CN103308745B - Optical fiber current sensing system - Google Patents
Optical fiber current sensing system Download PDFInfo
- Publication number
- CN103308745B CN103308745B CN201310217673.8A CN201310217673A CN103308745B CN 103308745 B CN103308745 B CN 103308745B CN 201310217673 A CN201310217673 A CN 201310217673A CN 103308745 B CN103308745 B CN 103308745B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- current sensing
- terminal
- fiber current
- light
- 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.)
- Expired - Fee Related
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 166
- 239000004020 conductor Substances 0.000 claims abstract description 41
- 230000010287 polarization Effects 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 23
- 230000004927 fusion Effects 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 88
- 230000001681 protective effect Effects 0.000 claims description 47
- 239000000463 material Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000314 lubricant Substances 0.000 claims description 7
- 239000010453 quartz Substances 0.000 claims description 6
- 230000001186 cumulative effect Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 14
- 238000005259 measurement Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention provides optical fiber current sensing system, comprise photodetector, signal processing unit and the light source be linked in sequence, y-shaped waveguide, 45 ° of fusion points, slab waveguide modulator, polarization maintaining optical fibre and optical fiber current sensing devices, wherein y-shaped waveguide has first point of terminal, second point of terminal and closes terminal, for changing the light beam received from light source by first point of terminal into linearly polarized light, and receive carrying after the light beam of conductor current information that optical fiber current sensing device returns export from closing terminal from second point of terminal; Intensity signal for detecting the light intensity of the interference light exported from second point of terminal of y-shaped waveguide, and is converted to electric signal and sends to described signal processing unit by photodetector.This optical fiber current sensing system have employed twi guide structure, and y-shaped waveguide can improve the polarization property of light path, and slab waveguide modulator can complete the modulation to light phase, and this light path has the advantage that structure is simple, light path polarization stability performance is high.
Description
The application is number of patent application is " 201010150176.7 ", and the applying date is " on 04 12nd, 2010 ", and denomination of invention is the divisional application of " optical fiber current sensing device and optical fiber current sensing system ".
Technical field
The present invention relates to fiber-optic current sensor technology, particularly a kind of optical fiber current sensing system.
Background technology
Current sensor or mutual inductor are the visual plants of current detecting in the fields such as metallurgy, chemical industry, electric power, and safety, the stable operation of its long-time stability, reliability, security and electric power system are closely related.
At present, the fibre optic current sensor based on Faraday effect reported is because its measurement range is large, precision is high and be used in current measurement.This fibre optic current sensor mainly utilizes Ampere circuit law and Faraday magnetooptical effect to measure the electric current of conductor.According to Ampere circuit law, closed magnetic field can be produced around alive conductor, and the two bundle polarized lights propagated in sensor fibre can produce phase differential under the influence of a magnetic field, utilize interference technique to detect this phase differential, just can obtain the size of current corresponding with magnetic field.
Sensor fibre in this fibre optic current sensor is pre-installed appropriately in closed annular metal structure.Sensor fibre is wound in the outer of metal structure or the archimedean spiral groove of side, after sensor fibre first coiling success, carries out fillings fix with silica gel, and to make the curvature of sensor fibre, placement path is fixed up.That is, this sensor fibre is fixed on closed ring texture body in advance, non-dismountable.When measuring the electric current of conductor, closed ring texture body being set on Ampereconductors, Ampereconductors can only being disconnected, after closed ring texture body is inserted in, then Ampereconductors be connected.But the high-current conductor diameter used at metallurgical, chemical field can reach more than 1m, can not disconnect easily.Can find out, existing this fibre optic current sensor, owing to can not carry out opening installation at the scene, is thus restricted in application that is metallurgical, chemical field.
Summary of the invention
The invention provides a kind of can the optical fiber current sensing device installed of on-the-spot opening.
One embodiment of the present of invention provide a kind of optical fiber current sensing device, for measuring the electric current by conductor.This optical fiber current sensing device comprises: sensor fibre, comprises optical fiber and is enclosed within the flexible protective casing outside this optical fiber; Support, comprise the Part I and Part II all with optical fiber duct, wherein, this Part I and this Part II removably connect into the closed hoop structure of enclosing around described conductor one, the optical fiber duct of described Part I and the optical fiber duct of described Part II are combined into closed hoop, for holding described sensor fibre.
The Part I of described support can be U-shaped structure, and this U-shaped structure is connected with two corner arms by three direct-connected arms all with optical fiber duct and is formed; That the Part II of described support can comprise connection, that all there is optical fiber duct two corner arms and a direct-connected arm; Each corner arm of described Part II is all connected with a direct-connected arm of described Part I, connects into described closed hoop structure to make described Part I and described Part II.
Preferably, described flexible protective casing comprises the sleeve pipe be made up of quartz material.
Preferably, described flexible protective puts has the first mark, described support has the second mark, and when described sensor fibre is placed in described optical fiber duct, described first mark and described second marks corresponding.
Preferably; described first is labeled as the boss being positioned at described flexible protective casing end; described second is labeled as the groove being positioned at described optical fiber duct; when described sensor fibre is placed in described optical fiber duct; described boss is placed in described groove, corresponding to make described first mark and described second mark.
Preferably, lubricant is filled between described optical fiber and described flexible protective casing.
Preferably, the girth of described sensor fibre equals the integral multiple of the girth of the optical fiber duct of described closed hoop.
Present invention also offers a kind of can the optical fiber current sensing system installed of on-the-spot opening.
One embodiment of the invention provides a kind of optical fiber current sensing system, for measuring the electric current by conductor.This optical fiber current sensing system comprises photodetector, signal processing unit and the light source be linked in sequence, y-shaped waveguide, 45 ° of fusion points, slab waveguide modulator, polarization maintaining optical fibre and optical fiber current sensing devices as previously discussed, and wherein said light source is for generation of light beam; Described y-shaped waveguide has first point of terminal, second point of terminal and closes terminal, for changing the light beam received from described light source by described first point of terminal into linearly polarized light, and receive from closing terminal the light beam carrying conductor current information that described optical fiber current sensing device returns; Described 45 ° of fusion points are used for a branch of linearly polarized light exported from described y-shaped waveguide being divided the two bunch polarized lights be orthogonal; Described slab waveguide modulator is used for modulating one of two bunch polarized lights wherein transmitted; Described polarization maintaining optical fibre is for transmitting two bundle polarized lights; Described optical fiber current sensing device is around described conductor, for obtaining the information with the electric current of flowing in described conductor, and the polarized light carrying described current information is back to described polarization maintaining optical fibre, and transfer to the conjunction terminal of described y-shaped waveguide through described slab waveguide modulator, described 45 ° of fusion points according to this; Intensity signal for detecting the light intensity of the interference light exported from one of point terminal of described y-shaped waveguide, and is converted to electric signal and sends to described signal processing unit by described photodetector; Described signal processing unit is connected to described slab waveguide modulator, modulates one of two bunch polarized lights transmitted in described slab waveguide modulator.
Preferably, the support of described optical fiber current sensing device is fixed on base, or be fixed on be positioned at the upper and lower both sides of described conductor crossbeam on.
Preferably, described optical fiber current sensing system comprises temperature sensor further, described temperature sensor is positioned on described support, for detecting the temperature at described optical fiber current sensing device place, and detected temperature information is sent to described signal processing unit.
According to optical fiber current sensing device and the optical fiber current sensing system of the embodiment of the present invention, the optical fiber in sensor fibre is protected by protective sleeve, can be wound on the support of on-the-spot opening installation, and disconnect without the need to Ampereconductors.Therefore, this optical fiber current sensing device and optical fiber current sensing system can be widely used in the fields such as metallurgy, chemical industry, electric power.
Because a part for the support according to the embodiment of the present invention is U-shaped structure, support is easily assembled, make optical fiber current sensing device field-mounted process simple and convenient.
According to embodiments of the invention, the flexible protective casing of sensor fibre is made up of quartz material, and such flexible protective casing and optical fiber have identical or close thermal expansivity, can prevent or alleviate flexible protective casing and produce stress to optical fiber.
Such as, by arranging mark, boss on the flexible protective cover of sensor fibre, mark is set on support, such as corresponding with boss groove simultaneously, can ensures all according to identical position angle, sensor fibre to be arranged in the optical fiber duct of support at every turn.Therefore, do not need to repeat to demarcate after once demarcating, and the accuracy of measurement can be ensured.
According to embodiments of the invention; lubricant is filled in the flexible protective casing of sensor fibre; can be easier to make optical fiber pierce in flexible protective casing; and penetrate after in flexible protective casing at optical fiber; lubricant is filled between optical fiber and flexible protective casing; can also buffering flexible protective sleeve stress that optical fiber is produced, thus ensure the stable performance of optical fiber.
According to embodiments of the invention, sensor fibre encloses or multi-turn around Ampereconductors one, utilizes Ampere circuit law, makes magneto-optic effect carry out integration along closed circuit, thus stray current can be avoided to have an impact to measurement result.
According to embodiments of the invention, optical fiber current sensing system have employed twi guide structure, and y-shaped waveguide can improve the polarization property of light path, and slab waveguide can complete the modulation to light phase.This light path has the advantage that structure is simple, light path polarization stability performance is high.
According to embodiments of the invention, by temperature sensor being placed in the optional position of support, be used for detecting the temperature at sensing device place, and send temperature information to signal processing unit, temperature compensation mechanism can be introduced optical fiber current sensing system, for compensating the error that sensor fibre causes because of temperature variation, thus the accuracy of measurement can be improved.
According to embodiments of the invention, optical fiber current sensing device can be fixed on base or crossbeam, remains unchanged to make the relative position of optical fiber current sensing device and Ampereconductors.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of optical fiber current sensing device according to an embodiment of the invention.
Fig. 2 A to Fig. 2 D is the structural representation of the sensor fibre of optical fiber current sensing device according to the embodiment of the present invention, and wherein Fig. 2 A illustrates the overall schematic of sensor fibre; Fig. 2 B illustrates the cut-open view of a part for sensor fibre; Fig. 2 C illustrates the structure of the catoptron end of sensor fibre; And Fig. 2 D is the cut-open view along the line I-I ' in Fig. 2 C.
Fig. 3 is the general illustration of the support of optical fiber current sensing device according to the embodiment of the present invention.
Fig. 4 is the schematic diagram of the direct-connected arm of support shown in Fig. 3.
Fig. 5 is the schematic diagram of the corner arm of support shown in Fig. 3.
Fig. 6 is the schematic diagram that sensor fibre is limited in the direct-connected arm of support shown in Fig. 3.
Fig. 7 is the schematic diagram of the optical fiber current sensing system according to the embodiment of the present invention.
Fig. 8 is the schematic diagram of optical fiber current sensing system according to another embodiment of the present invention.
Fig. 9 is that optical fiber current sensing device is fixed on the schematic diagram on base according to an embodiment of the invention.
Figure 10 is that optical fiber current sensing device is fixed on the schematic diagram on crossbeam according to another embodiment of the present invention.
Embodiment
Below with reference to accompanying drawing embodiment of the present invention will be described in more detail.In accompanying drawing, identical Reference numeral represents identical element all the time.
In order to make sensor fibre to install by on-the-spot opening, one embodiment of the invention provide a kind of optical fiber current sensing device for measuring the electric current by conductor.As shown in Figure 1, this optical fiber current sensing device comprises sensor fibre 6 and the support 10 for installing this sensor fibre.Sensor fibre 6 comprises optical fiber and is enclosed within the flexible protective casing outside this optical fiber.Support 10 comprises the Part I and Part II all with optical fiber duct.Part I and Part II removably connect into the closed hoop structure of enclosing around measured conductor one, and the optical fiber duct of the optical fiber duct of Part I and Part II forms closed hoop, for holding sensor fibre 6.
In the present embodiment, on the one hand optical fiber has flexible protective casing to protect, and flexible protective casing can the stress that is subject to of buffered optical fibers, makes sensor fibre can by repeatedly coiling.On the other hand, support comprises the two parts removably connected, and first Part I can be placed on the side of measured conductor at the scene, make it partly around measured conductor, again the opposite side of Part II from measured conductor is connected with Part I, thus forms closed hoop.After at the scene support installing is good, sensor fibre just can be wound in the optical fiber duct on support.In this way, sensor fibre just can be installed by on-the-spot opening or coiling with around measured conductor, and do not need measured conductor to disconnect.
Fig. 2 A to Fig. 2 D is the structural representation of the sensor fibre of optical fiber current sensing device according to an embodiment of the invention, and wherein Fig. 2 A illustrates the overall schematic of sensor fibre; Fig. 2 B illustrates the cut-open view of a part for sensor fibre; Fig. 2 C illustrates the structure of the catoptron end of sensor fibre; And Fig. 2 D is the cut-open view along the line I-I ' in Fig. 2 C.
As shown in Figure 2 A and 2 B, sensor fibre 6 comprises optical fiber 60 and flexible protective casing 63, and optical fiber 60 is through flexible protective casing 63.The two ends of optical fiber 60 comprise quarter wave plate 61 and catoptron 62 respectively.For example, optical fiber 60 can be low birefringent fiber.Quarter wave plate 61 and catoptron 62 all can be integrally formed with optical fiber 60, such as, all can be formed on optical fiber 60.Flexible protective casing 63 is for the protection of the quarter wave plate 61 at whole section of optical fiber 60 and optical fiber 60 two ends and catoptron 62.
Flexible protective casing 63 has two ends, comprises first end corresponding with catoptron 62, and second end corresponding with quarter wave plate 61.As shown in Figure 2 C and 2 D shown in FIG., the first end of flexible protective casing 63 is airtight, and has a boss 65.Boss 65 can regard the one mark that flexible protective puts as.Such as, boss 65 can correspond to quick shaft direction or the slow-axis direction of optical fiber.Although do not illustrate in figure, be appreciated that boss 65 also can be arranged on the second end of flexible protective casing 63.Boss 65 can also be arranged on any position in flexible protective casing 63.Flexible protective casing 63 second end corresponding with quarter wave plate 61 also can be airtight, but allows optical fiber 60 to pass.
Flexible protective casing 63 by nonmetallic materials, as quartz, nylon etc. are made, preferably can have the material of identical or close thermal expansivity with optical fiber.Because optical fiber itself adopts quartz material, therefore, if flexible protective casing 63 also adopts quartz material, then the thermal expansivity of the two is equal or close, is so just not easy to produce stress to optical fiber itself, thus can ensure the stable of optical fiber property.
Flexible protective casing 63 can comprise the sleeve pipe be made up of above-mentioned material.Can also be wrapped up by the material such as plastics, silica gel outside sleeve pipe.For example, according to the size of optical fiber, the internal diameter of sleeve pipe can be designed as 400-700 μm, and external diameter can be designed as 1000-1200 μm.
According to embodiments of the invention, can fill in flexible protective casing 63 with lubricant 64, more easily pierce in flexible protective casing 63 to make optical fiber 60.After optical fiber 60 penetrates flexible protective casing 63, lubricant 64 plays buffer action between optical fiber 60 and flexible protective casing 63, better can ensure the stable of optical fiber property.Lubricant 64 can be silicone oil material.
Flexible protective casing 63 can bend, sensor fibre scene can be wound on around measured conductor.Such as, the radius-of-curvature of sensor fibre 6 coiling is greater than 0.5m usually, not produce excessive optical fiber residual birefringence.This sensor fibre 6 described herein is installed for on-the-spot opening.
Fig. 3 to Fig. 6 shows the schematic diagram of support according to an embodiment of the invention.Wherein, Fig. 3 is the general illustration of the support of optical fiber current sensing device according to the embodiment of the present invention; Fig. 4 is the schematic diagram of the direct-connected arm of support shown in Fig. 3; Fig. 5 is the schematic diagram of the corner arm of support shown in Fig. 3; Fig. 6 is the schematic diagram that sensor fibre is limited in the direct-connected arm of support shown in Fig. 3.
As shown in Figure 3, support 10 is combined by direct-connected arm 101 and corner arm 102.Direct-connected arm 101 and corner arm 102 are undertaken being connected spacing by tongue and groove, as shown in Figure 4 and Figure 5.But the present invention is not limited to embodiment given here, in fact, direct-connected arm 101 can be connected by any connected mode well known in the prior art with corner arm 102.
Direct-connected arm 101 and corner arm 102 all has the optical fiber duct 110 for holding sensor fibre 6, as shown in Figure 4 and Figure 5.After direct-connected arm 101 and corner arm 102 are installed into annular support as shown in Figure 3, sensor fibre 6 can be wound in the optical fiber duct 110 of this annular support, and forms ring texture.
Direct-connected arm 101 and two corner arms 102 can be pre-assembled into the support of a U-shaped structure.During in-site installation, can first by U-shaped holder part around measured conductor, respectively two corner arms 102 are connected with the two ends of U-shaped support again, finally direct-connected arm 101 are connected with two corner arms 102, a final formation closed hoop support 10 around measured conductor.This supporting structure is simple, is convenient to in-site installation, under normal conditions, only need the time of 2 hours just can in-site installation complete.
One of direct-connected arm 101 can comprise groove 120 further at its optical fiber duct 110, as shown in Figure 6.The size of groove 120 and the flexible protective casing 63 of sensor fibre 6 at the dimensional fits of the boss 65 of catoptron end, to hold boss 65 wherein.Although illustrate that optical fiber duct 110 is recessed and formed from the external annular surface of support here, it will be understood by those skilled in the art that optical fiber duct 110 also can from the side surface of support or inner ring surface recessed and formed.Although illustrate that groove 120 is recessed and formed from the bottom surface of optical fiber duct 110 here, be appreciated that groove 120 also can be recessed and formed from the side of optical fiber duct 110.
The benefit using direct-connected arm 101 and corner arm 102 to be combined into support is, can be formed the mounting bracket of different-diameter by the direct-connected arm 101 changing different length.Such as, the direct-connected arm 101 with different length can be selected according to the diameter of on-the-spot measured conductor.
The support of said structure is only example, and is not used in restriction scope of the present invention.For example, U-shaped support can be integrally formed.Again for example, the U-shaped support that above-mentioned annular closed support can be integrally formed respectively by two is connected to form, as shown in Figure 1.
In actual applications, need the direct-connected arm 101 selecting appropriate length according to the diameter of measured conductor or girth, thus make the girth of the last support 10 formed be greater than the girth of measured conductor.The length of sensor fibre 6 can equal the optical fiber duct 110 of support 10 girth (situation that coiling one is enclosed) or equal support 10 optical fiber duct 110 girth N doubly (situation that coiling N encloses), here, N is integer.Like this, sensor fibre 6 encloses along optical fiber duct 110 coiling one or after multi-turn, quarter wave plate 61 can overlap in position with catoptron 62, to form closed circuit.According to Ampere circuit law, such coiling sensor fibre can make magneto-optic effect carry out integration along closed circuit, thus stray current can be avoided to have an impact to measurement result.
Time in each optical fiber duct 110 sensor fibre 6 is placed in support 10; first the boss 65 of the first end of flexible protective casing 63 is put into the groove 120 of the optical fiber duct 110 of direct-connected arm, the tangential direction of sensor fibre 6 along support is placed in the optical fiber duct 110 of support piecemeal.Then, sensor fibre is drawn from direct-connected arm, as shown in Figure 6.In this way, can at every turn all with identical position angle coiling sensor fibre 6.Such as, all can ensure that the quick shaft direction (or slow-axis direction) of quarter wave plate is parallel with the plane of support 10 at every turn.Certainly, the quick shaft direction of quarter wave plate (or slow-axis direction) also can be made angled with the plane of support 10, as long as each angle is all identical.The residual birefringence of the sensor fibre of repeatedly coiling can be made so consistent, therefore, only need once to demarcate sensor fibre, and demarcate without the need to repeating, just can ensure the accuracy measured.
The mode that the position angle of each coiling of above-mentioned guarantee is identical is only example of the present invention, is not intended to limit the present invention.Such as, boss also can be arranged on the second end of flexible protective casing, and groove also can be arranged in the optical fiber duct of corner arm.When mounted, first boss is put into groove, and then the tangential direction of sensor fibre along support periphery is pressed in optical fiber duct piecemeal.Again such as, also groove can be set on flexible protective cover, and boss is set on direct-connected arm or corner arm.More generally, the first mark can be set on the flexible protective cover of sensor fibre, the second mark be set on support simultaneously, all mark corresponding mode with the first mark and second at every turn and sensor fibre is placed in optical fiber duct.
Although according to above description, sensor fibre 6 is drawn by from direct-connected arm 101, and sensor fibre 6 also can be drawn from corner arm 102.In other words, two ends of sensor fibre 6, namely the catoptron 62 of optical fiber 60 and quarter wave plate 61, both can overlap, also can overlap in corner arm 102 in direct-connected arm 101.
According to one embodiment of present invention, support 10 also comprises protective cover, and this protective cover for covering the optical fiber duct 110 accommodating sensor fibre 6, thus protects the sensor fibre 6 be placed in optical fiber duct 110.Such as, each direct-connected arm 101 and each corner arm 102 are all furnished with a protective cover, the catoptron 62 of optical fiber 60 to overlap with quarter wave plate 61 residing direct-connected arm 101 or corner arm 102 protective cover on need that there is an opening, to allow sensor fibre to draw from opening, such as shown in Figure 6.
It will be understood by those skilled in the art that support 10 can by nonmagnetic substance, such as aluminium, plastics, polyester material etc. are made.
Below describing utilizes the optical fiber current sensing device of the above embodiment of the present invention to the example of the optical fiber current sensing system that electric current is measured.
Fig. 7 is the schematic diagram of optical fiber current sensing system according to an embodiment of the invention.As shown in Figure 1, optical fiber current sensing system comprises light source 1, y-shaped waveguide 2,45 ° of fusion points 3, slab waveguide modulator 4, polarization maintaining optical fibre lag line 5, the optical fiber current sensing device comprising sensor fibre 6 as above, photodetector 7, signal processing units 8.
Light source 1 is laser instrument, sends light beam.
Y-shaped waveguide 2 comprises two points of terminals and one and closes terminal, is connected to light source 1 one of in two points of terminals, for from light source 1 receiving beam, makes light beam generation polarization, and from the conjunction terminal polarization light output of y-shaped waveguide 2.Y-shaped waveguide 2 by closing the light beam carrying tested current information that terminal reception sensor fibre 6 returns, and can also export from point terminal.
45 ° of fusion points are connected to the conjunction terminal of y-shaped waveguide, and the polarized light for the conjunction terminal from y-shaped waveguide 2 being exported is decomposed into two mutually orthogonal bunch polarized lights of polarization direction.
Slab waveguide modulator 4 is broken down into two mutually orthogonal bunch polarized lights of polarization direction for receiving, and modulates wherein a branch of linearly polarized light under the control of signal processing unit 8.
One end that one end of polarization maintaining optical fibre lag line 5 and slab waveguide modulate 4 is connected by shaft, and the other end is connected to the sensor fibre 6 of optical fiber current sensing device.
Although not shown in figure, sensor fibre 6 is wound on support 10 as above, and around measured conductor.The quarter wave plate 61 of optical fiber 60 is connected to polarization maintaining optical fibre lag line 5, receive two bunch polarisations from polarization maintaining optical fibre lag line 5 and this two bunch polarized light be converted to the two bundle elliptically polarized lights distinguishing left-handed and dextrorotation, two bundle elliptically polarized lights produce phase differential under the effect in the magnetic field that measured conductor produces, after being reflected by catoptron 62, export from quarter wave plate 61 and carry current information, yawing moment there occurs two bunch polarized lights of reversion, and along polarization maintaining optical fibre lag line 5, slab waveguide modulator 4, 45 ° of fusion points 3 enter the conjunction terminal of y-shaped waveguide, finally export from point terminal of y-shaped waveguide.Here, sensor fibre 6 has the structure described in above composition graphs 2A to Fig. 2 D, is not described in detail here.
The light intensity signal detected, for detecting the light sent from one of point terminal of y-shaped waveguide modulator 2, is converted to electric signal and exports by photodetector 7.
The electric signal carrying intensity signal that signal processing unit 8 exports for receiving photodetector 7, and electric signal is processed to the electric current obtaining measured conductor.Signal processing unit 8 also produces the square-wave modulation signal of light path eigenfrequency and the cumulative sum of negative feedback step signal, cumulative sum is delivered to slab waveguide modulator 4, thus the control realized one of the two bunch polarized lights transmitted in slab waveguide modulator 4, here be the digital newspaper industry of phase place zero setting, finally the slope of staircase waveform sent with data mode as measured DC data.
Present description uses the principle that shown in Fig. 7, optical fiber current sensing system is measured electric current.When measuring the electric current of conductor, need sensor fibre 6 to enclose or multi-turn around measured conductor one.In other words, need to make tested Ampereconductors through in the closed hoop be coiled into by sensor fibre 6.
The light that light source 1 sends enters y-shaped waveguide 2, starting of oscillation in y-shaped waveguide 2, produces linearly polarized light.Linearly polarized light, through 45 ° of fusion points 3, is divided into two orthogonal bunch polarized lights.Two bunch polarized lights enter slab waveguide modulator 4, and wherein, by the control of signal processing unit, one of two bunch polarized lights are modulated.Two bunch polarized lights enter polarization maintaining optical fibre lag line 5, enter sensor fibre 6 respectively wherein along X-axis (fast axle) and Y-axis (slow axis) transmission.After the quarter wave plate 61 of sensor fibre 6, the orthogonal two bunch polarized lights of direction of vibration become two bundle elliptically polarized lights (its special shape is circularly polarized light), and wherein a branch of left-handed, another restraints dextrorotation.
The two bundle elliptically polarized lights propagated in sensor fibre 6 produce phase differential under Faraday effect and tested electric current acting in conjunction, and this phase differential represents with following formula:
Wherein, a is the parameter relevant with polarization, represents circularly polarized light proportion, a=0 during linear polarization, a=± 1 during circular polarization, 0<|a|<1 during elliptic polarization; N is the number of turn of sensor fibre, when sensor fibre encloses layout around tested Ampereconductors one, and N=1; V is Verdet constant; I is the electric current that sensor fibre surrounds.
Two bundle polarized lights are reflected by catoptron when arriving the end of sensor fibre, return sensor fibre 6.After reflection, former left-handed rotation becomes right-handed rotation, and former right-handed rotation becomes left-handed rotation.Under the acting in conjunction of Faraday magnetooptical effect and tested electric current, again create
phase differential.Like this, through once come and go after, from sensor fibre 6 out two bundle polarized lights create
phase differential.This phase differential is corresponding with tested electric current, and the two bundle elliptically polarized lights namely returned from sensor fibre carry current information.The two bundle elliptically polarized lights returned change linearly polarized light into after the quarter wave plate of sensor fibre, and enter polarization maintaining optical fibre lag line 5, the light of former X-axis enters Y-axis, and the light of former Y-axis enters X-axis, propagates along polarization maintaining optical fibre lag line 5.Again after slab waveguide modulator 4, get back to y-shaped waveguide 2, interfere in y-shaped waveguide 2, and export from point terminal of y-shaped waveguide 2.The intensity of the interference light exported is detected by photodetector 7.The light intensity signal detected is converted to electric signal by photodetector 7, and electric signal is sent to signal processing unit 8.Signal processing unit 8 determines the electric current of measured conductor from the electric signal received.
According to the present embodiment, optical fiber current sensing system have employed twi guide structure, and y-shaped waveguide 2 can improve the polarization property of light path, and slab waveguide modulator 4 can complete the modulation to light phase.This light path has the advantage that structure is simple, light path polarization stability performance is high.
Fig. 8 shows the schematic diagram of optical fiber current sensing system according to another embodiment of the present invention.With optical fiber current sensing system shown in Fig. 7 unlike, optical fiber current sensing system shown in Fig. 8 also comprises temperature sensor 9.In Fig. 8, other element is identical with the respective element of Fig. 7, is not described in detail at this.
Temperature sensor 9 can be placed on the support 10 of optical fiber current sensing device 6, for the temperature of the position of detection optical fiber current sensor device, and sends temperature information to signal processing unit 8.This temperature information when controlling slab waveguide modulator 4, can take into account by signal processing unit 8, thus temperature compensation mechanism is incorporated in measurement result.
According to the present embodiment, by temperature sensor is positioned on support, be used for detecting the temperature at sensing device place, and send temperature information to signal processing unit, temperature compensation mechanism can be introduced optical fiber sensing system, for compensating the error that sensor fibre causes because of temperature variation, thus the accuracy of measurement can be improved.
At the scene in practical application, can also be fixed support 10.According to one embodiment of present invention, support can be fixed by base 20, as shown in Figure 9.Base is mounted in advance according to test position at the scene, and support 10 can be fixed on base 20 by coupling bolt or jig.
According to another embodiment of the present invention, support can be fixed on two nonmetal crossbeams 30 of measured conductor upper and lower both sides placement, as shown in Figure 10.Crossbeam two ends are connected with corner arm 102 respectively by two jigs 31.During in-site installation, first jig 32 can be installed on four corner arms 102, and then be connected with the crossbeam 30 of the upper and lower both sides of measured conductor, final realization fixing support 10.The concrete structure of jig is not emphasis of the present invention, and the jig that can realize above-mentioned functions in prior art all can use.
Above fixed form is only example, the scope be not intended to limit the present invention.Support can be fixed in any known fashion.
The foregoing is only preferred embodiment of the present invention, be not limited to the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. an optical fiber current sensing system, for measuring the electric current by conductor, it is characterized in that, this optical fiber current sensing system comprises photodetector, signal processing unit and the light source be linked in sequence, y-shaped waveguide, 45 ° of fusion points, slab waveguide modulator, polarization maintaining optical fibre and optical fiber current sensing devices, and wherein said light source is for generation of light beam; Described y-shaped waveguide has first point of terminal, second point of terminal and closes terminal, for changing the light beam received from described light source by described first point of terminal into linearly polarized light, and from close that terminal receives that described optical fiber current sensing device returns carry the light beam of conductor current information after export from second point of terminal; Described 45 ° of fusion points are used for a branch of linearly polarized light exported from described y-shaped waveguide being divided the two bunch polarized lights be orthogonal; Described slab waveguide modulator is used for modulating one of two bunch polarized lights wherein transmitted; Described polarization maintaining optical fibre is for transmitting two bundle polarized lights; Described optical fiber current sensing device is around described conductor, for obtaining the information of the electric current in described conductor, and the polarized light carrying described current information is back to described polarization maintaining optical fibre, and transfer to the conjunction terminal of described y-shaped waveguide through described slab waveguide modulator, described 45 ° of fusion points according to this; Intensity signal for detecting the light intensity of the interference light exported from second point of terminal of described y-shaped waveguide, and is converted to electric signal and sends to described signal processing unit by described photodetector; Described signal processing unit is connected to described slab waveguide modulator, modulates one of two bunch polarized lights transmitted in described slab waveguide modulator.
2. optical fiber current sensing system according to claim 1, is characterized in that, comprises temperature sensor further, for detecting the temperature at described optical fiber current sensing device place, and detected temperature information is sent to described signal processing unit.
3. optical fiber current sensing system according to claim 1, is characterized in that, described signal processing unit receives the electric signal carrying intensity signal that photodetector exports, and electric signal is processed to the electric current obtaining measured conductor.
4. optical fiber current sensing system according to claim 3, it is characterized in that, described signal processing unit also produces the square-wave modulation signal of light path eigenfrequency and the cumulative sum of negative feedback step signal, cumulative sum is delivered to slab waveguide modulator, thus the digital newspaper industry realized the phase place zero setting of one of the two bunch polarized lights transmitted in slab waveguide modulator, finally the slope of staircase waveform is sent as measured DC data with data mode.
5. according to the optical fiber current sensing system one of Claims 1-4 Suo Shu, it is characterized in that, described optical fiber current sensing device is can the optical fiber current sensing device installed of on-the-spot opening, and for measuring the electric current by conductor, this optical fiber current sensing device comprises:
Sensor fibre, comprises optical fiber and is enclosed within the flexible protective casing outside this optical fiber; Described flexible protective casing comprises the sleeve pipe be made up of quartz material; Lubricant is filled between described optical fiber and described flexible protective casing;
Support, comprise the Part I and Part II all with optical fiber duct, wherein, this Part I and this Part II removably connect into the closed hoop structure of enclosing around described conductor one, the optical fiber duct of described Part I and the optical fiber duct of described Part II are combined into closed hoop, for holding described sensor fibre.
6. optical fiber current sensing system according to claim 5, is characterized in that, the Part I of described support is U-shaped structure, and this U-shaped structure is connected with two corner arms by three direct-connected arms all with optical fiber duct and is formed;
That the Part II of described support comprises connection, that all there is optical fiber duct two corner arms and a direct-connected arm;
Wherein, each corner arm of described Part II is all connected with a direct-connected arm of described Part I, connects into described closed hoop structure to make described Part I and described Part II.
7. optical fiber current sensing system according to claim 5, is characterized in that, the girth of described sensor fibre equals the integral multiple of the girth of the optical fiber duct of described closed hoop.
8. optical fiber current sensing system according to claim 5, is characterized in that, the support of described optical fiber current sensing device is fixed on base, or be fixed on be positioned at the upper and lower both sides of described conductor crossbeam on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310217673.8A CN103308745B (en) | 2010-04-12 | 2010-04-12 | Optical fiber current sensing system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310217673.8A CN103308745B (en) | 2010-04-12 | 2010-04-12 | Optical fiber current sensing system |
| CN201010150176.7A CN102213729B (en) | 2010-04-12 | 2010-04-12 | Optical fiber current sensing device and optical fiber current sensing system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010150176.7A Division CN102213729B (en) | 2010-04-12 | 2010-04-12 | Optical fiber current sensing device and optical fiber current sensing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103308745A CN103308745A (en) | 2013-09-18 |
| CN103308745B true CN103308745B (en) | 2016-01-27 |
Family
ID=44745123
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010150176.7A Expired - Fee Related CN102213729B (en) | 2010-04-12 | 2010-04-12 | Optical fiber current sensing device and optical fiber current sensing system |
| CN201410029528.1A Expired - Fee Related CN103743936B (en) | 2010-04-12 | 2010-04-12 | Optical fiber current sensing device and optical fiber current sensing system |
| CN201310217673.8A Expired - Fee Related CN103308745B (en) | 2010-04-12 | 2010-04-12 | Optical fiber current sensing system |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010150176.7A Expired - Fee Related CN102213729B (en) | 2010-04-12 | 2010-04-12 | Optical fiber current sensing device and optical fiber current sensing system |
| CN201410029528.1A Expired - Fee Related CN103743936B (en) | 2010-04-12 | 2010-04-12 | Optical fiber current sensing device and optical fiber current sensing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN102213729B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967740B (en) * | 2012-11-29 | 2015-04-29 | 易能（中国）电力科技有限公司 | All-fiber current transformer and current measuring method |
| CN103063898B (en) * | 2012-12-20 | 2015-11-18 | 中国科学院西安光学精密机械研究所 | A kind of sensing fiber ring and all-fiber current transformator |
| 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 |
| CN103969501B (en) * | 2014-05-15 | 2016-10-05 | 北京航佳科技有限公司 | A kind of optical current sensor |
| CN105319425B (en) * | 2014-07-09 | 2018-06-26 | 北京自动化控制设备研究所 | A kind of packaging method of full-fiber quarter wave plate |
| CN104122427B (en) * | 2014-08-04 | 2017-01-25 | 山东理工大学 | Analogue electric signal transmission method applied to current transformer |
| US9405074B1 (en) * | 2015-07-13 | 2016-08-02 | General Electric Company | Optical current transducer alignment |
| CN106546793A (en) * | 2016-11-01 | 2017-03-29 | 长园深瑞继保自动化有限公司 | Three-phase integratedization all-fiber current transformator |
| JP7058548B2 (en) * | 2018-05-09 | 2022-04-22 | 日置電機株式会社 | Current sensor and measuring device |
| CN111024769B (en) * | 2019-12-17 | 2020-11-24 | 中国矿业大学 | Coal mine advanced detection method for heading machine |
| CN117347701B (en) * | 2023-12-05 | 2024-04-12 | 北京世维通光智能科技有限公司 | Optical fiber current detection device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5729005A (en) * | 1996-07-12 | 1998-03-17 | Minnesota Mining And Manufacturing Company | Fiber optic current sensor with bend birefringence compensation |
| US6211982B1 (en) * | 1998-07-29 | 2001-04-03 | Litton Systems, Inc. | Remote sensor with waveguide optics telemetry |
| DE10000306B4 (en) * | 2000-01-05 | 2012-05-24 | Abb Research Ltd. | Fiber optic current sensor |
| JP3720327B2 (en) * | 2002-12-27 | 2005-11-24 | Ｎｅｃトーキン株式会社 | 3-axis optical electric field sensor |
| CN1687794A (en) * | 2005-06-13 | 2005-10-26 | 北京航空航天大学 | Optical fibre current transformer and its on line temp measuring method |
| CN201096818Y (en) * | 2007-11-15 | 2008-08-06 | 上海康阔光通信技术有限公司 | Sensing optical fiber ring |
| CN101216508B (en) * | 2008-01-18 | 2011-05-04 | 北京航空航天大学 | Optical fibre electric current sensor all-optical fibre sensing head |
| CN101303373B (en) * | 2008-07-10 | 2010-04-14 | 北京航天时代光电科技有限公司 | Method for manufacturing optical fiber current sensor sensitivity coil |
| 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 |
-
2010
- 2010-04-12 CN CN201010150176.7A patent/CN102213729B/en not_active Expired - Fee Related
- 2010-04-12 CN CN201410029528.1A patent/CN103743936B/en not_active Expired - Fee Related
- 2010-04-12 CN CN201310217673.8A patent/CN103308745B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102213729A (en) | 2011-10-12 |
| CN102213729B (en) | 2014-03-05 |
| CN103743936A (en) | 2014-04-23 |
| CN103743936B (en) | 2016-04-27 |
| CN103308745A (en) | 2013-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103308745B (en) | Optical fiber current sensing system | |
| US8624579B2 (en) | Fiber optic current sensor | |
| AU2009356476C1 (en) | Fiber-optic current sensing using a sensor with exchangeable sub-modules | |
| US5953121A (en) | Magneto-optic current sensor having a mechanically stress-free λ/4 element | |
| CN101427142B (en) | Fiber-optic current sensor with polarimetric detection scheme | |
| KR100248128B1 (en) | Optical current transformer | |
| CN100575958C (en) | Fibre Optical Sensor head and manufacture method thereof and the sensor that comprises this sensor head | |
| CN101226210A (en) | Reflection type polarization irrespective miniaturization photo-electricity mutual-inductor | |
| CN109709372A (en) | A kind of subway/coal mine stray electrical current fibre optical sensor closed-loop control device and method | |
| JPH07503318A (en) | current measurement | |
| CN102472785B (en) | Probe for electric/magnetic field | |
| CN102062800A (en) | Temperature compensated fiber optic current or magnetic field sensor with insensitivity to variations in sensor parameters | |
| CN103616651B (en) | A kind of fibre optic current sensor on-site calibration device and using method thereof | |
| Bohnert et al. | Fiber-optic dc current sensor for the electro-winning industry | |
| CN109696577A (en) | A kind of fibre optic current sensor and its measurement method of integrated temperature monitoring | |
| RU2321000C2 (en) | Fiber-optic current transformer | |
| CN207992311U (en) | A kind of solenoid type optics small electric current sensor with temperature-compensating | |
| Zhao et al. | All-fiber high-voltage capacitor unbalanced current transformer | |
| JPH11352158A (en) | Optical fiber measuring instrument | |
| CN207752068U (en) | The sensor of electrical power is measured using light carrier | |
| JP2000111586A (en) | Current-measuring device | |
| JP4467842B2 (en) | Optical applied measuring equipment | |
| Dey et al. | Simplified high-current measurement probe based on a single-mode optical fiber | |
| Nascimento | Optical fiber sensors technology for supervision, control and protection of high power systems | |
| CN117368810A (en) | Optical fiber magnetic field sensor based on special optical fiber, system and application |
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 | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200908 Address after: 432700 No.1, Guangshui Economic Development Zone, Suizhou City, Hubei Province Patentee after: HUBEI XUNDI SCIENCE & TECHNOLOGY Co.,Ltd. Address before: 255400 Shandong Province, Zibo city Linzi District North Road was was living area 32 Building 3 unit 401 Patentee before: Guo Jiaxin |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160127 Termination date: 20210412 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |