CN101968507A - Optical fiber voltage sensor and adjustment method thereof - Google Patents
Optical fiber voltage sensor and adjustment method thereof Download PDFInfo
- Publication number
- CN101968507A CN101968507A CN 201010285668 CN201010285668A CN101968507A CN 101968507 A CN101968507 A CN 101968507A CN 201010285668 CN201010285668 CN 201010285668 CN 201010285668 A CN201010285668 A CN 201010285668A CN 101968507 A CN101968507 A CN 101968507A
- Authority
- CN
- China
- Prior art keywords
- polarization
- polarization controller
- light
- electro
- voltage sensor
- 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.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000010287 polarization Effects 0.000 claims abstract description 236
- 239000013078 crystal Substances 0.000 claims abstract description 73
- 239000000523 sample Substances 0.000 claims abstract description 46
- 230000005684 electric field Effects 0.000 claims abstract description 26
- 230000000694 effects Effects 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 17
- 239000000835 fiber Substances 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 claims description 15
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 abstract description 15
- 238000001514 detection method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000008676 import Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005697 Pockels effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses an optical fiber voltage sensor and an adjustment method thereof. The optical fiber voltage sensor comprises a laser, a light probe, a first polarization controller, a second polarization controller, a rapid polarization state detector and an electrical high-pass filter, wherein the laser is used for transmitting input light to the light probe through the first polarization controller; the light probe is used for sensing the change of a voltage electrical field to be measured and transmitting output light obtained after processing the input light to the rapid polarization state detector through the second polarization controller according to the sensed change; the rapid polarization state detector is used for converting the polarization state change of the output light caused by the change of the electrical field to be measured into an electrical signal and sending the electrical signal to the electrical high-pass filter; and the high-pass filter is used for filtering polarization state change caused by environment. The change of polarization state on the equator of a Poincare sphere is directly detected by using the principal state principle, the natural birefrigent effect of crystal is effectively avoided, and the problem of temperature stability is effectively solved.
Description
Technical field
The present invention relates to the photoelectron technology field, relate in particular to a kind of optical fibre voltage sensor and control method thereof.
Background technology
In high voltage, big electric current and superpower electric system, traditional electromagnetic potential sensor exist be subject to that electromagnetic interference (EMI), precision are low, a series of shortcomings such as iron core resonance and lag-effect, be difficult to satisfy request for utilization.Advantages such as anti-electromagnetic interference capability is strong because Fibre Optical Sensor has, good insulating, dynamic range are big are so Fibre Optical Sensor is widely used in the high-tension electricity monitoring system.
An existing type optical fiber voltage sensor is a functional Fibre-Optic Sensors, optical fiber is promptly as the sensing element of sense voltage, again as the transmission line of transmitting optical signal, belong to the oval dual mode optical fiber voltage sensor of having of this class sensor, its ultimate principle is to utilize the elasto-optical effect of quartz crystal, shortcoming is that response speed is low, and the transient process of response voltage is restricted the scope of application fast; Another kind of is the mode transmission Fibre Optical Sensor, and the effect of optical fiber only is the transmission of finishing signal, and voltage is to be finished by other elements for the modulation of light signal, such as BGO crystal, lithium niobate modulator etc.
With reference to figure 1, Fig. 1 is the optical fibre voltage sensor structural representation of a kind of BGO of utilization crystal in the prior art, and its principle of work is:
The continuous light that laser instrument 1 sends is delivered to GRIN Lens 2 through incident optical and is collimated, and becomes a branch of spatial light.This bundle spatial light becomes linearly polarized light through the polarizer 3, becomes circularly polarized light through a λ/4 wave plates 4 then.The circularly polarized light of λ/4 wave plates, 4 outputs enters the BGO crystal 5, and at this moment its polarization direction will rotate (Pockels effect) under effect of electric field.Adopt the angle of 6 pairs of polarizations rotations of analyzer to detect at the exit end of BGO crystal, and then spatial light is focused in the optical fiber with a GRIN Lens 7.7 part has constituted the light probe part of whole sensor from GRIN Lens 2 to GRIN Lens, has only this light probe to place in the high-voltage electric field.Be sent to photodetector 8 from the light of light probe output by optical fiber and be converted to electric signal, finished the detection of tested voltage.Because electric field is proportional to extraneous voltage, detect this electric field and also just can converse voltage, thereby it can be used as a kind of voltage sensor.
Because the spatial beam that forms in the sensor shown in Fig. 1 will experience a plurality of optical elements such as the polarizer, λ/4 wave plates, BGO crystal, analyzer, adjust very difficulty between two GRIN Lens.In order to reduce the difficulty of adjustment, optical fiber adopts multimode optical fiber usually, and GRIN Lens often adopts the GRIN Lens of multimode optical fiber, and this will influence accuracy of detection.And have remaining natural birefringence owing to the BGO crystal is not ideal enough, the polarization principal axis of crystal is subjected to Temperature Influence, and the polarization direction of the polarizer and analyzer can not change thereupon, thereby causes serious temperature error.
Summary of the invention
The object of the present invention is to provide a kind of optical fibre voltage sensor and control method thereof.
On the one hand, the invention discloses a kind of optical fibre voltage sensor, comprise the Hi-pass filter of laser instrument, first Polarization Controller, light probe, second Polarization Controller, quick polarization attitude detecting device and electricity that order is provided with.
Above-mentioned optical fibre voltage sensor, preferred described first Polarization Controller is arranged on the input end of described light probe, and described second Polarization Controller is arranged on the output terminal of described light probe; Described light probe comprises input GRIN Lens, electro-optic crystal and output GRIN Lens, and wherein, this input GRIN Lens is used for described continuous light is become the spatial light of a branch of collimation; This electro-optic crystal is used to make the polarization direction of this spatial light to rotate under the effect of the variation of described tested voltage electric field; This output GRIN Lens is used for the spatial light of described electro-optic crystal outgoing is focused on, and generates output light.
Above-mentioned optical fibre voltage sensor, preferred described optical fibre voltage sensor also comprises circulator; Described first Polarization Controller is arranged on first end on the quiet bias field direction of described circulator, described light probe is arranged on second end on the quiet bias field direction of described circulator, and described second Polarization Controller is arranged on the 3rd end on the quiet bias field direction of described circulator; Described light probe comprises GRIN Lens, electro-optic crystal and catoptron, wherein, this GRIN Lens is used for described continuous light is become the spatial light of a branch of collimation, this electro-optic crystal is used to make the polarization direction of the spatial light of described collimation to rotate under the effect of the variation of described tested voltage electric field, this catoptron is used for the spatial light of electro-optic crystal outgoing is reflected back into electro-optic crystal and finally gets back to described GRIN Lens, this GRIN Lens also is used for the spatial light of described mirror reflects is focused on, and generates second end of exporting light and passing to described circulator.
Above-mentioned optical fibre voltage sensor, preferred described optical fibre voltage sensor also comprises circulator; Described first Polarization Controller is arranged on first end on the quiet bias field direction of described circulator, described light probe is arranged on second end on the quiet bias field direction of described circulator, and described second Polarization Controller is arranged on the 3rd end on the quiet bias field direction of described circulator; Described first Polarization Controller and first servo-drive system are formed the first electronic Polarization Controller, and described second Polarization Controller and second servo-drive system are formed the second electronic Polarization Controller; Described light probe comprises GRIN Lens, electro-optic crystal and catoptron, wherein, this GRIN Lens is used for described pulsed light is become the spatial light of a branch of collimation, this electro-optic crystal is used to make the polarization direction of the spatial light of described collimation to rotate under the effect of the variation of described tested voltage electric field, and this catoptron is used for the spatial light of electro-optic crystal outgoing is reflected back into electro-optic crystal and finally gets back to described GRIN Lens; And this GRIN Lens also is used for the spatial light of described mirror reflects is focused on, and generates second end of exporting light and passing to described circulator.
Above-mentioned optical fibre voltage sensor, preferred described electro-optic crystal comprises the BGO crystal.
Above-mentioned optical fibre voltage sensor, preferred described quick polarization attitude detecting device is made up of 1 * 4 coupling mechanism and 4 photo-detectors; Or described quick polarization attitude detecting device is made up of 1 * 4 coupling mechanism, 3 polarization beam apparatus and 7 photo-detectors.
Above-mentioned optical fibre voltage sensor, preferred described first Polarization Controller and described second Polarization Controller are the Polarization Controller for the Polarization Controller of spin fiber ring or extruding fiber optic loop.
Above-mentioned optical fibre voltage sensor, preferred described first Polarization Controller and described second Polarization Controller are electronic spin fiber ring Polarization Controller, the piezoelectric ceramics extruding electronic Polarization Controller of optical fiber type or the electronic Polarization Controller that gives semiconductor optical amplifier nonlinear polarization rotation effect.
On the other hand, the invention discloses a kind of control method based on above-mentioned optical fibre voltage sensor, comprise the steps: that continuous light that laser instrument sends is through first Polarization Controller after, use quick polarization attitude detecting device that this continuous light is detected; A circle will draw on the output poincare sphere of described quick polarization attitude detecting device; Regulate described first Polarization Controller circle on the described output poincare sphere is contracted to a bit gradually, obtain the principal state of polarization (psp) of electro-optic crystal in the light probe according to this point; Regulate the second output polarization controller, make described point move to arbitrary utmost point in described output poincare sphere the two poles of the earth; Regulate described first Polarization Controller, make and describedly expand as circle gradually on the poincare sphere, reach until this circle on the equator of described output poincare sphere in output.
Above-mentioned control method, the preferred Hi-pass filter filtering interference signals that also comprises the steps: to make electricity consumption, this undesired signal is non-equator rotation on described output poincare sphere or the equator rotation that is lower than power frequency.
In terms of existing technologies, our mask has following advantage:
The first, cancelled the expensive polarizer, analyzer and λ/4 wave plates, simplified the structure of sensor probe part (i.e. part between two GRIN Lens), needed the device of collimation to be simplified to 3 by 6, greatly reduce adjust difficult.
The second, by adjusting input polarization, seek out the principal state of polarization (psp) of BGO crystal, and follow the tracks of the variation of main attitude, can overcome effectively because principal state of polarization (psp) changes the error that causes, and the variation of output polarization attitude on poincare sphere that causes when guaranteeing electric field change be all the time around the equator rotation, thereby guarantee direction of an electric field and main shaft angle error minimum.
Three, use high speed polarization state detection technique, fast detecting is carried out in variation to polarization state, because the polarization state transformation period that external interference (as variation of temperature) causes is in level second, its frequency is significantly less than the pace of change of alternating current, be easy to utilize the wave filter filtering, thereby effectively evaded the influence of crystal natural birefringence, solved the temperature stability problem effectively.
Description of drawings
Fig. 1 is the structural representation of optical fibre voltage sensor embodiment in the prior art;
Fig. 2 is the structural representation of optical fibre voltage sensor embodiment of the present invention;
Fig. 3 is the structural representation of another embodiment of optical fibre voltage sensor of the present invention;
Fig. 4 is the structural representation of another embodiment of optical fibre voltage sensor of the present invention;
Fig. 5 is the structural representation of another embodiment of optical fibre voltage sensor of the present invention;
Fig. 6 is the flow chart of steps of optical fibre voltage sensor control method embodiment of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 2, Fig. 2 is the structural representation according to a kind of embodiment of optical fibre voltage sensor of the present invention, and this sensor comprises: the Hi-pass filter 25 of laser instrument 21, first Polarization Controller 22, light probe 20, second Polarization Controller 23, quick polarization attitude detecting device 24 and electricity.
Wherein, laser instrument 21 sends input light, and this continuous light is passed to described light probe 20 by first Polarization Controller 22; Described light probe 20 is used to respond to the variation of tested voltage electric field, will import after the optical processing output light of gained according to this variation of sensing and pass to quick polarization attitude detecting device 24 by second Polarization Controller 23; Quick polarization attitude detecting device 24 is converted to electric signal with the variation of polarization state, and the polarization state that causes through Hi-pass filter 25 filtering environmentals of an electricity changes then.
The difference of present embodiment and common optical fibre voltage sensor is, do not had the polarizer and λ/4 wave plates at the input end of electro-optic crystal, do not had analyzer at output terminal, therefore, simplified the structure of probe.And increased by first Polarization Controller 22 of a cheapness at the input end of light probe 20, increased by second Polarization Controller and quick polarization attitude detecting device 24 of a cheapness at light probe 20 output terminals.
Embodiment one
With reference to Fig. 3, Fig. 3 comprises the Hi-pass filter 35 of laser instrument 31, first Polarization Controller 32, light probe 30, second Polarization Controller 33, quick polarization attitude detecting device 34 and electricity for to be the structural representation of another embodiment of optical fibre voltage sensor of the present invention.Wherein, light probe 30 comprises input GRIN Lens 301, electro-optic crystal 302 and output GRIN Lens 303.
Wherein, first Polarization Controller 32 is arranged on the input end of described light probe 30, second Polarization Controller 33 is arranged on the output terminal of described light probe 30, promptly import light and arrive light probe 30, and output light arrives quick polarization attitude detecting device 34 by second Polarization Controller 33 by first Polarization Controller 32.Input GRIN Lens 301 receives the input light that transmits through incident opticals, and the continuous light that laser instrument sends is become the spatial light of a branch of collimation, after enter electro-optic crystal 302.Because the character of electro-optic crystal, the polarization direction of this spatial light also can change under the influence of the variation of tested voltage electric field, and its performance is that the polarization direction rotates.Output GRIN Lens 303 will focus on from the spatial light of outgoing in the electro-optic crystal 302, generates output light, and gets back to and should export light in the outgoing optical fiber and pass to second Polarization Controller 33.Quick polarization attitude detecting device 34 causes by the variation of described tested voltage electric field that polarization state changes with described output light and is converted to electric signal, and this electric signal is issued electricity Hi-pass filter 35.The polarization state that Hi-pass filter 35 filtering environmentals of electricity cause changes.
In this embodiment, electro-optic crystal 302 is the BGO crystal, also can be the crystal of other classifications, and the present invention does not limit at this.
First Polarization Controller 32 and second Polarization Controller 33 are manual Polarization Controller, can adopt the Polarization Controller of spin fiber ring for example or the so manual Polarization Controller of Polarization Controller of extruding fiber optic loop; In addition, first Polarization Controller 32 and second Polarization Controller 33 can also be the automatic polarization controller, can adopt for example electronic spin fiber ring Polarization Controller, the piezoelectric ceramics extruding electronic Polarization Controller of optical fiber type or give the such automatic polarization controller of electronic Polarization Controller of semiconductor optical amplifier nonlinear polarization rotation effect.
Quick polarization attitude detecting device 34 causes by the variation of described tested voltage electric field that polarization state changes with described output light and is converted to electric signal this is applied in this area and belongs to known technology, do not repeat them here.Need to prove that quick polarization attitude detecting device 34 is made up of 1 * 4 coupling mechanism and 4 photo-detectors among the present invention, perhaps form by 1 * 4 coupling mechanism, 3 polarization beam apparatus and 7 photo-detectors.The Hi-pass filter 35 of electricity since the polarization state that external interference causes change in level second (for example the polarization state that causes of temperature variation changes), its frequency is significantly smaller than the frequency of alternating current, and the polarization state that the Hi-pass filter 35 of electricity consumption can easily be caused this class external environment changes filtering.
Embodiment two
With reference to figure 4, Fig. 4 is the structural representation according to the another kind of embodiment of optical fibre voltage sensor of the present invention, and this sensor comprises: the Hi-pass filter 46 of laser instrument 41, first Polarization Controller 42, circulator 43, light probe 40, second Polarization Controller 44, quick polarization attitude detecting device 45 and electricity.Laser source 41 is sent continuous light.
In the circulator 43, first Polarization Controller 42 is arranged on first end on the quiet bias field direction of described circulator, light probe 40 is arranged on second end on the quiet bias field direction of circulator 43, and second Polarization Controller 44 is arranged on the 3rd end on the quiet bias field direction of circulator 43.Circulator 43 is a kind of incident wave that will enter its arbitrary port imports next port in proper order into according to the direction of being determined by quiet bias field multiport devices, and circulator 43 is the irreversible devices in a kind of multiport incident wave path, as shown, described continuous light is by behind first Polarization Controller 42, enter first end of circulator 43, by the characteristic of circulator 43 as can be known, this continuous light then brings out from second of circulator 43 and penetrates.The variation of the tested voltage electric field of light probe 40 induction will be imported after the optical processing output light of gained according to this variation of sensing and pass circulator 43 back, and circulator 43 should be exported light by second Polarization Controller 44 again and pass to quick polarization attitude detecting device 45.
Particularly, light probe 40 comprises GRIN Lens 401, electro-optic crystal 402 and catoptron 403, wherein, this GRIN Lens 401 is used for becoming the spatial light of a branch of collimation through the continuous light of circulator 43 second ends, and this electro-optic crystal 402 is used to make the polarization direction of the spatial light of collimation to rotate under the effect of the variation of described tested voltage electric field.Catoptron 403 is completely reflecting mirrors, be used for spatial light reflected back electro-optic crystal 402 with electro-optic crystal 402 outgoing, pass through the focusing of GRIN Lens 401 at last, this spatial light is focused on generation output light gets back in the optical fiber, get back to second end of circulator 43 again via optical fiber, by the characteristic of circulator 43 as can be known, this continuous light then brings out from the 3rd of circulator 43 and penetrates.Output light brings out to penetrate from the 3rd of circulator 43 and then reaches quick polarization attitude detecting device 45 by second Polarization Controller 44.Because the polarization state that causes of external interference changes in level second (for example the polarization state that causes of temperature variation changes), its frequency is significantly smaller than the frequency of alternating current, and the polarization state that the Hi-pass filter 46 of electricity consumption can easily be caused this class external environment changes filtering.
In this embodiment, electro-optic crystal 402 is the BGO crystal, when described spatial light is passed through electro-optic crystal, because the character of electro-optic crystal, the polarization direction of this spatial light also can change under the influence of the variation of tested voltage electric field, and its performance is that the polarization direction rotates; Certainly, an as above embodiment, electro-optic crystal 402 also can be the crystal of other classifications, as long as can reach the same in the present invention effect of BGO crystal.
First Polarization Controller 42 and second Polarization Controller 44 are manual Polarization Controller, can adopt the Polarization Controller of spin fiber ring for example or the so manual Polarization Controller of Polarization Controller of extruding fiber optic loop.Alternatively, first Polarization Controller 42 in this embodiment and second Polarization Controller 44 can also be the automatic polarization controller, can adopt for example electronic spin fiber ring Polarization Controller, the piezoelectric ceramics extruding electronic Polarization Controller of optical fiber type or give the such automatic polarization controller of electronic Polarization Controller of semiconductor optical amplifier nonlinear polarization rotation effect.
Quick polarization attitude detecting device 45 causes by the variation of described tested voltage electric field that polarization state changes with described output light and is converted to electric signal this is applied in this area and belongs to known technology, do not repeat them here, need to prove, quick polarization attitude detecting device 45 is made up of 1 * 4 coupling mechanism and 4 photo-detectors among the present invention, perhaps is made up of 1 * 4 coupling mechanism, 3 polarization beam apparatus and 7 photo-detectors.
Embodiment three
With reference to figure 5, Fig. 5 is the structural representation according to the another kind of embodiment of optical fibre voltage sensor of the present invention, and this sensor comprises: the Hi-pass filter 56 of laser instrument 51, first Polarization Controller 52, circulator 53, light probe 50, second Polarization Controller 54, quick polarization attitude detecting device 55 and electricity.Laser source 51 is sent pulsed light.
In the circulator 53, first Polarization Controller 52 is arranged on first end on the quiet bias field direction of described circulator, light probe 50 is arranged on second end on the quiet bias field direction of circulator 53, and second Polarization Controller 54 is arranged on the 3rd end on the quiet bias field direction of circulator 53.Circulator 53 is a kind of incident wave that will enter its arbitrary port imports next port in proper order into according to the direction of being determined by quiet bias field multiport devices, and circulator 53 is the irreversible devices in a kind of multiport incident wave path, as shown, described continuous light is by behind first Polarization Controller 52, enter first end of circulator 53, by the characteristic of circulator 53 as can be known, this continuous light then brings out from second of circulator 53 and penetrates.The variation of the tested voltage electric field of light probe 50 induction will be imported after the optical processing output light of gained according to this variation of sensing and pass circulator 53 back, and circulator 53 should be exported light by second Polarization Controller 54 again and pass to quick polarization attitude detecting device 55.
Particularly, light probe 50 comprises GRIN Lens 501, electro-optic crystal 502 and catoptron 503, wherein, this GRIN Lens 501 is used for becoming the spatial light of a branch of collimation through the continuous light of circulator 53 second ends, and this electro-optic crystal 502 is used to make the polarization direction of the spatial light of collimation to rotate under the effect of the variation of described tested voltage electric field.Catoptron 503 is catoptrons, be used for spatial light reflected back electro-optic crystal 502 with electro-optic crystal 502 outgoing, pass through the focusing of GRIN Lens 501 at last, this spatial light is focused on generation output light gets back in the optical fiber, get back to second end of circulator 53 again via optical fiber, by the characteristic of circulator 53 as can be known, this continuous light then brings out from the 3rd of circulator 53 and penetrates.Output light brings out to penetrate from the 3rd of circulator 53 and then reaches quick polarization attitude detecting device 55 by second Polarization Controller 54.Because the polarization state that causes of external interference changes in level second (for example the polarization state that causes of temperature variation changes), its frequency is significantly smaller than the frequency of alternating current, and the polarization state that the Hi-pass filter 56 of electricity consumption can easily be caused this class external environment changes filtering.
In this embodiment, electro-optic crystal 502 is the BGO crystal, when described spatial light is passed through electro-optic crystal, because the character of electro-optic crystal, the polarization direction of this spatial light also can change under the influence of the variation of tested voltage electric field, and its performance is that the polarization direction rotates; Certainly, an as above embodiment, electro-optic crystal 502 also can be the crystal of other classifications, as long as can reach the same in the present invention effect of BGO crystal.
Particularly, first Polarization Controller 52 in this embodiment and second Polarization Controller 54 are the automatic polarization controller, can adopt for example electronic spin fiber ring Polarization Controller, the piezoelectric ceramics extruding electronic Polarization Controller of optical fiber type or give the such automatic polarization controller of electronic Polarization Controller of semiconductor optical amplifier nonlinear polarization rotation effect
Wherein, first Polarization Controller 52 and first servo-drive system 57 are formed an electronic polarization state control system, when this system of described input light (pulsed light) process, can accurately carry out the polarization state rotation according to predefined requirement, equally, second Polarization Controller 54 and second servo-drive system 58 are also formed an electronic polarization state control system, when described output light through its output polarization attitude of out-of-date accurate adjustment.
Can reach the purpose that the input and output polarization state is reached accurate adjusting by servo-drive system by implementing this embodiment.
Implement Fig. 3, Fig. 4 and embodiment illustrated in fig. 5, not only simplified the structure of light probe with respect to prior art, reduced production cost, the polarization state that can also utilize wave filter filtering external interference to bring at an easy rate changes,
For technical scheme of the present invention better is described, provide a kind of and regulate described first Polarization Controller and second Polarization Controller with the principal state of polarization (psp) of finding out described electro-optic crystal and the detection method of polarization state based on optical fibre voltage sensor provided by the present invention, please refer to Fig. 5, Fig. 6 is based on optical fibre voltage sensor of the present invention and regulates described first Polarization Controller and second Polarization Controller process flow diagram with the embodiment of the detection method of the principal state of polarization (psp) of finding out described electro-optic crystal and polarization state, and this method comprises:
Step S601 uses quick polarization attitude detecting device to detect the described input light that passes through first Polarization Controller; Step S602, a circle can draw on the output poincare sphere of described polarization state detecting device; Step S603 regulates first Polarization Controller and makes that exporting the circle that draws on the poincare sphere is reduced into a bit gradually, and this point is principal state of polarization (psp); Step S604 regulates second Polarization Controller, makes this shop move to the arbitrary utmost point in output poincare sphere the two poles of the earth; Step S605 regulates first Polarization Controller, makes this point expand as a circle gradually until the equator that reaches the output poincare sphere.
Particularly, illustrate in conjunction with embodiment illustrated in fig. 2, the continuous light of light source 21 output through first Polarization Controller 22 after, use quick polarization attitude detecting device 24 to detect, this moment is because Pockels effect, the circle that will draw on the output poincare sphere of quick polarization attitude detecting device 24 is regulated first Polarization Controller 22 this moment and is made the circles that draw on the output poincare sphere be reduced into a bit, is principal state of polarization (psp); Regulate second Polarization Controller 23 and make the principal state of polarization (psp) (described point) that has obtained move to the arbitrary utmost point in output poincare sphere the two poles of the earth, adjust first Polarization Controller 22 at last, make this point expand as a circle that reaches output poincare sphere equator gradually.
Because this moment, the variation of electric field always made the equator rotation of output polarization attitude along described poincare sphere, so any non-equator rotation or go up rotation under the line it all is undesired signal that but frequency is lower than the motion of current ac frequency, the Hi-pass filter 25 direct filterings of directly electricity consumption.
Need to prove, this detection method is not only applicable to the optical fibre voltage sensor of embodiment illustrated in fig. 2, also be applicable to Fig. 3, Fig. 4 and the optical fibre voltage sensor that provides that goes out embodiment shown in Figure 5, its method of adjustment can not repeat them here with reference to the explanation of embodiment illustrated in fig. 2.
In sum, optical fibre voltage sensor provided by the invention makes production cost reduce by simplifying the structure of light probe; By adjusting input polarization, find the principal state of polarization (psp) of BGO crystal, and follow the tracks of the variation of main attitude, can overcome effectively because principal state of polarization (psp) changes the error that causes; By using high speed polarization state detection technique, fast detecting is carried out in variation to polarization state, because the polarization state transformation period that external interference (as variation of temperature) causes is in level second, its frequency is significantly less than the pace of change of alternating current, be easy to utilize the wave filter filtering, thereby effectively evaded the influence of crystal natural birefringence, solved the temperature stability problem effectively.
More than a kind of optical fibre voltage sensor provided by the present invention and control method thereof are described in detail, used specific embodiment herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part in specific embodiments and applications all can change.In sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. an optical fibre voltage sensor is characterized in that, comprises the Hi-pass filter of laser instrument, first Polarization Controller, light probe, second Polarization Controller, quick polarization attitude detecting device and electricity that order is provided with.
2. optical fibre voltage sensor according to claim 1 is characterized in that,
Described first Polarization Controller is arranged on the input end of described light probe, and described second Polarization Controller is arranged on the output terminal of described light probe;
Described light probe comprises input GRIN Lens, electro-optic crystal and output GRIN Lens, and wherein, this input GRIN Lens is used for described continuous light is become the spatial light of a branch of collimation; This electro-optic crystal is used to make the polarization direction of this spatial light to rotate under the effect of the variation of described tested voltage electric field; This output GRIN Lens is used for the spatial light of described electro-optic crystal outgoing is focused on, and generates output light.
3. optical fibre voltage sensor according to claim 1 is characterized in that described optical fibre voltage sensor also comprises circulator;
Described first Polarization Controller is arranged on first end on the quiet bias field direction of described circulator, described light probe is arranged on second end on the quiet bias field direction of described circulator, and described second Polarization Controller is arranged on the 3rd end on the quiet bias field direction of described circulator;
Described light probe comprises GRIN Lens, electro-optic crystal and catoptron, and wherein, this GRIN Lens is used for described continuous light is become the spatial light of a branch of collimation;
This electro-optic crystal is used to make the polarization direction of the spatial light of described collimation to rotate under the effect of the variation of described tested voltage electric field;
This catoptron is used for the spatial light of electro-optic crystal outgoing is reflected back into electro-optic crystal and finally gets back to described GRIN Lens;
This GRIN Lens also is used for the spatial light of described mirror reflects is focused on, and generates second end of exporting light and passing to described circulator.
4. optical fibre voltage sensor according to claim 1 is characterized in that described optical fibre voltage sensor also comprises circulator;
Described first Polarization Controller is arranged on first end on the quiet bias field direction of described circulator, described light probe is arranged on second end on the quiet bias field direction of described circulator, and described second Polarization Controller is arranged on the 3rd end on the quiet bias field direction of described circulator;
Described first Polarization Controller and first servo-drive system are formed the first electronic Polarization Controller, and described second Polarization Controller and second servo-drive system are formed the second electronic Polarization Controller;
Described light probe comprises GRIN Lens, electro-optic crystal and catoptron, wherein, this GRIN Lens is used for described pulsed light is become the spatial light of a branch of collimation, this electro-optic crystal is used to make the polarization direction of the spatial light of described collimation to rotate under the effect of the variation of described tested voltage electric field, and this catoptron is used for the spatial light of electro-optic crystal outgoing is reflected back into electro-optic crystal and finally gets back to described GRIN Lens; And this GRIN Lens also is used for the spatial light of described mirror reflects is focused on, and generates second end of exporting light and passing to described circulator.
5. according to each described optical fibre voltage sensor of claim 1 to 4, it is characterized in that: described electro-optic crystal comprises the BGO crystal.
6. optical fibre voltage sensor according to claim 5 is characterized in that,
Described quick polarization attitude detecting device is made up of 1 * 4 coupling mechanism and 4 photo-detectors; Or
Described quick polarization attitude detecting device is made up of 1 * 4 coupling mechanism, 3 polarization beam apparatus and 7 photo-detectors.
7. optical fibre voltage sensor according to claim 6 is characterized in that,
Described first Polarization Controller and described second Polarization Controller are the Polarization Controller for the Polarization Controller of spin fiber ring or extruding fiber optic loop.
8. optical fibre voltage sensor according to claim 6 is characterized in that,
Described first Polarization Controller and described second Polarization Controller are electronic spin fiber ring Polarization Controller, the piezoelectric ceramics extruding electronic Polarization Controller of optical fiber type or the electronic Polarization Controller that gives semiconductor optical amplifier nonlinear polarization rotation effect.
9. the control method based on optical fibre voltage sensor as claimed in claim 1 is characterized in that, comprises the steps:
The continuous light that laser instrument sends through first Polarization Controller after, use quick polarization attitude detecting device that this continuous light is detected;
A circle will draw on the output poincare sphere of described quick polarization attitude detecting device;
Regulate described first Polarization Controller circle on the described output poincare sphere is contracted to a bit gradually, obtain the principal state of polarization (psp) of electro-optic crystal in the light probe according to this point;
Regulate the second output polarization controller, make described point move to arbitrary utmost point in described output poincare sphere the two poles of the earth;
Regulate described first Polarization Controller, make and describedly expand as circle gradually on the poincare sphere, reach until this circle on the equator of described output poincare sphere in output.
10. control method according to claim 9 is characterized in that this method also comprises the steps:
Make the Hi-pass filter filtering interference signals of electricity consumption, this undesired signal is non-equator rotation on described output poincare sphere or the equator rotation that is lower than power frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010285668 CN101968507B (en) | 2010-09-16 | 2010-09-16 | Optical fiber voltage sensor and adjustment method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010285668 CN101968507B (en) | 2010-09-16 | 2010-09-16 | Optical fiber voltage sensor and adjustment method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101968507A true CN101968507A (en) | 2011-02-09 |
| CN101968507B CN101968507B (en) | 2013-03-13 |
Family
ID=43547691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010285668 Expired - Fee Related CN101968507B (en) | 2010-09-16 | 2010-09-16 | Optical fiber voltage sensor and adjustment method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101968507B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928647A (en) * | 2012-10-29 | 2013-02-13 | 易能（中国）电力科技有限公司 | Optic voltage sensing system and corresponding iterative demodulation method |
| WO2013087013A1 (en) * | 2011-12-13 | 2013-06-20 | 北京航天时代光电科技有限公司 | Optical voltage sensor for three-phase common light source |
| CN103308783A (en) * | 2013-05-23 | 2013-09-18 | 国家电网公司 | Distributed feedback (DFB) laser-based optical crystal electric field sensor |
| CN103424635A (en) * | 2013-08-05 | 2013-12-04 | 国家电网公司 | Electric field strength transducer capable of working in high-electric-field environments |
| CN103900469A (en) * | 2014-03-20 | 2014-07-02 | 哈尔滨工业大学 | Double-optical-fiber coupling ball microscale sensor based on polarization state detection |
| CN103969489A (en) * | 2014-05-19 | 2014-08-06 | 重庆大学 | Non-contact type overvoltage sensor based on electro-optic effect |
| CN104685363A (en) * | 2012-08-21 | 2015-06-03 | Abb技术有限公司 | Electro optical voltage transducer signal processing system |
| CN108693413A (en) * | 2018-04-25 | 2018-10-23 | 华北电力大学 | Rotary optical electric-field sensor and its measurement electric field methods |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105751A (en) * | 1985-07-30 | 1987-01-28 | 清华大学 | The manufacture method of ac-dc fiber voltage (electric field) meter |
| CN1831486A (en) * | 2006-04-21 | 2006-09-13 | 北京交通大学 | Lateral stress sensing system based on double-mode photon cystal coptical fibre and implementing method |
| CN101114886A (en) * | 2007-08-30 | 2008-01-30 | 北京交通大学 | Polarization type optical caching device and regulating method thereof |
| CN101539591A (en) * | 2009-04-16 | 2009-09-23 | 电子科技大学 | Electro-optic sampling method based on polarization rotation effect of electroabsorption modulator |
-
2010
- 2010-09-16 CN CN 201010285668 patent/CN101968507B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105751A (en) * | 1985-07-30 | 1987-01-28 | 清华大学 | The manufacture method of ac-dc fiber voltage (electric field) meter |
| CN1831486A (en) * | 2006-04-21 | 2006-09-13 | 北京交通大学 | Lateral stress sensing system based on double-mode photon cystal coptical fibre and implementing method |
| CN101114886A (en) * | 2007-08-30 | 2008-01-30 | 北京交通大学 | Polarization type optical caching device and regulating method thereof |
| CN101539591A (en) * | 2009-04-16 | 2009-09-23 | 电子科技大学 | Electro-optic sampling method based on polarization rotation effect of electroabsorption modulator |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013087013A1 (en) * | 2011-12-13 | 2013-06-20 | 北京航天时代光电科技有限公司 | Optical voltage sensor for three-phase common light source |
| CN104685363B (en) * | 2012-08-21 | 2017-09-29 | Abb技术有限公司 | electro-optical voltage transducer signal processing system |
| CN104685363A (en) * | 2012-08-21 | 2015-06-03 | Abb技术有限公司 | Electro optical voltage transducer signal processing system |
| CN102928647A (en) * | 2012-10-29 | 2013-02-13 | 易能（中国）电力科技有限公司 | Optic voltage sensing system and corresponding iterative demodulation method |
| CN102928647B (en) * | 2012-10-29 | 2016-02-03 | 易能乾元（北京）电力科技有限公司 | Optical profile type voltage sensor system and corresponding iterative demodulation method |
| CN103308783B (en) * | 2013-05-23 | 2015-12-09 | 国家电网公司 | Based on the optical crystal electric-field sensor of Distributed Feedback Laser |
| CN103308783A (en) * | 2013-05-23 | 2013-09-18 | 国家电网公司 | Distributed feedback (DFB) laser-based optical crystal electric field sensor |
| CN103424635A (en) * | 2013-08-05 | 2013-12-04 | 国家电网公司 | Electric field strength transducer capable of working in high-electric-field environments |
| CN103900469B (en) * | 2014-03-20 | 2017-01-11 | 哈尔滨工业大学 | Double-optical-fiber coupling ball microscale sensor based on polarization state detection |
| CN103900469A (en) * | 2014-03-20 | 2014-07-02 | 哈尔滨工业大学 | Double-optical-fiber coupling ball microscale sensor based on polarization state detection |
| CN103969489A (en) * | 2014-05-19 | 2014-08-06 | 重庆大学 | Non-contact type overvoltage sensor based on electro-optic effect |
| CN108693413A (en) * | 2018-04-25 | 2018-10-23 | 华北电力大学 | Rotary optical electric-field sensor and its measurement electric field methods |
| CN108693413B (en) * | 2018-04-25 | 2023-09-19 | 华北电力大学 | Rotary optical electric field sensor and electric field measuring method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101968507B (en) | 2013-03-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101968507B (en) | Optical fiber voltage sensor and adjustment method thereof | |
| CN102928680B (en) | Electric field measurement system based on polarization compensation | |
| CN103076155B (en) | Optical fiber Verdet constant measurement system on basis of double optical paths | |
| CN101968508B (en) | All-fiber current sensor and polarization state control method thereof | |
| CN106443551B (en) | A kind of all-fiber current transformator monitoring system | |
| KR101094363B1 (en) | Optical fiber current sensor and sensing method thereof | |
| CN113945744B (en) | All-fiber direct current transformer temperature compensation system and method | |
| CN206696332U (en) | A kind of optical current mutual inductor | |
| CN103605005B (en) | A kind of photoelectric integration electric-field measuring system based on two Y waveguides | |
| CN108106817B (en) | Method for improving polarization performance measurement accuracy of Y waveguide device | |
| CN107179431B (en) | Optical fiber current sensing device and method based on birefringence real-time measurement | |
| CN114577245B (en) | Optical fiber sensing system capable of simultaneously measuring current and vibration | |
| CN204479632U (en) | A kind of annular cavate all-fiber current sensor | |
| CN209764932U (en) | Polarization-detecting closed-loop all-fiber current transformer | |
| CN106940395B (en) | Optical current transformer | |
| CN203606428U (en) | Optical fiber current sensor | |
| CN106706991B (en) | Optical current transformer | |
| CN206556842U (en) | LiNbO3 phase-modulator performance detecting systems | |
| CN105717344B (en) | A kind of half-wave voltage of phase modulator measuring system and measurement method | |
| CN109375137B (en) | 1/4 wave plate phase delay automatic testing device and method for all-fiber current transformer | |
| CN109946511B (en) | Integrated optical waveguide electric power sensing chip and measuring system constructed by same | |
| CN114689272A (en) | Device and method for measuring polarization-dependent loss of polarization-maintaining optical fiber device | |
| CN203405499U (en) | A reflective all-fiber optical current transformer | |
| CN206818784U (en) | The optical fiber current sensing device measured in real time based on birefringence | |
| CN106646183B (en) | SLD light source test system |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 |