CN103207318A - Quasi-reciprocal optical closed-loop lithium niobate optical waveguide alternating electric field/voltage sensor - Google Patents
Quasi-reciprocal optical closed-loop lithium niobate optical waveguide alternating electric field/voltage sensor Download PDFInfo
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Abstract
The invention provides a quasi-reciprocal optical closed-loop lithium niobate optical waveguide alternating electric field/voltage sensor. The quasi-reciprocal optical closed-loop lithium niobate optical waveguide alternating electric field/voltage sensor comprises a light source, a circulator, a polarizer, a phase modulator, a polarization-maintaining time delay optical fiber, a measuring optical path, a compensating optical path, a photodiode, a signal processing and light source driving circuit and a signal outputting and control interface. A polarization-maintaining optical fiber polarization shaft between the polarizer and the phase modulator is subjected to 45-degree counter-shaft fusion welding, a lithium niobate straight waveguide sensing unit of the measuring optical path and a compensating optical fiber of the compensating optical path are subjected to 90-degree counter-shaft coupling. Two cross-polarization modes participating in interference are interchanged when passing through the optical paths back and forth for two times and have the same optical path length, and a quasi-reciprocal reflection-type optical path for optical fiber conduction and waveguide sensing is formed. The quasi-reciprocal optical closed-loop lithium niobate optical waveguide alternating electric field/voltage sensor utilizes Pockels electrooptical effect of a lithium niobate crystal to modulate optical phases, achieves electric field/voltage measurement, has high sensitivity and measurement accuracy, can effectively separate components of direct current and alternating current of measured voltage and decrease a optical path space and is easily produced in a large-scale mode.
Description
Technical field
The invention belongs to the optical sensing technical field, be specifically related to a kind of accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor.
Background technology
Electric system is the lifeblood of national economy, and electric-field sensor and voltage sensor are one of fundamental measurement equipment that carries out in the electric system electric energy metrical and relay protection, its accuracy and reliability and electric system safe, reliable, economical operation is closely related.Increase along with electrical production, electrical power transmission system capacity; the Operating Voltage grade is also more and more higher; digitizing, intellectuality and networking at aspects such as monitoring, control and protections require to improve constantly, and traditional electromagnetic type electric-field sensor and voltage sensor are because its inherent shortcoming can not satisfy the power system development demand.Digital optical electric field sensor and optical voltage sensor be with its superior performance and tangible economic and social benefit, for guaranteeing huge and complicated day by day power system security reliability service, and improves its intelligent degree and have profound significance.
At present, the voltage sensor of widespread use is electromagnetic sensor and capacitance-voltage-distributing type sensor in the electric system.Along with the raising of China's Operating Voltage grade, problem such as traditional existing magnetic saturation of being made up of iron core of electromagnetic potential sensor, ferromagnetic resonance is exposed gradually.Therefore, in middle and high piezoelectric forces system, the capacitance-voltage-distributing type sensor that traditional electromagnetic sensor is progressively had anti-ferroresonance, cost performance advantages of higher replaces, but the transient response of capacitance-voltage-distributing type sensor is relatively poor, electric capacity is connected with nonlinear compensation inductance, transformer inductance, equipment itself has the possibility that ferroresonance takes place, and can threaten device security to move reliably.In addition, electromagnetic sensor and capacitance-voltage-distributing type sensor exist response speed low simultaneously, and frequency band is narrow, and burning and explosion danger are arranged, simulating signal output, and follow-up signal is handled problems such as complexity.
Developing rapidly along with optical technology in recent years, optical electric field sensor and voltage sensor based on optical fiber sensing technology develop rapidly, it can effectively overcome traditional electromagnetic sensor and the intrinsic defective of capacitance-voltage-distributing type sensor, has good insulating, bandwidth, response is fast, there is not magnetic saturation in no iron core, no ferroresonance, not because of oil-filled and potential danger such as inflammable, explosive, advantages such as digital quantity output.Present optical voltage sensor can be divided into bulk crystals type optical voltage sensor and integrated optics type voltage sensor according to its sensitive element.As the sensitive element measuring voltage, its precision height, but light channel structure complexity are difficult for installing bulk crystals type optical voltage sensor with block electro-optic crystal, and volume is bigger, is difficult for large-scale production.The sensing unit of integrated optics type voltage sensor is the optical waveguide of being made by lithographic technique, so the sensitivity of this voltage sensor is higher, light path is simple, volume is little, but its temperature stability is relatively poor, it is bigger influenced by direct current biasing, and the waveguide half-wave voltage is lower, can't measure the high pressure of hundreds of kilovolt.
At present, research about integrated optics type voltage sensor launches research already at home and abroad, but mainly concentrate on Mach-Zehnder (Mach-Zehnder) interfere type optical voltage sensor (document [1]: B.Culshaw, J.Dakin. Fibre Optical Sensor. Li Shaohui, Ning Yanong. Wuhan: publishing house of HUST, 1997:5-10).The measuring principle of this type of sensor is the Mach-Zehnder interferometer, and sensitive element is titanium diffusion lithium niobate (LiNbO
3) optical waveguide of substrate, responsive principle of electric field is the bubble Ke Ersi effect of crystal.Lithium columbate crystal is tangentially cut Y biography type for X in the waveguide.When tested voltage is added on the electrode of sensor, the direction of an electric field that is added on Mach-Zehnder interferometer two arms is opposite, when light during by waveguide, bubble Ke Ersi electrooptical effect all takes place on every arm, produce equal and opposite in direction and the opposite phase shift of direction, therefore, can know the size of tested voltage by phase shift difference by inference.Though Mach-Zender integrated optics voltage sensor volume is little, in light weight, simple in structure, easy to make, have plurality of advantages, but Y passes lithium niobate electric-field sensor electrooptical coefficient and biasing is very responsive to temperature because X cuts, so the temperature stability of this type of optical voltage sensor is very poor, can not be operated under the full temperature environment, be difficult in electric system, be used.
Before this, Japanese scholar (document [2]: Ogawa O. is arranged, Sowa T., Ichizono S.A guided-wave optical electric field sensor with improved temperature stability.Journal of Lightwave Technology, 1999,17 (5): 823-830.) proposed a kind of straight wave guide of using as the integrated optics electric-field sensor of sensing head.As shown in Figure 2, the electric field-sensitive element of this optical electric field sensor is that Y cuts Z biography TE (transverse electric wave) and TM (transverse magnetic wave) mould interfere type titanium diffusion lithium niobate base straight wave guide, have only a light-path in the waveguide, responsive principle of electric field is bubble Ke Ersi (Pockels) electrooptical effect of crystal.Though existing Y cuts lithium niobate straight wave guide type optical electric field sensor temperature stability and improves a lot than Mach-Zender, but its TE and the intrinsic biasing of TM mould of measuring electric field result and waveguide have very big correlativity, waveguide TE and the same temperature influence of the intrinsic biasing of TM mould, so its same temperature influence of electric field-sensitive coefficient, therefore this kind electric-field sensor can not be isolated electric field or the voltage of alternation accurately and effectively in actual measurement, has limited its application.
Summary of the invention
The present invention is big for light channel structure complexity, the volume that solves existing optical electric field sensor and voltage sensor and exist, be difficult for problems such as large-scale production, temperature stability difference and intrinsic biasing temperature influence, improve sensitivity and the stability of voltage measurement, a kind of accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor is provided.
Accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor of the present invention comprises: light source, circulator, the polarizer, phase-modulator, the inclined to one side time delay optical fiber of guarantor, measurement light path, compensation light path, photodiode, signal processing and light source driving circuit and signal output and control interface; Wherein, measuring light path comprises Faraday polarization apparatus, measures light path optical fiber and lithium niobate straight wave guide sensing unit; The compensation light path comprises compensated optical fiber and catoptron; In actual measurement, measure light path and place tested electric field with the compensation light path.
The polarized light that light source sends arrives the polarizer through circulator, becomes linearly polarized light behind the polarizer; Polarization maintaining optical fibre polarization axle between the polarizer and the phase-modulator with 45 ° to the polarization maintaining optical fibre polarization axle of axle welding or the polarizer with 45 ° directly and phase-modulator axle is coupled, linearly polarized light is divided into the light signal with two orthogonal polarization modes, after phase-modulator is modulated the phase place of light signal, the pairwise orthogonal polarization mode of light signal enters Faraday polarization apparatus respectively after the fast and slow axis transmission of protecting inclined to one side time delay optical fiber, through Faraday polarization apparatus, the pairwise orthogonal polarization mode of light signal rotates 45 ° respectively, incide lithium niobate straight wave guide sensing unit through measuring light path optical fiber again, behind lithium niobate straight wave guide sensing unit, incide compensated optical fiber, lithium niobate straight wave guide sensing unit and compensated optical fiber polarization axle are coupled to axle with 90 °, light signal is returned by mirror reflects along compensated optical fiber transmission back, the light signal that reflects is again by lithium niobate straight wave guide sensing unit, pass through Faraday polarization apparatus again through measuring light path optical fiber, the pairwise orthogonal polarization mode of light signal rotates 45 ° simultaneously again, the pairwise orthogonal polarization mode emission of light signal is exchanged, the pairwise orthogonal polarization mode of light signal is successively after protecting inclined to one side time delay optical fiber and phase-modulator after exchanging, the place interferes at the polarizer, the interference signal that generates is transferred to photodiode by circulator and carries out opto-electronic conversion, and the electrical signal converted input signal is handled and light source driving circuit; Signal is handled and light source driving circuit is handled the electric signal of input, by the signal output signal relevant with electric field level with control interface output.
Between the polarizer and the phase-modulator, between phase-modulator and the inclined to one side time delay optical fiber of guarantor and protect inclined to one side time delay optical fiber and measure between the light path, the optical fiber that adopts is polarization maintaining optical fibre, protects inclined to one side time delay optical fiber, measures light path optical fiber and compensated optical fiber also is polarization maintaining optical fibre.
Advantage and the good effect of optical waveguide alternating electric field/voltage sensor of the present invention are:
(1) utilizes the bubble Ke Ersi electrooptical effect of lithium columbate crystal as the principle of responsive electric field, can realize higher sensitivity and measuring accuracy;
(2) use fiber waveguide device as sensing unit but not bulk crystals has significantly reduced optical path space, be convenient to transportation and install, be easy to large-scale production;
(3) optical waveguide is used Y to cut lithium columbate crystal substrate that Z passes to replace X commonly used to cut Y passing substrate, improved the temperature stability of waveguide greatly;
(4) adopt the reflective measurement structure of accurate reciprocity, improved the precision of electric field/voltage measurement, significantly improve the antijamming capability of environmental factors such as sensor for temperature, vibration;
(5) use the complete-digital closed-loop signal processing method of optical fibre gyro, advantage such as it is big to have dynamic range, and the linearity is good can be extracted the alternating current-direct current component of signal easily, electric field/voltage measurement and waveguide is setovered have nothing to do.
Description of drawings
Fig. 1 is Mach-Zender integrated optics voltage sensor measuring principle figure;
Fig. 2 is existing straight wave guide integrated optics electric-field sensor measuring principle figure;
Fig. 3 is voltage sensitive element waveguiding structure synoptic diagram of the present invention
Fig. 4 is the one-piece construction synoptic diagram of electric field/voltage sensor of the present invention.
Among the figure:
The 1-light source; The 2-circulator; The 3-polarizer; The 4-phase-modulator; 5-protects inclined to one side time delay optical fiber; The 6-Faraday polarization apparatus;
7-measures light path optical fiber; 8-lithium niobate straight wave guide sensing unit; The 9-compensated optical fiber; The 10-catoptron; The 11-photodiode;
The 12-signal is handled and light source driving circuit; The output of 13-signal and control interface.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
At existing bulk crystals type optical electric field sensor and voltage sensor light channel structure complexity, problem such as be difficult for installing, volume is big, it is poor to solve at present common integrated optics electric-field sensor and voltage sensor temperature stability simultaneously, be subjected to direct current biasing to influence problems such as bigger, the invention provides a kind of accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor.The inventive method adopts the complete-digital closed-loop negative feedback to detect, has bigger dynamic range, the better linearity degree, adopt digital filtering technique simultaneously, the effective alternating current-direct current signal in the separation signal, conveniently carry out the measurement of temperature compensation and alternating electric field/voltage, signal is detected efficiently and controls.
The principle of closed loop detection scheme is: introduce the staircase waveform feedback on the basis of square-wave frequency modulation, between the pairwise orthogonal linear polarized beams of participate in interfering, introduce one poor with Pockels phase shift 2 δ equal and opposite in directions, direction opposite phases, be used for offsetting the Pockels phase shift, system is always worked near the zero phase, improved detection sensitivity and the dynamic range of system.
As shown in Figure 4, accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor provided by the invention comprises as lower member: light source 1, circulator 2, the polarizer 3, phase-modulator 4, the inclined to one side time delay optical fiber 5 of guarantor, measurement light path, compensation light path, photodiode 11, signal processing and light source driving circuit 12, signal output and control interface 13.Wherein, measuring light path comprises Faraday polarization apparatus 6, measures light path optical fiber 7 and lithium niobate straight wave guide sensing unit 8; The compensation light path comprises compensated optical fiber 9 and catoptron 10.In actual measurement, measure light path and place tested electric field with the compensation light path.
Between the polarizer 3 and the phase-modulator 4, between phase-modulator 4 and the inclined to one side time delay optical fiber 5 of guarantor, protect between inclined to one side time delay optical fiber 5 and the measurement light path, the optical fiber that adopts is necessary for polarization maintaining optical fibre, protects inclined to one side time delay optical fiber 5, measurement light path optical fiber 7 and compensated optical fiber 9 and also is necessary for polarization maintaining optical fibre.
Lithium niobate straight wave guide sensing unit 8 adopts the Y based on the titanium diffusion technique to cut Z and passes the lithium niobate base straight wave guide, structure as shown in Figure 3, cutting Z with Y, to pass lithium niobate be substrate, waveguide is made by the titanium diffusion technique, waveguide is made by the titanium diffusion technique; Waveguide is the straight wave guide of a path, the waveguide two ends directly and optical fiber be coupled, measure the polarization axle of light path optical fiber 7 and the polarization axle of waveguide axle is coupled, the polarization axle that the polarization axle of compensated optical fiber 9 and waveguide are fast is coupled to axle with 90 °, and sensing unit is directly exported with optical fiber.The waveguide both sides of existing straight wave guide electric-field sensor as shown in Figure 2 enter the light signal of waveguide and output waveguide by the polarizer and analyzer control, and its light signal only transmits along a direction in waveguide.Owing to the existence of catoptron 10, light comes transmission back in waveguide, removed the polarizer and analyzer simultaneously among the present invention, and entire device directly by optical fiber output, improves a lot to stability of layout.
Measure the light path of light path optical fiber 7 and lithium niobate straight wave guide sensing unit 8 birefringence differences generation and the equivalent optical path that compensated optical fiber 9 produces, to realize the reciprocity of light path.
Protect inclined to one side time delay optical fiber 5 and be the polarization maintaining optical fibre between 150～300 meters of the segment length, effect is that light path is produced certain time-delay, makes up the rational light transit time, is beneficial to follow-up signal and handles.
The partial poolarized light that light source 1 sends arrives the polarizer 3 through circulator 2, becomes linearly polarized light behind the polarizer 3.Polarization maintaining optical fibre polarization axle between the polarizer 3 and the phase-modulator 4 with 45 ° to the polarization maintaining optical fibre polarization axle of axle welding or the polarizer with 45 ° directly and phase-modulator axle is coupled, then linearly polarized light is divided into the light signal with two orthogonal polarization modes.After the phase place of 4 pairs of light signals of process phase-modulator was modulated, the pairwise orthogonal polarization mode of light signal entered Faraday polarization apparatus 6 respectively after the fast and slow axis transmission of protecting inclined to one side time delay optical fiber 5.Through Faraday polarization apparatus 6, the pairwise orthogonal polarization mode of light signal rotates 45 ° respectively, incide lithium niobate straight wave guide sensing unit 8 through measuring light path optical fiber 7 again, behind lithium niobate straight wave guide sensing unit 8, incide compensated optical fiber 9, because lithium niobate straight wave guide sensing unit 8 is coupled to axle with 90 ° with compensated optical fiber 9, so the light signal fast and slow axis of this moment exchanges, the signal of measuring in the light path optical fiber 7 is compensated.Last optical signals catoptron 10 reflects, and again by lithium niobate straight wave guide sensing unit 8, bubble Ke Ersi phase shift is doubled.Back light passes through Faraday polarization apparatus 6 again, the pairwise orthogonal polarization mode rotates 45 ° simultaneously again, the pairwise orthogonal polarization mode of light signal of this moment is compared during with incident, emergence pattern exchanges, the pairwise orthogonal polarization mode of light signal is through protecting inclined to one side time delay optical fiber 5 after exchanging, phase-modulator 4 backs interfere at the polarizer 3 places, interference signal is transferred to photodiode 11 by circulator 2 and carries out opto-electronic conversion, entering signal processing afterwards and light source driving circuit 12 carry out signal to be handled, signal is handled and light source driving circuit 12 is added to the phase shift of light signal generating that makes on the phase-modulator 4 in the light path according to present voltage of signal(l)ing condition generation on the one hand, offset differing that the pairwise orthogonal polarized light produces in the light path, output and the signal of pairwise orthogonal polarized light phase difference correlation is on the other hand exported to computing machine or other equipment by signal output and control interface 13.
Measure the Y that adopts in the light path based on the titanium diffusion technique and cut Z biography lithium niobate base straight wave guide as the electric field-sensitive element, utilize the responsive extra electric field of its bubble Ke Ersi electrooptical effect, realize electric field/voltage measurement.The compensation light path is terminal to form reflective structure by catoptron 10, and electrooptical effect is doubled when making light signal again by the measurement light path, is the twice of transmission-type, has improved the sensitivity of electric field/voltage measurement.Adopt two sections identical polarization maintaining optical fibre transmitting optical signals in measuring light path and compensating light path.The compensation light path is carried out 90 ° to the axle coupling with the output terminal of measuring the terminal lithium niobate straight wave guide of light path, and orthogonal polarization mode exchanges, and can eliminate the phase error that is caused by electric field in the Transmission Fibers thus.
Because the introducing of nonreciprocal device Faraday polarization apparatus 6, the pairwise orthogonal polarization mode that makes participation interfere passes through the exchange of back generation transmission polarization axle round twice, change the y polarization mode when being the x polarization mode reverse transfer in forward when transmission into, change the x polarization mode during y polarization mode reverse transfer during the forward transmission into.Therefore, the pairwise orthogonal polarization mode constitutes the reflective light path of accurate reciprocity of fiber optic conduction and waveguide sensing through identical light path in the whole optical path, has improved the antijamming capability of light channel structure.
What the circuit part of total system adopted is and the similar signal processing circuit of optical fibre gyro.Comprise power drives control module and signal processing circuit in signal processing and the light source driving circuit 12, the power drives control module is used for control light source 1 and sends light signal; Signal processing circuit is carried out filtering, amplification, analog to digital conversion and mathematical operation to electric signal, solve magnitude of voltage to be measured, and send to the computing machine or other equipment that are attached thereto by signal output with control interface 13 with the form of digital signal, in addition, signal processing circuit is modulated to light signal on the sensitive position of monitoring according to current demand signal situation control phase modulator 4 at any time, make the phase shift of light signal generating in the light path, offset differing that the pairwise orthogonal polarized light produces in the light path.
For traditional electromagnetic type and capacitor voltage sensor, the present invention has very big advantage.Owing to electromagnetic type and capacitor voltage sensor self structure reason, can there be magnetic saturation, problems such as ferroresonance, and the present invention is optical system, and optical devices such as optical fiber and waveguide itself are insulators, and is not charged during system works, be not subjected to electromagnetic effect, luminous energy is faint, does not have potential safety hazard, so sensor can be used under the abominable electromagnetic environment.
Bulk crystals type optical voltage sensor need be formed optical system and complicated lens coupled system by lens, the polarizer, analyzer etc., and the light channel structure complexity is difficult for installing, and volume is bigger, is difficult for large-scale production.And transducing part of the present invention is made by optical waveguide, and transducing part is coupled into optical fibres directly, has solved many shortcomings of bulk crystals type optical voltage sensor, it is little to have volume, in light weight, simple in structure, plurality of advantages such as easy to make has higher stability.
The optical waveguide that Mach-Zender integrated optics voltage sensor is used is that X cuts Y biography type optical waveguide, and this kind sensing head temperature influence is very big, can not be applied under the full temperature environment.The electric field-sensitive element is that Y cuts Z biography type titanium diffusion lithium niobate base straight wave guide among the present invention, has only a light-path in the waveguide, and as shown in Figure 3, responsive principle of electric field is the bubble Ke Ersi effect of crystal.This kind design has solved the problems such as temperature stability difference of Mach-Zender optical voltage sensor commonly used, also the structure of optical waveguide has been done simplification simultaneously.
Existing relatively straight wave guide type optical electric field sensor the invention solves its measurement and is subjected to the waveguide biasing to influence bigger problem.Because advantages such as utilization of the present invention is the complete-digital closed-loop disposal route of ripe optical fibre gyro, and it is big to have dynamic range, and the linearity is good can conveniently adopt digital filtering technique, leach DC component and AC compounent in the signal.Wherein DC component is the biasing of waveguide, with temperature correlation, can be used for thermometric, temperature compensation etc.; AC compounent is relevant with alternating electric field/voltage, can be used for the measurement of electric field or voltage.So the present invention is owing to used the complete-digital closed-loop processing scheme, the intrinsic biasing of the measurement of alternating electric field and waveguide is irrelevant, has solved existing straight wave guide type optical electric field sensor alternating electric field and has measured the problem relevant with the intrinsic biasing of waveguide.
Claims (6)
1. accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor, it is characterized in that, comprising: light source, circulator, the polarizer, phase-modulator, the inclined to one side time delay optical fiber of guarantor, measurement light path, compensation light path, photodiode, signal processing and light source driving circuit and signal output and control interface; Wherein, measuring light path comprises Faraday polarization apparatus, measures light path optical fiber and lithium niobate straight wave guide sensing unit; The compensation light path comprises compensated optical fiber and catoptron; In actual measurement, measure light path and place tested electric field with the compensation light path;
The polarized light that light source sends arrives the polarizer through circulator, becomes linearly polarized light behind the polarizer; Polarization maintaining optical fibre polarization axle between the polarizer and the phase-modulator with 45 ° to the polarization maintaining optical fibre polarization axle of axle welding or the polarizer with 45 ° directly and phase-modulator axle is coupled, linearly polarized light is divided into the light signal with two orthogonal polarization modes afterwards, after phase-modulator is modulated the phase place of light signal, the pairwise orthogonal polarization mode of light signal enters Faraday polarization apparatus respectively after the fast and slow axis transmission of protecting inclined to one side time delay optical fiber, through Faraday polarization apparatus, the pairwise orthogonal polarization mode of light signal rotates 45 ° respectively, incide lithium niobate straight wave guide sensing unit through measuring light path optical fiber again, behind lithium niobate straight wave guide sensing unit, incide compensated optical fiber, lithium niobate straight wave guide sensing unit and compensated optical fiber polarization axle are coupled to axle with 90 °, light signal is returned by mirror reflects along compensated optical fiber transmission back, the light signal that reflects is again by lithium niobate straight wave guide sensing unit, pass through Faraday polarization apparatus again through measuring light path optical fiber, the pairwise orthogonal polarization mode of light signal rotates 45 ° simultaneously again, the pairwise orthogonal polarization mode emission of light signal is exchanged, the pairwise orthogonal polarization mode of light signal is successively after protecting inclined to one side time delay optical fiber and phase-modulator after exchanging, the place interferes at the polarizer, the interference signal that generates is transferred to photodiode by circulator and carries out opto-electronic conversion, and the electrical signal converted input signal is handled and light source driving circuit; Signal is handled and light source driving circuit is handled the electric signal of input, and result is exported by signal output and control interface;
Between the polarizer and the phase-modulator, between phase-modulator and the inclined to one side time delay optical fiber of guarantor and protect inclined to one side time delay optical fiber and measure between the light path, the optical fiber that adopts is polarization maintaining optical fibre, protects inclined to one side time delay optical fiber, measures light path optical fiber and compensated optical fiber also is polarization maintaining optical fibre.
2. accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor according to claim 1 is characterized in that, described lithium niobate straight wave guide sensing unit, and cutting Z biography lithium niobate with Y is substrate, waveguide is made by the titanium diffusion technique; Waveguide is the straight wave guide of a path, the waveguide two ends directly and optical fiber be coupled, the polarization axle of measurement light path optical fiber and the polarization axle of waveguide are coupled to axle, the polarization axle of compensated optical fiber and the polarization axle of waveguide are coupled to axle with 90 °.
3. accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor according to claim 1 and 2 is characterized in that, measures the light path of light path optical fiber and lithium niobate straight wave guide sensing unit birefringence difference generation and the equivalent optical path that compensated optical fiber produces.
4. accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor according to claim 1 and 2 is characterized in that the inclined to one side time delay optical fiber of described guarantor is the polarization maintaining optical fibre of 150～300 meters of segment length.
5. accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor according to claim 1 and 2, it is characterized in that, described signal is handled and light source driving circuit, comprise the power drives control module of sending light signal for the control light source, with the signal processing circuit that electric signal is handled, signal processing circuit carries out finding the solution voltage to be measured after filtering, amplification and the analog to digital conversion to electric signal, and the synchronous signal treatment circuit is modulated to light signal on the sensitive position of monitoring at any time according to current demand signal situation control phase modulator.
6. accurate reciprocity digital closed loop lithium niobate fiber waveguide alternating electric field/voltage sensor according to claim 1 is characterized in that, described light source adopts super-radiance light emitting diode or Er-Doped superfluorescent fiber source.
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| CN103616570A (en) * | 2013-11-13 | 2014-03-05 | 清华大学 | Self-correcting optoelectronic integration electric field sensor system |
| CN103792405A (en) * | 2014-02-24 | 2014-05-14 | 北京航空航天大学 | Micropackage quasi reciprocity reflection type optical waveguide electric field or voltage sensing head |
| CN104459350A (en) * | 2014-12-05 | 2015-03-25 | 清华大学 | Lithium niobate straight waveguide electric field measuring system |
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