A magnetic field sensor based on electromagnetically conductive fluid and its system

Abstract

A magnetic field sensor based on an electromagnetically conductive fluid and its system relate to the technical field of magnetic field sensors and include: a housing, a sensing device, an output device, and a control system. The top of the housing is oriented toward the direction of the magnetic field. Under the action of the magnetic force, the electromagnetically conductive fluid inside the capsule of the sensing component moves toward a first connection cover, squeezing the upper portion of the capsule to expand beyond the exterior and contracting the middle portion of the capsule. A first electrode and a second electrode are electrically connected at the input end of a current detection module to detect the current in the loop, and the detected current is input to a controller. A current data acquisition module obtains the current value input to the controller by the current detection module. A current magnetic field conversion module calculates the obtained current value and converts it into a magnetic force magnitude value. An output module outputs the obtained magnetic force magnitude value to a display screen for display. This solves the problem that there is no magnetic field sensor based on an electromagnetically conductive fluid in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic field sensors, and in particular to a magnetic field sensor based on an electromagnetically conductive fluid and a system thereof. Background Art

[0002] Magnetic fields are ubiquitous in our daily lives, providing a variety of conveniences. However, magnetic fields also have numerous impacts on our lives. For example, excessive magnetic fields can be harmful to human health, and electromagnetic fields can affect the proper operation of complex, high-precision intelligent electronic devices. Therefore, accurately measuring the magnitude of magnetic fields is of great importance. In recent years, magnetic field sensing technology has seen significant development, finding widespread applications in fields such as biomedicine, power systems, and defense. For example, in medicine, magnetic field sensors can be used to detect subtle magnetic field variations generated by human organs, enabling diagnosis of illnesses. In industrial production, magnetic field sensors can detect the magnitude of magnetic fields to prevent excessive magnetic fields from affecting instruments and the human body. In geological exploration, magnetic field sensors can reveal geological structures and resource distribution by detecting magnetic anomalies in rocks and other materials. In the military and defense sector, magnetic field sensors are used for magnetic minesweeping and geomagnetic navigation. Furthermore, archaeology, space magnetic field detection, earthquake prediction, and the development of industrial intelligence all rely heavily on magnetic field sensing technology. Numerous types of magnetic field sensors exist, each employing different measurement principles. Each sensor based on these principles has its own advantages and disadvantages, and its application scenarios vary. Initial magnetic field sensors mainly include induction coil sensors, fluxgate sensors, magnetoresistive sensors, and Hall sensors, etc. These magnetic field sensors have a series of disadvantages, such as complex structure, high cost, poor adaptability, and small dynamic range.

[0003] Magnetic field sensors based on magnetic materials are an important type of magnetic field sensor. Their core component is the magnetic material. Under the influence of a magnetic field, the magnetic material undergoes physical changes such as mechanical deformation, which in turn changes other properties, which can be converted into changes in the magnetic field. For example, a fiber-optic magnetic field sensor based on magnetic fluid is an optical sensor. Its operating mechanism can be simply understood as a refractive index sensor that captures changes in the refractive index of the magnetic fluid under the influence of a magnetic field. By processing this optical signal, changes in the magnetic field can be sensed. In addition to optical signals, electrical signals are another easy-to-process signal. Therefore, magnetic field sensors based on electrical signals are simple and efficient sensors.

[0004] Magnetic fluid, also known as ferrofluid, magnetic fluid, magnetic colloid, or magnetic liquid, is a stable colloidal system composed of nanoscale magnetic particles coated with a surfactant, uniformly dispersed in a carrier liquid. It possesses the magnetic properties of solid magnetic materials and the fluidity of liquids, making it a novel functional material. The microstructure of magnetic fluid consists of three components: magnetic particles, a carrier liquid, and a surfactant. Because magnetic fluids possess the fluidity of liquids and the magnetism of solids, they exhibit many unique magnetic, optical, and electrical phenomena, such as the Faraday effect, birefringence, and linear dichroism. These properties hold great promise for applications in optical modulation, optical switches, optical isolators, and sensors.

[0005] By adding a conductive material to a magnetic fluid, a magnetically conductive fluid can be created that possesses both magnetic properties and electrical conductivity. Enclosed in an elastic capsule, the magnetically conductive fluid is susceptible to mechanical deformation under the influence of a magnetic field. This mechanical deformation causes a change in its resistance. When a certain voltage is applied, this change manifests as an electrical signal, which can be analyzed to reveal changes in the magnetic field. However, to date, there have been no reports of magnetic field sensors based on magnetically conductive fluids. Summary of the Invention

[0006] An embodiment of the present invention provides a magnetic field sensor based on an electromagnetically conductive fluid and a system thereof. By adopting an induction device based on the electromagnetically conductive fluid, currents of different intensities corresponding to different magnetic field environments are output. The magnitude of the magnetic field force is obtained by analyzing the output current rheology, thereby realizing the detection of the magnetic force magnitude of the magnetic field. The overall structure is simple and the cost is low, which solves the problem that there is no magnetic field sensor based on electromagnetically conductive fluid in the prior art.

[0007] A magnetic field sensor based on an electromagnetically conductive fluid comprises: a housing;

[0008] An induction device, comprising a device housing, a fixing device, an induction component, and a connecting device;

[0009] The device housing is disposed on one side of the interior of the outer shell, a cavity is disposed inside the device housing, an air hole is provided on one side of the device housing and communicates with the interior of the cavity, the fixing device is disposed inside the cavity, the sensing component is disposed inside the fixing device, and one end of the connecting device is sequentially connected to the device housing, the fixing device, and the sensing component;

[0010] An output device is electrically connected to the other end of the connecting device, and is used to output a numerical value of the magnetic force.

[0011] Furthermore, the fixing device includes a first fixing plate, a second fixing plate, a first connecting cover, a second connecting cover, a connecting ring and a limiting sleeve, the first fixing plate and the second fixing plate are respectively arranged at the upper and lower parts of the inside of the cavity, the first connecting cover is arranged at the bottom of the first fixing plate, the second connecting cover is arranged at the top of the second fixing plate, the limiting sleeve is arranged at the top of the second connecting cover, the limiting sleeve is arranged at the top of the limiting sleeve, and the limiting sleeve is connected to the inner wall of the cavity.

[0012] Furthermore, the induction component includes a capsule and an electromagnetically conductive fluid, the capsule is elliptical in shape, the electromagnetically conductive fluid is filled inside the capsule, the top of the capsule is fixedly connected to the bottom of the first connecting cover, the bottom of the capsule is fixedly connected to the top of the second connecting cover, the surface of the capsule is fixedly connected to the connecting ring, and the surface of the capsule is in contact with the surface of the limiting sleeve.

[0013] Furthermore, the capsule is made of elastic material.

[0014] Furthermore, the connecting device includes a first electrode and a second electrode, the first electrode includes a first metal electrode, a second metal electrode, a connecting wire and a connecting sleeve, the connecting sleeve is connected through the device shell and the limit sleeve, the first metal electrode is arranged on one side of the inner wall of the capsule, and the second metal electrode is arranged at the end of the connecting sleeve away from the capsule, and the first metal electrode and the second metal electrode are electrically connected through the connecting wire.

[0015] Furthermore, the second electrode has the same structure as the first electrode, and the first electrode and the second electrode are arranged in a mirror image.

[0016] Furthermore, the output device includes a current detection module, a controller and a display screen, the display screen is arranged on the surface of the shell, the current detection module and the controller are arranged in sequence on the other side of the interior of the shell, the first electrode and the second electrode are respectively electrically connected to the input end of the current detection module, the first electrode and the second electrode are also respectively connected to the positive and negative poles of the power supply, the output end of the current detection module is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the input end of the display screen.

[0017] In a second aspect, an embodiment of the present invention provides a magnetic field sensor system based on a conductive magnetic fluid, comprising: a current data acquisition module, a current data analysis module, a current magnetic field conversion module, and an output module;

[0018] The current data acquisition module, the current magnetic field conversion module and the output module are arranged in a controller;

[0019] The current data acquisition module is used to obtain the current value input into the controller by the current detection module;

[0020] The current-magnetic field conversion module is used to calculate and convert the acquired current value into a magnetic force value;

[0021] The output module is used to output the obtained magnetic force value to a display screen for display.

[0022] The beneficial effects of the above technical solutions provided by the embodiments of the present invention include at least:

[0023] The present invention adopts an induction device based on electromagnetically conductive fluid, outputs corresponding currents of different intensities under different magnetic field environments, and obtains the magnitude of the magnetic force of the magnetic field by analyzing the output current rheology, thereby realizing the detection of the magnetic force of the magnetic field. The overall structure is simple and the cost is low, which solves the problem that there is no magnetic field sensor based on electromagnetically conductive fluid in the prior art.

[0024] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0025] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 This is a schematic structural diagram of a magnetic field sensor based on a conductive magnetic fluid disclosed in an embodiment of the present invention;

[0028] Figure 2 This is a schematic cross-sectional view of a magnetic field sensor based on a conductive magnetic fluid according to an embodiment of the present invention;

[0029] Figure 3 A schematic cross-sectional view of the sensing device disclosed in an embodiment of the present invention;

[0030] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0031] Figure 5 This is a communication block diagram of a magnetic field sensor based on a conductive magnetic fluid disclosed in an embodiment of the present invention;

[0032] Figure 6 This is a schematic structural diagram of a magnetic field sensor system based on electromagnetically conductive fluid disclosed in an embodiment of the present invention.

[0033] Reference numerals:

[0034] 1. Shell; 2. Sensing device; 21. Device shell; 211. Cavity; 212. Air hole; 22. Fixing device; 221. First fixing plate; 222. Second fixing plate; 223. First connecting cover; 224. Second connecting cover; 225. Connecting ring; 226. Limiting sleeve; 23. Sensing component; 231. Capsule; 232. Electromagnetic fluid; 24. Connecting device; 241. First electrode; 2411. First metal electrode; 2412. Second metal electrode; 2413. Connecting wire; 2414. Connecting sleeve; 242. Second electrode; 3. Output device; 31. Current detection module; 32. Controller; 33. Display screen; 4. Control system; 41. Current data acquisition module; 42. Current magnetic field conversion module; 43. Output module; 5. Power supply. DETAILED DESCRIPTION

[0035] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] Refer to the attached Figure 1-5 As shown, an embodiment of the present invention provides a magnetic field sensor based on a conductive magnetic fluid, which includes a housing 1, a sensing device 2 and an output device 3. The sensing device 2 includes a device housing 21, a fixing device 22, a sensing component 23 and a connecting device 24. The device housing 21 is arranged on one side of the interior of the housing 1. A cavity 211 is provided inside the device housing 21. An air hole 212 is opened on one side of the device housing 21 and communicates with the interior of the cavity 211. The fixing device 22 is arranged inside the cavity 211. The sensing component 23 is arranged inside the fixing device 22. One end of the connecting device 24 passes through the connecting device 24 housing, the fixing device 22 and the sensing component 23 in sequence. The output device 3 is electrically connected to the other end of the connecting device 24. The output device 3 is used to output a numerical value of the magnetic force. The sensing device 2 based on the conductive magnetic fluid 232 has a simple overall structure and low cost. It outputs currents of different intensities corresponding to different magnetic field environments. The magnitude of the magnetic force of the magnetic field is obtained by analyzing the output current rheology, thereby detecting the magnitude of the magnetic force of the magnetic field. This solves the problem that there is no magnetic field sensor based on the conductive magnetic fluid in the prior art.

[0037] The embodiment of the present invention is also implemented through the following technical solutions.

[0038] Refer to the attached Figure 3-5 As shown, in the embodiment of the present invention, the fixing device 22 includes a first fixing plate 221, a second fixing plate 222, a first connecting cover 223, a second connecting cover 224, a connecting ring 225 and a limiting sleeve 226. The first fixing plate 221 and the second fixing plate 222 are respectively arranged at the upper and lower parts of the cavity 211. The first connecting cover 223 is arranged at the bottom of the first fixing plate 221, the second connecting cover 224 is arranged at the top of the second fixing plate 222, the limiting sleeve 226 is arranged at the top of the second connecting cover 224, the limiting sleeve 226 is arranged at the top of the limiting sleeve 226, and the limiting sleeve 226 is arranged at the top of the limiting sleeve 226. 26 is connected to the inner wall of the cavity 211, and the sensing component 23 includes a capsule 231 and an electromagnetic fluid 232. The capsule 231 is elliptical in shape, and the electromagnetic fluid 232 is filled in the interior of the capsule 231. The top of the capsule 231 is fixedly connected to the bottom of the first connecting cover 223, and the bottom of the capsule 231 is fixedly connected to the top of the second connecting cover 224. The surface of the capsule 231 is fixedly connected to the connecting ring 225. The first connecting cover 223, the second connecting cover 224 and the connecting ring 225 are used to limit the position of the capsule 231, and the surface of the capsule 231 is in contact with the surface of the limiting sleeve 226.

[0039] It should be noted that the shape of the limiting sleeve 226 is adapted to the shape of the capsule 231, the capsule 231 fits the surface of the limiting sleeve 226, and the capsule 231 is in contact with the limiting sleeve 226. When the top direction of the shell 1 is subjected to the magnetic force of the magnetic field, the electromagnetic conductive fluid 232 inside the capsule 231 moves toward the first connecting cover 223 under the action of the magnetic force, squeezing the upper part of the capsule 231 and expanding outward. According to the magnitude of the magnetic force, the degree of deformation of the capsule 231 is different. The greater the magnetic force, the greater the degree of deformation of the capsule 231, and the smaller the magnetic force, the smaller the degree of deformation of the capsule 231. When the magnetic force of the magnetic field in the top direction of the shell 1 disappears, the capsule 231 returns to its original state, and the air hole 212 is used to maintain the pressure balance inside the cavity 211 during the deformation of the capsule 231.

[0040] As a preferred embodiment, the conductive magnetic fluid 232 is made of magnetic fluid with conductive material added thereto, and the induction component 23 is made by the following steps:

[0041] Step 1, selecting magnetic particles, a carrier liquid and a surfactant for preparing a magnetic fluid to prepare a magnetic fluid;

[0042] The magnetic particles used to prepare the magnetic fluid in step 1 include any one of ferrite, magnetic metal or magnetic rare earth material;

[0043] The carrier liquid for preparing the magnetic fluid in step 1 includes any one of water, refined synthetic oil, hydrocarbons, fluorocarbon-based compounds, esters and diesters, silicate esters, mercury, kerosene or ionic liquids;

[0044] In step 1, the surfactant for preparing the magnetic fluid includes: unsaturated fatty acids, such as oxalic acid, oleic acid, linoleic acid, linolenic acid, silane coupling agent, hydroxy polydimethylsiloxane, carboxyl polydimethylsiloxane, fluoroether acid, fluoroether sulfonic acid and corresponding derivatives, perfluoropolyisopropyl ether, phenyl undecanoic acid or o-phenoxybenzoic acid.

[0045] Step 2, adding a conductive material to the prepared magnetic fluid to obtain a conductive magnetic fluid 232;

[0046] The conductive material in step 2 includes any one of inorganic salts, organic salts, metals, metal alloys or carbon materials.

[0047] In another embodiment, the conductive electromagnetic fluid 232 obtained in step 2 can be made of a conductive material such as an ionic liquid as a conductive carrier liquid. If an ionic liquid is selected as the conductive carrier liquid, no conductive material is added.

[0048] Step 3: seal the obtained electromagnetically conductive fluid 232 in the capsule 231 .

[0049] Refer to the attached Figure 3-5 As shown, in the embodiment of the present invention, the capsule 231 is made of elastic material.

[0050] It should be noted that the material of the capsule 231 is any one of acrylate, epoxy resin, polysiloxane, polyether, polyester, polyimide, polyurethane, rubber or fiber.

[0051] Refer to the attached Figure 1-5As shown, in this embodiment of the present invention, the connecting device 24 includes a first electrode 241 and a second electrode 242. The first electrode 241 includes a first metal electrode 2411, a second metal electrode 2412, a connecting wire 2413 and a connecting sleeve 2414. The connecting sleeve 2414 passes through the shell of the connecting device 24 and the limiting sleeve 226. The first metal electrode 2411 is arranged on one side of the inner wall of the capsule 231, and the second metal electrode 2412 is arranged at the end of the connecting sleeve 2414 away from the capsule 231. The first metal electrode 2411 and the second metal electrode 2412 are electrically connected through the connecting wire 2413. The structure of the second electrode 242 is exactly the same as that of the first electrode 241. The first electrode 241 and the second electrode 242 are arranged in a mirror image. In an embodiment of the present invention, the output device 3 includes a current detection module 31, a controller 32 and a display screen 33. The display screen 33 is arranged on the surface of the shell 1, and the current detection module 31 and the controller 32 are arranged in sequence on the other side of the interior of the shell 1. The first electrode 241 and the second electrode 242 are respectively electrically connected to the input end of the current detection module 31. The first electrode 241 and the second electrode 242 are also respectively connected to the positive and negative poles of the power supply 5. The power supply 5 outputs direct current. The output end of the current detection module 31 is electrically connected to the input end of the controller 32, and the output end of the controller 32 is electrically connected to the input end of the display screen 33.

[0052] Specifically, when the top direction of the shell 1 is subjected to the magnetic force of the magnetic field, the electromagnetic fluid 232 inside the capsule 231 moves toward the first connecting cover 223 under the action of the magnetic force, squeezing the upper part of the capsule 231, and the upper part of the capsule 231 expands outward. During the movement of the electromagnetic fluid 232, the middle part of the capsule 231 contracts, and the first metal electrode 2411 between the first electrode 241 and the second electrode 242 approaches each other. According to the formula: R = ρL / S (R resistance, S cross-sectional area, L length, ρ resistivity), it can be seen that the distance between the first electrode 241 and the second electrode 242 changes. When the middle part of the capsule 231 contracts, the length L and the cross-sectional area S change. When the resistivity ρ of the conductive electromagnetic fluid 232 is constant, the resistance R changes accordingly, and the current in the loop formed by the power supply 5, the conductive electromagnetic fluid 232, the first electrode 241 and the second electrode 242 changes. The input end detected by the current detection module 31 electrically connects the first electrode 241 and the second electrode 242 to detect the current in the loop, and inputs the detected current to the controller 32. The controller 32 analyzes the input current and outputs the corresponding magnetic value to the display screen 33 for display.

[0053] Refer to the attached Figure 1-6 As shown, the present invention also proposes a magnetic field sensor system based on a conductive magnetic fluid, comprising: a current data acquisition module 41, a current data analysis module, a current magnetic field conversion module 42 and an output module 43;

[0054] The current data acquisition module 41, the current magnetic field conversion module 42 and the output module 43 are provided in the controller 32;

[0055] The current data acquisition module 41 is used to obtain the current value input to the controller 32 by the current detection module 31;

[0056] The current-magnetic field conversion module 42 is used to convert the acquired current value into a magnetic force value;

[0057] The output module 43 is used to output the obtained magnetic force value to the display screen 33 for display.

[0058] The specific working principle is that the top of the shell 1 is facing the direction of the magnetic field. Under the action of the magnetic force, the electromagnetic fluid 232 inside the capsule 231 of the sensing component 23 moves toward the first connecting cover 223 under the action of the magnetic force, squeezing the upper part of the capsule 231 to expand outside, and the middle part of the capsule 231 contracts. At this time, the current in the loop formed by the power supply 5, the electromagnetic fluid 232, the first electrode 241 and the second electrode 242 changes. The input end detected by the current detection module 31 electrically connects the first electrode 241 and the second electrode 242 to detect the current in the loop, and the detected current is input to the controller 32. The current data acquisition module 41 obtains the current value input by the current detection module 31 to the controller 32. The current magnetic field conversion module 42 calculates the obtained current value and converts it into a magnetic force value. The output module 43 outputs the obtained magnetic force value to the display screen 33 for display, which solves the problem that there is no magnetic field sensor based on electromagnetic fluid in the prior art.

[0059] It should be noted that the specific models and specifications of the current detection module 31, controller 32, display screen 33 and power supply 5 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0060] The power supply and principles of the current detection module 31 , the controller 32 , the display screen 33 and the power supply 5 are clear to those skilled in the art and will not be described in detail here.

[0061] It should be understood that the specific order or hierarchy of steps in the disclosed processes is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0062] In the foregoing detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that embodiments of the claimed subject matter require more features than are expressly recited in each claim. On the contrary, as reflected in the appended claims, the invention comprises less than all the features of any individual disclosed embodiment. The appended claims are therefore hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0063] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein may be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps described above are generally described around their functions. Whether such functions are implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system. A skilled person may implement the described functions in an adaptable manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of this disclosure.

[0064] The steps of the methods or algorithms described in conjunction with the embodiments herein may be directly embodied as hardware, software modules executed by a processor, or a combination thereof. The software module may be located in a RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, register, hard disk, removable disk, CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and storage medium may also be present in a user terminal as discrete components.

[0065] For software implementation, the techniques described in this application can be implemented using modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or external to the processor. In the latter case, it is communicatively coupled to the processor via various means, which are well known in the art.

[0066] The foregoing description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purposes of describing the above embodiments, but one of ordinary skill in the art will recognize that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to encompass all such changes, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent the term "comprising" is used in the specification or claims, the term is intended to be encompassed in a manner similar to the term "including," as explained in terms of "including," used as a transitional word in the claims. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or."

Claims

1. A magnetic field sensor based on a conductive magnetic fluid, characterized in that: include: shell; An induction device, comprising a device housing, a fixing device, an induction component, and a connecting device; The device housing is disposed on one side of the interior of the outer shell, a cavity is disposed inside the device housing, an air hole is provided on one side of the device housing and communicates with the interior of the cavity, the fixing device is disposed inside the cavity, the sensing component is disposed inside the fixing device, and one end of the connecting device is sequentially connected to the device housing, the fixing device, and the sensing component; The fixing device includes a first fixing plate, a second fixing plate, a first connecting cover, a second connecting cover, a connecting ring and a limiting sleeve, wherein the first fixing plate and the second fixing plate are respectively arranged at the upper and lower parts of the cavity, the first connecting cover is arranged at the bottom of the first fixing plate, the second connecting cover is arranged at the top of the second fixing plate, the limiting sleeve is arranged at the top of the second connecting cover, the limiting sleeve is arranged at the top of the limiting sleeve, and the limiting sleeve is connected to the inner wall of the cavity; The induction component includes a capsule and an electromagnetically conductive fluid. The capsule is elliptical in shape and filled with the electromagnetically conductive fluid. The top of the capsule is fixedly connected to the bottom of the first connection cover, the bottom of the capsule is fixedly connected to the top of the second connection cover, the surface of the capsule is fixedly connected to the connection ring, and the surface of the capsule contacts the surface of the limiting sleeve. The connecting device includes a first electrode and a second electrode, the first electrode includes a first metal electrode, a second metal electrode, a connecting wire and a connecting sleeve, the connecting sleeve is connected through the device housing and the limiting sleeve, the first metal electrode is arranged on one side of the inner wall of the capsule, and the second metal electrode is arranged on the end of the connecting sleeve away from the capsule, and the first metal electrode and the second metal electrode are electrically connected via the connecting wire; an output device, the output device being electrically connected to the other end of the connecting device, and the output device being used to output a numerical value of the magnitude of the magnetic force; The output device includes a current detection module, a controller, and a display screen, wherein the display screen is arranged on the surface of the housing, and the current detection module and the controller are sequentially arranged on the other side of the interior of the housing, the first electrode and the second electrode are respectively electrically connected to the input end of the current detection module, and the first electrode and the second electrode are also respectively connected to the positive and negative poles of a power supply, the output end of the current detection module is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the input end of the display screen; When the top direction of the shell is subjected to the magnetic force of the magnetic field, the electromagnetic fluid inside the capsule moves toward the first connecting cover under the action of the magnetic force, squeezing the upper part of the capsule, and the upper part of the capsule expands outward. During the movement of the electromagnetic fluid, the middle part of the capsule contracts, and the first metal electrodes between the first electrode and the second electrode approach each other. According to the formula: R=ρL / S, R is resistance, S is cross-sectional area, L is length, and ρ is resistivity. When the spacing between the first electrode and the second electrode changes and the middle part of the capsule contracts, the length L and the cross-sectional area S change. When the resistivity ρ of the electromagnetic fluid remains constant, the resistance R changes accordingly, and the current in the loop formed by the power supply, the electromagnetic fluid, the first electrode and the second electrode changes. The input end of the current detection module electrically connects the first electrode and the second electrode to detect the current in the loop, and inputs the detected current to the controller. The controller analyzes the input current and outputs the corresponding magnetic force value to the display screen for display.

2. A magnetic field sensor based on an electromagnetically conductive fluid as claimed in claim 1, characterized in that: The capsule is made of elastic material.

3. The magnetic field sensor based on electromagnetically conductive fluid according to claim 1, characterized in that: The second electrode has the same structure as the first electrode, and the first electrode and the second electrode are arranged in a mirror image.

4. A magnetic field sensor system based on an electromagnetically conductive fluid, using a magnetic field sensor based on an electromagnetically conductive fluid according to any one of claims 1 to 3, characterized in that: include: Current data acquisition module, current data analysis module, current magnetic field conversion module and output module; The current data acquisition module, the current magnetic field conversion module and the output module are arranged in a controller; The current data acquisition module is used to obtain the current value input into the controller by the current detection module; The current-magnetic field conversion module is used to calculate and convert the acquired current value into a magnetic force value; The output module is used to output the obtained magnetic force value to a display screen for display.

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