阅读说明：本技术 基于光纤结构的磁场检测装置及系统 (Magnetic field detection device and system based on optical fiber structure ) 是由 不公告发明人 于 2020-07-06 设计创作，主要内容包括：本发明涉及基于光纤结构的磁场检测装置及系统,主要涉及磁场测量领域。本申请提供的磁场检测装置包括：光纤、光纤环形器、激光器、光谱仪和金属玻璃,光纤环形器的第三端口与光谱仪连接,光通过第一端口将激光器输出的光,通过第二端口输出到光纤内部,并且在金属玻璃、纤芯断面和包层形成的法布里珀罗干涉腔内反射,形成干涉光通过与光纤连接的第二端口返回该光纤环形器,并且将产生的干涉光输出到光谱仪,通过对干涉光的光谱的变化进行分析,并通过光谱变化情况与法布里珀罗干涉腔形变的对应关系,得到该法布里珀罗干涉腔的形变参数,并且根据该金属玻璃的磁致伸缩系数,得到准确的磁场参数。(The invention relates to a magnetic field detection device and system based on an optical fiber structure, and mainly relates to the field of magnetic field measurement. The application provides a magnetic field detection device includes: the optical fiber, the optical fiber circulator, the laser, the spectrometer and the metal glass, a third port of the optical fiber circulator is connected with the spectrometer, light output by the laser is output to the inside of the optical fiber through the first port, and is reflected in a Fabry-Perot interference cavity formed by the metal glass, the fiber core section and the cladding, interference light is formed and returns to the optical fiber circulator through the second port connected with the optical fiber, the generated interference light is output to the spectrometer, deformation parameters of the Fabry-Perot interference cavity are obtained through analyzing the change of the spectrum of the interference light and the corresponding relation between the spectrum change condition and the Fabry-Perot interference cavity deformation, and accurate magnetic field parameters are obtained according to the magnetostriction coefficient of the metal glass.)

1. A magnetic field detection device based on an optical fiber structure, the magnetic field detection device comprising: the optical fiber comprises a fiber core and a cladding, one end of the optical fiber is provided with one section of the fiber core, the metal glass is filled at the end where the fiber core is removed, the metal glass, the fiber core section and the cladding form a sealed cavity, the other end of the optical fiber is provided with the optical fiber circulator, the laser and the spectrometer are arranged on one side, away from the metal glass, of the optical fiber circulator, a first port of the optical fiber circulator is connected with the laser, a second port of the optical fiber circulator is connected with the optical fiber, and a third port of the optical fiber circulator is connected with the spectrometer.

2. The optical fiber structure-based magnetic field detection device according to claim 1, wherein the metallic glass, the fiber core section and the cladding layer form a cavity wall of the sealed cavity, and a high-reflection film is plated on the metallic glass, the fiber core section and the cladding layer.

3. The optical fiber structure-based magnetic field detection device according to claim 2, wherein the high reflection film has a reflectivity of 80% to 90%.

4. The optical fiber structure-based magnetic field detection device according to claim 2, wherein the material of the high reflection film is a noble metal material.

5. The optical fiber structure-based magnetic field detection device according to claim 4, wherein the material of the high reflection film is one or more of gold, silver, ruthenium, rhodium, palladium, osmium, iridium, and platinum.

6. The optical fiber structure-based magnetic field detection device according to claim 2, wherein a side of the metal glass chamber wall in the sealed chamber is plated with a total reflection film.

7. The optical fiber structure-based magnetic field detection device according to claim 6, wherein the material of the total reflection film is silver.

8. The optical fiber structure-based magnetic field detection device according to claim 2, further comprising an optical gain medium filled in the sealed cavity.

9. A magnetic field detection system based on an optical fiber structure, the magnetic field detection system comprising: a magnetic field generating device and the magnetic field detecting device of any one of claims 1 to 8, the magnetic field generating device being disposed outside the magnetic field detecting device.

Technical Field

The invention relates to the field of magnetic field measurement, in particular to a magnetic field detection device and system based on an optical fiber structure.

Background

Magnetic fields are fields that transmit the action of magnetic forces between objects. The magnetic field is a special substance which is invisible and untouchable. The magnetic field is not composed of atoms or molecules, but the magnetic field is objectively present. 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. Since the magnetism of a magnet is derived from an electric current, which is the movement of an electric charge, in general terms, a magnetic field is generated by the change in the moving charge or electric field.

Disclosure of Invention

The present invention is directed to provide a magnetic field detection apparatus and system based on an optical fiber structure, which solve the problems of the prior art that when measuring a magnetic field, it is generally necessary to bring a device for measuring a magnetic field as close as possible to the magnetic field, thereby reducing errors caused by the magnetic field, but the prior art uses a coil to measure the magnetic field, and it is difficult to get deep into the magnetic field in a narrow area, thereby affecting the measurement accuracy.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:

in a first aspect, the present application provides a magnetic field detection device based on an optical fiber structure, the magnetic field detection device including: optical fiber, optical fiber circulator, the laser instrument, spectrum appearance and metallic glass, optical fiber includes fibre core and cladding, one section fibre core is removed to the one end of optical fiber, metallic glass fills the one end of removing the fibre core, metallic glass, fibre core section and cladding form the seal chamber, the other end of optical fiber is provided with the optical fiber circulator, laser instrument and spectrum appearance all set up the one side of keeping away from metallic glass at the optical fiber circulator, and the first port and the laser instrument of optical fiber circulator are connected, the second port and the optical fiber connection of optical fiber circulator, the third port and the spectrum appearance of optical fiber circulator are connected.

Optionally, the metallic glass, the core section and the cladding form a wall of the sealed cavity, and a high-reflection film is plated on the wall.

Optionally, the highly reflective film has a reflectivity of 80% to 90%.

Optionally, the material of the high reflection film is a noble metal material.

Optionally, the material of the high reflection film is one or more of gold, silver, ruthenium, rhodium, palladium, osmium, iridium, and platinum.

Optionally, one side of the sealed cavity, which is the cavity wall made of the metallic glass, is plated with a total reflection film.

Optionally, the material of the total reflection film is silver.

Optionally, the magnetic field detection device further includes an optical gain medium, and the optical gain medium is filled in the sealed cavity.

In a second aspect, the present application provides a magnetic field detection system based on an optical fiber structure, the magnetic field detection system comprising: a magnetic field generating device provided outside the magnetic field detecting device, and the magnetic field detecting device of any one of the first to third aspects.

The invention has the beneficial effects that:

the application provides a magnetic field detection device includes: the optical fiber comprises a fiber core and a cladding, one end of the optical fiber is provided with a section of the fiber core, the metal glass is filled at the end with the fiber core removed, the metal glass, the fiber core section and the cladding form a sealed cavity, the other end of the optical fiber is provided with the fiber circulator, the laser and the spectrometer are both arranged on one side of the fiber circulator far away from the metal glass, the first port of the fiber circulator is connected with the laser, the second port of the fiber circulator is connected with the optical fiber, the third port of the fiber circulator is connected with the spectrometer, the sealed cavity formed by the metal glass, the fiber core section and the cladding at one end of the optical fiber is a Fabry-Perot interference cavity, and the mangneto metal glass is flexible, namely deformed under the action of a magnetic field, so that the interference spectrum of interference light of the Fabry-Perot interference cavity is changed, the optical fiber circulator arranged at the other end of the optical fiber is a multi-port nonreciprocal optical device, light output by the laser is output to the inside of the optical fiber through the first port through the second port and is reflected in a Fabry-Perot interference cavity formed by the metal glass, the fiber core section and the cladding to form interference light, the interference light returns to the optical fiber circulator through the second port connected with the optical fiber and is output to the spectrometer, the generated interference light is output to the spectrometer, the accurate magnetic field parameter is obtained by analyzing the change of the spectrum of the interference light and according to the corresponding relation between the spectrum change condition and the deformation of the Fabry-Perot interference cavity, the change of the magnetic field is converted into the change of the Fabry-Perot interference spectrum, the high sensitivity is achieved, and the optical fiber is used for detecting the magnetic field, the volume is small, and the magnetic field in a narrow area can be detected.

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 another magnetic field detection device based on an optical fiber structure according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another magnetic field detection device based on an optical fiber structure according to an embodiment of the present invention.

Icon: 10-an optical fiber; 11-a core; 12-a cladding layer; 20-a fiber optic circulator; 30-a laser; 40-a spectrometer; 50-metallic glass; 60-optical gain medium.

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 one embodiment of the present invention, and not all embodiments. 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.

In order to make the implementation of the present invention clearer, the following detailed description is made with reference to the accompanying drawings.

The application provides a magnetic field detection device based on optical fiber structure, magnetic field detection device includes: the optical fiber 10 comprises a fiber core 11 and a cladding 12, one section of the fiber core 11 is removed from one end of the optical fiber 10, the metal glass 50 is filled in the end from which the fiber core 11 is removed, the metal glass 50, the section of the fiber core 11 and the cladding 12 form a sealed cavity, the fiber ring 20 is arranged at the other end of the optical fiber 10, the laser 30 and the spectrometer 40 are both arranged on one side of the fiber ring 20, which is far away from the metal glass 50, a first port of the fiber ring 20 is connected with the laser 30, a second port of the fiber ring 20 is connected with the optical fiber 10, and a third port of the fiber ring 20 is connected with the spectrometer 40.

A fiber core 11 is partially removed from one end of the optical fiber 10, so that the optical fiber 10 only has a cladding 12, the section where the fiber core 11 is removed is polished to make the section smooth, a metal glass 50 is used to fill in an opening of the cladding 12 and is arranged opposite to the section, so that the section, the cladding 12 and the metal glass 50 form a sealed cavity, and because one side adjacent to the sealed cavity is the optical fiber 10, the sealed cavity is a fabry-perot interference cavity, when light enters from the optical fiber 10, the light can be reflected for multiple times in the fabry-perot interference cavity and generate interference light, and because of the magnetostrictive property, the metal glass 50 can be deformed in a magnetic field, so that the interference spectrum of the interference light of the fabry-perot interference cavity is changed; the other end of the optical fiber 10 is provided with a fiber circulator 20, a laser 30 and a charge coupler, the laser 30 and the charge coupler are both arranged on the side of the fiber circulator 20 away from the metallic glass 50, generally, the laser 30 and the charge coupler are arranged in a stack, the laser 30 is stacked above the charge coupler, and since the fiber circulator 20 is a multi-port non-reciprocal optical device, the light output from the laser 30 through a first port is output to the inside of the optical fiber 10 through a second port and is reflected in a fabry-perot interference cavity formed by the metallic glass 50, the section of the fiber core 11 and the cladding 12, the interference light is formed to return to the fiber circulator 20 through the second port connected with the optical fiber 10, and the reflected light is output to the spectrometer 40, by analyzing the spectral change of the interference light and by the corresponding relation of the spectral change condition and the fabry-perot interference cavity deformation, the method includes the steps that deformation parameters of the Fabry-Perot interference cavity are obtained, accurate magnetic field parameters are obtained according to the magnetostriction coefficient of the metal glass 50, the change of a magnetic field is converted into the change of a Fabry-Perot interference spectrum, the Fabry-Perot interference spectrum has high sensitivity, the size of the metal glass is small due to the fact that the optical fiber 10 is used for detecting the magnetic field, the magnetic field in a narrow area can be detected, it needs to be stated that the corresponding relation between the spectrum change situation and the Fabry-Perot interference cavity deformation is obtained according to experiments, specific description is not made here, the magnetostriction coefficient of the metal glass 50 is related according to the components of the metal glass, specific geometrical parameters of the Fabry-Perot interference cavity are set according to actual needs, and specific limitation is not made here.

The term metallic glass, also known as amorphous alloy, has both the advantages of metal and glass and overcomes their respective disadvantages, such as the brittleness and lack of ductility of glass. Metallic glass is stronger than steel, harder than high-hardness tool steel, and has a certain toughness and rigidity, which is that molten liquid metal at high temperature is cooled at a very fast speed, so that metal atoms are not crystallized in time according to the conventional arrangement, and are "frozen" in an irregular and disordered state, thereby having the unique characteristics similar to glass.

The circulator is a multi-port device which transmits incident waves entering any port of the circulator into the next port according to the direction sequence determined by the static bias magnetic field. A circulator is a non-reciprocal device with several ends. The optical fiber circulator 20 is characterized in that high-frequency signal energy can be transmitted in a single direction, and the optical fiber circulator is manufactured by utilizing a micro-optics principle. The double refraction crystal and the 45-degree Faraday rotator are arranged in the middle of the capillary, a polarization maintaining collimator is arranged at one end of the capillary, one end of the polarization maintaining collimator is in adhesive connection with the 45-degree Faraday rotator, a polarization maintaining optical fiber 10 is adhered to the other end of the polarization maintaining collimator, a first collimator and a second collimator which are arranged in parallel are arranged at the other end of the capillary, one ends of the first collimator and the second collimator are in adhesive connection with one end of the double refraction crystal, a first optical fiber 10 is adhered to the other end of the first collimator, and a second optical fiber 10 is adhered to the other end of the second collimator.

Optionally, the metallic glass 50, the cross section of the core 11 and the cladding 12 are coated with a high reflective film on the wall of the sealed cavity.

In order to further increase the accuracy of the magnetic field detection device in detecting the magnetic field and reduce the loss of the transmitted light, the inner cavity wall of the fabry-perot interference cavity formed by the metallic glass 50, the section of the fiber core 11 and the cladding 12 is coated with a high reflective film, when the light is emitted from the optical fiber 10 in the fabry-perot interference cavity, the change of the interference spectrum of the interference light is only related to the volume deformation of the fabry-perot interference cavity and unrelated to the loss of other light, so that the magnetic field detection device can detect the magnetic field more accurately.

Optionally, the highly reflective film has a reflectivity of 80% to 90%.

Optionally, the material of the high reflection film is a noble metal material.

Optionally, the material of the high reflection film is one or more of gold, silver, ruthenium, rhodium, palladium, osmium, iridium, and platinum.

The inner wall of the fabry-perot interference cavity is coated with a simple substance noble metal of gold, silver, ruthenium, rhodium, palladium, osmium, iridium and platinum or an alloy of gold, silver, ruthenium, rhodium, palladium, osmium, iridium and platinum, if the inner wall of the fabry-perot interference cavity is coated with an alloy of gold, silver, ruthenium, rhodium, palladium, osmium, iridium and platinum, the type and proportion of the noble metal in the alloy are selected according to actual needs, and are not particularly limited, generally, the noble metal coated on the inner wall of the fabry-perot interference cavity is a high-reflection film formed by silver, the high-reflection film formed by the silver can achieve the reflectivity of light of 80-90%, further the loss of light is reduced, so that the change of an interference spectrum of the interference light generated when the light passes through the optical fiber 10 and the fabry-perot interference cavity is only related to the volume deformation of the fabry-perot interference cavity, the influence of light loss on magnetic field detection is reduced, so that the magnetic field detection device can detect the magnetic field more accurately.

Optionally, the side of the sealed cavity, which is the cavity wall, of the metallic glass 50 is plated with a total reflection film.

Optionally, the material of the total reflection film is silver.

The high reflection surface of the metal glass 50 near the optical fiber 10 can be a total reflection film to further reduce the light loss, so that when light passes through the optical fiber 10 and the fabry-perot interference cavity, the change of the interference spectrum of the interference light is only related to the volume deformation of the fabry-perot interference cavity, the influence of light loss on the magnetic field detection is reduced, the magnetic field detection device can accurately detect the magnetic field, and the total reflection film is made of silver.

Optionally, the magnetic field detection device further comprises an optical gain medium 60, and the optical gain medium 60 is filled in the sealed cavity.

The metal glass 50, the section of the fiber core 11 and the cladding 12 form a sealed cavity filled with the optical gain medium 60, the optical gain medium 60 can amplify light, parameters such as sharpness and color resolution of the generated interference spectrum are improved, and the resolution of the interference spectrum is improved. Thereby improving the detection sensitivity, and the material of the optical gain medium 60 is selected according to actual needs, and is not specifically limited herein.

The application provides a magnetic field detection device includes: the optical fiber 10 comprises a fiber core 11 and a cladding 12, one end of the optical fiber 10 is provided with a segment of the fiber core 11, the metal glass 50 is filled at the end with the segment of the fiber core 11 removed, the metal glass 50, the section of the fiber core 11 and the cladding 12 form a sealed cavity, the other end of the optical fiber 10 is provided with the fiber circulator 20, the laser 30 and the spectrometer 40 are both arranged at one side of the fiber circulator 20 away from the metal glass 50, a first port of the fiber circulator 20 is connected with the laser 30, a second port of the fiber circulator 20 is connected with the optical fiber 10, a third port of the fiber circulator 20 is connected with the spectrometer 40, the sealed cavity formed by the metal glass 50, the section of the fiber core 11 and the cladding 12 at one end of the optical fiber 10 is a Fabry-Perot interference cavity, and the metal glass 50 deforms under the action of a magnetic field, further, the interference spectrum of the interference light of the fabry-perot interference cavity is changed, the fiber circulator 20 disposed at the other end of the fiber 10 is a multi-port non-reciprocal optical device, the light output from the laser 30 is output to the inside of the fiber 10 through the second port via the first port and is reflected in the fabry-perot interference cavity formed by the metal glass 50, the section of the fiber core 11 and the cladding 12 to form interference light, the interference light returns to the fiber circulator 20 through the second port connected to the fiber 10 and the generated interference light is output to the spectrometer 40, the deformation parameter of the fabry-perot interference cavity is obtained by analyzing the spectral change of the interference light and by the corresponding relationship between the spectral change condition and the deformation of the fabry-perot interference cavity, and the accurate magnetic field parameter is obtained according to the magnetostrictive coefficient of the metal glass 50, the change of the magnetic field is converted into the change of the fabry-perot interference spectrum, the optical fiber 10 has high sensitivity, is small in size when used for detecting a magnetic field, and can detect the magnetic field in a narrow area.

The application provides a magnetic field detecting system based on optical fiber structure, magnetic field detecting system includes: and a magnetic field generating device provided outside the magnetic field detecting device, and the magnetic field detecting device of any one of the above.

The magnetic field generating device is used for adjusting and detecting the magnetic field detecting device, when no external magnetic field exists, the magnetic field generating device is used for releasing a set magnetic field, the magnetic field detecting device is used for detecting, if the result of the detected magnetic field is matched with the set magnetic field, the detection result of the magnetic field detecting device is accurate, otherwise, the magnetic field detecting device is adjusted.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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.