CN114720916A - Optical fiber magnetic field sensor, vector optical fiber magnetic field sensor and distributed measurement system - Google Patents
Optical fiber magnetic field sensor, vector optical fiber magnetic field sensor and distributed measurement system Download PDFInfo
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Abstract
The invention discloses an optical fiber magnetic field sensor, a vector optical fiber magnetic field sensor and a distributed measurement system, and belongs to the technical field of optical fiber sensors. Wherein, optic fibre magnetic field sensor includes: the device comprises a single mode fiber, a polytetrafluoroethylene packaging shell, a Polydimethylsiloxane (PDMS) sheet, epoxy resin, a magnetostrictive material, a magnetic field response FBG and a temperature compensation FBG. The invention effectively eliminates the measurement error of the sensor caused by the influence of the environmental temperature change and improves the precision of the optical fiber magnetic field sensor; meanwhile, by designing a cylindrical packaging shell, the problem of poor stability of the optical fiber magnetic field sensor in a severe environment is solved, and the service life of the optical fiber magnetic field sensor is greatly prolonged; the vector optical fiber magnetic field sensor provided by the invention has the advantages of small structure and high sensitivity, and can be used for simultaneously detecting the magnitude and direction of the magnetic field intensity and realizing large-scale multi-point detection.
Description
Technical Field
The invention relates to the technical field of optical fiber magnetic field sensors, in particular to an optical fiber magnetic field sensor, a vector optical fiber magnetic field sensor and a distributed measurement system.
Background
The magnetic field sensor becomes an effective means for researching material characteristics and exploring unknown space, and has wide application prospect in the technical fields of military and national defense, earthquake disaster prediction, aerospace, medical diagnosis and treatment, manufacturing industry and the like. With the rapid development of modern technology, people put forward higher requirements on the sensitivity and size structure of the magnetic field sensor, and the magnetic field sensor with high resolution, high sensitivity, compact structure and small size becomes a research hotspot.
According to different measurement principles, magnetic field sensors can be divided into optical type and electrical type, wherein most of electrical magnetic field sensors have the defects of weak anti-electromagnetic interference capability, sensitive crossing of multiple parameters, short detection distance, small detection area, large volume, high cost and the like. The optical fiber sensing technology is used as a novel monitoring technology which is rapidly developed in recent years, compared with a traditional electrical magnetic field sensor, the optical fiber has higher electrical insulation, and has the advantages of small and exquisite structure, low price, electromagnetic interference resistance, corrosion resistance and convenience for remote measurement. In recent years, the trend of using optical fibers as sensing elements to detect various physical parameters has received much attention and interest. Therefore, the research of the optical fiber magnetic field sensor has important significance.
The optical fiber magnetic field sensor is divided into a magnetofluid refractive index regulation type, a Faraday optical rotation effect type, an ampere force mixed photoelectric type and a magnetostriction effect integrated type according to a sensing mechanism, wherein the magnetofluid refractive index regulation type and the Faraday optical rotation effect type based optical fiber magnetic field sensor have the problems of complex optical path, high material manufacturing difficulty, low robustness, cross of multi-parameter sensitivity and the like, for example, the problem of complex sensor manufacturing process exists in a tunable single-core photonic crystal fiber SPR single polarization wavelength splitter (patent No. CN 201710123495.0); the problem of cross-parameter sensitivity exists in a novel Faraday optical rotator (patent No. CN 201922032735.3); the ampere force-based hybrid photoelectric optical fiber magnetic field sensor has the defects of high manufacturing cost and complex insulating structure. Compared with the prior art, the integrated optical fiber magnetic field sensor based on the magnetostrictive effect has the advantages of simple requirements on optical paths, high response speed, low manufacturing cost, easiness in integration and packaging, easiness in installation and transportation and the like, and is more suitable for detecting relevant parameter information of a magnetic field in complex environments such as weak magnetism, magnetic leakage and the like.
Compared with the traditional electric magnetic field sensor, the distributed optical fiber sensing technology has the advantages of small volume, light weight, electromagnetic and radiation interference resistance, corrosion resistance, low loss, large broadband, suitability for long-distance transmission, wide application range and the like. The distributed optical fiber sensor is hardly affected by external electromagnetic interference and severe weather, and meanwhile, the distributed optical fiber sensor is flexible in layout and can realize very wide geographical coverage. The method is applied to various industries and fields such as aerospace and navigation, oil exploration and pipeline transmission, bridge and dam, building detection, scientific research and the like, and remarkable achievement and progress are achieved. At present, the distributed optical fiber sensing technology has become a focus of attention and research at home and abroad. The research on the distributed optical fiber sensing technology is carried out in countries such as the united states, australia, japan, europe and the like, and remarkable progress is made, so that the distributed optical fiber sensor is widely applied to the military and civil fields. Although the domestic optical fiber detection technology and the distributed optical fiber detection technology start relatively late, good results are obtained in both research subjects and research fields. In summary, compared with the traditional sensor, the distributed optical fiber sensor has incomparable advantages in scientific research and engineering application, and has gained great attention and development in the sensing and monitoring field.
It should be noted that the distributed optical fiber sensing technology introduced in the background art is widely applied in numerous industries such as aviation, navigation, oil and gas pipeline transmission, perimeter security, bridge dams, scientific research, and the like. However, in practical applications, distributed optical fiber magnetic field sensors based on the magnetostrictive effect are generally affected by temperature and stress changes, so that the detection accuracy of the sensors is reduced. Under different application environments, how to effectively eliminate crosstalk caused by temperature to a sensor is also a problem to be solved urgently. In addition, the magnetic field is a vector and has both a direction and a magnitude, and most of research on the conventional fiber magnetic field sensor based on the magnetostrictive effect focuses on the measurement of the magnetic field strength, but neglects the measurement of the magnetic field direction, for example, a fiber magnetic field sensor based on the magnetostrictive effect is disclosed (patent No. CN 201821014384.2).
Therefore, the distributed vector optical fiber magnetic field sensor based on the magnetostrictive effect, which is high in sensitivity, high in integration degree, strong in environmental adaptability and multi-parameter sensing, has great application significance for monitoring the magnetic distribution characteristics of large equipment, early warning of ports, geological exploration, early warning of disasters and the like.
Disclosure of Invention
The invention aims to provide an optical fiber magnetic field sensor, a vector optical fiber magnetic field sensor and a distributed measurement system, which are used for solving the technical problems in the prior art. The invention designs the cylindrical packaging shell, thereby effectively protecting the optical fiber from being interfered by the external environment. The invention realizes large-scale multipoint detection, positioning measurement and high reusability by designing the distributed vector optical fiber magnetic field sensor, thereby being suitable for complex and changeable magnetic field environments. The method can be applied to magnetic distribution characteristic monitoring, port early warning, geological exploration, disaster early warning and the like of large equipment, and has important application significance and engineering practical value.
In order to achieve the purpose, the invention provides the following scheme to achieve the purpose:
according to a first aspect of the present invention, there is provided a distributed optical fiber magnetic field sensor based on a magnetostrictive effect, comprising: the device comprises a single-mode fiber, a first shell, a second shell, a first groove, a second groove, an epoxy resin block, a Terfenol-D block, a magnetic field response FBG, a temperature compensation FBG and a buffer sheet; the first shell is provided with a plurality of first threaded holes, the second shell is provided with the first groove and the second groove along the axial direction of the second shell, and the second shell is provided with second threaded holes corresponding to the first threaded holes; the magnetic field response FBG and the temperature compensation FBG are distributed on the single-mode fiber along the axial direction of the single-mode fiber, and the single-mode fiber penetrates through the first groove and the second groove to be placed; the Terfenol-D block is placed on the magnetic field response FBG and embedded in the first groove, the epoxy resin is placed on the temperature compensation FBG and embedded in the second groove, and the buffer sheet is arranged on the upper layers of the epoxy resin and the Terfenol-D block; the first housing covers the second housing.
Preferably, the magnetic field response FBG and the temperature compensation FBG are both micro-nano fiber gratings which are etched and written.
Preferably, the expansion and contraction direction of the Terfenol-D block is perpendicular to the axial direction of the single-mode optical fiber.
Preferably, the buffer sheet is a Polydimethylsiloxane (PDMS) sheet to protect the epoxy resin and the Terfenol-D block from being damaged by compression.
Preferably, the first casing and the second casing are both polytetrafluoroethylene packaging casings.
According to a second technical scheme of the invention, a distributed vector optical fiber magnetic field sensor based on a magnetostrictive effect is provided, which comprises three distributed optical fiber magnetic field sensors based on the magnetostrictive effect, a fixed base and a cylindrical shell; the three optical fiber magnetic field sensors are all arranged on the fixed base, are distributed in an XYZ three-axis mode, and are arranged on the inner side wall of the cylindrical shell.
According to a third technical scheme of the present invention, a distributed measurement system is provided, which includes a light source and an optical fiber demodulator, wherein a plurality of ports of the light source are connected with single mode fibers, a plurality of distributed optical fiber vector magnetic field sensors based on the magnetostrictive effect are cascaded through the single mode fibers to form a distributed vector optical fiber magnetic field sensor array, and then the single mode fibers are connected to a plurality of ports of the optical fiber demodulator to form the vector optical fiber magnetic field sensor distributed measurement system.
Compared with the prior art, the invention has the following technical effects:
(1) according to the invention, the temperature compensation FBG is added, so that the crosstalk caused by the change of the environmental temperature to the sensor is eliminated, the problem of temperature compensation is effectively solved, and the detection precision of the optical fiber magnetic field sensor is improved on the whole.
(2) The invention provides a cylindrical packaged distributed vector optical fiber magnetic field sensor, and a distributed measurement system is formed in a cascading mode, so that the magnetic field direction and the magnetic field intensity are measured in different environments, the space range of magnetic field measurement is expanded, and the reusability of the optical fiber magnetic field sensor is improved.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic diagram illustrating an assembly structure of a distributed fiber optic magnetic field sensor based on the magnetostrictive effect according to an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating an internal structure of a distributed vector optical fiber magnetic field sensor based on a magnetostrictive effect according to an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating an assembly structure of a distributed vector optical fiber magnetic field sensor based on the magnetostrictive effect according to an embodiment of the invention;
fig. 4 shows a schematic structural diagram of a distributed measurement system according to an embodiment of the present invention.
In the figure, 1 is a single mode fiber, 2.1 is a first housing, 2.2 is a first housing, 3.1 is a first groove, 3.2 is a second groove, 4 is an epoxy block, 5 is a Terfenol-D block, 6 is a magnetic field response FBG, 7 is a temperature compensation FBG, 8 is a Polydimethylsiloxane (PDMS) sheet, 9 is a fixing screw, 10 is a cylindrical housing, 11 is a fixing base, 12 is an optical fiber magnetic field sensor, 13 is a light source, 14 vector optical fiber magnetic field sensor, 15 is an optical fiber demodulator, and 16 is a computer.
Detailed Description
The technical solution of the embodiment of the present invention is clearly and completely described below with reference to the drawings of the embodiment of the present invention. It is to be understood that the described embodiments are merely a subset of the present invention and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are intended to be protected by the present invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For a more complete understanding of the above objects, features and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram illustrating an assembly structure of a distributed fiber-optic magnetic field sensor based on the magnetostrictive effect according to an embodiment of the invention. The embodiment of the invention provides a distributed optical fiber magnetic field sensor based on a magnetostrictive effect, and as shown in fig. 1, the optical fiber magnetic field sensor mainly comprises a single-mode optical fiber 1, a first shell 2.1, a second shell 2.2, a first groove 3.1, a second groove 3.2, an epoxy resin block 4, a Terfenol-D block 5, a magnetic field FBG response FBG6, a temperature compensation 7, a Polydimethylsiloxane (PDMS) sheet 8 and a fixing screw 9. The single mode fiber 1 is placed through a through hole in the first housing 2.1, and the single mode fiber 1 is provided with a magnetic field response FBG6 and a temperature compensation FBG7 distributed along the axial direction of the single mode fiber. The Terfenol-D block 5 is placed in the first groove 3.1, the Terfenol-D block 5 and the magnetic field response FBG6 are longitudinally bonded on a magnetostrictive shaft by using cyanoacrylate glue, and polishing treatment is carried out on the bonding side of the Terfenol-D block 5 and the magnetic field response FBG6, so that the adhesive force is increased, and the bonding stability is ensured. The epoxy block 4 is placed in the first groove 3.2 and the epoxy block 4 is adhesively secured to the temperature compensated FBG7 using cyanoacrylate glue. A piece of Polydimethylsiloxane (PDMS) 8 was placed on top of the magnetic field responsive FBG6 and the temperature compensated FBG7, respectively, to protect the epoxy block 4 and Terfenol-D block 5 from crushing damage. The first casing 2.1 and the second casing 2.2 are screwed by the fixing screws 9, and prestress of different sizes can be applied to the Terfenol-D block 5 by controlling the tightness degree of the fixing screws 9.
It should be noted that "FBG" as used herein refers to fiber bragg gratings, i.e., spatial phase periodically distributed gratings formed in the core, which essentially function to form a narrow band (transmissive or reflective) filter or mirror in the core, and this characteristic can be used to fabricate many unique fiber devices. Therefore, the magnetic field response FBG refers to a fiber bragg grating having a magnetic field response performance, and the temperature compensation FBG refers to a fiber bragg grating having a temperature compensation performance. The term "Terfenol-D" as used herein refers to Terfenol-D alloy, and refers to a novel rare earth giant magnetostrictive material that exhibits a large amount of magnetostrictive strain at room temperature when a Terfenol-D alloy element is placed in a magnetic field, which is not comparable to any previous electrostrictive material, and which exhibits a large dimensional change compared to all other strained materials, which allows some precise mechanical movement. Thus, the Terfenol-D block specifically represents the element produced using the Terfenol-D alloy.
Fig. 2 is a schematic diagram illustrating an internal structure of a distributed vector optical fiber magnetic field sensor based on a magnetostrictive effect according to an embodiment of the invention. The embodiment of the invention provides a distributed vector optical fiber magnetic field sensor based on a magnetostrictive effect, and as shown in fig. 2, the vector optical fiber magnetic field sensor mainly comprises a single-mode optical fiber 1, a fixed base 11, an optical fiber magnetic field sensor 12 arranged on an X axis, an optical fiber magnetic field sensor 12 arranged on a Y axis, and an optical fiber magnetic field sensor 12 arranged on a Z axis; the optical fiber magnetic field sensor 12 arranged on the X axis, the optical fiber magnetic field sensor 12 arranged on the Y axis and the optical fiber magnetic field sensor 12 arranged on the Z axis are serially arranged on the fixed base 11 through the single mode optical fiber 1. It should be noted that each of the fiber-optic magnetic field sensors 12 is a distributed fiber-optic magnetic field sensor based on the magnetostrictive effect as shown in fig. 1, and the specific structure and the technical effects thereof have been described before and are not described herein again.
Fig. 3 is a schematic diagram illustrating an assembly structure of a distributed vector optical fiber magnetic field sensor based on the magnetostrictive effect according to an embodiment of the present invention. As shown in fig. 3, the vector optical fiber magnetic field sensor mainly comprises a cylindrical housing 10, a fixed base 11, and an optical fiber magnetic field sensor 12; the optical fiber magnetic field sensor 12 is arranged on the fixed base 11, the optical fiber magnetic field sensor 12 is distributed in XYZ three-axis mode, the fixed base 11 is arranged on the inner side wall of the cylindrical shell 10, the cylindrical shell 10 is hollow, and the fixed base is packaged and fixed with the shells on two sides through the fixing screws 9. The specific structure of the fiber-optic magnetic field sensor 12 in XYZ triaxial distribution is shown in fig. 2.
Fig. 4 shows a schematic structural diagram of a distributed measurement system according to an embodiment of the present invention. The embodiment of the invention provides a distributed measurement system. As shown in fig. 4, the distributed measurement system mainly includes a single-mode optical fiber 1, a light source 13, a vector optical fiber magnetic field sensor 14, an optical fiber demodulator 15, and a computer 16; a plurality of ports of the light source 13 are connected with a plurality of single mode fibers 1, a plurality of vector optical fiber magnetic field sensors 14 are cascaded through the single mode fibers 1 to form a distributed vector optical fiber magnetic field sensor array, then the single mode fibers are connected with a plurality of ports of an optical fiber demodulator 15, and the optical fiber demodulator 15 is connected with a computer 16 through a data line to form a vector optical fiber magnetic field sensor distributed measuring system.
With full knowledge of the distributed optical fiber magnetic field sensor structure based on the magnetostrictive effect provided by the embodiment of the present invention, the following detailed description of the embodiment of the present invention will be given in conjunction with the specific structure of the distributed optical fiber magnetic field sensor to eliminate the influence of temperature on strain measurement.
Specifically, when an external magnetic field acts on the distributed vector optical fiber magnetic field sensor, the Terfnol-D block 5 is strained due to the magnetostrictive effect and transfers the strain to the magnetic field response FBG6, so that the central reflection wavelength of the reflection spectrum resonance peak of the magnetic field response FBG6 is changed, the variation of the central reflection wavelength is detected by the optical fiber demodulator, and the variation of the magnetic field can be obtained by calculation.
The formula of the magnetostrictive effect is shown in formula (1):
wherein epsilonTIs the amount of strain of the Terfenol-D mass,. DELTA.L is the amount of elongation of the Terfenol-D mass, and L is the TerfLength of enol-D block, CfThe magnetostriction coefficient of the Terfenol-D block is the magnetostriction coefficient, when the bias magnetic field is increased, the magnetostriction coefficient is increased along with the increase of the bias magnetic field, and H is the magnitude of the external magnetic field.
When a wide-spectrum light is incident on an FBG (Fiber Bragg Grating), light satisfying the FBG Bragg reflection condition is effectively reflected back, and light of other wavelengths is transmitted out. According to the coupled mode theory, FBG center reflection wavelength lambdaBThe calculation formula is shown in formula (2):
λB＝2neffΛ (2)
wherein n iseffLambda is the period of the grating, which is the effective index of the guided mode.
When the FBG grid region with magnetic field response is subjected to the stress change of the Terfenol-D block, the grating period lambada and the effective refractive index n are caused by the elastic strain of the material and the elasto-optic effect and the waveguide effect of the optical fibereffThe formula of the change, which causes the FBG central reflection wavelength to change, is shown in formula (3):
ΔλBg＝Δε×λB×(1-Pe)＝KεΔε (3)
wherein Δ λBgThe change of the central wavelength of the FBG caused by the stress change of the Terfenol-D block, PeIs the effective elasto-optic coefficient, K, of the optical fiberεIs the strain sensitivity of the fiber.
When the external temperature change acts on the magnetic field response FBG and the temperature compensation FBG, the central reflection wavelength of the FBG can be shifted due to the thermal expansion effect and the thermo-optic effect of the optical fiber, and the FBG central wavelength drift formula is shown as the formula (4):
ΔλBt＝ΔT×λB×(α+ζ)＝KTΔT (4)
wherein Δ λBtThe change of the FBG center wavelength caused by the external temperature change, zeta is the thermo-optic coefficient of the optical fiber, KTIs the strain sensitivity of the fiber.
By comprehensively considering various effects, the total wavelength relative offset of the Terfenol-D block stress change and the external temperature change on the FBG central wavelength can be obtained as follows:
in the invention, the temperature compensation FBG is bonded with the epoxy resin block and is not influenced by stress change, so that the central reflection wavelength of the temperature compensation FBG is only influenced by external temperature change, and the formula (5) can be simplified as follows:
wherein, the relative wavelength deviation Delta lambda of the FBG with magnetic field response can be directly measured by a fiber grating demodulatorB1And the wavelength relative shift DeltaLambda of the temperature compensated FBGB2；λBStrain sensitivity K of definite value optical fiber being optical fiber gratingε1，KT1，KT2Can be measured by experiments. Therefore, through the calculation of the two formulas (6) and (7), the stress variation delta epsilon and the temperature variation delta T can be solved, so that the problem of temperature compensation is effectively solved, and the influence of temperature on strain measurement is eliminated.
In the following, the embodiment of the present invention will explain how the distributed measurement system determines the direction of the magnetic field in detail by combining with the specific structure of the distributed vector optical fiber magnetic field sensor.
Specifically, in the rectangular coordinate system, the magnetic field H is decomposed into 3 magnetic fields in orthogonal directions, and the included angles between the magnetic field and the Z, X, Y direction are λ corresponding to the X, Y, Z axes of the rectangular coordinate system, respectivelyZ、λX、λYX, Y, Z magnetic field intensity components H in three directions of axisX、HY、HZRespectively shown in formula (8):
angle lambda between magnetic field and Z, X, Y directionZ，λX，λYThe sum of the squared cosines of (a) represents the modulus of the unit vector in the direction of the magnetic field, and must satisfy equation (9):
cos(λZ)2+cos(λX)2+cos(λY)2＝1 (9)
in the invention, data obtained by the optical fiber demodulator is transmitted to the computer 16 through a data line, and Matlab software is used on the computer 16 to analyze and process the transmitted data. By analyzing the phase change of the optical signal in three directions of the X axis, the Y axis and the Z axis, the magnetic field intensity component in each direction can be obtained. Because the directions of the isomagnetic line and the magnetic induction line of the magnetic field are mutually perpendicular, the isomagnetic line of the magnetic field at the position where each vector optical fiber magnetic field sensor is located is drawn on the computer 16 through Matlab software, the distribution condition of the magnetic induction line of the space magnetic field in the environment can be correspondingly drawn, and the direction of the magnetic field can be obtained by analyzing the tangential direction of each point on the magnetic induction line.
The above embodiments are described in an optimized form of the present invention, and not intended to limit the scope of the present invention, and various modifications and improvements of the technical fields of the model of the present invention may be made by those skilled in the art without departing from the design spirit of the present invention, and all of them fall within the protection scope defined by the claims of the present invention.
Claims (7)
1. Distributed optical fiber magnetic field sensor based on magnetostrictive effect, characterized by comprising: the device comprises a single-mode fiber (1), a first shell (2.1), a second shell (2.2), a first groove (3.1), a second groove (3.2), an epoxy resin block (4), a Terfenol-D block (5), a magnetic field response FBG (6), a temperature compensation FBG (7) and a buffer sheet (8);
the first shell (2.1) is provided with a plurality of first threaded holes, the second shell (2.2) is provided with the first groove (3.1) and the second groove (3.2) along the axial direction of the second shell (2.2), and the second shell (2.2) is provided with second threaded holes corresponding to the first threaded holes;
the magnetic field response FBG (6) and the temperature compensation FBG (7) are distributed on the single-mode fiber (1) along the axial direction of the single-mode fiber (1), and the single-mode fiber (1) is placed through the first groove (3.1) and the second groove (3.2);
the Terfenol-D block (5) is placed on the magnetic field response FBG (6) and embedded in the first groove (3.1), the epoxy resin (4) is placed on the temperature compensation FBG (6) and embedded in the second groove (3.2), and the buffer sheet (8) is arranged on the epoxy resin (4) and the upper layer of the Terfenol-D block (5);
the first housing (2.1) covers the second housing (2.2).
2. The distributed optical fiber magnetic field sensor based on the magnetostrictive effect according to claim 1, characterized in that the magnetic field response FBG (6) and the temperature compensation FBG (7) are micro-nano fiber gratings which are etched.
3. Distributed fibre-optic magnetic field sensor based on the magnetostrictive effect according to claim 1, characterized in that the direction of the stretching of the Terfenol-D block (5) is perpendicular to the axial direction of the single-mode fibre (1).
4. Distributed fiber-optic magnetic field sensor based on the magnetostrictive effect according to claim 1, characterized in that the buffer sheet (8) is a polydimethylsiloxane sheet to protect the epoxy (4) and the Terfenol-D block (5) from being damaged by compression.
5. Distributed fibre-optic magnetic field sensor based on the magnetostrictive effect according to claim 1, characterized in that the first housing (2.1) and the second housing (2.2) are both polytetrafluoroethylene encapsulating housings.
6. A distributed vector optical fiber magnetic field sensor based on magnetostrictive effect, comprising: three distributed fiber-optic magnetic field sensors (12) based on the magnetostrictive effect according to any one of claims 1 to 5, a fixed base (11) and a cylindrical housing (10); the three optical fiber magnetic field sensors (12) are all arranged on the fixed base (11), the three optical fiber magnetic field sensors (12) are distributed in an XYZ three-axis mode, and the fixed base (11) is arranged on the inner side wall of the cylindrical shell (10).
7. A distributed measurement system is characterized by comprising a light source (13) and a fiber demodulator (15), wherein a single-mode fiber (1) is connected to a plurality of ports of the light source (13), a plurality of distributed fiber vector magnetic field sensors (14) based on the magnetostrictive effect according to claim 6 are cascaded through the single-mode fiber (1) to form a distributed vector fiber magnetic field sensor array, and then the single-mode fiber (1) is connected to a plurality of ports of the fiber demodulator (15) to form the vector fiber magnetic field sensor distributed measurement system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115469135A (en) * | 2022-10-17 | 2022-12-13 | 云南电网有限责任公司电力科学研究院 | Fiber grating current sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115469135A (en) * | 2022-10-17 | 2022-12-13 | 云南电网有限责任公司电力科学研究院 | Fiber grating current sensor |
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