CN203011983U - Sensing optical fiber ring and Sagnac type an all-optical fiber current transformer - Google Patents
Sensing optical fiber ring and Sagnac type an all-optical fiber current transformer Download PDFInfo
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- CN203011983U CN203011983U CN 201220711772 CN201220711772U CN203011983U CN 203011983 U CN203011983 U CN 203011983U CN 201220711772 CN201220711772 CN 201220711772 CN 201220711772 U CN201220711772 U CN 201220711772U CN 203011983 U CN203011983 U CN 203011983U
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Abstract
The utility model provides a sensing optical fiber ring and an all-fiber current transformer based on the same. According to the sensing optical fiber ring, two twisted optical fibers that have the same twisted structures and lengths but different twisting directions of line polarization maintaining optical fibers are employed; one ends of the two twisted optical fibers are welded by 0 degree; and the unwelded ends of the two twisted fibers respectively serve as two external connection terminals of the whole sensing optical fiber ring. With the welding part as a starting point, the two twisted optical fibers are wound on a coil skeleton along a same direction in two lines; the starting point of an initial rotation segment and the starting point of a speed reduction rotating segment of each twisted optical fiber are ensured on one axial line of the coil skeleton; and the terminal point of the initial rotation segment and the terminal point of the speed reduction rotating segment of each twisted optical fiber are kept on the same axial line of the coil skeleton. According to the utility model, the influence of the lambda/4 wave plate performance on all-fiber current transformer measurement can be avoided. At the same time, the all-fiber current transformer measurement error caused by a Sagnac effect can be eliminated, so that the technical problems widely existing in all-fiber current transformers are solved.
Description
Technical field
The utility model relates to a kind of sensor fibre structure, and the Sagnac formula all-fiber current transformator that adopts this kind sensor fibre.
Background technology
Along with the improving constantly of line voltage grade in electric system, capacity constantly increases and the informationization of intelligent grid, digitizing, robotization, interactive requirement, the conventional current mutual inductor has exposed major defect gradually, and more and more can not satisfy the demand for development of electric system, so the research of optical current mutual inductor is extremely urgent.Utilize the magneto-optic glass fiber that magneto-optic glass is drawn into to make novel all-fiber current transformator, take faraday (Frarday) effect as the basis, can overcome to a certain extent the shortcoming of conventional current mutual inductor, will progressively replace traditional current transformer and become one of main means of power network monitoring.The principle of all-fiber current transformator is based on the Faraday effect (FaradayEffect) of light, namely at the optical fiber of the suitable number of turns of outer most surrounding of tested Ampereconductors, when having electric current to flow through conductor, the magnetic field that produces around it will make the interior transmission light wave polarization direction of 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.
The domestic research that has many units to be engaged in optical fiber current mutual inductor at present, although the optical fiber current mutual inductor of indivedual enterprises has entered production and hanging net operation stage, the repeatability of properties of product and long-time stability also are faced with acid test.Ultralow refraction optical fiber be bent make sensing fiber ring after, produced extra linear birefringence, and this linear birefringence depends on the environmental factors such as temperature strongly, add the easily impact of the factor such as vibrated of optical fiber itself, therefore the light polarization of transmitting is extremely unstable, and being suitable for the sensor fibre that all-fiber current transformator uses is the key of the research of optical fiber current mutual inductor.
Sensor fibre in existing reflecting type full-optical fiber current mutual inductor, be to mention in 200910262107.2 Chinese utility model patent as application number, material is the linear birefringence polarization maintaining optical fibre, has successively one section or not of rotation, one section transferred section (spiral speed ascent stage) and one section at the uniform velocity rotation section and catoptron.But the swing of optical fiber each several part is different, and Fil moral (Verdet) coefficient of diverse location is not quite similar.In length was the transferred section of L, the Verdet coefficient on each location point was all not identical, slowly increased but increase direction along fiber spiral, so formula just becomes
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 was in diverse location around sensor fibre, the phase place that obtains thus changes will be different.This just makes this sensor fibre be subjected to the position influence of current lead, thereby does not possess good antijamming capability, is not suitable for practical application.
Application number is that 201120417236.7 Chinese utility model patent has designed a kind of sensing fiber ring, solved the sensor fibre of aforementioned patent (application number is 200910262107.2) to the locus sensitive issue, but still there are some very important problems in this patent.
Because current lead is placed in optional position in described fiber optic loop, so on sensor fibre, each point is not identical to the temperature variation that electric current causes, because sensor fibre itself is comparatively responsive to temperature, this will introduce certain phase error.Anti-interference and degree of stability are difficult to guarantee.
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 characteristics of current sensor but also has the characteristics of Sagnac formula sensor, that is to say, this sensor can responsive electric current again can responsive Sagnac effect.The Sagnac effect refers to, when light beam advances in a circular passage, if rotate this circular passage, the direction of rotating along passage needed time of advancing is more than the needed time of advancing along the opposite direction of passage rotation, two-beam can produce optical path difference, and the optical path difference size is directly proportional to the circular passage rotating speed.Hence one can see that, and Sagnac formula sensor is a kind of angular-rate sensor, very responsive to vibration or rotation.High-tension line is distributed in outdoor, and owing to blowing or vibrating, high-voltage conducting wires can rock, thereby causes the vibration of current transformer transducing part, and Sagnac formula fibre optic current sensor transducing part is responsive to vibration, and output changes thereupon.Because this defective, Sagnac formula sensor exporting change can't be distinguished the variation of electric current in external environment impact or high-voltage conducting wires itself, had a strong impact on the measurement accuracy of current transformer, can't be practical.
The utility model content
The utility model provides a kind of sensing fiber ring and based on the all-fiber current transformator of this sensing fiber ring.This sensing fiber ring is by the integrated level that the special sensor fibre of the utility model and winding structure thereof have improved the all-fiber current transformator system, the impact of having avoided λ/4 wave plate performance that all-fiber current transformator is measured; Eliminate simultaneously the measuring error that the Sagnac effect causes all-fiber current transformator, solved the ubiquitous technical barrier of all-fiber current transformator.
For realizing above utility model purpose, the utility model provides following technical scheme.
A kind of sensing fiber ring comprises and turns round optical fiber and coil rack, and the described optical fiber of turning round is to be reversed by the line polarization maintaining optical fibre to form, and has comprised successively rotation section, at the uniform velocity rotation section and reduction of speed rotation section according to reversing speed; Described rotation section and reduction of speed rotation section are symmetrical structure (being that both are equal in length and speed of rotation is symmetry equivalent) along the optical fiber integrally direction, and wherein, at the uniform velocity the length of rotation section accounts for 60% to 90% of total length; It is characterized in that:
Described sensing fiber ring adopt opposite two of torsion structure only line identical with length polarization maintaining optical fibre torsional direction turn round optical fiber (namely one turn round optical fiber be by the line polarization maintaining optical fibre clockwise torsion make, it is to be reversed counterclockwise by the line polarization maintaining optical fibre to make that another root is turned round optical fiber), two ends of turning round optical fiber are welded together with 0 °, two turn round optical fiber not an end of welding respectively as two external connection end of whole sensing fiber ring;
Turning round optical fiber for two is wound on coil rack take weld as the starting point two-wire in the same way, and guarantee that every is turned round the starting point that plays the rotation section of optical fiber and the starting point of reduction of speed rotation section is positioned on the same axial line of coil rack, turn round the terminal point that plays the rotation section of optical fiber and the terminal point of reduction of speed rotation section also is positioned on the same axial line of coil rack for every.
Turn round optical fiber best parallel sticking together on coil rack for above-mentioned two.
The method for making of above-mentioned sensing fiber ring comprises the following steps:
1) adopt the line polarization maintaining optical fibre to reverse to make above-mentioned two and turn round optical fiber, and make marks at two starting point and terminal points of playing rotation section and reduction of speed rotation section of turning round optical fiber respectively;
2) with two wherein ends of turning round optical fiber with 0 ° of welding;
3) be wound in the same way the sensor fibre two-wire on coil rack take two joints of turning round optical fiber as initiating terminal, refer step 1) starting mark of doing and terminal point mark, (establishing the starting point welding that plays the rotation section that the first terminal point and second of turning round the reduction of speed rotation section of optical fiber is turned round optical fiber) makes every to turn round the starting point that plays the rotation section of optical fiber and the starting point of reduction of speed rotation section is positioned on the same axial line of coil rack, and the terminal point of every terminal point that plays the rotation section of turning round optical fiber and reduction of speed rotation section also is positioned on the same axial line of coil rack.
A kind of all-fiber current transformator that adopts above-mentioned sensing fiber ring comprises light source, photodetector, fiber coupler, has had partially, the light splitting of light splitting and phase-modulation function plays offset device processed, line is protected off-delay optical cable and above-mentioned sensing fiber ring; Described light source plays offset device processed with photodetector by fiber coupler and light splitting and is connected; Light splitting plays two output ports of offset device processed and protects by the line of correspondence two external connection end that the off-delay optical cable is connected to respectively sensing fiber ring, light splitting plays two linearly polarized lights of restrainting with the polarization direction that offset device processed is told, and protects through corresponding line two opposite turning round in optical fiber of rotation direction that the off-delay optical cable enters sensing fiber ring respectively.
Advantage of the present utility model:
1. in all-fiber current transformator, utilize electric current to produce magnetic field and realize the detection of strength of current for the change of the velocity of propagation that is wound on the circularly polarized light of propagating in its optical fiber on every side, therefore any precision and performance that affects the factors influence mutual inductor of optical polarization, wherein the incompleteness of λ/4 wave plates, temperature sensitivity and with optical fiber be main influence factor to axis error.The utility model utilizes the function that optical fiber can be realized λ/4 wave plates, ellipse/circle polarization maintaining optical fibre and λ/2 wave plates of turning round of special construction, thereby has simplified light path, improves the integrated degree of system; The light path light signal loss that the fusion point that having reduced increases because of the device access brings and the decline of light polarization quality have solved the ubiquitous technical barrier of all-fiber current transformator.
2. optical fiber current mutual inductor of the present utility model is to vibrating or rotating insensitive.Structure in the middle of two optical fiber of the utility model has formed the function of half-wave plate, can eliminate the phase error of the all-fiber current transformator that the sagnac effect causes.Solved the technical matters of the main error of all-fiber current transformator.When vibration-generating or rotation, the half-wave plate that forms take two fusion points of turning round optical fiber like this is as boundary, light wave is elongated because of Sagnac effect light path in the first half sensor fibre, shorten because of Sagnac effect light path in the later half sensor fibre, the sensor fibre mid point is equivalent to half-wave plate, and the Sagnac effect is offset just fully.Therefore, optical fiber current mutual inductor of the present utility model has been eliminated the Sagnac effect, to vibrating or rotating insensitive.
3. the utility model has adopted the two-wire method of coiling in the same way, can eliminate external environment for the impact of sensor.The two-beam ripple of forward and reverse transfer is when the sensor fibre, and two are turned round optical fiber is two-wire coiling in the same way, so the factors such as ambient temperature, vibration are identical for the impact of two-beam ripple, and the measuring accuracy of all-fiber current transformator is improved.
In the utility model two turn round the starting point that plays the rotation section of optical fiber and the starting point of reduction of speed rotation section is positioned on the same axial line of coil rack, the tender subject of the Ampereconductors position that can eliminate fully that this sensor fibre each several part Verdet coefficient difference causes.Adopt this winding method more to be easy to realize on technique.
Description of drawings
Fig. 1 consists of wherein structure of turning round optical fiber of sensor fibre and light wave to change schematic diagram through thereafter polarization state in the utility model.(this figure is intended to characterize the polarization state of each section, and the length of at the uniform velocity rotation section 52 is much larger than the length that works the section of revolving 51 and reduction of speed rotation section 53 in fact at a high speed.) work the starting mark a point of the section of revolving 51 and reduction of speed rotation section 53, working the section of revolving 51 and reduction of speed, to rotate sections 53 terminal point be mark b point.
To be the utility model turn round sensor fibre structure that optical fiber consists of and light wave by two to Fig. 2 changes schematic diagram through thereafter polarization state.
Fig. 3 is the utility model sensor fibre winding method schematic diagram on conductor.
Fig. 4 is most preferred embodiment and the change of polarization situation of light wave in sensor fibre with the all-fiber current transformator that uses this sensor fibre to make.
Wherein, the 1-light source, the 2-fiber coupler, 3-Y waveguide fiber optical gyroscope, 4-postpones optical cable, the 5-sensor fibre, 51-works the section of revolving, and 52-is the section of rotation at the uniform velocity, 53 reduction of speed rotation sections, 6-current lead, 7-0 ° of fusion point, 8-photodetector.
Embodiment
The Faraday effect of sensor fibre of utilizing all-fiber current sensor realizes measurement, be that magnetic field around tested wire causes that thereby the circularly polarized lights of the two different rotation directions of bundle in sensor fibre produce phase differential with the friction speed transmission, the signal amplitude after interfering by measurement is the size of electric current in measure traverse line indirectly.When two restrainted the opposite 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 changed, and cause that between two-beam, phase differential changes.Variation by measuring the interference light intensity between relevant two-beam is the size of measure traverse line electric current indirectly just.
Fig. 1 consists of wherein structure of turning round optical fiber of sensor fibre and light wave to change schematic diagram through thereafter polarization state.Turn round optical fiber structure and comprise following components: work the section of revolving 51, at the uniform velocity rotation section of high speed 52 and reduction of speed rotation section 53.Wherein play the rotation section for reversing speed from the zero High Rotation Speed speed that slowly changes to, reduction of speed rotation section slowly changes to zero for reversing speed from High Rotation Speed speed.Play the rotation section and reduction of speed rotation section is symmetrical structure along the optical fiber direction, both are equal in length and speed of rotation is symmetrical identical, and at the uniform velocity the length of rotation section is far longer than other two part total lengths at a high speed.
When this structure of linearly polarized light incident turn round optical fiber the time, through 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 becomes again linearly polarized light after rotating section 53 through reduction of speed.Because the length of at the uniform velocity rotating at a high speed section 52 is longer, light wave is main form transmission with ellipse/circularly polarized light in sensor fibre.Therefore, turn round the function that optical fiber has quarter-wave plate and oval polarization maintaining optical fibre.
Fig. 2 turns round sensor fibre structure that optical fiber consists of and light wave by two and changes schematic diagram through thereafter polarization state.Linearly polarized light from the section of revolving incident first turn round optical fiber, its at a high speed at the uniform velocity rotation section obtain ellipse/circularly polarized light, obtain the linearly polarized light identical with incident light in its reduction of speed rotation section.Incide the second section of revolving that rises of turning round optical fiber through two 0 ° of fusion points turning round optical fiber.Because two sense of rotation of turning round optical fiber are opposite, therefore same linearly polarized light incident works the section of revolving and can obtain the opposite ellipse/circularly polarized light of rotation direction at the uniform velocity rotation section of high speed, obtains respectively left-handed ellipse/circularly polarized light and dextrorotation ellipse/circularly polarized light that is:.Therefore, the second high speed of turning round optical fiber at the uniform velocity the section of rotation obtain the ellipse/circularly polarized light opposite with rotation direction during first turns round optical fiber.Such ellipse/circularly polarized light still can obtain the linearly polarized light identical with incident light after rotating section through the second reduction of speed of turning round optical fiber.
Can find out by above analysis for the light wave polarization state, light wave is turned round optical fiber and second first, and to turn round the High Rotation Speed section of optical fiber be with the transmission of the opposite ellipse of rotation direction/circularly polarized light.Therefore, turn round the fused fiber splice connecting place be similar to half-wave plate on function for two.
Fig. 3 adopts two-wire to be wound in the same way schematic diagram on conductor with the sensor fibre in Fig. 2.Turning round by two sensor fibre that optical fiber consists of is wound on coil rack in the same way take two welds of turning round optical fiber as the starting point two-wire.First turns round optical fiber and second turns round optical fiber and is close together, and responding to simultaneously the variation of external environment, thereby cancels out each other, and improves the sensitivity of optical fiber current mutual inductor.Two various pieces of turning round optical fiber: work the section of revolving 51, at the uniform velocity rotation section 52 and reduction of speed rotation section 53 overlapped.And make every to turn round the starting point that plays the rotation section of optical fiber and the starting point of reduction of speed rotation section is positioned on the same axial line of coil rack, turn round the terminal point that plays the rotation section of optical fiber and the terminal point of reduction of speed rotation section also is positioned on the same axial line of coil rack for every.The sensing ring that adopts such winding method to make has the insensitive characteristic of conductor position.
Turn round optical fiber as the sensor fibre of optical fiber current mutual inductor bring one comparatively the problem of trouble be: because the torsion speed difference of turning round the optical fiber each several part causes the Verdet coefficient of various piece different.Conductor is different at the total Verdet coefficient of diverse location like this, cause that measurement result is 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 utility model, the starting point and the reduction of speed rotation section starting point that have guaranteed the rotation section are positioned on the same axial line of coil rack, guaranteeing the total Verdet coefficient of overlapping region any place as a constant, and the same with the Verdet coefficient of at the uniform velocity rotation section optical fiber at a high speed.Like this, on the same axial line of coil rack, sensing fiber ring Verdet coefficient everywhere is identical.Only in this way, just can guarantee the location independent of measurement result and conductor, realize the Stability and veracity of tested electric current.
Turn round Verdet coefficient and the speed of rotation ξ relation in direct ratio of optical fiber.The Verdet coefficient of at the uniform velocity rotation section optical fiber is K ξ at a high speed
maxFirst turns round optical fiber and second turns round optical fiber to play the Verdet coefficient of rotation section l place sensor fibre identical, is:
Wherein L works the section of revolving total length, and l is this point and the distance that plays the rotation section.
Due to first turn round optical fiber, second turn round optical fiber rise the section of revolving with reduction of speed rotation section along sensor fibre direction structure symmetry, and equal in length.Therefore, first turns round optical fiber and second, and to turn round the reduction of speed rotation section l place optical fiber Verdet coefficient of optical fiber also identical, is:
Wherein the L reduction of speed rotates the section total length, and l is the distance of this point and reduction of speed rotation section starting point.
To rotate Duan Jun overlapping on the same axial line of coil rack for two the rise sections of revolving and reductions of speed of turning round optical fiber, and the Verdet coefficient of sensor fibre is 2K ξ in this location overlap zone
max
In Fig. 3, the front shows 10 sections optical fiber, and wherein two sections is first to turn round the section of revolving that rises that optical fiber and second is turned round optical fiber, and two sections is first to turn round optical fiber and second and turn round optical fiber reduction of speed rotation section, and all the other six sections be at the uniform velocity rotation section at a high speed, so total Verdet coefficient is 8K ξ.The back side has 8 sections high speeds at the uniform velocity to rotate to turn round optical fiber, and Verdet coefficient is 8K ξ.The Verdet coefficient of sensor fibre is 8K ξ on all directions of coil rack like this.
Here, Fig. 2 has just provided 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.When for example adopting two such structures, can with two such optical fiber structures after the middle doubling as such structure, remaining winding method gets final product with the identical of single sensor fibre.
Fig. 4 is the most preferred embodiment of all-fiber current transformator of the present utility model.The light that LASER Light Source 1 is sent is an end and 3 couplings of Y waveguide fiber optical gyroscope after fiber coupler 2.Y waveguide fiber optical gyroscope 3 has been realized partially, the function of light splitting and phase-modulation.Light wave coupling inlet wire through Y waveguide fiber optical gyroscope 3 is protected off-delay optical cable 4, is coupled into respectively the sensor fibre 5 of different rotation directions.Because the special construction of this sensor fibre can be realized the polarization state of light wave and changes ellipse/circularly polarized light into by linearly polarized light, and two sense of rotation of turning round optical fiber are opposite, thereby make two bundles that enter this optical fiber be converted to respectively left-handed ellipse/circularly polarized light and dextrorotation ellipse/circularly polarized light 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.Two sense of rotation are opposite turns round fused fiber splice and can play the function of half-wave plate together, therefore after the fusion point 7 through two sensor fibres (turning round optical fiber), exchange has occured the polarization mode of two bundle ellipse/circularly polarized lights (is that left-handed ellipse/circularly polarized light becomes dextrorotation ellipse/circularly polarized light, dextrorotation ellipse/circularly polarized light becomes left-handed ellipse/circularly polarized light), again protect inclined to one side sensor fibre 5 by circle, and the magnetic field interaction that again produces 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 opposite turn round optical fiber after become the polarization direction identical with incident light.Then the two-beam ripple meets when transmission cable two-beam ripple is got back to Y waveguide fiber optical gyroscope 3 place and interferes, and interference signal turns back in photodetector 8 through fiber coupler 2.So, just can accurately measure size of current by tested wire by measuring phase differential between this two-beam ripple.
Several devices that Y waveguide fiber optical gyroscope 3 also can adopt separation as: the polarizer, fiber coupler and phase-modulator come together to realize its function.
The length of turning round optical fiber is generally 2-3 rice, and when measuring little electric current, length is 4-5 rice, and the minimum pitch of turning round optic fibre turning is 1-10mm.
Adopt the sensor fibre of this special construction, no longer need quarter-wave plate and half-wave plate in all-fiber current transformator, line is protected the off-delay optical cable and directly is connected with sensor fibre.
Claims (3)
1. a sensing fiber ring, comprise and turn round optical fiber and coil rack, and the described optical fiber of turning round is to be reversed by the line polarization maintaining optical fibre to form, and has comprised successively rotation section, at the uniform velocity rotation section and reduction of speed rotation section according to reversing speed; Described rotation section and reduction of speed rotation section are symmetrical structure along the optical fiber integrally direction, and wherein, at the uniform velocity the length of rotation section accounts for 60% to 90% of total length; It is characterized in that:
Turn round optical fiber for two that described sensing fiber ring employing torsion structure only line identical with length polarization maintaining optical fibre torsional direction is opposite, two ends of turning round optical fiber are welded together with 0 °, two turn round optical fiber not an end of welding respectively as two external connection end of whole sensing fiber ring;
Turning round optical fiber for two is wound on coil rack take weld as the starting point two-wire in the same way, and guarantee that every is turned round the starting point that plays the rotation section of optical fiber and the starting point of reduction of speed rotation section is positioned on the same axial line of coil rack, turn round the terminal point that plays the rotation section of optical fiber and the terminal point of reduction of speed rotation section also is positioned on the same axial line of coil rack for every.
2. sensing fiber ring according to claim 1, is characterized in that: turn round optical fiber parallel sticking together on coil rack for two.
3. all-fiber current transformator is characterized in that: comprise light source, photodetector, fiber coupler, had partially, the light splitting of light splitting and phase-modulation function plays offset device processed, line is protected the sensing fiber ring described in off-delay optical cable and claim 1; Described light source plays offset device processed with photodetector by fiber coupler and light splitting and is connected; Light splitting plays two output ports of offset device processed and protects by the line of correspondence two external connection end that the off-delay optical cable is connected to respectively sensing fiber ring, light splitting plays two linearly polarized lights of restrainting with the polarization direction that offset device processed is told, and protects through corresponding line two opposite turning round in optical fiber of rotation direction that the off-delay optical cable enters sensing fiber ring respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220711772 CN203011983U (en) | 2012-12-20 | 2012-12-20 | Sensing optical fiber ring and Sagnac type an all-optical fiber current transformer |
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| CN 201220711772 CN203011983U (en) | 2012-12-20 | 2012-12-20 | Sensing optical fiber ring and Sagnac type an all-optical fiber current transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048512A (en) * | 2012-12-20 | 2013-04-17 | 中国科学院西安光学精密机械研究所 | Sensing optical fiber ring and Sagnac type all-fiber current transformer |
| CN103558438A (en) * | 2013-11-22 | 2014-02-05 | 杭州含章科技有限公司 | System and method for reducing frequency of null drift of reflective optical fiber amperemeter |
| CN111044771A (en) * | 2019-12-31 | 2020-04-21 | 华中科技大学 | Non-closed optical fiber loop current sensing device and current measuring method |
-
2012
- 2012-12-20 CN CN 201220711772 patent/CN203011983U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048512A (en) * | 2012-12-20 | 2013-04-17 | 中国科学院西安光学精密机械研究所 | Sensing optical fiber ring and Sagnac type all-fiber current transformer |
| CN103048512B (en) * | 2012-12-20 | 2015-07-15 | 中国科学院西安光学精密机械研究所 | Sensing optical fiber ring and Sagnac type all-fiber current transformer |
| CN103558438A (en) * | 2013-11-22 | 2014-02-05 | 杭州含章科技有限公司 | System and method for reducing frequency of null drift of reflective optical fiber amperemeter |
| CN103558438B (en) * | 2013-11-22 | 2016-01-20 | 杭州含章科技有限公司 | A kind of system and method reducing the drift of reflection type optical fiber current meter |
| CN111044771A (en) * | 2019-12-31 | 2020-04-21 | 华中科技大学 | Non-closed optical fiber loop current sensing device and current measuring method |
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