CN204008794U - Interferential full optical-fiber voltage transformer (VT) between a kind of monolateral lobe - Google Patents
Interferential full optical-fiber voltage transformer (VT) between a kind of monolateral lobe Download PDFInfo
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- CN204008794U CN204008794U CN201420391161.3U CN201420391161U CN204008794U CN 204008794 U CN204008794 U CN 204008794U CN 201420391161 U CN201420391161 U CN 201420391161U CN 204008794 U CN204008794 U CN 204008794U
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Abstract
Interferential full optical-fiber voltage transformer (VT) between a kind of monolateral lobe, only extract an intermode interference output sidelobe, and reject the intermode interference voltage transformer (VT) of light source fluctuation impact by reference signal, utilize the inverse piezoelectric effect of quartz crystal to modulate the intermode phase differential of polarization maintaining optical fibre, by polarization maintaining optical fibre and the welding of multimode optical fiber off-axis are realized to the extraction to an interference output sidelobe, interfere output sidelobe intensity to obtain amplitude and the phase information of tested voltage by detection.Compared with prior art, the beneficial effects of the utility model are: utilize the interference of two low order linear polarization intermodes that transmit in a polarization maintaining optical fibre to realize sensing measurement, reject the impact of light source fluctuation on system accuracy, ensure the sensitivity of measuring system, compare with conventional interference type optical fiber sensor that to have Installation and Debugging simple, ensure steady operation and other merits.
Description
Technical field
The utility model relates to Fiber-Optic Voltage field, interferential full optical-fiber voltage transformer (VT) between especially a kind of monolateral lobe.
Background technology
The current optical voltage transformer research still Pockels effects that adopt Pockels crystal realizes more, its ultimate principle is to utilize tested voltage to be modulated at the polarization state of propagating light beam in crystal, detect by the mode that detects polarized light corner the voltage being applied on crystal, although the method is simple in structure, but because its light path is made up of discrete optical element, be difficult to ensure stability and the long-term reliability of sensor-based system, and be subject to temperature, the impact of the environmental factors such as vibration, so the voltage transformer (VT) based on the method still rests on the laboratory study stage, be difficult to practical.
Intermode interference technology, as a kind of new technology of sensory field of optic fibre, obtains the extensive concern of Chinese scholars since the nineties in 20th century.The interference of two low order linear polarization intermodes that this technology utilization is transmitted in a polarization maintaining optical fibre realizes sensing measurement, compares and has simple in structure, steady operation and other merits with conventional interference type optical fiber sensor, is applied in all many-sides.Utilize the Fiber-Optic Voltage of polarization maintaining optical fibre intermode interference technology also to launch research in recent years, and obtained desirable effect.But in the intermode interference voltage sensor scheme of having reported, be difficult to adopt full optical fiber mode to interfere output intensity sidelobe to extract by two of intermode interference because of the restriction of optical device aspect, destroy all optical fibre structure of whole sensor-based system, caused whole system Installation and Debugging difficulty, and its long-time stability are also difficult to ensure.
Utility model content
The purpose of this utility model is to provide interferential full optical-fiber voltage transformer (VT) between a kind of monolateral lobe, only extract an intermode interference output sidelobe, and reject the intermode interference voltage transformer (VT) of light source fluctuation impact by reference signal, by polarization maintaining optical fibre and the welding of multimode optical fiber off-axis are realized to the extraction to an interference output sidelobe, interfere output sidelobe intensity to obtain amplitude and the phase information of tested voltage by detection.
For achieving the above object, the utility model is realized by the following technical solutions:
Interferential full optical-fiber voltage transformer (VT) between a kind of monolateral lobe, comprise narrow-band light source device, single-mode fiber, 1 × 2 fiber coupler, fibre optic polarizer, piezoelectric ceramics PZT, oval core polarization maintaining optical fibre, voltage sensor head, multimode optical fiber, photodetector one, photodetector two, signals collecting and treating apparatus, described narrow-band light source device is connected with 1 × 2 fiber coupler by single-mode fiber, 1 × 2 one of fiber coupler output terminal is connected with fibre optic polarizer by single-mode fiber, fibre optic polarizer is connected with piezoelectric ceramics PZT, piezoelectric ceramics PZT output terminal is connected with voltage sensor head input end by oval core polarization maintaining optical fibre, voltage sensor head output terminal is connected to oval core polarization maintaining optical fibre by oval core polarization maintaining optical fibre and is connected multimode optical fiber with the off-axis weld of multimode optical fiber again, multimode optical fiber and photo-detector two, signals collecting and treating apparatus connect, a part of output terminal of signals collecting and treating apparatus is connected with piezoelectric ceramics PZT,
Described another output terminal of 1 × 2 fiber coupler is connected with photodetector one by single-mode fiber, photodetector one is connected with signals collecting and treating apparatus, and signals collecting and treating apparatus another part output terminal complete digital output and analog output.
Described voltage sensor head is made up of a quartz crystal cylinder of two piece metal aluminium electrode folders.
The described oval core polarization maintaining optical fibre of the upper winding of piezoelectric ceramics PZT.
On described voltage sensor head, be wound around oval core polarization maintaining optical fibre.
Described narrow-band light source device wavelength is 980nm.
Described narrow-band light source device output light source phase range is 0～180 °.
Compared with prior art, the beneficial effects of the utility model are:
The interference of two low order linear polarization intermodes that the utility model utilization is transmitted in a polarization maintaining optical fibre realizes sensing measurement, reject the impact of light source fluctuation on system accuracy, ensure the sensitivity of measuring system, compare with conventional interference type optical fiber sensor that to have Installation and Debugging simple, ensure steady operation and other merits.
Brief description of the drawings
Fig. 1 is the full Fiber-Optic Voltage composition frame chart of monolateral lobe intermode interference formula.
Fig. 2 is monolateral lobe intermode interference output light source and phase difference φ=0 o'clock graph of a relation.
Graph of a relation when Fig. 3 is monolateral lobe intermode interference output light source and phase difference φ=60 °.
Graph of a relation when Fig. 4 is monolateral lobe intermode interference output light source and phase difference φ=90 °.
Graph of a relation when Fig. 5 is monolateral lobe intermode interference output light source and phase difference φ=120 °.
Graph of a relation when Fig. 6 is monolateral lobe intermode interference output light source and phase difference φ=180 °.
Fig. 7 is the relation between normalized phase contant and the normalized frequency of several patterns in polarization maintaining optical fibre.
The oval core polarization maintaining optical fibre 7-voltage sensor head 8-multimode optical fiber 9-photodetector two 10-signals collecting of 1-narrow-band light source device 2-single-mode fiber 3-1 × 2 fiber coupler 4-fibre optic polarizer 5-piezoelectric ceramics PZT 6-and treating apparatus 11-photodetector one 12-off-axis weld
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is further illustrated:
As shown in Figure 1, interferential full optical-fiber voltage transformer (VT) between a kind of monolateral lobe, comprise narrow-band light source device 1, single-mode fiber 2, 1 × 2 fiber coupler 3, fibre optic polarizer 4, piezoelectric ceramics PZT, 5 oval core polarization maintaining optical fibres 6, voltage sensor head 7, multimode optical fiber 8, photodetector 29, signals collecting and treating apparatus 10, photodetector 1, described narrow-band light source device 1 is connected with 1 × 2 fiber coupler 3 by single-mode fiber 2, 1 × 23 one of fiber couplers output terminal is connected with fibre optic polarizer 4 by single-mode fiber 2, fibre optic polarizer 4 is connected with piezoelectric ceramics PZT5, piezoelectric ceramics PZT5 output terminal is connected with voltage sensor head 7 input ends by oval core polarization maintaining optical fibre 6, voltage sensor head 7 output terminals are connected to oval core polarization maintaining optical fibre 6 by oval core polarization maintaining optical fibre 6 and are connected multimode optical fiber with the off-axis weld 12 of multimode optical fiber 8 again, multimode optical fiber 8 is connected with photo-detector 29 signals collecting and treating apparatus 10, a part of output terminal of signals collecting and treating apparatus 10 is connected with piezoelectric ceramics PZT5,
1 × 2 described fiber coupler 3 another output terminals are connected with photodetector 1 by single-mode fiber 2, photodetector 1 is connected with signals collecting and processing 10 devices, and signals collecting and treating apparatus 10 another part output terminals complete digital output and analog output.
Described voltage sensor head 7 is made up of two reguline metal quartz crystal cylinders of aluminium electrode therebetween.
The described oval core polarization maintaining optical fibre 6 of the upper winding of piezoelectric ceramics PZT5.
On described voltage sensor head 7, be wound around oval core polarization maintaining optical fibre 6.
Described narrow-band light source device 1 wavelength is 980nm.
Described narrow-band light source device 1 output light source phase range is 0～180 °.
Principle of work:
The light being sent by laser of narrowband 1 enters 1 × 2 fiber coupler 3 after single-mode fiber 2 transmits, export Guang mono-tunnel from 1 × 2 coupling mechanism 1 and be transferred to signals collecting and treating apparatus 10 carries out opto-electronic conversion through single-mode fiber 2, as with reference to signal in order to reject the impact of light source fluctuation on system accuracy in the time that signal is processed, another Lu Guangjing single-mode fiber 2 of exporting from 1 × 2 coupling mechanism 3 and fibre optic polarizer 4, enter oval core polarization maintaining optical fibre (PMF) 6 for sensing by piezoelectric ceramics 5, in oval core polarization maintaining optical fibre 6, the light of transmission is when through voltage sensor head 7, two low-order mode LP
01and LP
e 11intermode phase differential can be subject to tested high-tension modulation, and then change the distribution of intermode interference output intensity, the intensity distribution variation of this intermode interference output is extracted by the method for multimode optical fiber 8 and oval core polarization maintaining optical fibre 6 off-axis weldings, after the opto-electronic conversion of photodetector 29, sending into signals collecting and treating apparatus 10 realizes tested high-tension demodulation again, signals collecting and a part of simulating signal for the treatment of apparatus 10 are transferred in piezoelectric ceramics PZT5 again by electrical lead, object is by multimode optical fiber 8, the requirement of what the simulating signal that photodetector 29 transmits had do not meet standard transmission signal, so these signals are returned in electroceramics PZT5, again by above-mentioned identical order transmission primaries again, choose optimum signal as final digital output and analog output.
Piezoelectric ceramics PZT5 (PbZrTio
3) being wound around a part of oval core polarization maintaining optical fibre 6, it is poor that its effect is that the control voltage by adjusting piezoelectric ceramics PZT5 is adjusted static phase between two patterns of transmission in oval core polarization maintaining optical fibre 6.Voltage sensor head 7 is made up of a quartz crystal cylinder that has been wound around oval core polarization maintaining optical fibre 6 of two metal aluminium electrode folders, quartz crystal cylinder is according to certain cut direction processing, under the effect of external electric field, quartz crystal can radially deformation occur because of inverse piezoelectric effect be gone forward side by side and modulates polarization maintaining optical fibre length, utilizes the inverse piezoelectric effect of quartz crystal to modulate the intermode phase differential of polarization maintaining optical fibre; The method of multimode optical fiber 8 and oval core polarization maintaining optical fibre 6 off-axis weldings is extracted in the intensity sidelobe utilization of a variation of intermode interference output, and the separation of the current employing wave plate formula of replacement connects, and realizes the full fiberize of whole light path part.
Fig. 2～Fig. 6 is monolateral lobe intermode interference output light source and phase differential graph of a relation, reflects the situation of change of monolateral lobe intermode interference output light source in from 0 to 180 °, phase place.Intermode interference is the interference between different mode in optical fiber, and one adopts two patterns of lowest-order in optical fiber to realize intermode interference, exceedes two multiple-mode interfences between pattern and interferes the complicacy of output form because of it and be difficult to use in Fibre Optical Sensor.In order to transmit two low step modes and realize stable intermode interference in optical fiber, except need to reasonably selecting, the operation wavelength of light source, also to need to select suitable optical fiber.General communication is difficult to be really applied in the design of intermode interference Fibre Optical Sensor because of topic between the degeneracy characteristic of its same order pattern and Mode Coupling with circle core step-refraction index single-mode fiber.
According to theory of fiber, in weakly guiding optical fiber, the pattern of transmission light can represent with linear polarization mould, can be expressed as LP from low to high according to the exponent number of mould
01, LP
e 11(LP
11even mould) and LP
0 11(LP
11strange mould) etc.Oval core polarization maintaining optical fibre is because of the singularity of its structure, second-order linearity polarization mode LP
e 11and LP
0 11unlike being degeneracy at circle in core fibre, but it is poor to have larger propagation constant, and this makes can in wider wavelength coverage, realize first-order linear polarization mode LP in polarization maintaining optical fibre
01with second-order linearity polarization mode LP
e 11transmission, and second order pattern LP
0 11can be cut off.Taking oval core polarization maintaining optical fibre as example, by reasonably selecting operation wavelength, can make can only transmit in optical fiber: LP
01and LP
e 112 patterns, LP
0 11and higher pattern is cut off.Suppose the only Gauss light beam of propagating in optical fiber, it is peaked that Wx and Wy are that Gauss light beam becomes in luminous power
time x and y direction radius, LP
01mould and LP
e 11electric field intensity can be expressed as follows respectively:
Z in formula
0for the plane wave impedance in vacuum; n
1for fiber core refractive index; X, y are cartesian coordinate system parameters.Suppose to have equal energy and identical polarization direction from 2 patterns of optical fiber outgoing, outgoing interference light intensity can be expressed as
In formula, I is for interfering output intensity;
lP
01the electric field function of mould;
lP
e 11the electric field function of mould; Δ φ=Δ β Δ L is the phase differential after two patterns are propagated in optical fiber, wherein Δ β=β LP
01-β LP
e 11be that two propagation constants between pattern are poor, Δ L is the length variations after fiber lengths is modulated.Fig. 2～6 are for carrying out interfering in different Δ φ situations after numerical evaluation the distribution situation of output intensity according to formula (1)～(3).
From Fig. 2～6, can find out, along with the variation of phase difference φ between two patterns, interfere the phenomenon that exists energy exchange between two sidelobes exporting.Being phase differential changes to pi/2 again to the process of π from 0, has completed the exchange of primary energy from a sidelobe to another sidelobe, and simulation result shows that the process that phase differential changes to 2 π from π is also similar.If can, to interfering one (or two) in two sidelobes exporting to survey, just can change and obtain two phase differential between pattern from the light intensity detecting, and then realize the sensing measurement of the physical quantity to causing the variation of intermode phase differential.
In order to ensure and can only to transmit two low order linear polarization mould LP in oval core polarization maintaining optical fibre
01and LP
e 11, need to select operation wavelength according to optical fiber structure Rational Parameters.Oval its fiber core refractive index of core polarization maintaining optical fibre n that the utility model is selected
1=1.470, cladding index n
2=1.456, fibre core major axis radius a=3 μ m, minor axis radius b=1 μ m.The propagation characteristic that obtains its several low-order modes through simulation calculation as shown in Figure 7.In Fig. 7, horizontal ordinate is normalized frequency
wherein
enter for optical wavelength, ordinate is normalized phase contant
here select centre wavelength be the narrow band laser of 980nm as light source (V=3.45), as can be seen from Figure 7, now in this optical fiber, can only transmit LP
01and LP
e 11two patterns, and propagation constant between these two patterns is poor also larger, is conducive to ensure the sensitivity of measuring system.
Claims (6)
1. interferential full optical-fiber voltage transformer (VT) between a monolateral lobe, comprise narrow-band light source device, single-mode fiber, 1 × 2 fiber coupler, fibre optic polarizer, piezoelectric ceramics PZT, oval core polarization maintaining optical fibre, voltage sensor head, multimode optical fiber, photodetector one, photodetector two, signals collecting and treating apparatus, it is characterized in that, described narrow-band light source device is connected with 1 × 2 fiber coupler by single-mode fiber, 1 × 2 one of fiber coupler output terminal is connected with fibre optic polarizer by single-mode fiber, fibre optic polarizer is connected with piezoelectric ceramics PZT, piezoelectric ceramics PZT output terminal is connected with voltage sensor head input end by oval core polarization maintaining optical fibre, voltage sensor head output terminal is connected to oval core polarization maintaining optical fibre by oval core polarization maintaining optical fibre and is connected multimode optical fiber with the off-axis weld of multimode optical fiber again, multimode optical fiber and photo-detector two, signals collecting and treating apparatus connect, a part of output terminal of signals collecting and treating apparatus is connected with piezoelectric ceramics PZT,
Described another output terminal of 1 × 2 fiber coupler is connected with photodetector one by single-mode fiber, photodetector one is connected with signals collecting and treating apparatus, and signals collecting and treating apparatus another part output terminal complete digital output and analog output.
2. interferential full optical-fiber voltage transformer (VT) between the monolateral lobe of one according to claim 1, is characterized in that, described voltage sensor head is made up of two reguline metal quartz crystal cylinders of aluminium electrode therebetween.
3. interferential full optical-fiber voltage transformer (VT) between the monolateral lobe of one according to claim 1, is characterized in that, the described oval core polarization maintaining optical fibre of the upper winding of piezoelectric ceramics PZT.
4. according to interferential full optical-fiber voltage transformer (VT) between the monolateral lobe of the one described in claim 1 or 3, it is characterized in that, on described voltage sensor head, be wound around oval core polarization maintaining optical fibre.
5. interferential full optical-fiber voltage transformer (VT) between the monolateral lobe of one according to claim 1, is characterized in that, described narrow-band light source device wavelength is 980nm.
6. interferential full optical-fiber voltage transformer (VT) between the monolateral lobe of one according to claim 1, is characterized in that, described narrow-band light source device output light source phase range is 0～180 °.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632180A (en) * | 2017-09-21 | 2018-01-26 | 天津博科光电科技有限公司 | A kind of optical-fibre voltage sensing probe and optical-fibre voltage sensing demodulating system |
| CN109001517A (en) * | 2018-05-02 | 2018-12-14 | 上海大学 | It is a kind of based on all -fiber voltage sensing device for mixing manganese silica fibre |
| CN110133352A (en) * | 2019-05-10 | 2019-08-16 | 上海大学 | All -fiber voltage sensing device based on thermal poling silica fibre |
| CN110174547A (en) * | 2019-06-20 | 2019-08-27 | 东北电力大学 | A kind of inverse piezoelectric type optical fibre voltage sensor |
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2014
- 2014-07-15 CN CN201420391161.3U patent/CN204008794U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632180A (en) * | 2017-09-21 | 2018-01-26 | 天津博科光电科技有限公司 | A kind of optical-fibre voltage sensing probe and optical-fibre voltage sensing demodulating system |
| CN109001517A (en) * | 2018-05-02 | 2018-12-14 | 上海大学 | It is a kind of based on all -fiber voltage sensing device for mixing manganese silica fibre |
| CN109001517B (en) * | 2018-05-02 | 2021-04-09 | 上海大学 | All-fiber voltage sensing device based on manganese-doped quartz fiber |
| CN110133352A (en) * | 2019-05-10 | 2019-08-16 | 上海大学 | All -fiber voltage sensing device based on thermal poling silica fibre |
| CN110174547A (en) * | 2019-06-20 | 2019-08-27 | 东北电力大学 | A kind of inverse piezoelectric type optical fibre voltage sensor |
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