CN103048512B - Sensing optical fiber ring and Sagnac type all-fiber current transformer - Google Patents
Sensing optical fiber ring and Sagnac type all-fiber current transformer Download PDFInfo
- Publication number
- CN103048512B CN103048512B CN201210560126.5A CN201210560126A CN103048512B CN 103048512 B CN103048512 B CN 103048512B CN 201210560126 A CN201210560126 A CN 201210560126A CN 103048512 B CN103048512 B CN 103048512B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- section
- fiber
- round
- reduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention provides a sensing optical fiber ring and an all-fiber current transformer based on the sensing optical fiber ring. The sensing optical fiber ring uses two torsion optical fibers with the same torsion structure and length and an inverse torsion direction of a linear polarization maintaining optical fiber; one ends of the two torsion optical fibers are fused at an angle of 0 degree; one non-fused ends of the torsion optical fibers are respectively used as two external ends of the entire sensing optical fiber ring; the two torsion optical fibers are wound on a coil framework in the same direction by using a fusing position as a start point; a start point of a start rotation section of each torsion optical fiber and a start point of a speed-reducing rotation section of each torsion optical fiber are located at the same axial wire of the coil framework; and an end point of the start rotation section of each torsion optical fiber and an end point of the speed-reducing rotation section of each torsion optical fiber are located at the same axial wire of the coil framework. With the adoption of the sensing optical fiber ring provided by the invention, the influence on the measurement of the all-fiber current transformer caused by properties of a lambda/4 wave plate can be avoided; and meanwhile, the measurement error of the all-fiber current transformer, caused by the Sagnac effect, can be removed, so that the ubiquitous technical difficult problem of the all-fiber current transformer can be solved.
Description
Technical field
The present invention relates to a kind of sensor fibre structure and preparation method thereof, and adopt the Sagnac formula all-fiber current transformator of this kind of sensor fibre.
Background technology
Along with the improving constantly of line voltage grade in electric system, capacity constantly increase and the informationization of intelligent grid, digitizing, robotization, interactive requirement, conventional current mutual inductor exposes major defect gradually, and more and more can not meet the demand for development of electric system, therefore the research of optical current mutual inductor is extremely urgent.The magneto-optic glass fiber utilizing magneto-optic glass to be drawn into makes novel all-fiber current transformator, based on faraday (Frarday) effect, the shortcoming of conventional current mutual inductor can be overcome to a certain extent, progressively will replace traditional current transformer and one of main means becoming power network monitoring.The principle of all-fiber current transformator is the Faraday effect (FaradayEffect) based on light, namely in the external rings of tested Ampereconductors around the optical fiber of the suitable number of turns, when there being electric current to flow through conductor, the magnetic field produced around it will make transmission light wave polarization direction in optical fiber change.Can be expressed as
wherein, H is by the magnetic field of sensing, and L is the length of sensor fibre in magnetic field, and V is Fil moral (Verdet) coefficient of sensor fibre, and θ is the angle of light-wave electric field deflection in optical fiber.
Current domestic You Duojia unit is engaged in the research of optical fiber current mutual inductor, although the optical fiber current mutual inductor of indivedual enterprise has entered production and hanging net operation stage, repeatability and the long-time stability of properties of product are also faced with acid test.Ultralow refraction optical fiber is after being bent and making sensing fiber ring, create extra linear birefringence, and this linear birefringence is strongly depend on the environmental factors such as temperature, add the impact of the easy factor such as vibrated of optical fiber itself, the light polarization extremely unstable transmitted, the sensor fibre being therefore suitable for all-fiber current transformator is the key of the research of optical fiber current mutual inductor.
Sensor fibre in existing reflecting type full-optical fiber current mutual inductor, if application number is mention in the Chinese utility model patent of 200910262107.2, material is linear birefringence polarization maintaining optical fibre, there is one section of non rotating section, one section of transferred section (spiral speed ascent stage) and one section at the uniform velocity rotation section and catoptron successively.But the swing of optical fiber each several part is different, Fil moral (Verdet) coefficient of diverse location is not quite similar.In the transferred section that length is L, the Verdet coefficient on each position point is all not identical, but slowly increases along fiber spiral increase direction, and institute just becomes with the formula
wherein H is by the magnetic field of sensing, and L is the length of sensor fibre in magnetic field, and V is the Verdet coefficient of sensor fibre, and θ is the angle of light-wave electric field deflection in optical fiber.Because Verdet coefficient depends on the position in sensor fibre, when conductor wire is in the diverse location around sensor fibre, the phase place change obtained thus will be different.This just makes this sensor fibre by the position influence of current lead, does not thus possess good antijamming capability, is not suitable for practical application.
Application number be 201120417236.7 Chinese utility model patent devise a kind of sensing fiber ring, solve the sensor fibre of aforementioned patent (application number is 200910262107.2) to locus sensitive issue, but still there are some very important problems in this patent.
Because current lead is placed in the optional position in described fiber optic loop, so the temperature variation that on sensor fibre, each point causes electric current is not identical, because sensor fibre itself is comparatively responsive to temperature, this will introduce certain phase error.Anti-interference and degree of stability are difficult to ensure.
Secondly, the optical fiber current mutual inductor of this patent is a kind of Sagnac formula optical fiber current mutual inductor.Sagnac formula optical fiber current mutual inductor not only has the feature of current sensor but also has the feature of Sagnac formula sensor, that is, this sensor can Sensitive Current again can responsive Sagnac effect.Sagnac effect refers to, when light beam advances in a circular passage, if this circular passage is rotated, time required for advancing along the direction that passage rotates is more than the time of rotating along passage required for contrary direction advance, two-beam can produce optical path difference, and optical path difference size is directly proportional to circular passage rotating speed.It can thus be appreciated that Sagnac formula sensor is a kind of angular-rate sensor, to vibrating or rotating very responsive.High-tension line is distributed in outdoor, and owing to blowing or vibrating, high-voltage conducting wires can rock, thus causes current transformer transducing part to vibrate, and Sagnac formula fibre optic current sensor transducing part sensitivity, to vibration, exports and changes thereupon.Because this defect, Sagnac formula sensor exporting change cannot distinguish the change of electric current in external environment impact or high-voltage conducting wires itself, has had a strong impact on the measurement accuracy of current transformer, cannot be practical.
Summary of the invention
The invention provides a kind of sensing fiber ring and the all-fiber current transformator based on this sensing fiber ring.This sensing fiber ring improves the integrated level of all-fiber current transformator system by the special sensor fibre of the present invention and winding structure thereof, avoids the impact that λ/4 wave plate performance is measured all-fiber current transformator; Eliminate the measuring error that Sagnac effect causes all-fiber current transformator simultaneously, solve the ubiquitous technical barrier of all-fiber current transformator.
For realizing above goal of the invention, the invention provides following technical scheme.
A kind of sensing fiber ring, comprises and turns round optical fiber and coil rack, described in turn round optical fiber be reversed by line polarization maintaining optical fibre to form, comprised successively according to spinning rate rotating section, at the uniform velocity rotating section and reduction of speed rotation section; It is symmetrical structure (length are namely equal and speed of rotation is symmetry equivalent) along optical fiber integrally direction that described rotation section and reduction of speed rotate section, and wherein, at the uniform velocity the length of the section of rotation accounts for 60% to 90% of total length; It is characterized in that:
Described sensing fiber ring adopts contrary two of torsion structure only line identical with length polarization maintaining optical fibre torsional direction to turn round optical fiber, and (namely one is turned round optical fiber is reversed clockwise by line polarization maintaining optical fibre to make, it is reversed counterclockwise by line polarization maintaining optical fibre to make that another root turns round optical fiber), two one end turning round optical fiber are welded together with 0 °, two two external connection end of one end respectively as whole sensing fiber ring turning round the non-welding of optical fiber;
Two are turned round optical fiber is that starting point two-wire is wound on coil rack in the same way with weld, and ensureing that the starting point of starting point and reduction of speed rotation section that every root turns round a rotation section of optical fiber is positioned in the same axial line of coil rack, the terminal working terminal and the reduction of speed rotation section rotating section that every root turns round optical fiber is also positioned in the same axial line of coil rack.
Turn round that optical fiber is preferably parallel on coil rack to be sticked together for above-mentioned two.
The method for making of above-mentioned sensing fiber ring comprises the following steps:
1) adopt line polarization maintaining optical fibre to reverse to make above-mentioned two and turn round optical fiber, and turn round rising of optical fiber at two respectively and rotate section and reduction of speed and rotate the starting point of section and terminal makes marks;
2) two are turned round wherein one end of optical fiber with 0 ° of welding;
3) with two joints turning round optical fiber for sensor fibre two-wire is wound on coil rack by initiating terminal in the same way, refer step 1) starting mark that does and terminal mark, the starting point that the starting point that rotates section and reduction of speed rotate section that rises that (establish the first reduction of speed turning round optical fiber to rotate the terminal and second of section turns round optical fiber play the starting point welding rotating section) makes every root turn round optical fiber is positioned in the same axial line of coil rack, and the terminal of terminal and reduction of speed rotation section that every root turns round a rotation section of optical fiber is also positioned in the same axial line of coil rack.
Adopt an all-fiber current transformator for above-mentioned sensing fiber ring, comprise light source, photodetector, fiber coupler, had partially, light splitting and phase-modulation function light splitting plays inclined modulating device, line protects off-delay optical cable and above-mentioned sensing fiber ring; Described light source plays inclined modulating device with photodetector by fiber coupler and light splitting and is connected; Two output ports that light splitting plays inclined modulating device protect by corresponding line two external connection end that off-delay optical cable is connected to sensing fiber ring respectively, light splitting plays two bundles that inclined modulating device the separates linearly polarized light with polarization direction, and two contrary turning round in optical fiber of rotation direction that off-delay optical cable enters sensing fiber ring protected by the line respectively through correspondence.
Advantage of the present invention:
1. in all-fiber current transformator, current induced magnetic field is utilized the change of the velocity of propagation of the circularly polarized light propagated in the optical fiber be wound on around it to be realized to the detection of strength of current, therefore any precision and performance affecting the factors influence mutual inductor of optical polarization, wherein the incompleteness of λ/4 wave plate, temperature sensitivity and with optical fiber be main influence factor to axis error.What the present invention utilized special construction turns round the function that optical fiber can realize λ/4 wave plate, ellipse/circle polarization maintaining optical fibre and λ/2 wave plate, thus simplifies light path, improves the integration degree of system; Decrease because device accesses the decline of light path optical signal loss that the fusion point that increases brings and light polarization quality, solve the ubiquitous technical barrier of all-fiber current transformator.
2. optical fiber current mutual inductor of the present invention is to vibrating or rotating insensitive.Structure in the middle of the present invention's two optical fiber defines the function of half-wave plate, can eliminate the phase error of the all-fiber current transformator that sagnac effect causes.Solve the technical matters of the main error of all-fiber current transformator.When there is vibration or rotating, the half-wave plate that the fusion point turning round optical fiber with two is like this formed is boundary, because of Sagnac effect, light path is elongated in the first half sensor fibre for light wave, in later half sensor fibre, then because of Sagnac effect, light path shortens, sensor fibre mid point is equivalent to half-wave plate, and Sagnac effect is offset just completely.Therefore, optical fiber current mutual inductor of the present invention eliminates Sagnac effect, to vibrating or rotating insensitive.
3. present invention employs the method for two-wire coiling in the same way, the impact of external environment for sensor can be eliminated.When the two-beam ripple of forward and reverse transfer is by sensor fibre, two are turned round optical fiber is two-wire coiling in the same way, and therefore the factor such as ambient temperature, vibration is identical for the impact of two-beam ripple, and the measuring accuracy of all-fiber current transformator is improved.
4. in the present invention, the starting point of the starting point rising to rotate section and reduction of speed rotation section that two are turned round optical fiber is positioned in the same axial line of coil rack, can eliminate the tender subject of the Ampereconductors position that this sensor fibre each several part Verdet coefficient difference causes completely.This winding method is adopted more to be easy to realize in technique.
Accompanying drawing explanation
Fig. 1 forms the wherein structure turning round optical fiber of sensor fibre and light wave through polarization state change schematic diagram thereafter in the present invention.(this figure is intended to the polarization state characterizing each section, at the uniform velocity rotates in fact at a high speed the length of section 52 much larger than the length working the section of revolving 51 and reduction of speed rotation section 53.) work the starting mark a point that the section of revolving 51 and reduction of speed rotate section 53, work the section of revolving 51 and reduction of speed rotates the terminal of section 53 for mark b point.
To be the present invention by two turn round sensor fibre structure that optical fiber forms to Fig. 2 and light wave changes schematic diagram through polarization state thereafter.
Fig. 3 is sensor fibre of the present invention winding method schematic diagram on conductor.
Fig. 4 is the most preferred embodiment of all-fiber current transformator with using this sensor fibre to make and the change of polarization situation of light wave in sensor fibre.
Wherein, 1-light source, 2-fiber coupler, 3-Y waveguide fiber optical gyroscope, 4-postpones optical cable, 5-sensor fibre, and 51-works the section of revolving, and 52-is the section of rotation at the uniform velocity, and 53 reductions of speed rotate section, 6-current lead, 7-0 ° of fusion point, 8-photodetector.
Embodiment
All-fiber current sensor utilizes the Faraday effect realization of sensor fibre to measure, namely the magnetic field around tested wire to cause in sensor fibre the circularly polarized lights of the different rotation direction of two bundles with friction speed transmission thus produces phase differential, can the size of electric current in indirect inspection wire by measuring the signal amplitude after interfering.When two restraint the contrary circularly polarized light of rotation directions through magneto-optic optical fiber, due to Faraday effect, the velocity of propagation of two bundle circularly polarized lights change, and cause phase differential between two-beam to change.Just can the size of measure traverse line electric current indirectly by the change of measuring the interference light intensity between relevant two-beam.
Fig. 1 forms the wherein structure turning round optical fiber of sensor fibre and light wave through polarization state change schematic diagram thereafter.Turn round optical fiber structure and comprise following components: work the section of revolving 51, at the uniform velocity rotate section 52 and reduction of speed rotation section 53 at a high speed.Wherein playing rotation section is that spinning rate slowly changes to high speed rotation rate from zero, and it is that spinning rate slowly changes to zero from high speed rotation rate that reduction of speed rotates section.Rise and rotate section and reduction of speed to rotate section be symmetrical structure along optical fiber direction, both length are equal and speed of rotation is symmetrical identical, and at the uniform velocity the length of the section of rotation is far longer than other two part total lengths at a high speed.
When the incident this structure of linearly polarized light turn round optical fiber time, through rising the section of revolving 51 and at the uniform velocity after rotation section 52 in optical fiber light wave become circularly polarized light; Afterwards, light wave rotates after section 53 through reduction of speed and becomes linearly polarized light again.Because the length at the uniform velocity rotating at a high speed section 52 is longer, light wave mainly transmits with the form of ellipse/circularly polarized light in sensor fibre.Therefore, the function that optical fiber has quarter-wave plate and oval polarization maintaining optical fibre is turned round.
Fig. 2 turns round by two sensor fibre structure that optical fiber forms and light wave changes schematic diagram through polarization state thereafter.Linearly polarized light from the section of revolving incidence first turn round optical fiber, at the uniform velocity rotate at a high speed section at it and obtain ellipse/circularly polarized light, rotate section at its reduction of speed and obtain the linearly polarized light identical with incident light.The 0 ° of fusion point turning round optical fiber through two incides the section of revolving that second turns round optical fiber.The sense of rotation turning round optical fiber due to two is contrary, and therefore same linearly polarized light incidence works the section of revolving can obtain the contrary ellipse/circularly polarized light of rotation direction at the uniform velocity rotating at a high speed section, that is: obtain left-handed ellipse/circularly polarized light and right-handed elliptical/circularly polarized light respectively.Therefore, the second high speed turning round optical fiber at the uniform velocity the section of rotation obtain turning round the contrary ellipse/circularly polarized light of rotation direction in optical fiber with first.Such ellipse/circularly polarized light still can obtain the linearly polarized light identical with incident light after the reduction of speed that second turns round optical fiber rotates section.
Can be found out by the above analysis for light wave polarization state, it is with the contrary ellipse/circularly polarized light transmission of rotation direction that light wave turns round first High Rotation Speed section that optical fiber and second turns round optical fiber.Therefore, turn round fused fiber splice connecting place and be functionally similar to half-wave plate for two.
Fig. 3 is the schematic diagram be wound in the same way with the sensor fibre employing two-wire in Fig. 2 on conductor.Sensor fibre that optical fiber forms is turned round with two welds turning round optical fiber for starting point two-wire is wound on coil rack in the same way by two.First turns round optical fiber and second turns round optical fiber and is close together, and to respond to the change of external environment simultaneously, thus cancels out each other, improves the sensitivity of optical fiber current mutual inductor.Two various pieces turning round optical fiber: work the section of revolving 51, at the uniform velocity rotating section 52 and reduction of speed, to rotate section 53 overlapped.And the starting point making every root turn round the starting point and reduction of speed rotation section that rotate section of optical fiber is positioned in the same axial line of coil rack, and the terminal working terminal and the reduction of speed rotation section rotating section that every root turns round optical fiber is also positioned in the same axial line of coil rack.The sensing ring adopting such winding method to make has the insensitive characteristic of conductor position.
Turning round optical fiber brings a comparatively troublesome problem to be as the sensor fibre of optical fiber current mutual inductor: because the spinning rate difference turning round optical fiber each several part causes the Verdet coefficient of various piece different.Such conductor is different at the Verdet coefficient that diverse location is total, cause measurement result to be subject to the impact of the position of conductor, and such impact is almost fatal for optical fiber current mutual inductor, because Verdet coefficient can affect measurement result at double.In sensor fibre of the present invention, ensure that starting point and the reduction of speed rotation section starting point of rotation section are positioned in the same axial line of coil rack, to guarantee that any place total Verdet coefficient in overlapping region is a constant, and the same with the Verdet coefficient at the uniform velocity rotating at a high speed section optical fiber.Like this, in the same axial line of coil rack, sensing fiber ring Verdet coefficient is everywhere identical.Only in this way, just can guarantee that the position of measurement result and conductor has nothing to do, and realizes the Stability and veracity of tested electric current.
Turn round Verdet coefficient and the speed of rotation ξ direct proportionality of optical fiber.The Verdet coefficient at the uniform velocity rotating at a high speed section optical fiber is K ξ
max.First turns round optical fiber and second turns round optical fiber to work the Verdet coefficient rotating section l place sensor fibre identical, is:
Wherein L works the section of revolving total length, and l is this point and works the distance rotating section.
Because first turns round the rise section of revolving and the reduction of speed that optical fiber, second turns round optical fiber and rotate section along sensor fibre direction structure symmetry, and length is equal.Therefore, first turns round reduction of speed that optical fiber and second turns round optical fiber, and to rotate section l place optical fiber Verdet coefficient also identical, is:
Wherein L reduction of speed rotates section total length, and l is the distance that this point and reduction of speed rotate section starting point.
To rotate Duan Jun overlapping in the same axial line of coil rack for two the rise section of revolving and reductions of speed turning round optical fiber, and in this location overlap region, the Verdet coefficient of sensor fibre is 2K ξ
max.
In Fig. 3, front shows 10 sections of optical fiber, wherein two sections be first turn round that optical fiber and second turns round optical fiber work the section of revolving, two sections is first turn round optical fiber and second and turn round optical fiber reduction of speed and rotate section, and all the other six sections is the at a high speed at the uniform velocity section of rotation, and therefore total Verdet coefficient is 8K ξ.The back side has 8 sections of high speeds at the uniform velocity to rotate to turn round optical fiber, and Verdet coefficient is 8K ξ.In all directions of coil rack, the Verdet coefficient of sensor fibre is 8K ξ like this.
Here, Fig. 2 just gives a kind of simple, best sensor fibre structure, in fact also can adopt 2,3 and integral multiple such optical fiber structure, can reach same effect.Such as, when adopting two such structures, can by two such optical fiber structures after middle doubling as such structure, remaining winding method is identical with single sensor fibre.
Fig. 4 is the most preferred embodiment of all-fiber current transformator of the present invention.The light that LASER Light Source 1 sends one end after fiber coupler 2 is coupled with Y waveguide fiber optical gyroscope 3.Y waveguide fiber optical gyroscope 3 has realized partially, the function of light splitting and phase-modulation.Light wave coupling inlet wire through Y waveguide fiber optical gyroscope 3 protects off-delay optical cable 4, is coupled into the sensor fibre 5 of different rotation direction respectively.The polarization state that special construction due to this sensor fibre can realize light wave changes ellipse/circularly polarized light into by linearly polarized light, and two sense of rotation turning round optical fiber are contrary, thus two bundles entering this optical fiber are made to be converted to left-handed ellipse/circularly polarized light and right-handed elliptical/circularly polarized light respectively with linearly polarized light.Because the magnetic field around tested current lead 6 causes Faraday effect, this two bundles ellipse/circularly polarized light transmits with friction speed.What two sense of rotation were contrary turns round the function that fused fiber splice can play half-wave plate together, therefore after the fusion point 7 through two sensor fibres (turning round optical fiber), two polarization modes restrainting ellipse/circularly polarized lights there occurs exchange, and (namely left-handed ellipse/circularly polarized light becomes right-handed elliptical/circularly polarized light, right-handed elliptical/circularly polarized light becomes left-handed ellipse/circularly polarized light), again protect inclined sensor fibre 5 by circle, and the magnetic field interaction again produced with current lead 6, faraday's phase place of generation is doubled, Φ F=4VHl=VlI/ π r.This two-beam again through two sense of rotation contrary turn round optical fiber after become the polarization direction identical with incident light.Then two-beam ripple meets and interferes when transmission cable two-beam ripple gets back to Y waveguide fiber optical gyroscope 3 place, and interference signal turns back in photodetector 8 through fiber coupler 2.So, just accurately can measure the size of current by tested wire by the phase differential measured between this two-beam ripple.
Y waveguide fiber optical gyroscope 3 also can adopt several devices of separation as: the polarizer, fiber coupler and phase-modulator come together to realize its function.
The length turning round optical fiber is generally 2-3 rice, and during measurement small area analysis, length is 4-5 rice, and the minimum pitch turning round optic fibre turning is 1-10mm.
Adopt the sensor fibre of this special construction, in all-fiber current transformator, no longer need quarter-wave plate and half-wave plate, line is protected off-delay optical cable and is directly connected with sensor fibre.
Claims (4)
1. a sensing fiber ring, comprises and turns round optical fiber and coil rack, described in turn round optical fiber be by line polarization maintaining optical fibre reverse form, according to spinning rate comprised successively rotate section, at the uniform velocity rotate section and reduction of speed rotation section; It is symmetrical structure along optical fiber integrally direction that described rotation section and reduction of speed rotate section, and wherein, at the uniform velocity the length of the section of rotation accounts for 60% to 90% of total length; It is characterized in that:
Described sensing fiber ring adopts contrary two of torsion structure only line identical with length polarization maintaining optical fibre torsional direction to turn round optical fiber, two one end turning round optical fiber are welded together with 0 °, two two external connection end of one end respectively as whole sensing fiber ring turning round the non-welding of optical fiber;
Two are turned round optical fiber is that starting point two-wire is wound on coil rack in the same way with weld, and ensureing that the starting point of starting point and reduction of speed rotation section that every root turns round a rotation section of optical fiber is positioned in the same axial line of coil rack, the terminal working terminal and the reduction of speed rotation section rotating section that every root turns round optical fiber is also positioned in the same axial line of coil rack.
2. sensing fiber ring according to claim 1, is characterized in that: turn round that optical fiber is parallel on coil rack to be sticked together for two.
3. the method for making of sensing fiber ring according to claim 1, is characterized in that: comprise the following steps:
1) adopt line polarization maintaining optical fibre to reverse to make two as described in claim 1 and turn round optical fiber, and turn round rising of optical fiber at two respectively and rotate section and reduction of speed and rotate the starting point of section and terminal makes marks;
2) two are turned round wherein one end of optical fiber with 0 ° of welding;
3) joint turning round optical fiber with two is turned round optical fiber two-wire for initiating terminal by these two and is wound in the same way on coil rack, refer step 1) starting mark that does and terminal mark, the starting point making every root turn round the starting point and reduction of speed rotation section that rotate section of optical fiber is positioned in the same axial line of coil rack, and the terminal working terminal and the reduction of speed rotation section rotating section that every root turns round optical fiber is also positioned in the same axial line of coil rack.
4. all-fiber current transformator, is characterized in that: comprise light source, photodetector, fiber coupler, light splitting plays inclined modulating device, line protects off-delay optical cable and the sensing fiber ring described in claim 1; Described light splitting plays that inclined modulating device has possessed partially, light splitting and phase-modulation function; Described light source plays inclined modulating device with photodetector by fiber coupler and light splitting and is connected; Two output ports that light splitting plays inclined modulating device protect by corresponding line two external connection end that off-delay optical cable is connected to sensing fiber ring respectively, light splitting plays two bundles that inclined modulating device the separates linearly polarized light with polarization direction, and two contrary turning round in optical fiber of torsional direction that off-delay optical cable enters sensing fiber ring protected by the line respectively through correspondence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210560126.5A CN103048512B (en) | 2012-12-20 | 2012-12-20 | Sensing optical fiber ring and Sagnac type all-fiber current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210560126.5A CN103048512B (en) | 2012-12-20 | 2012-12-20 | Sensing optical fiber ring and Sagnac type all-fiber current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103048512A CN103048512A (en) | 2013-04-17 |
| CN103048512B true CN103048512B (en) | 2015-07-15 |
Family
ID=48061226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210560126.5A Active CN103048512B (en) | 2012-12-20 | 2012-12-20 | Sensing optical fiber ring and Sagnac type all-fiber current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103048512B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301302A (en) * | 2014-07-28 | 2016-02-03 | 北京自动化控制设备研究所 | High-precision all-fiber current transformer sensing coil manufacturing method |
| CN106546783B (en) * | 2015-09-17 | 2019-09-17 | 北京自动化控制设备研究所 | A kind of preparation method of exoskeletal polarization maintaining optical fibre ring retard |
| CN111510209B (en) * | 2020-04-10 | 2021-08-06 | 中国信息通信研究院 | Optical fiber vibration monitoring method and device |
| CN114002473A (en) * | 2021-10-27 | 2022-02-01 | 华中科技大学 | Temperature strain compensation type optical fiber current sensor |
| CN117310260B (en) * | 2023-11-28 | 2024-02-20 | 华中科技大学 | Phase gradient correction and light path difference wide-amplitude current measurement system and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203011983U (en) * | 2012-12-20 | 2013-06-19 | 中国科学院西安光学精密机械研究所 | Sensing optical fiber ring and Sagnac type an all-optical fiber current transformer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100141955A1 (en) * | 2008-12-04 | 2010-06-10 | Yong Huang | Sensor probe for fiber-based current sensor |
| CN101876723A (en) * | 2009-05-19 | 2010-11-03 | 姚竑杰 | Sensing fiber used in reflective all-fiber current sensor |
| CN101930019B (en) * | 2009-06-26 | 2013-08-14 | 中国科学院西安光学精密机械研究所 | Optical fiber current sensor and manufacturing method thereof |
| CN102393546B (en) * | 2011-10-27 | 2013-11-20 | 黄勇 | Sensing fiber, sensing fiber ring and through-type all-fiber current sensor |
-
2012
- 2012-12-20 CN CN201210560126.5A patent/CN103048512B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203011983U (en) * | 2012-12-20 | 2013-06-19 | 中国科学院西安光学精密机械研究所 | Sensing optical fiber ring and Sagnac type an all-optical fiber current transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103048512A (en) | 2013-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103048512B (en) | Sensing optical fiber ring and Sagnac type all-fiber current transformer | |
| CN101320055B (en) | Full optical fiber current sensor | |
| CN102539873B (en) | Coil of optical fiber current sensor and optical fiber current sensor | |
| CN105258745B (en) | Downhole optic fiber distributed traffic monitoring system | |
| CN107121083A (en) | A kind of asymmetric thick wimble structure less fundamental mode optical fibre strain transducer | |
| CN103017687A (en) | Orthogonal polarization fiber bragg grating vector torsion sensing device and detection method thereof | |
| CN101226210A (en) | Reflection type polarization irrespective miniaturization photo-electricity mutual-inductor | |
| CN102889979B (en) | Polarization crosstalk estimation and symmetry estimation method of optical fiber ring | |
| CN203011982U (en) | Sensing optical fiber ring and all-fiber current transformer | |
| CN102967740B (en) | All-fiber current transformer and current measuring method | |
| CN104374410A (en) | Measurement device and method for fiber loop fusion point reflection in photonic bandgap fiber gyroscope | |
| CN203011983U (en) | Sensing optical fiber ring and Sagnac type an all-optical fiber current transformer | |
| CN106546411A (en) | Polarization maintaining optical fibre Verdet constant measuring apparatus and method based on Mach Zehnder and Michelson interferometers | |
| CN107843758A (en) | A kind of two die drawings cone fibre optic current sensor and preparation method | |
| CN203084049U (en) | Sensing optical fiber ring and reflection type full-optical-fiber current transformer | |
| CN103063898B (en) | A kind of sensing fiber ring and all-fiber current transformator | |
| CN102269647B (en) | Device and method for testing polarization extinction ratio of polarization-maintaining fiber coupler based on resonator technology | |
| CN105301302A (en) | High-precision all-fiber current transformer sensing coil manufacturing method | |
| CN101833016B (en) | Micro-accelerometer sensor based on embedded core type twin-core polarization maintaining fiber | |
| CN203011984U (en) | Sensing optical fiber ring and vibration-proof Sagnac type all-optical fiber current transformer | |
| CN101923102A (en) | Fiber accelerometer based on Mach-Zehnder interferometer | |
| CN103412175B (en) | Photonic crystal fiber current magnetic field sensor and preparation thereof and measuring method | |
| CN103063896B (en) | Sensing fiber ring and shock type Sagnac formula all-fiber current transformator | |
| CN103063899B (en) | A kind of sensing fiber ring and reflecting type full-optical fiber current mutual inductor | |
| CN103063897B (en) | Sensing optical fiber coil and vibration-resistant type all-optical fiber current transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |