CN205246857U - Fiber optic current sensor bandwidth test system - Google Patents
Fiber optic current sensor bandwidth test system Download PDFInfo
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- CN205246857U CN205246857U CN201521074714.3U CN201521074714U CN205246857U CN 205246857 U CN205246857 U CN 205246857U CN 201521074714 U CN201521074714 U CN 201521074714U CN 205246857 U CN205246857 U CN 205246857U
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Abstract
The utility model discloses a fiber optic current sensor bandwidth test system, including modulation frequency voltage controller, fiber optic current sensor closed loop signal processing system and bandwidth analytic unit. The utility model discloses start with from fiber optic current sensor closed loop signal processing process, introduce simulation modulation phase place at the signal processing in -process, simulate the optics nonreciprocity faraday phase place that the power line electric current causes under the different frequency, test fiber optic current sensor's bandwidth. Through exerting the bandwidth magnitude of voltage, measure the current output under the different frequency voltage input, avoided carrying on the test of loaded down with trivial details procedure on current transformer bandwidth test platform, realized accomplishing fiber optic current sensor bandwidth's test based on compensation phase control signal.
Description
Technical field
The utility model relates to power measurement technical field, is specifically related to a kind of fibre optic current sensor frequency bandwidth test beSystem.
Background technology
Fibre optic current sensor is the optical interdferometer being based upon on Faraday magnetooptical effect basis. At present, both at home and abroad at lightFiber current sensor signal processing aspect, all adopts digital closed loop signal processing technology. As seen from Figure 1, optical fiber electricityFlow sensor digital closed-loop system is mainly by light source, coupler 1, polarizer 2, phase-modulator 3, λ/4 wave plate, PINPhotodetector, fiber optic loop, speculum and signal processing unit composition. Signal detection and processing procedure are as follows: light source is sent outThe light going out is risen partially by polarizer after coupler, forms linearly polarized light; Linearly polarized light is converted into left-handed and circle dextrorotationPolarised light, enters sensing fiber ring; In sensing fiber ring, because transmission current produces magnetic field Faraday effect, two bundles are roundPolarised light, with different speed transmission, has produced faraday's phase shift; Again by after the wave plate of λ/4, extensive via sensor fibreBe linearly polarized light again, and interfere at polarizer place, interfere light wave to enter PIN photoelectric detector through coupler. PINPhotoelectric detector detects after the variation of interference signal light intensity, sends into signal processing unit, forms closed loop feedback voltage signal and adjustsPhase-modulator processed, makes phase-modulator in fiber optic loop, apply nonreciprocal feedback compensation phase shift, this feedback compensation phase shiftFaraday's phase shift equal and opposite in direction, opposite direction with foreign current causes, make fibre optic current sensor closed-loop system work all the timeDo near phase place zero point. Signal processing unit is by obtaining the size of this compensating phase shift, and through scale factor, conversion drawsThrough the current magnitude information of fibre optic current sensor.
Fibre optic current sensor has wide dynamic range, good insulation preformance, certainty of measurement advantages of higher, can meet electric energyThe technical need in the fields such as metering, relay protection and control. Frequency bandwidth is the important performance of fibre optic current sensor, frequency bandWidth has important impact to the acting characteristic of relay protection, harmonic measure, transient measuring, particularly current differential protection.The frequency bandwidth of test analysis fibre optic current sensor is assessment fibre optic current sensor precision, dynamic characteristic and reliabilityImportant evidence. In existing fibre optic current sensor frequency bandwidth test process, need the special strong current generator that is equipped with,The device such as frequency characteristic analyzer, tester, adopts special transformer frequency bandwidth to demarcate environment, this test conventionallyMode somewhat expensive, test process is loaded down with trivial details, efficiency is lower, is badly in need of a kind of rapid and simple fibre optic current sensor bandwidthDegree test macro.
Utility model content
A kind of fibre optic current sensor frequency bandwidth test macro is provided in the utility model embodiment, existing to solveThe problem that method of testing is consuming time and cost is higher.
In order to solve the problems of the technologies described above, the utility model embodiment discloses following technical scheme:
A kind of fibre optic current sensor frequency bandwidth test macro, comprises modulating frequency voltage controller, fiber-optic current sensorDevice closed signal treatment system and frequency bandwidth analytic unit;
Described fibre optic current sensor closed signal treatment system comprises tested optical fiber current sensor, phase-modulator and lightElectric signal processing unit, the photodetector of described Photoelectric Signal Processing unit and described tested optical fiber current sensor is electrically connectedConnect, described phase-modulator is connected electrically between the polarizer and wave plate of described tested optical fiber current sensor, and with describedThe electrical connection of Photoelectric Signal Processing unit;
Described Photoelectric Signal Processing unit is all electrically connected with described modulating frequency voltage controller and frequency bandwidth analytic unit,Described modulating frequency voltage controller is electrically connected with described frequency bandwidth analytic unit.
Preferably, in above-mentioned fibre optic current sensor frequency bandwidth test macro, described Photoelectric Signal Processing unit comprisesVoltage signal input block and current signal output unit, described voltage signal input block and the control of described modulating frequency voltageDevice electrical connection processed, described current signal output unit is electrically connected with described frequency bandwidth analytic unit.
Preferably, in above-mentioned fibre optic current sensor frequency bandwidth test macro, described modulating frequency voltage controllerVoltage range is for being less than or equal to 12mV.
The work of the fibre optic current sensor frequency bandwidth test macro that as seen from the above technical solution, the utility model providesProcess is: by external modulating frequency voltage controller, under different frequency voltage, utilize Photoelectric Signal Processing unit pairPhase-modulator applies different analog voltages, makes it produce different phase modulations to tested sensor, in this modulationUnder phase place, be equivalent to exist in tested sensor a certain optical signal different from original light source signal, Photoelectric Signal Processing listThis optical signal is converted to current signal by unit. The numeral of said process all fours and existing fibre optic current sensor is closedThe course of work of loop systems, above-mentioned current signal can embody the response performance of tested sensor to different frequency voltage. OnState current signal and export frequency bandwidth analytic unit to through Photoelectric Signal Processing unit, and frequency bandwidth analytic unit alsoIn real time receiver voltage value, thus the relation between described output voltage and described output current by analysis, described in obtainingThe frequency bandwidth of tested optical fiber current sensor. Specifically, if be linear direct ratio between the voltage and current in certain momentRelation, illustrates within the scope of this power frequency, and sensor can normal induction electric current, if exceeded or lower than a certainAfter voltage to frequency, the output current recording cannot keep the linear relationship with voltage, cannot respond so with regard to representative sensorThis voltage to frequency, i.e. the frequency bandwidth of sensor transmission current signal has arrived maximum or minimum of a value.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below will be to embodiment orIn description of the Prior Art, the accompanying drawing of required use is briefly described, apparently, and for ordinary skill peopleMember, is not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of existing fibre optic current sensor digital closed-loop system;
The structural representation of a kind of fibre optic current sensor frequency bandwidth test macro that Fig. 2 provides for the utility model embodimentFigure;
Wherein: 1-coupler, 2-polarizer, 3-phase-modulator, 4-Photoelectric Signal Processing unit, 401-current signalOutput unit, 402-voltage signal input block, 5-frequency bandwidth analytic unit, 6-modulating frequency voltage controller.
Detailed description of the invention
In order to make those skilled in the art person understand better the technical scheme in the utility model, below in conjunction with this practicalityAccompanying drawing in new embodiment, is clearly and completely described the technical scheme in the utility model embodiment, obviously,Described embodiment is only the utility model part embodiment, instead of whole embodiment. New based on this practicalityEmbodiment in type, those of ordinary skill in the art are not making the every other reality obtaining under creative work prerequisiteExecute example, all should belong to the scope of the utility model protection.
The operation principle of fibre optic current sensor is, in the time of outside this current sensor of carrying object process, in current sensorPortion can produce induced-current, and proportional between this induced-current and outer carrier electric current. Frequency bandwidth claims again necessary bandWide, refer to speed and the required frequency bandwidth feasible value taking of quality for ensureing certain transmitting information. For fibre-optic currentThe frequency bandwidth of sensor can be understood as the frequency range of the outside current-carrying that can induce.
The general principle of fibre optic current sensor is based upon on Magnet-Optic Faraday Effect basis exactly, and current field causes optical fiberIn two-beam ripple produce optical path difference, and then draw magneto-optic faraday phase place Φ S correspondingly:
ΦS＝(4NM)*Iout(1)
Wherein, ΦSFor the Faraday effect phase difference that current field causes, N is the optical fiber number of turn, and M is the German number of Wei Er,IoutFor power line current amount, the parameters such as optical fiber number of turn N, the German number of Wei Er are definite value, therefore, and current transformer defeatedGo out phase shift phiSWith foreign current amount IoutBe directly proportional.
Please refer to Fig. 1, this figure is the structural representation of existing fibre optic current sensor digital closed-loop system, as shown in the figure,The optical interference signal that photodetector detects is:
I＝I0[1+cos(ΦS+Φf+ΦJ)](2)
Through opto-electronic conversion, the voltage signal of output is M=KI0[1+cos(ΦS+Φf+ΦJ)], wherein, K is that photoelectricity turnsChange coefficient, ΦSFor current signal produces nonreciprocal phase shift, ΦS＝(4NM)Iout，IoutFor foreign current, ΦfFor square wave producesRaw biasing nonreciprocal phase shift, for improving the sensitivity of signal detection and differentiating the sense of current, ΦJFor staircase waveform produces non-mutualEasily phase shift, N is the optical fiber number of turn, M is the German number of Wei Er.
It is ± the biasing phase place of pi/2 that staircase waveform increment is used for compensating outside magneto-optic that square-wave signal produces phase shift in positive-negative half-cycleFaraday's phase shift, after square wave and staircase waveform modulation signal all add phase-modulator, what in current transformer, produce is non-Reciprocal phase shift is ΔΦ=ΦS+Φf+ΦJ, at the positive half cycle of square wave, Φf=pi/2, the output signal of interferometer is:
M1＝KI0[1-sin(ΦS+ΦJ)](3)
At the negative half period of square wave, Φf=-pi/2, the output signal of interferometer is:
M2＝KI0[1+sin(ΦS+ΦJ)](4)
Positive square wave half cycle signal (3) and negative half-cycle signal (4) are subtracted each other and can be obtained:
ΔM＝-2KI0sin(ΦS+ΦJ)(5)
Make Φ by closed loop feedbackS＝-ΦJEnsure Δ M=0, and in the time of Δ M ≠ 0, just go control with Δ M as controlled quentity controlled variableClosed loop feedback staircase generator processed, changes the voltage increment that staircase waveform produces in incremental stages, this voltage increment and light wavePhase shift phiJProportional, make all the time Φ by closed loop feedback controlS+ΦJ=0, in the time that digital closed loop reaches balance, rankThe ladder height increment of ladder ripple is directly proportional with measured electric current, and staircase waveform height gain is defeated with regard to corresponding fibre optic current sensorThe current signal going out. Ideally, by closed loop feedback control, the interference signal that photodetector detects is zero electricityFlat. In a word, fibre optic current sensor utilizes Magnet-Optic Faraday Effect exactly, by light beam in fiber optic loop is carried out to phase place solutionAdjust, so-called demodulation just refers to the nonreciprocal phase shift Φ that finds to produce with foreign current signalSEqual and opposite in direction, opposite directionCompensation of phase ΦJ, and then by obtaining the size of this compensating phase shift, draw the induced-current size of Fibre Optical Sensor inside,Through scale factor, conversion draws the foreign current amount I by fibre optic current sensor againoutValue.
It is known that closed loop feedback based on above-mentioned predicts the principle of outside current-carrying size, as long as add in fibre optic current sensorControl voltage, be equivalent at different Fibre Optical Sensor external memory at foreign current. Same control Control of Voltage just can produce sameOne simulation differs, but the faradic size producing for different fibre optic current sensors is different. Therefore,Above-mentioned closed-loop feedback manner is done to reverse engineer, if the frequency of the foreign current by this sensor is known, controlVoltage can be designed as the voltage of given frequency, can predict the frequency bandwidth to different fibre optic current sensors.
Please refer to Fig. 2, a kind of fibre optic current sensor frequency bandwidth that Fig. 2 provides for the utility model embodiment is tested and isThe structural representation of system. As shown in the figure, comprise modulating frequency voltage controller 6, fibre optic current sensor closed signal placeReason system and frequency bandwidth analytic unit 5. Described fibre optic current sensor closed signal treatment system comprises tested optical fiber electricityFlow sensor, phase-modulator and 3 Photoelectric Signal Processing unit 4, described Photoelectric Signal Processing unit 4 is with described testedThe photodetector electrical connection of fibre optic current sensor, described phase-modulator 3 is connected electrically in described tested optical fiber electric current and passesBetween the polarizer 2 and wave plate of sensor, and be electrically connected with described Photoelectric Signal Processing unit 4. Described Photoelectric Signal ProcessingUnit 4 is all electrically connected with described modulating frequency voltage controller 6 and frequency bandwidth analytic unit 5.
Modulating frequency voltage controller 6 will input to the voltage M of Photoelectric Signal Processing unit according to certain frequency adjustmentIOC。Be equivalent to introduce nonreciprocal optical phase Φ in the optical loop at sensorIOC, wherein MIOC:≤12mV. In phase placeΦ within the scope of modulator controllable voltageIOCWith voltage MIOCBetween linear:
ΦIOC＝KIOC*MIOC(6)
Wherein, KIOCFor fixed proportion constant, the phase-modulator 3 in IOC representative graph 2.
In the utility model, in the time that the electric current of wire that fibre optic current sensor is surveyed is zero, namely work as ΦSIt is 1 o'clock.Due to factors such as external magnetic fields, fibre optic current sensor fiber optic loop still can sense that initial faraday's phase place is Φ0，Corresponding initial current is I0, in phase-modulator 3, apply voltage M by modulating frequency voltage controller 6IOC, at lightLearn in loop and added additional phase modulation ΦC, now total non-reciprocal phase Φ in fiber optic loopTFor:
ΦT＝Φ0+ΦC(7)
Wherein, ΦTThe non-reciprocal phase Φ that similar existing digital closed-loop system peripheral current signal producesS。Φ0For perseveranceDefinite value, by measuring Φ under different frequency voltage input conditionT, in conjunction with existing fibre optic current sensor closed loop feedback systemSignal processing, can draw following relation:
ΦJ＝-ΦT(8)
ΦJCompensation of phase in similar existing digital closed-loop system. And ΦJ＝(4NM)Iout，IoutIn the utility modelRepresent a certain voltage to frequency MIOCThe output current of lower correspondence.
Therefore, can draw:
MIOC＝-[(4NM)Iout+Φ0]/KIOC(9)
Modulating frequency voltage controller 6 applies voltage M in phase modulation device 3IOCExport with tested optical fiber current sensorElectric current linear, according to this principle, can apply frequency bandwidth magnitude of voltage, measure the electricity under different frequency inputStream output, has avoided carrying out the test of complicated procedures on current transformer frequency bandwidth test platform, has realized based on benefitRepay phase control signal and complete the test of fibre optic current sensor frequency bandwidth.
The course of work that illustrates the test macro that the utility model provides below in conjunction with Fig. 2, comprises the following steps:
The first step, judges whether by the foreign current of tested optical fiber current sensor be zero, if so, carries out followingStep.
The object of this step is to be zero by the foreign current that ensures tested sensor, so in this case, and above-mentioned formula(9) I inout, could embody the characteristic of tested sensor self completely, the frequency bandwidth that test macro draws isHaving removed foreign current disturbs.
Second step, the initial output voltage values that described modulating frequency voltage controller 6 is set is zero, obtains described by photometryThe initial output current of fiber current sensor.
Can remember that initial voltage is M0, initial output current is I0。
The 3rd step, changes the output voltage of described modulating frequency voltage controller 6 and fibre-optic current described in Real-time ObtainingThe output current of sensor.
The output voltage sequence of modulating frequency voltage controller 6 is designated as to Mn, the corresponding output of tested optical fiber current sensorCurrent sequence is designated as In, at MnAct on phase place by the voltage signal input block 402 in Photoelectric Signal Processing unit 4After modulator 3, at phase-modulator, 3 places form phase modulation, through photodetector, then at the photoelectricity shown in Fig. 2In signal processing unit 4, be converted to current signal, form output current series In, this output current sequence NnFrom current signalOutput unit 401 exports in frequency bandwidth analytic unit 5, and modulating frequency voltage controller 6 divides with frequency bandwidthAnalyse unit 5 and be electrically connected, so output voltage sequence MnCan be sent to too frequency bandwidth analytic unit 5.
Finally, according to the relation of analyzing between described output voltage and described output current, obtain described tested optical fiber electric currentThe frequency bandwidth of sensor.
In band width analytic unit 5, synchronously enroll tested optical fiber current sensor electric current output data sequence InWithAnd modulation voltage output sequence Mn; Two groups of data sequences are removed respectively to initial value, form new data sequence Ii＝(In-I0)，Mi＝(Mn-M0); If corresponding Ii、MiLinear, illustrate at IiUnder power frequency, tested sensor is passableNormal work, completes the frequency bandwidth to measuring fiber current sensor with this.
Wherein, the 3rd step specifically refers to:
By changing the output voltage of modulating frequency voltage controller 6, control Photoelectric Signal Processing unit 4 and be applied to phase3 analog voltage in the modulator of position;
By controlling described analog voltage, change the phase modulation of phase-modulator 3 to tested optical fiber current sensor;
By controlling described phase modulation, change the output current of described tested optical fiber current sensor.
Visible by foregoing, the utility model is started with from fibre optic current sensor closed signal processing procedure, at signalIn processing procedure, introduce analog-modulated phase place, simulate the optics nonreciprocity farad that under different frequency, power line current causesPhase place, the frequency bandwidth of measuring fiber current sensor. By applying frequency bandwidth magnitude of voltage, measure different frequency electricityPress the electric current output under input, avoided carrying out the test of complicated procedures on current transformer frequency bandwidth test platform,Realize the test that completes fibre optic current sensor frequency bandwidth based on compensation of phase control signal.
The utility model can be described in the general context of computer executable instructions, for example journeyOrder module. Usually, program module comprise the routine, program carrying out particular task or realize particular abstract data type,Object, assembly, data structure etc. Also can in DCE, put into practice the utility model, in these distributionsIn formula computing environment, executed the task by the teleprocessing equipment being connected by communication network. At Distributed Calculation ringIn border, program module can be arranged in the local and remote computer-readable storage medium including memory device.
The above is only detailed description of the invention of the present utility model, makes those skilled in the art can understand or realize this realityWith novel. To be apparent to one skilled in the art to the multiple amendment of these embodiment, institute hereinThe General Principle of definition can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet with disclosed hereinThe widest scope that principle and features of novelty are consistent.
The above is only detailed description of the invention of the present utility model, it should be pointed out that the ordinary skill for the artPersonnel, not departing under the prerequisite of the utility model principle, can also make some improvements and modifications, these improvementAlso should be considered as protection domain of the present utility model with retouching.
Claims (3)
1. a fibre optic current sensor frequency bandwidth test macro, is characterized in that, comprises modulating frequency voltage controller, lightFiber current sensor closed signal treatment system and frequency bandwidth analytic unit;
Described fibre optic current sensor closed signal treatment system comprises tested optical fiber current sensor, phase-modulator and optical telecommunicationsNumber processing unit, described Photoelectric Signal Processing unit is electrically connected with the photodetector of described tested optical fiber current sensor, described inPhase-modulator is connected electrically between the polarizer and wave plate of described tested optical fiber current sensor, and with described Photoelectric Signal ProcessingUnit electrical connection;
Described Photoelectric Signal Processing unit is all electrically connected with described modulating frequency voltage controller and frequency bandwidth analytic unit; DescribedModulating frequency voltage controller is electrically connected with described frequency bandwidth analytic unit.
2. fibre optic current sensor frequency bandwidth test macro according to claim 1, is characterized in that described optical telecommunicationsNumber processing unit comprises voltage signal input block and current signal output unit, described voltage signal input block and described modulationThe electrical connection of voltage to frequency controller, described current signal output unit is electrically connected with described frequency bandwidth analytic unit.
3. fibre optic current sensor frequency bandwidth test macro according to claim 1, is characterized in that, described modulation frequentlyThe voltage range of rate voltage controller is for being less than or equal to 12mV.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467345A (en) * | 2015-12-22 | 2016-04-06 | 云南电网有限责任公司电力科学研究院 | Fiber current sensor frequency band width test method and system |
| CN110988435A (en) * | 2019-11-29 | 2020-04-10 | 中国人民解放军92942部队 | Optical path system for improving signal-to-noise ratio of optical fiber current sensor |
| CN111123186A (en) * | 2019-12-20 | 2020-05-08 | 中国电力科学研究院有限公司 | Device and method for testing broadband characteristics of optical fiber current sensor |
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2015
- 2015-12-22 CN CN201521074714.3U patent/CN205246857U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467345A (en) * | 2015-12-22 | 2016-04-06 | 云南电网有限责任公司电力科学研究院 | Fiber current sensor frequency band width test method and system |
| CN110988435A (en) * | 2019-11-29 | 2020-04-10 | 中国人民解放军92942部队 | Optical path system for improving signal-to-noise ratio of optical fiber current sensor |
| CN111123186A (en) * | 2019-12-20 | 2020-05-08 | 中国电力科学研究院有限公司 | Device and method for testing broadband characteristics of optical fiber current sensor |
| CN111123186B (en) * | 2019-12-20 | 2023-05-09 | 中国电力科学研究院有限公司 | Device and method for testing broadband characteristics of optical fiber current sensor |
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