CN102928680A - Electric field measurement system based on polarization compensation - Google Patents
Electric field measurement system based on polarization compensation Download PDFInfo
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- CN102928680A CN102928680A CN2012104247536A CN201210424753A CN102928680A CN 102928680 A CN102928680 A CN 102928680A CN 2012104247536 A CN2012104247536 A CN 2012104247536A CN 201210424753 A CN201210424753 A CN 201210424753A CN 102928680 A CN102928680 A CN 102928680A
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Abstract
The invention relates to an electric field measurement system based on polarization compensation and belongs to the technical field of high-voltage measurement. The electric field measurement system comprises a control unit and a measurement unit, wherein the control unit comprises a laser source, a polarization controller, a detector and a processor; and the measurement unit comprises a sensor and a polarization beam splitter. According to the electric field measurement system based on polarization compensation, the laser polarization state is compensated in real time, so that a quiescent operation point of the sensor is locked to pi/2, and the electric field sensor has optimal performance; a 1/4 wave plate is not used, and the temperature stability of the electric field measurement system is guaranteed; and moreover, according to the measurement system, the polarization state is compensated in real time, and the adverse effects of temperature, vibration and other environmental factors on electro-optical crystal and optical fiber physical properties are overcome, so that the electric field measurement system can be applied to an outdoor severe environment, and the application range and occasions of the electric field measurement system are widened.
Description
Technical field
The present invention relates to a kind of electric field measurement system based on polarization compensation, can be applicable to belong to the high voltage measuring technical field than the measuring high electric field in the rugged surroundings.
Background technology
In fields such as high-voltage engineering and nuclear engineerings, can produce very strong electric field, be electric-field sensor to it critical component of measuring, should satisfy following basic demand: wide frequency range, dynamic range is large; Spatial resolution is high, and is little etc. to former interference.It should be noted that the measurement to highfield is not limited only to laboratory environment, major applications is in outdoor environment, needs to consider the impact of the environmental factors such as temperature, vibration, requires sensor to have higher stability.
Optical electric field sensor has bandwidth, the advantages such as little is disturbed in former field, has been widely used in voltage, electric field measurement.In the prior art based on the structural representation of the electric field measurement system of optical electric field sensor as shown in Figure 1.This measuring system comprises measuring unit 101 and control module 102, lays respectively in strong electric field environment and the electromagnetic screen environment (such as the relay protection cell).The lasing light emitter 103 that is positioned at control module produces linearly polarized light, transfers to collimation lens 105 by polarization maintaining optical fibre 104, and laser transfers to electric-field sensor 108 through the polarizer 106, quarter wave plate 107 after collimation lens focuses on.Electric-field sensor adopts has the crystal of linear electro-optic effect (such as LiNbO
3Crystal, BGO crystal etc.), under the effect of external electrical field, the refractive index of crystal can change, thereby the laser that transmits in crystal is produced the polarization state modulation.Enter polarization beam apparatus 109 from the elliptical polarization signal of electric-field sensor output, the polarization state signal is converted to light intensity signal.Light intensity signal enters output single-mode fiber 111 after focusing on through collimation lens 110, transfers to the detector 112 that is positioned at control module, and light intensity signal is converted into voltage signal.Can be according to the anti-release of the transport function of measuring system electric field signal to be measured after the detectable voltage signals.
Quiescent point
Transport function to measuring system has material impact, as shown in Figure 2.When
Or during π, quiescent point is positioned at the zone of saturation of transport function, greatly reduces on the one hand the sensitivity of measuring, and makes on the other hand measured waveform produce serious distortion.When
The time, namely the polarization state of sensor Output of laser is circular polarization state, and quiescent point is positioned at the range of linearity of transport function, and measuring system has maximum sensitivity and linear input-output characteristic.Therefore, be quiescent point to the basic demand of optical electric field sensor
Equal or near pi/2.
Mainly there are two defectives in prior art: produce on the one hand the quiescent bias point of pi/2 by quarter wave plate 107, the performance of quarter wave plate is subjected to the impact of temperature very large, when temperature variation,
To depart from pi/2, have a strong impact on the temperature stability of electric-field sensor, even cause the malfunctioning of device.On the other hand, electro-optic crystal has thermoelectricity, light and the additional physical influence such as sells off, and the environmental factors such as temperature or light irradiation will acutely affect the stability of electric-field sensor, and the range of application of electric-field sensor is limited in the laboratory environment.
Summary of the invention
The objective of the invention is to propose a kind of electric field measurement system based on polarization compensation, by input laser being carried out the FEEDBACK CONTROL of polarization state, make the quiescent point of sensor be locked as pi/2, make measuring system have optimum performance, eliminate simultaneously the impact of environmental factor (temperature, vibration etc.) on measuring, make electric-field sensor be applicable to measurement than electric field in the rugged surroundings.
The electric field measurement system based on polarization compensation that the present invention proposes comprises control module and measuring unit;
Described control module comprises:
Lasing light emitter is for generation of laser;
Polarization Controller, be used for receiving the laser of self-excitation light source, laser carried out polarization state process, obtain satisfactory elliptical polarization laser, and elliptical polarization laser transferred to measuring unit by the input single-mode fiber, Polarization Controller and lasing light emitter link to each other by inputting single-mode fiber;
Detector is used for receiving the two-way light intensity signal from measuring unit, and the two-way light intensity signal is converted to respectively the two-way voltage signal, and detector links to each other by the output single-mode fiber with measuring unit;
Processor, be used for receiving the two-way voltage signal from detector, state criterion according to the circular polarization state laser of setting, the voltage signal that receives is judged, according to judging that signal sends control signal to Polarization Controller, according to voltage signal, calculate electric pulse field parameter simultaneously, processor links to each other by concentric cable with Polarization Controller with detector respectively;
Described measuring unit comprises:
Sensor is used for receiving the laser from control module, when not having electric field action, sensor is output as circular polarization state laser, electric field to be measured is modulated circular polarization state laser, obtains comprising the elliptical polarization laser of electric field information, and sensor links to each other with control module by the input single-mode fiber;
Polarization beam apparatus, the circular polarization state or the elliptical polarization laser that are used for receiving sensor output, and make the polarization state signal be converted into the two-way light intensity signal, and the input end of polarization beam apparatus links to each other with sensor, and the output terminal of polarization beam apparatus links to each other with control module by the output single-mode fiber.
The electric field measurement system based on polarization compensation that the present invention proposes, its advantage is: electric field measurement system of the present invention makes the quiescent point of sensor be locked as pi/2 by the real-Time Compensation to laser polarization state, so that electric-field sensor has optimum performance; Sensor in the measuring system no longer adopts quarter wave plate, has eliminated the impact of quarter wave plate on sensors temperature stability, has guaranteed the temperature stability of electric field measurement system; Measuring system of the present invention is by the real-Time Compensation of polarization state, overcome the harmful effect of the environmental factors such as temperature, vibration to electro-optic crystal, Optical Fiber Physical characteristic, electric field measurement system be can be applicable to outdoor than in the rugged environment, opened up range of application and the occasion of electric field measurement system.
Description of drawings
Fig. 1 is the structural representation of electric field measurement system in the prior art.
Fig. 2 is that quiescent point is on the principle schematic of the impact of the transport function of electric field measurement system.
Fig. 3 is the structural representation based on the electric field measurement system of polarization compensation that the present invention proposes.
Fig. 4 is the workflow diagram of processor in the measuring system of the present invention.
Among Fig. 1, the 101st, measuring unit, the 102nd, control module, the 103rd, lasing light emitter, the 104th, input polarization maintaining optical fibre, the 105th, input collimation lens, the 106th, the polarizer, the 107th, quarter wave plate, the 108th, sensor, the 109th, polarization beam apparatus, the 110th, output collimation lens, the 111st, output single-mode fiber, the 112nd, detector.
Among Fig. 3, the 1st, measuring unit, the 2nd, control module, the 3rd, lasing light emitter, the 4th, optical patchcord, the 5th, Polarization Controller, the 6th, input single-mode fiber, the 7th, input collimation lens, the 8th, sensor, the 9th, polarization beam apparatus, the 10th, output collimation lens, the 11st, output single-mode fiber, the 12nd, detector, the 13rd, processor, the 14th, concentric cable.
Embodiment
The electric field measurement system based on polarization compensation that the present invention proposes, its structure be as shown in Figure 3:
Measuring system comprises measuring unit 1 and control module 2;
Described control module 2 comprises:
Lasing light emitter 3 is for generation of laser;
Polarization Controller 5, be used for receiving the laser of self-excitation light source 3, laser carried out polarization state process, obtain satisfactory elliptical polarization laser, and with elliptical polarization laser by the input single-mode fiber 6 transfer to measuring unit 1, Polarization Controller 5 links to each other by optical patchcord 4 with lasing light emitter 3;
Described measuring unit 1 comprises:
Polarization beam apparatus 9, the circular polarization state or the elliptical polarization laser that are used for receiving sensor 8 outputs, and make the polarization state signal be converted into the two-way light intensity signal, the input end of polarization beam apparatus 9 links to each other with sensor 8, and the output terminal of polarization beam apparatus 9 links to each other with output single-mode fiber 11 by collimation lens 10.
Below in conjunction with Fig. 4, the principle of work based on the electric field measurement system of polarization compensation that describes that the present invention proposes in detail:
The two-way voltage signal V that processor 12 receives from detector
Out1And V
Out2, become two ways of digital signals D through after the analog to digital conversion
Out1And D
Out2
Refresh time △ t is set, and every time through △ t starts Polarization Controller 5 once.
Judge whether the sensor Output of laser is circular polarization state.At first judge D
Out1With D
Out2Ratio whether be 1, if be not 1, then carry out feedback regulation by Polarization Controller 5, until D
Out1/ D
Out2=1.The control signal that next finely tunes Polarization Controller 5 makes D
Out=D
Out1/ D
Out2, D after the fine setting Polarization Controller
OutVariable quantity be △ D
Out, judge △ D
OutRelation with threshold value δ.If △ is D
Out/ △ V
Cont〉=δ then carries out feedback regulation by Polarization Controller 5, until △ D
Out/ △ V
Cont＜δ namely finishes polarization compensation one time, and lock Polarization Controller 5 this moment, makes the sensor Output of laser remain circular polarization state.
When carrying out electric field measurement, produce trigger pip, the locking Polarization Controller is simultaneously according to two ways of digital signals D
Out1And D
Out2Calculate electric field E to be measured.
In the electric field measurement system based on polarization compensation that the present invention proposes, the laser instrument STL5411 that lasing light emitter 3 can adopt Sumimoto company to produce, its centre wavelength is 1550nm.The Polarization Controller EPC-400 that Polarization Controller 5 can adopt OZ Optics to produce, its principle belongs to the extruding optical-fiber type, has the response speed of 100Hz, can be used for the caused polarization state of the environmental factors such as compensation temperature, vibration and change.The input optical fibre 5 of connection measuring unit and control module and output optical fibre 11 can adopt to communicate by letter uses single-mode fiber, and length is 200 meters, can realize the electrical isolation of measuring junction and control end.Sensor 8 can be selected LiNbO
3Crystal is as electro-optic crystal, and its length is 10mm-40mm, and the cross section is 1cm
2-2.25cm
2Square.The material of polarization beam apparatus is chosen as BK7, and sectional dimension is identical with the sectional dimension of sensor.Probe unit 12 has a pair of photoelectric conversion module, so that light intensity signal is converted to voltage signal, can adopt the balance photo-detector PDB460C of Thorlabs company.The C6000 series that processor 13 can be selected Texas Instruments realizes the functions such as analog to digital conversion, comparer, digital signal computing simultaneously.
Claims (1)
1. the electric field measurement system based on polarization compensation is characterized in that, this measuring system comprises control module and measuring unit;
Described control module comprises:
Lasing light emitter is for generation of laser;
Polarization Controller, be used for receiving the laser of self-excitation light source, laser carried out polarization state process, obtain satisfactory elliptical polarization laser, and elliptical polarization laser transferred to measuring unit by the input single-mode fiber, Polarization Controller and lasing light emitter link to each other by inputting single-mode fiber;
Detector is used for receiving the two-way light intensity signal from measuring unit, and the two-way light intensity signal is converted to respectively the two-way voltage signal, and detector links to each other by the output single-mode fiber with measuring unit;
Processor, be used for receiving the two-way voltage signal from detector, state criterion according to the circular polarization state laser of setting, the voltage signal that receives is judged, according to judging that signal sends control signal to Polarization Controller, according to voltage signal, calculate electric pulse field parameter simultaneously, processor links to each other by concentric cable with Polarization Controller with detector respectively;
Described measuring unit comprises:
Sensor is used for receiving the laser from control module, when not having electric field action, sensor is output as circular polarization state laser, electric field to be measured is modulated circular polarization state laser, obtains comprising the elliptical polarization laser of electric field information, and sensor links to each other with control module by the input single-mode fiber;
Polarization beam apparatus, the circular polarization state or the elliptical polarization laser that are used for receiving sensor output, and make the polarization state signal be converted into the two-way light intensity signal, and the input end of polarization beam apparatus links to each other with sensor, and the output terminal of polarization beam apparatus links to each other with control module by the output single-mode fiber.
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Cited By (9)
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| CN103605005A (en) * | 2013-11-13 | 2014-02-26 | 清华大学 | A photoelectric integrated electric field measurement system based on a double-Y waveguide |
| CN103616570A (en) * | 2013-11-13 | 2014-03-05 | 清华大学 | Self-correcting optoelectronic integration electric field sensor system |
| CN104407235A (en) * | 2014-11-20 | 2015-03-11 | 中国科学院半导体研究所 | Electric field passive measurement device based on Kerr effect |
| CN105914576A (en) * | 2016-05-30 | 2016-08-31 | 深圳市创鑫激光股份有限公司 | Laser |
| CN107632211A (en) * | 2017-08-31 | 2018-01-26 | 中国电力科学研究院 | A kind of quiescent point can control photoelectric integration electric-field measuring system and method |
| CN108152582A (en) * | 2017-12-25 | 2018-06-12 | 昆明理工光智检测科技有限公司 | A kind of integrated light guide microwave signal frequency measuring system and measuring method |
| CN108387788A (en) * | 2018-01-23 | 2018-08-10 | 清华大学 | Prepare the optimal optical polarization point screening technique for integrating common path interference electric-field sensor |
| CN108982975A (en) * | 2018-07-17 | 2018-12-11 | 北京无线电计量测试研究所 | A kind of electric field detector |
| CN112198374A (en) * | 2020-09-30 | 2021-01-08 | 武汉大学 | High-frequency high-precision space electric field measurement system and method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605005A (en) * | 2013-11-13 | 2014-02-26 | 清华大学 | A photoelectric integrated electric field measurement system based on a double-Y waveguide |
| CN103616570A (en) * | 2013-11-13 | 2014-03-05 | 清华大学 | Self-correcting optoelectronic integration electric field sensor system |
| CN103605005B (en) * | 2013-11-13 | 2016-05-25 | 清华大学 | A kind of photoelectric integration electric-field measuring system based on two Y waveguides |
| CN103616570B (en) * | 2013-11-13 | 2016-08-17 | 清华大学 | A kind of self-correcting photoelectric integration electric-field sensor system |
| CN104407235A (en) * | 2014-11-20 | 2015-03-11 | 中国科学院半导体研究所 | Electric field passive measurement device based on Kerr effect |
| CN105914576A (en) * | 2016-05-30 | 2016-08-31 | 深圳市创鑫激光股份有限公司 | Laser |
| CN107632211A (en) * | 2017-08-31 | 2018-01-26 | 中国电力科学研究院 | A kind of quiescent point can control photoelectric integration electric-field measuring system and method |
| CN108152582A (en) * | 2017-12-25 | 2018-06-12 | 昆明理工光智检测科技有限公司 | A kind of integrated light guide microwave signal frequency measuring system and measuring method |
| CN108387788A (en) * | 2018-01-23 | 2018-08-10 | 清华大学 | Prepare the optimal optical polarization point screening technique for integrating common path interference electric-field sensor |
| CN108387788B (en) * | 2018-01-23 | 2020-02-07 | 清华大学 | Optimal optical bias point screening method for preparing integrated common-path interference electric field sensor |
| CN108982975A (en) * | 2018-07-17 | 2018-12-11 | 北京无线电计量测试研究所 | A kind of electric field detector |
| CN108982975B (en) * | 2018-07-17 | 2020-06-30 | 北京无线电计量测试研究所 | Electric field detector |
| CN112198374A (en) * | 2020-09-30 | 2021-01-08 | 武汉大学 | High-frequency high-precision space electric field measurement system and method |
| CN112198374B (en) * | 2020-09-30 | 2021-10-22 | 武汉大学 | High-frequency high-precision space electric field measurement system and method |
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