CN110568383B - Magnetic field detection device based on magnetocaloric effect - Google Patents
Magnetic field detection device based on magnetocaloric effect Download PDFInfo
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- CN110568383B CN110568383B CN201910986272.6A CN201910986272A CN110568383B CN 110568383 B CN110568383 B CN 110568383B CN 201910986272 A CN201910986272 A CN 201910986272A CN 110568383 B CN110568383 B CN 110568383B
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- 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
Abstract
The invention relates to a magnetic field detection device and system based on a magnetocaloric effect, in particular to the field of magnetic field measurement. A plurality of ferromagnetic unit one end in this application is provided with graphite alkene layer, first electrode and second electrode set up the both ends of keeping away from one side of a plurality of ferromagnetic units at graphite alkene layer respectively, after first electrode and second electrode circular telegram, place the region of awaiting measuring with this magnetic field detector, magnetic field makes ferromagnetic unit magnetized, in ferromagnetic unit by the in-process of magnetization because the magnetocaloric effect, make the temperature of this ferromagnetic unit can rise, and give graphite alkene layer with the temperature transfer, the temperature of this graphite alkene layer obtains changing, and then change the thermal noise on this graphite alkene layer, through the situation of change that detects this graphite alkene layer temperature, and according to the relation of graphite alkene layer temperature change and thermal noise, just can obtain the thermal noise of graphite alkene this moment, just can directly obtain the magnetic field size of this region of awaiting measuring according to the corresponding relation in thermal noise and magnetic field.
Description
Technical Field
The invention relates to the field of magnetic field measurement, in particular to a magnetic field detection device based on a magnetocaloric effect.
Background
The magnetic field is a special invisible and untouchable substance, is not composed of atoms or molecules, but objectively exists. The magnetic field has the radiation characteristics of a wave particle. The magnetic field exists around the magnets, and the interaction between the magnets is mediated by the magnetic field, so that the two magnets can act without being in contact with each other on a physical layer. Current, moving charge, magnets or a special form of matter present in the space surrounding the changing electric field.
In the prior art, generally, a magnetic field is converted into a current, and then a magnetic field corresponding to a measured current is obtained according to a corresponding relationship between the current and the magnetic field.
However, the above method for measuring a magnetic field may cause a certain loss in the process of converting the magnetic field into a current, so that the measurement of the magnetic field is inaccurate.
Disclosure of Invention
The invention aims to provide a magnetic field detection device based on a magnetocaloric effect to solve the problem that the magnetic field measurement is inaccurate due to certain loss in the process of converting the magnetic field into current in the method for measuring the magnetic field in the prior art.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a magnetic field detector based on a magnetocaloric effect, where the magnetic field detector includes: a plurality of ferromagnetic elements, a graphene layer, a first electrode, and a second electrode; one ends of the ferromagnetic units are provided with graphene layers, and the first electrode and the second electrode are respectively arranged at two ends of one side, away from the ferromagnetic units, of the graphene layers.
Optionally, the magnetic field detector further comprises a filling layer filled between the plurality of ferromagnetic units.
Optionally, the material of the filling layer is graphene.
Optionally, the graphene layer includes a plurality of strip-shaped graphene structures.
Optionally, the magnetic field detector further comprises: the first magnet and the second magnet are respectively arranged at one end, close to and far away from the ferromagnetic unit, of the graphene layer.
Optionally, one end of each of the first magnet and the second magnet, which is close to the graphene layer, is provided with a rough surface.
Optionally, the magnetic field detector further comprises an aerogel layer, and the aerogel layer is arranged at one end of the graphene layer close to the first electrode and the second electrode.
Optionally, the material of the ferromagnetic element comprises: at least one of iron, cobalt, nickel and manganese.
Optionally, the magnetic field detector further comprises a noble metal particle layer, and the noble metal particle layer is arranged on one side of the graphene layer close to the first electrode and the second electrode.
In a second aspect, an embodiment of the present invention further provides another magnetic field detection system based on a magnetocaloric effect, where the magnetic field detection system includes: the temperature detection device is arranged on a graphene layer of the magnetic field detector and used for detecting the temperature of the graphene layer.
The invention has the beneficial effects that:
a plurality of ferromagnetic unit one end in this application is provided with graphite alkene layer, first electrode and second electrode set up the both ends of keeping away from one side of a plurality of ferromagnetic units at graphite alkene layer respectively, after first electrode and second electrode circular telegram, place the region of awaiting measuring with this magnetic field detector, magnetic field makes ferromagnetic unit magnetized, in ferromagnetic unit by the in-process of magnetization because the magnetocaloric effect, make the temperature of this ferromagnetic unit can rise, and give graphite alkene layer with the temperature transfer, the temperature of this graphite alkene layer obtains changing, and then change the thermal noise on this graphite alkene layer, through the situation of change that detects this graphite alkene layer temperature, and according to the relation of graphite alkene layer temperature change and thermal noise, just can obtain the thermal noise of graphite alkene this moment, just can directly obtain the magnetic field size of this region of awaiting measuring according to the corresponding relation in thermal noise and magnetic field.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a magnetic field detector based on a magnetocaloric effect according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another magnetic field detector based on the magnetocaloric effect according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another magnetic field detector based on the magnetocaloric effect according to an embodiment of the present invention.
Icon: 10-a ferromagnetic element; 20-a graphene layer; 30-a first electrode; 40-a second electrode; 50-a filler layer; 60-aerogel layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a schematic structural diagram of a magnetic field detector based on a magnetocaloric effect according to an embodiment of the present invention, and as shown in fig. 1, the embodiment of the present invention provides a magnetic field detector based on a magnetocaloric effect, where the magnetic field detector includes: a plurality of ferromagnetic elements 10, a graphene layer 20, a first electrode 30 and a second electrode 40; one end of each ferromagnetic unit 10 is provided with a graphene layer 20, and the first electrode 30 and the second electrode 40 are respectively arranged at two ends of one side of the graphene layer 20 far away from the plurality of ferromagnetic units 10.
The graphene layer 20 is disposed on the plurality of ferromagnetic units 10, the first electrode 30 and the second electrode 40 are respectively disposed at two ends above the graphene layer 20, the volume of the graphene layer 20 is set according to actual conditions, and no limitation is made herein, when the first electrode 30 and the second electrode 40 are connected to a power supply, the graphene layer 20 is equivalent to a conductor with a certain resistance, the number of the ferromagnetic units 10 is selected according to actual conditions, and no unnecessary limitation is made herein, when the first electrode 30 and the second electrode 40 are powered on, the magnetic field detector is placed in a region to be tested, the ferromagnetic units 10 are magnetized by a magnetic field, and due to a magnetocaloric effect in a process of magnetizing the ferromagnetic units 10, the temperature of the ferromagnetic units 10 can be increased, and the temperature is transferred to the graphene layer 20, the temperature of the graphene layer 20 is changed, so as to change thermal noise on the graphene layer 20, by detecting the temperature change of the graphene layer 20 and according to the relationship between the temperature change of the graphene layer 20 and the thermal noise, the thermal noise of the graphene at the moment can be obtained, and the magnetic field size of the region to be detected can be directly obtained according to the corresponding relationship between the thermal noise and the magnetic field.
Optionally, the magnetic field detector is generally disposed at a central position of the magnetic field to be detected, and a plurality of magnetic field detectors may be disposed in the magnetic field detector, so that the detection of the magnetic field to be detected is more accurate.
Optionally, the specific shape of the graphene layer 20 is selected according to actual situations, generally, the graphene layer 20 may be rectangular or "V" shaped, when the graphene layer 20 is "V" shaped (not shown in the drawings), the structure formed by the plurality of magnet units also has a "V" shaped groove corresponding to the "V" shaped structure, the "V" shaped graphene layer 20 is disposed in the "V" shaped groove, the "V" shaped graphene layer 20 is tightly attached to the inner wall of the "V" shaped groove, the contact area between the "V" shaped graphene layer 20 and the ferromagnetic unit 10 is increased, so that heat generated by the ferromagnetic unit 10 can be transferred to the "V" shaped graphene layer 20 as much as possible, and the heat is easily concentrated at the bottom of the "V" shaped groove, where the singular point of the "V" shaped graphene layer 20 and the "V" shaped groove is also, more heat acts on the structural singular point, the influence on thermal noise is larger, and the sensitivity of magnetic field detection is improved.
The term "johnson noise," known as thermal noise or white noise, is explained by the thermal shock of electrons in a conductor, which is present in all electronic devices and transmission media. It is the result of temperature changes, but is not affected by frequency changes. Thermal noise is distributed in the same pattern across all frequency spectra and cannot be removed, thereby placing an upper limit on communication system performance.
The johnson noise is calculated as follows:
Vn＝4KTRB∧0.5
wherein K is Boltzmann constant (1.38x10^ -23J/K), T is the temperature of the resistor, B is the bandwidth, and R is the resistance of the resistor.
Fig. 2 is a schematic structural diagram of another magnetic field detector based on the magnetocaloric effect according to an embodiment of the present invention, as shown in fig. 2, the magnetic field detector further includes a filling layer 50, and the filling layer 50 is filled between the plurality of ferromagnetic units 10.
A plurality of the ferromagnetic units 10 are magnetized by a magnetic field, and due to the magnetocaloric effect, the plurality of ferromagnetic units 10 generate a certain amount of heat and transfer the heat to the graphene layer 20, and in order to reduce the heat loss when the heat is transferred from the plurality of ferromagnetic units 10 to the graphene layer 20, a filling layer 50 is filled between the plurality of ferromagnetic materials.
Optionally, the material of the filling layer 50 is graphene.
The graphene filling layer 50 may be a structure integrated with the graphene layer 20, or may be another structure made of graphene and connected to the graphene layer 20, which is not specifically limited herein, and it should be noted that when the filling layer 50 is integrated with the graphene layer 20, a plurality of ferromagnetic units 10 are embedded in the filling layer 50.
Optionally, the graphene layer 20 includes a plurality of strip-shaped graphene structures.
The graphene layer 20 is provided at an intermediate position thereof with a plurality of strip-shaped graphene structures, and the strip-shaped graphene structures are not in contact with the first electrode 30 and the second electrode 40.
Optionally, the magnetic field detector further comprises: first and second magnets (not shown) disposed at ends of the graphene layer 20 near and far from the ferromagnetic unit 10, respectively.
If the first magnet is disposed on the side of the graphene layer 20 close to the ferromagnetic unit 10, the second magnet is disposed on the side of the graphene layer 20 away from the ferromagnetic unit 10; if this first magnet setting is kept away from ferromagnetic unit 10 in one side of this graphite alkene layer 20, then this second magnet setting is close to this ferromagnetic unit 10 in one side of this graphite alkene layer 20, and this first magnet and this second magnet tighten this graphite alkene layer 20, are favorable to this graphite alkene layer 20 to the absorption in magnetic field for this graphite alkene layer 20 is more sensitive to the change in magnetic field.
Optionally, one end of each of the first magnet and the second magnet near the graphene layer 20 is provided with a rough surface.
If the first magnet is disposed on one side of the graphene layer 20 close to the ferromagnetic unit 10, the second magnet is disposed on one side of the graphene layer 20 far away from the ferromagnetic unit 10, the lower end of the first magnet is a rough surface, and the upper end of the second magnet is a rough surface; if this first magnet setting is in the one side that ferromagnetic unit 10 was kept away from to this graphite alkene layer 20, then this second magnet setting is in the one side that this graphite alkene layer 20 is close to this ferromagnetic unit 10, then the upper end of this first magnet is the mat surface, the lower extreme of this second magnet is the mat surface, a face that this first magnet and second magnet are close to this graphite alkene layer 20 promptly is the mat surface, the mat surface contacts with graphite alkene layer 20 for a plurality of singularities have been formed between this first magnet and second magnet and graphite alkene layer 20, the influence of reinforcing temperature variation to thermal noise.
Fig. 3 is a schematic structural diagram of another magnetic field detector based on the magnetocaloric effect according to an embodiment of the present invention, as shown in fig. 3, the magnetic field detector further includes an aerogel layer 60, and the aerogel layer 60 is disposed at an end of the graphene layer 20 close to the first electrode 30 and the second electrode 40.
This application uses the temperature of graphite alkene layer 20 and the relation of thermal noise to obtain this thermal noise, if the heat transfer that this ferromagnetic unit 10 produced when this graphite alkene layer 20, this graphite alkene layer 20's heat loss, can cause the thermal noise that the calculation obtained inaccurate, and then make the magnetic field that the measurement obtained also inaccurate, then can be close to this graphite alkene layer 20 and this first electrode 30 and the one side of second electrode 40 at set up aerogel layer 60, this aerogel layer 60 can completely cut off thermal scattering and disappearing, make the measurement to the magnetic field more accurate.
Optionally, the material of the ferromagnetic element 10 includes: at least one of iron, cobalt, nickel and manganese.
The ferromagnetic element 10 may be made of: any one of the elementary metal materials of iron, cobalt, nickel and manganese can be: the specific material of the ferromagnetic unit 10 is selected according to actual conditions, and is not limited in particular.
Optionally, the magnetic field detector further comprises a layer of noble metal particles (not shown in the figure) disposed on a side of the graphene layer 20 adjacent to the first electrode 30 and the second electrode 40.
The layer of noble metal particles provided on the magnetic field detector helps the graphene layer 20 absorb heat, so that the magnetic field detector can measure the magnetic field more accurately.
In the present application, one end of each of the plurality of ferromagnetic elements 10 is provided with a graphene layer 20, the first electrode 30 and the second electrode 40 are respectively disposed at two ends of one side of the graphene layer 20 away from the plurality of ferromagnetic elements 10, when the first electrode 30 and the second electrode 40 are energized, the magnetic field detector is placed in the region to be measured, the magnetic field causes the ferromagnetic element 10 to be magnetized, during the process of magnetizing the ferromagnetic unit 10, due to the magnetocaloric effect, the temperature of the ferromagnetic unit 10 will increase, and the temperature will be transferred to the graphene layer 20, the temperature of the graphene layer 20 is changed, thereby changing the thermal noise on the graphene layer 20, the thermal noise of the graphene can be obtained by detecting the temperature change of the graphene layer 20 and according to the relationship between the temperature change of the graphene layer 20 and the thermal noise, the magnetic field size of the region to be measured can be directly obtained according to the corresponding relation between the thermal noise and the magnetic field.
The embodiment of the invention also provides another magnetic field detection system based on the magnetocaloric effect, and the magnetic field detection system comprises: temperature-detecting device and the magnetic field detector of any above-mentioned, temperature-detecting device sets up on graphite alkene layer 20 of magnetic field detector for detect graphite alkene layer 20's temperature.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A magnetic field detector based on the magnetocaloric effect, characterized in that it comprises: a plurality of ferromagnetic elements, a graphene layer, a first electrode, and a second electrode;
the graphene layer is arranged at one end of each ferromagnetic unit, and the first electrode and the second electrode are respectively arranged at two ends of one side, far away from the ferromagnetic units, of the graphene layer;
the magnetic field detector further comprises a temperature detection device, the temperature detection device is arranged on the graphene layer of the magnetic field detector and used for detecting the temperature of the graphene layer, thermal noise of graphene is obtained according to the relation between the temperature change of the graphene layer and the thermal noise, and the size of a magnetic field of a region to be detected is directly obtained according to the corresponding relation between the thermal noise and the magnetic field.
2. The magnetocaloric effect-based magnetic field detector according to claim 1, further comprising a filling layer filled between the plurality of ferromagnetic units.
3. The magnetic field detector based on magnetocaloric effect according to claim 2, characterized in that the material of the filling layer is graphene.
4. The magnetocaloric effect-based magnetic field detector according to claim 1, wherein the graphene layer comprises a plurality of strip-shaped graphene structures.
5. The magnetic field detector based on the magnetocaloric effect according to claim 1, characterized in that it further comprises: the first magnet and the second magnet are respectively arranged at one end, close to and far away from the ferromagnetic unit, of the graphene layer.
6. The magnetic field detector based on the magnetocaloric effect according to claim 5, wherein one end of each of the first magnet and the second magnet near the graphene layer is provided with a rough surface.
7. The magnetocaloric effect-based magnetic field detector according to claim 5, further comprising an aerogel layer disposed at an end of the graphene layer adjacent to the first and second electrodes.
8. Magnetic field detector according to claim 1, characterized in that the material of said ferromagnetic element comprises: at least one of iron, cobalt, nickel and manganese.
9. The magnetocaloric effect-based magnetic field detector according to claim 1, further comprising a layer of noble metal particles disposed on a side of the graphene layer adjacent to the first and second electrodes.
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| CN103792501A (en) * | 2014-01-22 | 2014-05-14 | 中国人民解放军国防科学技术大学 | Bridge connection type graphene-based magnetic sensor |
| US10030896B1 (en) * | 2011-11-30 | 2018-07-24 | EMC IP Holding Company, LLC | Magneto-caloric cooling system |
| CN109817802A (en) * | 2019-01-25 | 2019-05-28 | 华中科技大学 | Based on multilayer-single-layer graphene knot terahertz detector and preparation method |
| CN109991271A (en) * | 2019-04-08 | 2019-07-09 | 包头稀土研究院 | Specimen holder, the magnetothermal effect measuring instrument with reference temperature and measurement method |
| CN109991270A (en) * | 2019-04-08 | 2019-07-09 | 包头稀土研究院 | Magnetothermal effect measuring instrument temperature sensor fixing means |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10030896B1 (en) * | 2011-11-30 | 2018-07-24 | EMC IP Holding Company, LLC | Magneto-caloric cooling system |
| CN103792501A (en) * | 2014-01-22 | 2014-05-14 | 中国人民解放军国防科学技术大学 | Bridge connection type graphene-based magnetic sensor |
| CN109817802A (en) * | 2019-01-25 | 2019-05-28 | 华中科技大学 | Based on multilayer-single-layer graphene knot terahertz detector and preparation method |
| CN109991271A (en) * | 2019-04-08 | 2019-07-09 | 包头稀土研究院 | Specimen holder, the magnetothermal effect measuring instrument with reference temperature and measurement method |
| CN109991270A (en) * | 2019-04-08 | 2019-07-09 | 包头稀土研究院 | Magnetothermal effect measuring instrument temperature sensor fixing means |
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