CN203164254U - Reciprocity type reflection optical voltage sensing unit - Google Patents
Reciprocity type reflection optical voltage sensing unit Download PDFInfo
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- CN203164254U CN203164254U CN 201320077985 CN201320077985U CN203164254U CN 203164254 U CN203164254 U CN 203164254U CN 201320077985 CN201320077985 CN 201320077985 CN 201320077985 U CN201320077985 U CN 201320077985U CN 203164254 U CN203164254 U CN 203164254U
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- optical fiber
- tail optical
- polarization
- maintaining
- circulator
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Abstract
The utility model brings forward a reciprocity type reflection optical voltage sensing unit comprising a sensing head, a four-port polarization-maintaining coupler, and a three-port polarization-maintaining circulator. Two beams of cross line polarized light generated by an optical path portion pass through a first tail fiber of the four-port polarization-maintaining coupler and then are transmitted to the sensing unit; a second tail fiber of the four-port polarization-maintaining coupler and a first tail fiber of the three-port polarization-maintaining circulator are welded by 0 degree to form a branch circuit I; a third tail fiber of the four-port polarization-maintaining coupler and a third tail fiber of the three-port polarization-maintaining circulator are welded by 90 degrees to form a branch circuit II; a fourth tail fiber of the four-port polarization-maintaining coupler is idle; and a second tail fiber of the three-port polarization-maintaining circulator is connected with a tail fiber of the sensing head. The sensing unit and the system thereof utilize the polarization-maintaining coupler and the polarization-maintaining circulator to realize mode interchanging of the two beams of cross polarization light, thereby improving the anti-interference capability of the optical path. Moreover, the provided sensing unit has the advantages of small size, light weight, simple structure, and being free of an electromagnetic interference and the like.
Description
Technical field
The utility model belongs to the voltage transformer (VT) field, is specifically related to a kind of reciprocal type reflective optic voltage sensor unit.
Background technology
Optical voltage transformer is that a kind of light signal induced voltage and process signal of utilizing handled the mutual inductor that obtains output voltage.Comparing traditional induction and capacitance type potential transformer has many incomparable advantages, has become the focus of voltage transformer (VT) area research, is voltage transformer (VT) development in future trend.Wherein the voltage sensor unit is the key component that realizes optoelectronic induction.The two-way optical output signal that mostly needs the two-way Electro-Optical Sensor Set to receive to have carried modulation intelligence based on the voltage sensor unit of the optical voltage transformer of Pu Keer (Pockels) effect makes that the structure of whole optical voltage transformer is comparatively complicated at present.
The utility model content
In order to overcome the above-mentioned defective of prior art, one of the purpose of this utility model is to propose a kind of antijamming capability reciprocal type reflective optic voltage sensor unit strong, simple in structure.
The utility model is achieved by the following technical solution:
A kind of reciprocal type reflective optic voltage sensor unit, this sensing unit comprises sensing head, comprise that also four port polarization-maintaining couplers and three ports protect inclined to one side circulator, described four port polarization-maintaining couplers and three ports are protected inclined to one side circulator and all are connected with a tail optical fiber in each port;
The two bundle orhtogonal linear polarizaiton light that light path part produces transfer in this sensing unit by first tail optical fiber of described four port polarization-maintaining couplers; First tail optical fiber that second tail optical fiber of described four port polarization-maintaining couplers and three ports are protected inclined to one side circulator carries out 0 ° of welding, forms branch road I; The 3rd tail optical fiber that the 3rd tail optical fiber of described four port polarization-maintaining couplers and three ports are protected inclined to one side circulator carries out 90 ° of weldings, forms branch road II; The 4th tail optical fiber of described four port polarization-maintaining couplers is idle, and second tail optical fiber that described three ports are protected inclined to one side circulator is connected with the tail optical fiber of sensing head.
Further, described sensing head comprises collimating apparatus and electro-optic crystal, be coated with on the light entrance face of described electro-optic crystal on anti-reflection film, the another side relative with light entrance face and be coated with reflectance coating, described collimating apparatus and electro-optic crystal are coated with a Joint of anti-reflection film, are connected with the tail optical fiber of this sensing head on the light entrance face of described collimating apparatus; The upper and lower end face of described electro-optic crystal is separately installed with electrode.
Further, first tail optical fiber of described four port polarization-maintaining couplers, second tail optical fiber, the 3rd tail optical fiber and the 4th tail optical fiber, the three ports tail optical fiber of protecting first tail optical fiber, second tail optical fiber and the 3rd tail optical fiber and the sensing head of inclined to one side circulator all adopts polarization maintaining optical fibre.
Further, described sensing head is packaged in the screening can.
Further, described light path part comprises light source, circulator, Y waveguide modulator, polarising beam splitter and photoelectric commutator, described circulator links to each other with photoelectric commutator with light source, Y waveguide modulator respectively, described Y waveguide modulator links to each other with polarising beam splitter, and the tail optical fiber of described polarising beam splitter is connected with first tail optical fiber of described four port polarization-maintaining couplers.
The beneficial effects of the utility model are:
1, the utility model utilizes polarization-maintaining coupler and protects the modes swap that inclined to one side circulator has been realized two bundle crossed polarized lights, forms the reflective light path of accurate reciprocity, has improved the antijamming capability of light path.
2, the optical element volume that adopts of the utility model is little, in light weight, simple in structure, and is not subjected to electromagnetic interference (EMI), and is little to tested electric field perturbations.
Description of drawings
Fig. 1 is the structure principle chart of the utility model reciprocal type reflective optic voltage sensor unit;
Fig. 2 is the structure principle chart of light path part;
Among the figure, 1-four port polarization-maintaining couplers, 2-three ports are protected inclined to one side circulator, 3-collimating apparatus, 4-electro-optic crystal, the 5-anti-reflection film, 6-reflectance coating, 7-electrode, 8-light source, the 9-circulator, 10-Y waveguide modulator, 11-polarising beam splitter (hereinafter to be referred as PBS), 12-photoelectric commutator.
Embodiment
Below in conjunction with accompanying drawing reciprocal type reflective optic voltage sensor of the present utility model unit is described in further detail.
As shown in Figure 1, this routine reciprocal type reflective optic voltage sensor unit comprises that four port polarization-maintaining couplers 1, three ports protect inclined to one side circulator 2 and sensing head.Wherein, be connected with in turn along clockwise direction on the four port polarization-maintaining couplers 1 and be provided with the first tail optical fiber a, the second tail optical fiber b, the 3rd tail optical fiber c and the 4th tail optical fiber d, the first tail optical fiber a and the 4th tail optical fiber d are connected on two ports of four port polarization-maintaining couplers, 1 left end, and the second tail optical fiber b and the 3rd tail optical fiber c symmetry are connected on two ports of four port polarization-maintaining couplers, 1 right-hand member; Similarly, three ports are protected and are connected with the first tail optical fiber a ', the second tail optical fiber b ' and the 3rd tail optical fiber c ' on the inclined to one side circulator 2 along clockwise direction in turn; The two bundle orhtogonal linear polarizaiton light that light path part produces transfer in this sensing unit by the first tail optical fiber a of four port polarization-maintaining couplers 1; The first tail optical fiber a ' that the second tail optical fiber b of four port polarization-maintaining couplers 1 and three ports are protected inclined to one side circulator carries out 0 ° of welding, forms branch road I; The 3rd tail optical fiber c ' that the 3rd tail optical fiber c of four port polarization-maintaining couplers 1 and three ports are protected inclined to one side circulator carries out 90 ° of weldings, forms branch road II; The 4th tail optical fiber d of four port polarization-maintaining couplers 1 is idle, and the second tail optical fiber b ' that three ports are protected inclined to one side circulator is connected with the tail optical fiber of sensing head.Each above-mentioned tail optical fiber all can adopt polarization maintaining optical fibre.
Sensing head can adopt insulating material to make, insulating property are good, it comprises that collimating apparatus 3(can adopt collimation lens) and electro-optic crystal 4, be coated with on the front end face of electro-optic crystal 4 (being light entrance face) on the rear end face (namely one side) relative with light entrance face of anti-reflection film 5, electro-optic crystal 4 and be coated with reflectance coating 6, collimating apparatus 3 and electro-optic crystal 4 are coated with a Joint of anti-reflection film, are connected with on the light entrance face of collimating apparatus with three ports and protect the tail optical fiber that the second tail optical fiber b ' of inclined to one side circulator 2 carries out welding; The upper and lower end face of electro-optic crystal 4 also is separately installed with electrode 7.This electrode is used for the electromotive force of induction field, and adopts laterally modulation, and the direction of an electric field that namely is applied on the electro-optic crystal 4 is vertical with optical propagation direction.
The principle of work of this reciprocal type reflective optic voltage sensor unit is:
The two bundle orhtogonal linear polarizaiton light that produce from light path part transmit, also enter sensing head through the branch road I along X pattern and the Y mode of polarization maintaining optical fibre respectively, electrooptical effect takes place under the effect of electric field in the electro-optic crystal 4 of sensing head outside, make the two bundle orhtogonal linear polarizaiton light of propagating in crystal produce phase differential, the phase place extent is relevant with extra electric field.Pass through electro-optic crystal 4 after linearly polarized light is reflected again, phase differential doubles.Through the branch road II, two restraint orhtogonal linear polarizaiton polarisation of light directions revolves and turn 90 degrees after three ports are protected the 3rd tail optical fiber c ' output of inclined to one side circulator 2; At this moment, originally become along the Y mode of polarization maintaining optical fibre along the orhtogonal linear polarizaiton light of polarization maintaining optical fibre X mode propagation and propagate, originally the orhtogonal linear polarizaiton light of propagating along the polarization maintaining optical fibre Y mode becomes the X mode propagation along polarization maintaining optical fibre, has realized the modes swap of two bundle crossed polarized lights.Afterwards along the first tail optical fiber a of four port polarization-maintaining couplers 1 output, through the photoelectric commutator 12 of light path part light signal is converted to electric signal.The end-of-job of this routine described sensing unit, the electric signal after the conversion can also be sent to existing signal processing unit and proceed the follow-up signal processing.
As shown in Figure 2, light path part mainly is made up of light source 8, circulator 9, Y waveguide modulator 10, PBS11 and photoelectric commutator 12.Its principle of work is: the light that light source 8 sends enters Y waveguide modulator 10 through behind the circulator 9; The Y waveguide modulator is also referred to as the integrated optics phase-modulator, be a kind of multifunction device, formed by a Y type beam splitter and two phase-modulators, adopt this Y waveguide modulator can make the mechanism of light path part compacter, reduce secondary cabinet volume, more convenient operation; The light that enters Y waveguide modulator 10 is divided into two bundle polarized lights, wherein enter PBS11 with another Shu Yitong behind a branch of half-twist, two bundle polarized lights are adjusted to behind the two bundle orhtogonal linear polarizaiton light (first tail optical fiber that this polarization maintaining optical fibre is four port polarization-maintaining couplers 1 a) reaches this routine sensing unit by polarization maintaining optical fibre; After the sensing head in the sensing unit, the two bundle orhtogonal linear polarizaiton light that carried information of voltage to be measured return along original optical path, in Y waveguide modulator 10, interfere, enter photoelectric commutator 12 through circulator 9 then light signal is converted to electric signal, for subsequent operation.
The reciprocal type reflective optic voltage sensor unit that this is routine, adopt laterally modulation, utilize the electrooptical effect induction field signal of electro-optic crystal under External Electrical Field, and utilize four port polarization-maintaining couplers and three ports to protect the modes swap that inclined to one side circulator has been realized two bundle orhtogonal linear polarizaiton light, thereby formed a kind of reciprocal type reflecting light line structure, two bundle orhtogonal linear polarizaiton light of outgoing have only carried the phase-modulated information of electro-optic crystal to them.The optical module of this optical voltage sensing unit is few, simple in structure, volume is little, in light weight; Formed good insulation preformance by insulating material; The reflective light path of reciprocal type can improve the antijamming capability in the long optic path process greatly, can also utilize the digital closed loop signal detection technique in the optical current mutual inductor, has improved dynamic range and the response sensitivity of system.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although with reference to above-described embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement embodiment of the present utility model, and do not break away from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (5)
1. reciprocal type reflective optic voltage sensor unit, this sensing unit comprises sensing head, it is characterized in that: comprise that also four port polarization-maintaining couplers and three ports protect inclined to one side circulator, described four port polarization-maintaining couplers and three ports are protected inclined to one side circulator and all are connected with a tail optical fiber in each port;
The two bundle orhtogonal linear polarizaiton light that light path part produces transfer in this sensing unit by first tail optical fiber of described four port polarization-maintaining couplers; First tail optical fiber that second tail optical fiber of described four port polarization-maintaining couplers and three ports are protected inclined to one side circulator carries out 0 ° of welding, forms branch road I; The 3rd tail optical fiber that the 3rd tail optical fiber of described four port polarization-maintaining couplers and three ports are protected inclined to one side circulator carries out 90 ° of weldings, forms branch road II; The 4th tail optical fiber of described four port polarization-maintaining couplers is idle, and second tail optical fiber that described three ports are protected inclined to one side circulator is connected with the tail optical fiber of sensing head.
2. reciprocal type reflective optic voltage sensor according to claim 1 unit is characterized in that:
Described sensing head comprises collimating apparatus and electro-optic crystal, be coated with on the light entrance face of described electro-optic crystal on anti-reflection film, the another side relative with light entrance face and be coated with reflectance coating, described collimating apparatus and electro-optic crystal are coated with a Joint of anti-reflection film, are connected with the tail optical fiber of this sensing head on the light entrance face of described collimating apparatus; The upper and lower end face of described electro-optic crystal is separately installed with electrode.
3. reciprocal type reflective optic voltage sensor according to claim 1 unit is characterized in that:
The tail optical fiber that first tail optical fiber of described four port polarization-maintaining couplers, second tail optical fiber, the 3rd tail optical fiber and the 4th tail optical fiber, three ports are protected first tail optical fiber, second tail optical fiber and the 3rd tail optical fiber and the sensing head of inclined to one side circulator all adopts polarization maintaining optical fibre.
4. reciprocal type reflective optic voltage sensor according to claim 1 unit is characterized in that:
Described sensing head is packaged in the screening can.
5. reciprocal type reflective optic voltage sensor according to claim 1 unit is characterized in that:
Described light path part comprises light source, circulator, Y waveguide modulator, polarising beam splitter and photoelectric commutator, described circulator links to each other with photoelectric commutator with light source, Y waveguide modulator respectively, described Y waveguide modulator links to each other with polarising beam splitter, and the tail optical fiber of described polarising beam splitter is connected with first tail optical fiber of described four port polarization-maintaining couplers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320077985 CN203164254U (en) | 2013-02-20 | 2013-02-20 | Reciprocity type reflection optical voltage sensing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320077985 CN203164254U (en) | 2013-02-20 | 2013-02-20 | Reciprocity type reflection optical voltage sensing unit |
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| CN203164254U true CN203164254U (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320077985 Expired - Lifetime CN203164254U (en) | 2013-02-20 | 2013-02-20 | Reciprocity type reflection optical voltage sensing unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777056A (en) * | 2013-12-13 | 2014-05-07 | 国家电网公司 | Vertical modulation reciprocity type optical voltage sensor |
| CN108387775A (en) * | 2017-12-29 | 2018-08-10 | 长园深瑞继保自动化有限公司 | The sensor and its measurement method of electrical power are measured using light carrier |
-
2013
- 2013-02-20 CN CN 201320077985 patent/CN203164254U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777056A (en) * | 2013-12-13 | 2014-05-07 | 国家电网公司 | Vertical modulation reciprocity type optical voltage sensor |
| CN108387775A (en) * | 2017-12-29 | 2018-08-10 | 长园深瑞继保自动化有限公司 | The sensor and its measurement method of electrical power are measured using light carrier |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |