CN101833024A - Sensing head of fiber Bragg grating F-P current sensor and making method thereof - Google Patents
Sensing head of fiber Bragg grating F-P current sensor and making method thereof Download PDFInfo
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- CN101833024A CN101833024A CN200910021441A CN200910021441A CN101833024A CN 101833024 A CN101833024 A CN 101833024A CN 200910021441 A CN200910021441 A CN 200910021441A CN 200910021441 A CN200910021441 A CN 200910021441A CN 101833024 A CN101833024 A CN 101833024A
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Abstract
The invention relates to a sensing head of a fiber Bragg grating F-P current sensor and a making method thereof, wherein the sensing head is not influenced by temperature. By utilizing the characteristic of magnetic anisotropy of a magnetostrictive material on design, the sensing head of the sensor realizes the separation of the temperature strain and the magnetic field strain of the magnetostrictive material, solves the problems of cross sensitivity of temperature and strain of the magnetostrictive material, and filters the influences of the temperature change in the located environment of the sensing head on the measured result. The fiber Bragg grating F-P current sensor provided in the invention has high precision and good reliability, and since the sensing head is an all-fiber structure in the design, the fiber grating F-P current sensor solves the problem of electromagnetic insulation. The sensing head has the advantages of simple structure, easy manufacturing and small size so that the device has convenience and easy operation on on-line running, and can realize accurate monitoring on a transmission bus under a high-voltage environment.
Description
Technical field
The present invention relates to the Fibre Optical Sensor field, particularly relate to a kind of sensing head of fiber Bragg grating F-P current sensor of not temperature influence, also relate to its method for making.
Background technology
Current sensor is an important research direction of sensor field.In power industry, to test parameters such as the voltage of transmission line of electricity, electric current, power.But traditional electromagnetic sensor faces high pressure, insulating property are poor and problem such as electromagnetic interference (EMI), measures to the electricity sensitive element and has brought danger, also makes the complex structure, with high costs of measuring system.Some scholars have proposed fiber Bragg grating F-P (Fabry one Perot, Fabry-Perot) current sensor.Existing disclosed document " based on the current sensor of optical fiber Fabry-Perot (" University Of Chongqing's journal " (natural science edition); Vol.30; No.3; 2007; p23-30) " mentioned the current sensor of setting up with optical fiber Fabry-Perot, but thereby this sensor is because used iron core and coil to have magnetic hysteresis and inductance, to such an extent as to only be suitable for measuring little electric current.The current sensor that document " a kind of novel fiber grating Fabry-Perot current sensor system (" optical fiber and cable and application technology thereof " No.4; 2007; p 1 7-20) " is set up is not considered temperature and the stress cross sensitivity problem that used magnetostriction materials exist, thereby has reduced the reliability that this sensor uses under the outdoor environment temperature change condition.
Summary of the invention
The object of the present invention is to provide a kind of sensing head of fiber Bragg grating F-P current sensor, and the method for making the sensing head of this sensor.The magnetostriction materials temperature of the fine solution fiber Bragg grating F-P current sensor of fiber Bragg grating F-P current sensor energy of this not temperature influence and the cross sensitivity problem of stress.
The sensing head of fiber Bragg grating F-P current sensor of the present invention, the magnetostriction materials identical by two block of material closely link together, the magnetostriction direction of two blocks of magnetostriction materials is vertical mutually, fiber Bragg grating F-P sticks on two blocks above the magnetostriction materials, wherein half of fiber Bragg grating F-P FBG is located at wherein one block above the magnetostriction materials, and remainder is positioned at another above piece magnetostriction materials.
Described fiber Bragg grating F-P sticks on the central of magnetostriction materials and parallel with long limit, and the length of side of magnetostriction materials is 2～100mm, and thick is 0.5～20mm.
The manufacture craft of fiber Bragg grating F-P current sensor sensing head of the present invention comprises the steps:
1, chooses the fiber Bragg grating F-P of suitable parameters according to calculating;
2, choose the magnetostriction materials of appropriate length, carry out the surface of magnetostriction materials smooth bright and clean;
3, two blocks of magnetostriction materials are placed on the plane and stick with glue successively by Fig. 1 connect;
4, fiber Bragg grating F-P is sticked on the structural member upper surface.
Need before described fiber Bragg grating F-P uses to soak in acetone and took out in 10 minutes, scrub is used alcohol wipe again, and at the bonding light-conductive optic fibre in its two ends;
The magnetostriction coefficient of described magnetostriction materials and linear work interval and length satisfy measurement requirement; Need before using to spray degreaser on its surface, wiped clean is carefully polished with No. 1000 sand paper that are added with water base acid surfaces cleaning solution then, removes the acid clean liquid and the fine sand grain on surface again with the water base peracid sanitizer solution of basic surface.
Described magnetostriction materials stick with glue to connect needs to guarantee that its upper surface is in the same plane.
Described fiber grating is that, set strength little with thermal expansion is big, Stability Analysis of Structures, the epoxy glue that is difficult for aged deterioration are adhesively fixed in two magnetostriction materials surfaces.
The sensing head of current sensor of the present invention, the anisotropic characteristics of mangneto of magnetostriction materials have been utilized in the design, realized separating of magnetostriction materials temperature strain and magnetic field strain, finished the temperature strain of sensing head and the discrete measurement of magnetic field strain, solved the cross sensitivity problem of magnetostriction materials temperature and stress, filtering the influence that measured result is brought of the temperature variation of sensing head environment of living in, therefore precision height, the good reliability of fiber Bragg grating current sensor provided by the invention; And this design is an all optical fibre structure, has solved the solenoid isolation problem, particularly is better than traditional electromagnetic sensor in the high pressure field.The present invention is simple in structure, makes easily, and volume is little, makes that device is convenient on hanging net operation, simple, easy operating, and fiber grating has ripe demodulation techniques, easily realizes using.
Describe in further detail below in conjunction with the embodiment of accompanying drawing the sensing head of fiber Bragg grating F-P current sensor of the present invention.
Description of drawings
1-light-conductive optic fibre 2-magnetostriction materials 3-magnetostriction materials 4-fiber grating
The magnetostriction materials of the magnetostriction materials 6-surface fluting of 5-surface fluting
Fig. 1 is the structural representation of the sensing head embodiment one of fiber Bragg grating current sensor of the present invention.
Fig. 2 is the magnetostriction materials surface fluting synoptic diagram of embodiment of the present invention two.
Fig. 3 is the reflection spectrogram that does not add the fiber Bragg grating F-P of a magnetic field temperature influence.
Fig. 4 is that magnetic field and temperature effect produce fiber Bragg grating F-P after the division and the reflection peak figure of FBG.
Embodiment
Embodiment one:
Fig. 1 is the structural representation of the sensing head embodiment one of fiber Bragg grating current sensor of the present invention.The sensing head of described fiber Bragg grating F-P current sensor comprises light-conductive optic fibre 1, magnetostriction materials 2, magnetostriction materials 3, fiber grating 4.Described magnetostriction materials 2 are connected with magnetostriction materials 3 head and the tail, and fiber grating 4 is pasted from the teeth outwards fully.When temperature variation, whole drift can take place in the reflectance spectrum of fiber Bragg grating F-P; But the magnetostriction direction of magnetostriction materials 2 is parallel to outer magnetic field direction, the magnetostriction direction of magnetostriction materials 3 is perpendicular to outer magnetic field direction, external magnetic field changes then makes two different strains drive fiber gratings of magnetostriction materials generation make the reflectance spectrum of fiber grating be split into the reflection peak of a fiber Bragg grating F-P and the reflection peak of a FBG, the small peak spacing of the reflection peak of fiber Bragg grating F-P comprises the information in temperature and magnetic field simultaneously, the spacing of the reflection peak of FBG and the reflection peak of fiber Bragg grating F-P only comprises the information of temperature, can obtain bus magnitude of field intensity on every side by computing, just can calculate the size of current of high voltage power transmission bus again according to magnetic field intensity, thereby realize accurate monitoring the transmission of electricity bus.
The technology of the sensing head of described making fiber Bragg grating F-P current sensor comprises the steps:
1, chooses the fiber Bragg grating F-P of suitable parameters according to calculating;
2, choose the magnetostriction materials of appropriate length, carry out the surface of magnetostriction materials smooth bright and clean;
3, magnetostriction materials are placed to stick with glue on the plane by Fig. 1 connect;
4, fiber Bragg grating F-P is sticked on the structural member surface.
Describedly choose the step 1 of the fiber Bragg grating F-P of suitable parameters according to calculating, implementation process is: a, choose the long 40mm of grid, the foveal reflex wavelength is the fiber Bragg grating F-P of 1550nm; B, used light source are that centre wavelength is the wideband light source of 1550nm; C, fiber grating is soaked taking-up in 10 minutes in acetone, scrub is used alcohol wipe again, and at the bonding light-conductive optic fibre in its two ends.
The described magnetostriction materials of choosing appropriate length, and the surface of magnetostriction materials carried out smooth bright and clean step 2, implementation process is: measurement requirement must be satisfied in a, the magnetostriction coefficient of choosing magnetostriction materials and linear work interval, use giant magnetostrictive material Tb0.30Dy0.70Fe1.95, linear interval, the magnetic field of work is that the 20-100 milli is special; The size of b, two blocks of magnetostriction materials choosing is 20mm * 8mm * 4mm; C, wherein the magnetostriction direction of magnetostriction materials 2 must be parallel with the long limit of rectangular parallelepiped, and is vertical with the limit of other direction, and the magnetostriction direction of another piece magnetostriction materials 3 must be vertical with the long limit of rectangular parallelepiped, and is vertical with the limit of other direction; D, spray degreaser in the upper and lower surface of magnetostriction materials, wiped clean; E, usefulness are added with No. 1000 sand paper of water base acid surfaces cleaning solution and carefully polish; F, again with the water base peracid sanitizer solution of basic surface remove the surface acid clean liquid and fine sand grain.
Described magnetostriction materials are placed the step 3 that sticks with glue on the plane by Fig. 1, implementation process is: a, magnetostriction materials are positioned on the plane by Fig. 1; B, be coated with epoxy glue at its end face it is bondd, guarantee that its upper surface is in the same surface level.
Described fiber Bragg grating F-P is sticked on the lip-deep step 4 of structural member, implementation process is: a, little with thermal expansion, set strength big, Stability Analysis of Structures, be difficult for the epoxy glue of aged deterioration; B, epoxy glue are coated in smooth magnetostriction materials surface after bright and clean uniformly.Treat that institute's gluing solidifies and just finished design, obtained the sensing head of fiber Bragg grating F-P current sensor.
Embodiment two:
Fig. 2 is the structural representation of embodiment of the present invention two.Described fiber Bragg grating F-P current sensor sensing head structure and embodiment one are similar.Shown in Figure 2ly on the surface of magnetostriction materials 5 and magnetostriction materials 6, have groove,, fiber Bragg grating F-P is placed in the groove to stick with glue again the groove alignment of magnetostriction materials 5 and magnetostriction materials 6 and bonding successively.To reduce the influence of temperature on fiber grating F-P itself, increase the affinity of fiber Bragg grating F-P and magnetostriction materials, improve the strain-responsive of fiber Bragg grating F-P, can further improve measuring accuracy, reduce measuring error.
The technology of described making fiber Bragg grating F-P current sensor sensing head comprises the steps: successively
1, chooses the fiber Bragg grating F-P of suitable parameters according to calculating;
2, choose the magnetostriction materials of appropriate length, carry out the end face of magnetostriction materials smooth bright and clean;
3, magnetostriction materials are placed by Fig. 1 stick with glue knot on the plane;
4, fiber Bragg grating F-P is imbedded in the groove on magnetostriction materials surface.
Describedly choose the fiber Bragg grating F-P step 1 of suitable parameters according to calculating, implementation process is: a, choose the long 40mm of grid, the foveal reflex wavelength is the fiber Bragg grating F-P of 1550nm; B, used light source are that centre wavelength is the wideband light source of 1550nm; C, fiber Bragg grating F-P is soaked taking-up in 10 minutes in acetone, scrub is used alcohol wipe again, and at the bonding light-conductive optic fibre in its two ends.
The described magnetostriction materials of choosing appropriate length also carry out smooth bright and clean step 2 with the end face of magnetostriction materials, implementation process is: measurement requirement must be satisfied in a, the magnetostriction coefficient of choosing magnetostriction materials and linear work interval, use giant magnetostrictive material Tb0.30Dy0.70Fe1.95, linear interval, the magnetic field of work is that special-100 millis of 20 millis are special; The size of b, two blocks of magnetostriction materials choosing is 20mm * 8mm * 4mm; The magnetostriction direction of c, magnetostriction materials 5 must be parallel with the long limit of rectangular parallelepiped, and is vertical with the limit of other direction, and the magnetostriction direction of magnetostriction materials 6 must be vertical with the long limit of rectangular parallelepiped, and is vertical with the limit of other direction; D, two end faces at magnetostriction materials are sprayed degreaser, wiped clean; E, usefulness are added with No. 1000 sand paper of water base acid surfaces cleaning solution and carefully polish; F, again with the water base peracid sanitizer solution of basic surface remove the surface acid clean liquid and fine sand grain.
Described magnetostriction materials are placed by Fig. 1 sticks with glue the step 3 that connects on the plane, implementation process is: a, magnetostriction materials are positioned on the plane by Fig. 1; B, be coated with epoxy glue and it is bonding at its end face, guarantee the concave surface alignment of two grooves, upper surface is in the same surface level.
The present invention bonds together two blocks of identical magnetostriction materials and forms a structural member, again fiber Bragg grating F-P is sticked on the structural member surface.Because the thermal expansivity of structural member material therefor is identical, as shown in Figure 3, temperature variation only makes the reflectance spectrum integral body of fiber grating drift about; But the magnetostriction direction difference of two block of material, as shown in Figure 4, changes of magnetic field makes reflectance spectrum be split into the reflection peak of a fiber Bragg grating F-P and the reflection peak of a FBG, the small peak spacing of the reflection peak of fiber Bragg grating F-P comprises the information in temperature and magnetic field simultaneously, the spacing of the reflection peak of FBG and the reflection peak of fiber Bragg grating F-P only comprises the information of temperature, by computing, utilize the linear relationship between the stroke of electric current, magnetic field and magnetostriction materials just can reach the purpose of measuring electric current again.The measured value of this electric current is not subjected to the influence of variation of ambient temperature, so measuring accuracy height of fiber Bragg grating F-P current sensor sensing head provided by the invention, can realize under hyperbaric environment that the accurate monitoring of transmission of electricity bus is had great practical value and economic benefit in actual production.
Claims (6)
1. the sensing head of a fiber Bragg grating F-P current sensor, comprise magnetostriction materials and a fiber Bragg grating F-P that two block of material are identical, it is characterized in that: described two blocks of magnetostriction materials (2) and magnetostriction materials (3) closely bond with epoxy glue, and the magnetostriction direction is orthogonal.
2. the sensing head of a kind of fiber Bragg grating F-P current sensor according to claim 1 is characterized in that: magnetostriction materials are alloy materials that deformation takes place in can outside magnetic field, and the length of side is 2～100mm, and thick is 0.5～20mm.
3. the sensing head of a kind of fiber Bragg grating F-P current sensor according to claim 1 is characterized in that: described fiber Bragg grating F-P sticks on the upper surface middle part of two blocks of magnetostriction materials and parallel with long limit.
4. one kind prepares sensing head of fiber Bragg grating F-P current sensor as claimed in claim 1 and preparation method thereof, it is characterized in that this process comprises:
(a) choose suitable fiber Bragg grating F-P;
(b) choose the magnetostriction materials of appropriate length, carry out the surface of magnetostriction materials smooth bright and clean;
(c) magnetostriction materials are placed on the glass plate and stick with glue successively by Fig. 1 connect;
(d) fiber Bragg grating F-P sticks on the structural member upper surface.
5. sensing head of a kind of fiber Bragg grating F-P current sensor according to claim 4 and preparation method thereof, it is characterized in that: described fiber grating is to choose the long 40mm of grid, and the foveal reflex wavelength is the fiber grating of 1550nm.
6. sensing head of a kind of fiber Bragg grating F-P current sensor according to claim 4 and preparation method thereof is characterized in that: the length of two blocks of magnetostriction materials equals long half of fiber grating grid, and its size is 20mm * 8mm * 4mm.
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| CN200910021441A CN101833024A (en) | 2009-03-09 | 2009-03-09 | Sensing head of fiber Bragg grating F-P current sensor and making method thereof |
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| CN200910021441A CN101833024A (en) | 2009-03-09 | 2009-03-09 | Sensing head of fiber Bragg grating F-P current sensor and making method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107917674A (en) * | 2017-12-25 | 2018-04-17 | 北京信息科技大学 | FP and II type FBG compound sensors for high temperature strain measurement |
| CN110988603A (en) * | 2019-12-25 | 2020-04-10 | 武汉三相电力科技有限公司 | Digital differential interval protection method and system based on fiber bragg grating |
| CN111473811A (en) * | 2020-05-08 | 2020-07-31 | 武汉理工大学 | Synchronous current and temperature measuring system for optical fiber F-P/FBG composite cavity |
| 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 |
| CN115825519A (en) * | 2023-01-05 | 2023-03-21 | 哈尔滨理工大学 | Measurement system of cantilever beam type extrinsic optical fiber double-Fabry-Perot current transformer |
-
2009
- 2009-03-09 CN CN200910021441A patent/CN101833024A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107917674A (en) * | 2017-12-25 | 2018-04-17 | 北京信息科技大学 | FP and II type FBG compound sensors for high temperature strain measurement |
| CN110988603A (en) * | 2019-12-25 | 2020-04-10 | 武汉三相电力科技有限公司 | Digital differential interval protection method and system based on fiber bragg grating |
| CN111473811A (en) * | 2020-05-08 | 2020-07-31 | 武汉理工大学 | Synchronous current and temperature measuring system for optical fiber F-P/FBG composite cavity |
| 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 |
| CN115825519A (en) * | 2023-01-05 | 2023-03-21 | 哈尔滨理工大学 | Measurement system of cantilever beam type extrinsic optical fiber double-Fabry-Perot current transformer |
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Open date: 20100915 |