrated winding | |
| US20140347054A1 (en) | Magnetic Resonance System with Whole-Body Transmitting Array | |
| US20180366269A1 (en) | Ignition coil for internal-combustion engine | |
| CN101777411B (en) | Magnetizing device | |
| US10989772B2 (en) | TEM resonator-type RF antenna device for a magnetic resonance imaging system | |
| CN105424022A (en) | Magnetic field coil structure of nuclear magnetic resonance gyro | |
| JP2006006689A (en) | Uniform magnetic field generator | |
| JPS6050043B2 (en) | coil structure | |
| JP2009271042A (en) | Probe for continuous wave hf band magnetic resonance apparatus detector | |
| CN217690682U (en) | Electromagnetic coil structure and adjustable damping device | |
| CN220253021U (en) | PFC inductance component and switching power supply | |
| US20240168064A1 (en) | Dual-channel current sensor | |
| JPH10300795A (en) | Dc current sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |