CN101833022A - Sensing head of fiber Bragg grating current sensor and making method thereof - Google Patents
Sensing head of fiber Bragg grating current sensor and making method thereof Download PDFInfo
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- CN101833022A CN101833022A CN200910021442A CN200910021442A CN101833022A CN 101833022 A CN101833022 A CN 101833022A CN 200910021442 A CN200910021442 A CN 200910021442A CN 200910021442 A CN200910021442 A CN 200910021442A CN 101833022 A CN101833022 A CN 101833022A
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Abstract
The invention relates to a sensing head of a fiber Bragg grating current sensor and a making method thereof. Through the symmetrical design of two pieces of L-shaped quartz glass, a first magnetostrictive material and two magnetostrictive materials, when ambient temperature changes, the two magnetostrictive materials both expand when heated and contracted when cooled, because the sum of the lengths of the two magnetostrictive materials is equal to the length of the first magnetostrictive material, the expansion extents caused by temperature for the first magnetostrictive material and the second magnetostrictive materials are same, but the first magnetostrictive material and the second magnetostrictive materials have opposite extension or shortening directions so that the distance between the two second magnetostrictive materials is not changed, i.e. the temperature change can not result in the strain of a grating, and meanwhile, a temperature compensation material eliminates the thermo-optic effect of an FBG (Fiber Bragg Grating), thereby eliminating the influence of the ambient temperature on the magnetostrictive materials and the grating. The sensing head of the fiber Bragg grating current sensor in the invention has the advantages of high precision, good reliability and simple preparation method, can realize accurate monitoring on a transmission bus under a high-voltage environment and has greatly practical value and economic benefit in actual production.
Description
Technical field
The invention belongs to the Fibre Optical Sensor field, specifically, relate to a kind of sensing head of fiber Bragg grating current sensor, also relate to its method for making.
Background technology
Along with development of electric power industry, the electric pressure and the strength of current of electrical power transmission system are more and more higher, traditional current transformer because make that complicated, insulation difficulty, maintenance cost are high, deficiencies such as magnetic saturation and ferroresonance, can not satisfy the requirement of the novel measurement index of electric system gradually.Fiber Bragg grating current sensor is the class New type of current sensor that recent development is got up, because advantages such as its miniaturization, good insulating, precision height, anti-electromagnetic interference (EMI) are measured its high-voltage large current in electric system and are had very important researching value and application prospect.Existing open source literature " theory of Fiber Bragg Grating FBG current sense and experimental study (" optics journal " Vol.22; No.9; 2002; p1092-1094) " and " fiber Bragg grating current sensor (" sensing technology journal "; No.3; 2000, p174-176) " have all provided a kind of fiber Bragg grating current sensor.But because also problem such as temperature influence of the temperature-strain cross sensitivity problem of FBG and giant magnetostrictive material itself causes temperature variation bigger to the measurement result influence, measurement result is relatively poor, therefore can not directly apply to the current measurement of outdoor environment.
Summary of the invention
The object of the present invention is to provide sensing head of a kind of fiber Bragg grating current sensor that can effectively filtering temperature effect and preparation method thereof.Thereby avoid also problem such as temperature influence of the temperature-strain cross sensitivity problem of FBG and giant magnetostrictive material itself.
The sensing head of the fiber Bragg grating current sensor that the present invention proposes comprises that two blocks of L shaped quartz glasss, first magnetostriction materials, two blocks of second magnetostriction materials, a fiber grating pass optical element, a deblocking temperature compensative material and some light-conductive optic fibres.Described two blocks of L shaped quartz glasss are fixed on the first magnetostriction materials two ends, two second magnetostriction materials are fixed on the inboard of two blocks of L shaped quartz glasss separately, leave a spacing between two second magnetostriction materials, a L shaped quartz glass bends puts a deblocking temperature compensative material between inboard and second magnetostriction materials; The biography light of fiber grating partly is bonded in the second magnetostriction materials surface, and grating places between two second magnetostriction materials, and some light-conductive optic fibres are connected in fiber grating respectively and pass light optical fiber two ends.
Inboard two surfaces of the bending of described two blocks of L shaped quartz glasss are respectively first 11, second 12, be parallel to first and with second adjacent end face be the 3rd 13, the 3rd is connected and fixed respectively with the first magnetostriction materials two ends, and first is connected and fixed with an end of second magnetostriction materials respectively.
First 11 and first 11 of described two blocks of L shaped quartz glasss are oppositely arranged, and the 3rd 13 and the 3rd 13 are oppositely arranged, two L shaped quartz glass equal and opposite in directions, and the length between first and the 3rd equals half of fiber grating length.L shaped quartz glass can be the combination of some blocks of quartz glasss.
The magnetostriction direction of described second magnetostriction materials is vertical mutually with first magnetostriction materials, and length is its half; Two second magnetostriction materials and L shaped quartz glass second is parallel, between spacing to equal the grid of fiber grating long;
Described first magnetostriction materials are thick to be 3～10mm, and the length that is clipped between the 3rd is 10～80mm;
Described second magnetostriction materials are thick to be 3～7mm, and length is 5～40mm; Spacing between two second magnetostriction materials is 6～40mm; The thickness of temperature compensation material is 0.2～10mm;
Second length of described two blocks of L shaped quartz glasss is 3～20mm;
Described fiber grating two ends comprise some pins, and are connected with light-conductive optic fibre by these some pins.
The concrete steps of sensing head of the fiber Bragg grating current sensor that the present invention proposes and preparation method thereof are:
(1) chooses a fiber grating of suitable parameters, first magnetostriction materials, two blocks of second magnetostriction materials, two blocks of L shaped quartz glasss and some light-conductive optic fibres;
(2) with the 3rd of two blocks of L shaped quartz glasss respectively with the end face bonding connection of first magnetostriction materials;
(3) with two second magnetostriction materials respectively with first bonding connection of corresponding L shaped quartz glass separately, and the temperature compensation material adhesive therein between one second magnetostriction materials and the corresponding L shaped quartz glass thereof;
(4) light-conductive optic fibre is connected with the pin at fiber grating two ends;
(5) fiber grating is bonded between two second magnetostriction materials.
Need before described fiber grating uses in acetone, to soak 10 minutes, take out scrub and use alcohol wipe again, and at the bonding light-conductive optic fibre in its two ends.Described fiber grating is to be adhesively fixed in the second magnetostriction materials surface by epoxy glue.
Described suitable magnetostriction materials are that the magnetostriction coefficient of selected magnetostriction materials and linear work interval and length satisfy measurement requirement;
The magnetostriction direction of described first magnetostriction materials is parallel to outer magnetic field direction, and the magnetostriction direction of second magnetostriction materials is perpendicular to first magnetostriction materials;
What all need before first magnetostriction materials, second magnetostriction materials use sprays degreaser on its surface, wiped clean; Carefully polish with No. 1000 sand paper that are added with water base acid surfaces cleaning solution then; Remove the acid clean liquid and the fine sand grain on surface again with the water base peracid sanitizer solution of basic surface.
The invention has the beneficial effects as follows: because the sensing head structure of fiber Bragg grating current sensor of the present invention is symmetrical, when variation of ambient temperature, magnetostriction materials all expand with heat and contract with cold, but the elongation of first magnetostriction materials and second magnetostriction materials (shortening) direction is opposite, and the length sum of two second magnetostriction materials is consistent with the length of first magnetostriction materials, therefore the spacing between two second magnetostriction materials does not change, the influence of fiber grating expanded by heating and thermo-optic effect is compensated by the temperature compensation material, thereby can eliminate the influence of environment temperature.The present invention simultaneously can amplify measurement result, so precision height, the good reliability of fiber Bragg grating current sensor provided by the invention, and data are accurate.
Description of drawings
Below in conjunction with drawings and embodiments the present invention is described in further detail.
Fig. 1 is the structural representation of fiber Bragg grating current sensor sensing head embodiment one of the present invention.
Fig. 2 is the structural representation of fiber Bragg grating current sensor sensing head embodiment two of the present invention.
Fig. 3 is the array mode of quartz glass in the embodiment of the present invention 2.
The 3rd of second 13-of first 12-of 1-quartz glass 3-quartz glass 11-
The 2-first magnetostriction materials 5-second magnetostriction materials 7-second magnetostriction materials
6-fiber grating 4-light-conductive optic fibre 8-light-conductive optic fibre 9-quartz glass 10-quartz glass
14-temperature compensation material.
Embodiment
Embodiment one:
Fig. 1 is the structural representation of fiber-optic grating sensor sensing head embodiment one of the present invention.Described fiber-optic grating sensor sensing head comprises that two blocks of quartz glasss 1,3, one piece first magnetostriction materials 2, two pieces second magnetostriction materials 5,7, fiber grating pass optical element 6 and some light-conductive optic fibres 4,8, temperature compensation material 14.Described quartz glass 1, quartz glass 3 are L shaped, and the inboard surface of its bending is respectively first 11, second 12, the 3rd 13.Between first 11 of quartz glass 1, the 3rd 13 and quartz glass 3 first 11, the 3rd 13 is to be provided with in opposite directions mutually.Described first magnetostriction materials 2 two ends are connected with the 3rd 13 of two blocks of quartz glasss 1,3 respectively.Described two second magnetostriction materials 5,7 end separately are fixedly connected with the 3rd 13 of two blocks of quartz glasss 1,3 respectively, and the other end is oppositely arranged, wherein the middle laying temperature compensative material 14 of the L shaped quartz glass and second magnetostriction materials.Other two second magnetostriction materials 5,7 are parallel with second 12, and the length of second magnetostriction materials 3 is half of first magnetostriction materials 2.The magnetostriction direction of described first magnetostriction materials 2 and second magnetostriction materials 5,7 is vertical mutually, and promptly the magnetostriction direction of first magnetostriction materials 2 is parallel with external magnetic field, and therefore strain takes place; The magnetostriction direction of second magnetostriction materials 5,7 is vertical with the outfield, and therefore strain does not take place.Described fiber grating 6 is arranged on the spacing of two second magnetostriction materials 5,7, is bonded in the surface of two second magnetostriction materials 5,7 by epoxy glue.Some pins of described fiber grating 6 connect light-conductive optic fibre 4 and the light-conductive optic fibre 8 corresponding with it.
When variation of ambient temperature, raise as temperature, first magnetostriction materials 2 and two second magnetostriction materials 5,7 heat expansion elongation all takes place, the 3rd 13 of two blocks of L shaped quartz glasss 1,3 that are connected with first magnetostriction materials 2, together with second magnetostriction materials 5 that are bonded on its first 11,7 will outwards stretch along the two ends of first magnetostriction materials, and the free end of second magnetostriction materials 5,7 that an end and L shaped quartz glass 1 join then inwardly stretches in the other direction.Two second magnetostriction materials 5, the 7 length sums of stretching are the same with the length that first magnetostriction materials 2 stretch, add that quartz glass 1,3 thermal expansivity is minimum, to temperature-insensitive, so quartz glass 1,3 expansion can be ignored, and the width of the spacing between two second magnetostriction materials 5,7 of result remains unchanged, thereby compensation temperature is to the influence of first magnetostriction materials 2 and two second magnetostriction materials 5,7.The temperature rising causes the thermo-optical coeffecient variation of grating that the foveal reflex wavelength is drifted about to the long wave direction, and temperature compensation material 14 expanded by heating have reduced second magnetostriction materials 5,7 spacing, the foveal reflex wavelength that makes grating is to the drift of shortwave direction, thus the foveal reflex wave length shift that the thermo-optical coeffecient of counteracting grating causes; Otherwise, when reducing temperature compensation material 14, temperature shrinks, second magnetostriction materials 5 have been increased, 7 spacing, the foveal reflex wavelength of grating is drifted about to the long wave direction, compensation temperature reduces the foveal reflex wavelength that causes the thermo-optical coeffecient variation to cause drifts about to the shortwave direction, finally reaches the purpose of temperature compensation
When fiber Bragg grating current sensor sensing head provided by the invention is worked, adding under the action of a magnetic field, because first magnetostriction materials, 2 flexible directions are parallel with external magnetic field, thereby magnetic elongation, two blocks of L shaped quartz glasss 1 that are connected with first magnetostriction materials 2, the 3rd 13 of 3 will be outwards mobile along the two ends of first magnetostriction materials together with second magnetostriction materials 5,7 that are bonded on its first 11.The length that is fixed on second magnetostriction materials 5,7 on 1,3 first 11 of the L shaped quartz glass does not then change, and therefore the spacing between two second magnetostriction materials 5,7 strengthens, and elongation equates with the elongation of first magnetostriction materials 2.Since fiber Bragg grating current sensor sensing head of the present invention design can compensation temperature to the flexible influence of magnetic materials, therefore the variation of spacing has reflected the magnetostriction effect of magnetic field to first magnetostriction materials 2 comparatively accurately between two second magnetostriction materials 5,7.Thereby be arranged on second magnetostriction materials 5, fiber grating 6 between 7 is owing to be subjected to second magnetostriction materials 5,7 stretching and deformation takes place, make the centre wavelength of reflection wave of fiber grating drift about, and by light-conductive optic fibre 4, the drift value of 8 its foveal reflex wavelength of observation, just can obtain the deformation of fiber grating 6, and accurately obtain two second magnetostriction materials 5 in view of the above, the length variations amount of the spacing between 7, thereby obtain corresponding magnetic field intensity, can calculate the size of high voltage bus electric current, thereby realize accurate monitoring the transmission of electricity bus according to magnetic field intensity.
Because fiber Bragg grating current sensor sensing head structural symmetry provided by the present invention, when variation of ambient temperature, three blocks of magnetostriction materials all expand with heat and contract with cold, and because two second magnetostriction materials 5,7 length sum is consistent with the length of first magnetostriction materials 2, therefore the degrees of expansion of first and second magnetostriction materials that cause of temperature is the same, i.e. two second magnetostriction materials 5, spacing between 7 does not become, use the thermo-optic effect of temperature compensation material eliminates FBG simultaneously, thereby can eliminate the influence of environment temperature, therefore, the precision height of fiber Bragg grating current sensor sensing head provided by the invention.
Embodiment two:
Referring to Fig. 2, fiber Bragg grating current sensor sensing head structure is similar to embodiment one in the present embodiment.As shown in Figure 3, for the ease of processing and fabricating, L shaped quartz glass 1 and L shaped quartz glass 3 respectively are to be made of two blocks of quartz glasss 9 and quartz glass 10.Quartz glass 9 is arranged at first magnetostriction materials, 2 two ends respectively, and quartz glass 10 is bonded in quartz glass 9 outsides, and long than quartz glass 9, and both form L shaped.The part that described quartz glass 10 exceeds quartz glass 9 is provided with 5,7, two second magnetostriction materials 5,7 of second magnetostriction materials and is oppositely arranged.The temperature compensation material places between second magnetostriction materials 5 and the L shaped quartz.6 bonding connections of optical fiber grating sensing element are between two second magnetostriction materials 5,7, and its two ends are connected with some light-conductive optic fibres 4, light-conductive optic fibre 8.
The fiber Bragg grating current sensor sensing head of this embodiment also can be eliminated the influence of environment temperature to magnetostriction materials by the design of two second magnetostriction materials and first magnetostriction materials, has very high precision and actual application value.
The length that first magnetostriction materials 2 of fiber Bragg grating current sensor sensing head provided by the present invention are clipped between two the 3rd 13 is 40mm, desirable scope is 10～80mm, its thickness is 5mm along the length of first 11 direction promptly, and desirable scope is 3～10mm.The length that described second magnetostriction materials 5,7 are clipped between two first 11 is 5～40mm, its thickness 3～7mm, and 1,3 second 12 length along the direction of first magnetostriction materials 2 of described quartz glass is 5mm, desirable scope is 3～20mm.Described temperature compensation material clip thick between second magnetostriction materials 5 and L shaped quartz is 1.5mm, desirable scope 0.5～20mm.Void pitch between described two second magnetostriction materials 5,7 is 10mm, and desirable scope is 1～50mm.The width of described material is 15mm.
The manufacture craft of fiber Bragg grating current sensor sensing head of the present invention comprises:
(1). choose a fiber grating 6 of suitable parameters, one piece first magnetostriction materials 2, a deblocking temperature compensative material 14, two blocks of second magnetostriction materials 5,7, two blocks of L shaped quartz glasss 1,3 and some light-conductive optic fibres 4,8, fiber grating 6 is cleaned up, first magnetostriction materials 2 and second magnetostriction materials, 5,7 surfaces are carried out smooth smoothing processing;
(2). with the 3rd 13 of two blocks of L shaped quartz glasss 1,3 respectively with the both ends of the surface bonding connection of first magnetostriction materials 2;
(3). with two second magnetostriction materials 5,7 respectively with first 11 bonding connection of corresponding L shaped quartz glass 1,3 separately, temperature compensation material 14 places the centre of second magnetostriction materials 5 and L shaped quartz glass;
(4). light-conductive optic fibre 4,8 connects the two ends with fiber grating 6 respectively;
(5). fiber grating 6 usefulness epoxy glues are sticked on two second magnetostriction materials 5,7 surfaces, connect two second magnetostriction materials 5,7.
The described implementation process of choosing suitable fiber grating 6 and scrub is:
A. choose the long 10mm of suitable grid, the foveal reflex wavelength is the fiber grating of 1550nm;
B. choosing centre wavelength is the wideband light source of 1550nm;
Described choose the magnetostriction materials of appropriate length and smooth bright and clean implementation process carried out on the surface of magnetostriction materials be:
A. choose the magnetostriction coefficient and the linear work interval of magnetostriction materials and must satisfy measurement requirement, with giant magnetostrictive material (Tb0.30Dy0.70Fe1.95),
The length sum of two second magnetostriction materials of b. choosing 5,7 equals the length of first magnetostriction materials 2, and its size is 5mm * 15mm * 4mm;
C. the magnetostriction direction of first magnetostriction materials 2 must be parallel with its long limit, promptly must be vertical with the flexible direction of first magnetostriction materials 2 perpendicular to the magnetostriction direction of the 3rd 13, the second magnetostriction materials 5,7 of quartz glass;
D. spray degreaser in the upper and lower surface of magnetostriction materials, wiped clean;
E. carefully polish with No. 1000 sand paper that are added with water base acid surfaces cleaning solution;
F. remove the acid clean liquid and the fine sand grain on surface again with the water base peracid sanitizer solution of basic surface.
Wherein with the end face separately of two second magnetostriction materials 5,7 respectively with first of quartz glass 1,3 separately with epoxy glue when bonding, the surface that guarantee two second magnetostriction materials 5,7 is beneficial to the bonding of fiber grating 6 in same surface level.
Epoxy glue need be coated with evenly on smooth second magnetostriction materials, 5,7 surfaces after bright and clean when described fiber grating 6 sticks on structural member surperficial, guarantee that fiber grating 6 is in smooth surface level, when being implemented in stretching stressed evenly.Selected epoxy glue requires thermal expansion little, and set strength is big, and Stability Analysis of Structures is difficult for aged deterioration.
The embodiment two of described fiber Bragg grating current sensor sensing head is similar to the preparation method of the embodiment one of fiber Bragg grating current sensor sensing head.
Claims (8)
1. fiber Bragg grating current sensor sensing head, comprise that two blocks of L shaped quartz glasss, first magnetostriction materials, two second magnetostriction materials, a deblocking temperature compensative material, fiber gratings pass optical element and some light-conductive optic fibres, it is characterized in that: L shaped quartz glass (1) and L shaped quartz glass (3) are fixed on first magnetostriction materials (2) two ends; One end of second magnetostriction materials (5) and second magnetostriction materials (7) is fixed on the inboard of two blocks of L shaped quartz glasss separately, leaves a spacing between two second magnetostriction materials; Temperature compensation material (14) places between one second magnetostriction materials and the corresponding L shaped quartz glass thereof; The biography light of fiber grating partly is bonded in the second magnetostriction materials surface, grating places two second magnetostriction materials (5,7) between, light-conductive optic fibre (4) and light-conductive optic fibre (8) are connected in fiber grating (6) two ends respectively, and are connected by these some pins.
2. fiber Bragg grating current sensor sensing head according to claim 1, it is characterized in that: the bending inboard of two blocks of L shaped quartz glasss is parallel to first (11) and an end face adjacent with second (12) is the 3rd (13), fixedly connected respectively with first magnetostriction materials (2) two ends the 3rd (13), first (11) respectively with second magnetostriction materials (5,7) a end is fixedly connected, between quartz glass first (11) and the 3rd (13) to equal the grid of fiber grating (6) apart from sum long.
3. fiber Bragg grating current sensor sensing head according to claim 1 is characterized in that: described second magnetostriction materials (5,7) length sum must equal the length of first magnetostriction materials (2);
4. fiber Bragg grating current sensor sensing head according to claim 1 is characterized in that: the length that described first magnetostriction materials (2) are clipped between two the 3rd (13) is 10～80mm, and thick is 3～10mm.
5. fiber Bragg grating current sensor sensing head according to claim 1 is characterized in that: the length that described second magnetostriction materials are clipped between two first respectively is 5～40mm, and thick is 3～7mm.
6 fiber Bragg grating current sensor sensing heads according to claim 1 is characterized in that: described quartz glass second (12) is 3～20mm along the length of the direction of first magnetostriction materials.
7. fiber Bragg grating current sensor sensing head according to claim 1 is characterized in that: the thickness of described temperature compensation material is 0.5～20mm.
8. fiber Bragg grating current sensor sensing head according to claim 1 is characterized in that: the spacing between described two second magnetostriction materials is 6～40mm.
9. a method for preparing the described fiber Bragg grating current sensor sensing head of claim 1 is characterized in that comprising the steps:
(a) choose a fiber grating of suitable parameters, first magnetostriction materials, two blocks of second magnetostriction materials, two blocks of L shaped quartz glasss and some light-conductive optic fibres according to calculating;
(b) the 3rd of two blocks of L shaped quartz glasss the respectively with the end face bonding connection of first magnetostriction materials;
(c) two second magnetostriction materials respectively with first bonding connection of corresponding L shaped quartz glass separately, and the temperature compensation material is bonded in wherein between one second magnetostriction materials and the corresponding L shaped quartz glass thereof;
(d) pin of light-conductive optic fibre with the fiber grating two ends is connected;
(e) fiber grating is sticked between two second magnetostriction materials.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954822A (en) * | 2014-05-12 | 2014-07-30 | 上海电缆研究所 | Fiber bragg grating alternating current sensor |
| CN108196208A (en) * | 2018-02-07 | 2018-06-22 | 大连理工大学 | A kind of ultra-magnetic telescopic magnetic field sensor based on new micro fiber-optic grating sensor |
-
2009
- 2009-03-09 CN CN200910021442A patent/CN101833022A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954822A (en) * | 2014-05-12 | 2014-07-30 | 上海电缆研究所 | Fiber bragg grating alternating current sensor |
| CN108196208A (en) * | 2018-02-07 | 2018-06-22 | 大连理工大学 | A kind of ultra-magnetic telescopic magnetic field sensor based on new micro fiber-optic grating sensor |
| CN108196208B (en) * | 2018-02-07 | 2024-02-06 | 大连理工大学 | Super magnetostriction magnetic field sensor based on novel miniature fiber bragg grating sensor |
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Open date: 20100915 |