CN102590608A - Environment temperature compensation heavy current measurement system based on fiber polarization detection - Google Patents
Environment temperature compensation heavy current measurement system based on fiber polarization detection Download PDFInfo
- Publication number
- CN102590608A CN102590608A CN2012100544764A CN201210054476A CN102590608A CN 102590608 A CN102590608 A CN 102590608A CN 2012100544764 A CN2012100544764 A CN 2012100544764A CN 201210054476 A CN201210054476 A CN 201210054476A CN 102590608 A CN102590608 A CN 102590608A
- Authority
- CN
- China
- Prior art keywords
- polarization
- optical fiber
- optical
- fiber
- measurement system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention relates to an environment temperature compensation heavy current measurement system based on fiber polarization detection. Through carrying out real-time measurement on environment temperature, setting a polarization controller, and inputting an optical signal and a temperature signal in the polarization controller simultaneously, a temperature change signal is compensated in the polarization controller, thus the optical signal always maintains linear polarization at a controller output terminal (a fiber which detects current), influence of temperature change on polarization change of light is avoided, influence of the temperature change on a current detection result is avoided, and measurement accuracy of the system is raised. According to the invention, a structure is simple, a requirement of an insulation device is not high, compared with a traditional test system, a dimension becomes smaller, and cost is low. A magneto-optical effect principle is employed, thus a dynamic scope is very large, reaction rate is high, and a non-saturation test of heavy current can be realized. By employing the fiber as a sensor, long distance transmission of data can be realized, and security is raised greatly.
Description
Technical field
The present invention relates to a kind of power network current detection technique, particularly a kind of ambient temperature compensation Super-Current Measurement system that detects based on the optical fiber polarisation attitude.
Background technology
Intelligent grid is a strategic notion that relates to many technical fields, and the development intelligent grid must be that means, equipment and technology are that support, control technology are that method, supporting technology are guiding with the measuring technique.Wherein electric current is the important parameter that intelligent grid need detect, and current sensor also just becomes one of most important instrument in the intelligent grid, and big current detection technology is the key that realizes intelligent grid.Big current detecting system is used the Faraday effect of optical fiber, because Faraday effect, electric current produces magnetic field, and magnetic field is the polarisation-affecting attitude again, and instrument obtains tested current value through polarization state is detected.Because temperature is difficult to avoid and compensate to the influence that detects electric current based on the optical fiber polarisation attitude, the optical fiber type current transformer still is difficult to form in batches and large-scale production so far yet all the time.
Summary of the invention
The present invention be directed to temperature in the big current detecting system and the influence that detects electric current based on the optical fiber polarisation attitude is difficult to the problem avoiding and compensate; A kind of ambient temperature compensation Super-Current Measurement system that detects based on the optical fiber polarisation attitude has been proposed; Through environment temperature is measured in real time; And through Polarization Controller is set, simultaneously input optical signal and temperature signal in Polarization Controller; In Polarization Controller, the temperature variation signal is compensated, thereby make light signal remain linear polarization state, thereby avoided temperature variation polarization state of light to be changed the influence that produces at controller output end (detecting the optical fiber of electric current); Thereby also just avoided the influence of temperature variation to the current detecting result, improved the accuracy of measurement of system.
Technical scheme of the present invention is: a kind of ambient temperature compensation Super-Current Measurement system that detects based on the optical fiber polarisation attitude, and magneto-optical crystal places the traverse side that is connected with big electric current, LASER Light Source; Circulator, Polarization Controller, magneto-optical crystal; Fiber reflector links to each other with polarization maintaining optical fibre successively; Optical fiber polarisation attitude detector send single-chip microcomputer through the real-time polarization attitude variable quantity of Fibre Optical Sensor module measuring optical fiber, and temperature sensor test environment temperature is sent A/D converter in the single-chip microcomputer, and Polarization Controller send single-chip microcomputer with the polarisation of light amount that records; After the single-chip microcomputer processing signals, the output polarization compensation rate is sent to sensor fibre through Polarization Controller.
Described LASER Light Source can be selected the LASER Light Source of 1550nm or 1310nm for use; Described circulator can be selected three hole circulators for use, and described fiber reflector is selected the optical fiber of FC-NPC interface for use.
Beneficial effect of the present invention is: the present invention is based on the ambient temperature compensation Super-Current Measurement system that the optical fiber polarisation attitude detects; Simple in structure; So this instrument transducing part applied optics principle is to the less demanding of device that insulate, traditional relatively test macro size decreases, cost step-down; Because this instrument has been abandoned electromagnetic core, adopt the magneto-optic effect principle, so dynamic range is very big, reaction rate is high, can realize the unsaturation test of big electric current; Adopt optical fiber can realize the long-distance transmissions of data as sensor, security is greatly improved; Adopt Polarization Controller that polarization state of light is implemented control, in polarization control system, compensate simultaneously, avoided Influence of Temperature fully before sensor fibre detects electric current thereby light signal is arrived to Influence of Temperature.
Description of drawings
Fig. 1 the present invention is based on optical fiber polarisation current sensing system schematic diagram in the ambient temperature compensation Super-Current Measurement system that the optical fiber polarisation attitude detects;
Fig. 2 the present invention is based on the ambient temperature compensation Super-Current Measurement system architecture synoptic diagram that the optical fiber polarisation attitude detects;
Fig. 3 the present invention is based on the ambient temperature compensation Super-Current Measurement system hardware connection synoptic diagram that the optical fiber polarisation attitude detects;
Fig. 4 the present invention is based on the ambient temperature compensation Super-Current Measurement system software process flow diagram that the optical fiber polarisation attitude detects.
Embodiment
Optical fiber polarisation current sensing system schematic diagram as shown in Figure 1, under the effect in magnetic field, the material that did not have optical activity has originally also produced this phenomenon of optical activity (light vector rotates) and has been called magnetic rotation effect or Faraday effect.Rotating vector
=
; If the material optical activity is ρ, then
=
.When the light path of light through material does
lThe time, the rotation angle of light polarization face
For:
=
L=
L=V
L, V=here
, V is called Verdet constant, and is relevant with Substance Properties, temperature and light frequency (wavelength), and physical significance is the rotation angle of per unit light path per unit field intensity.
When linearly polarized light passes through magneto-optic memory technique; Its plane of polarization will rotate under the magnetic field effect that electric current produces; The anglec of rotation
is proportional to magnetic field H along the line integral of linearly polarized light by material path:
V
Have by circuital law:
V
=VNI, through surveying the variation that the linearly polarized light deflection angle comes probe current.Electric current is directly proportional with
angle, measures
angle and can obtain electric current I.Above-mentioned is exactly the theoretical foundation of system works according to the invention.
The outstanding advantage of patent of the present invention is: under normal circumstances, and can be by the automatic feedback environment temperature of computer software to the influence of light in the Optical Fiber Transmission polarization state; When system's generation unusual condition, also can carry out manual operation.Also have the computer monitoring function simultaneously, show setting value, the actual value of current controlled volume, the output of controlled quentity controlled variable.
The ambient temperature compensation Super-Current Measurement system architecture synoptic diagram that detects based on the optical fiber polarisation attitude as shown in Figure 2 comprises LASER Light Source 1, circulator 2, Polarization Controller 3, Fibre Optical Sensor 4, central control chip 5, magneto-optical crystal 7, fiber reflector 6.Described LASER Light Source 1, circulator 2, Polarization Controller 3, magneto-optical crystal 7, fiber reflector 6 usefulness polarization maintaining optical fibres link to each other successively.During practical implementation, described LASER Light Source can be selected the LASER Light Source of 1550nm or 1310nm for use; Described circulator can be selected three hole circulators for use, and described fiber reflector is selected the optical fiber of FC-NPC interface for use.
System hardware as shown in Figure 3 connects synoptic diagram; The MCU single-chip microcomputer is as central control chip 5; Optical fiber polarisation attitude detector 11 changes through the real-time polarization attitude of Fibre Optical Sensor module 4 measuring optical fiber, send central die 5, and temperature compensation property NTC thermistor is as temperature sensor 9; A/D converter in temperature sensor 9 and the single-chip microcomputer 5 constitutes input channel, is used for the ambient temperature signal of collecting test.This moment, Polarization Controller 3 directly was sent to central control chip 5 with the polarisation of light amount that records.The light polarization amount of this moment is mainly produced by the influence of variation of ambient temperature; Calculate the side-play amount of the polarization state that temperature variation causes in view of the above; Again by central control chip procedure auto-control polarization state compensation rate; Signal after will compensating again through Polarization Controller 3 is sent to Fibre Optical Sensor module 4, thereby makes the optical fiber polarisation attitude before the input sensor fibre, offset Influence of Temperature fully.Low-tension supply 10 is temperature sensor 9, central die 5, Polarization Controller 3,11 power supplies of polarization state detector.
The course of work of the said system of patent of the present invention is: Polarization Controller 3 is linked to each other with central control chip, through software control adjustment polarization state, make the output polarization state of light be in the highest position of polarization state changing sensitivity.Magneto-optical crystal 7 is placed near the lead that is connected with big electric current.Monitor polarization state in real time through central control chip, realize the detection of the electric current in the lead.Like Fig. 4 is the software flow pattern of system according to the invention.Program begins the polarization state of first detection laser, and detection system temperature of living in compensates temperature variation through algorithm then, and output polarization attitude detected value calculates current value at last again.
In the practical application, the single-mode fiber cross section since processing technology to cause can not be desirable proper circle, but certain ovality and shape distortion are arranged; On the other hand; The material of drawing optical fiber also is difficult to guarantee to be desirable with uniformly on vertical and horizontal; Thereby cause the material coefficient of thermal expansion coefficient inhomogeneous; Under the different environment temperature, can appear different laterally, vertical internal stress, this just makes that existing certain pattern lotus root between two intrinsic polarization modes
and
of optical fiber closes.The normalization birefringence parameter of single-mode fiber
reflects this Mode Coupling degree:
; In the formula:
is the refractive index of pattern
, and
is the refractive index of pattern
.
The phenomenon of this intrinsic mode refractive index is called as intrinsic birefringence effect in the optical fiber; Weigh with
Mathematic(al) representation by the phase temperatures characteristic of single-mode fiber:
Can get:
So have:
Again because
, so:
Relation according to temperature and single-mode fiber output light-wave polarization state; Just can be by the variation of central control chip software programming according to temperature variation control optical fiber polarisation attitude; It is stabilized near a certain value, thereby reaches automatic control and the purpose of monitoring the optical fiber polarization state.
A/D converter in temperature sensor 9 and the single-chip microcomputer 5 constitutes input channel, is used for the ambient temperature signal of collecting test.Temperature sensor 9 outputs signal to central die 5.This moment, optical fiber polarization controller 3 directly was sent to central control chip with the optical fiber polarisation amount that records.The optical fiber polarisation amount of this moment is mainly produced by the influence of variation of ambient temperature; Calculate the side-play amount of the optical fiber polarisation attitude that temperature variation causes in view of the above; Again by central control chip software controlled polarization state compensation rate; Signal after will compensating again is sent to sensor fibre 4, thereby makes the optical fiber polarisation attitude before the input sensor fibre, offset Influence of Temperature fully.
After this, because the magneto-optic Faraday effect, change in current produces the variation in magnetic field; The variation in magnetic field acts on the optical fiber, makes the output polarization state of light squint, and the Polarization Detection device is imported central controller with signal; Central controller is measured change in current through executing the variation of lentor vector.
Claims (2)
1. an ambient temperature compensation Super-Current Measurement system that detects based on the optical fiber polarisation attitude is characterized in that magneto-optical crystal places the traverse side that is connected with big electric current; LASER Light Source, circulator, Polarization Controller; Magneto-optical crystal, fiber reflector links to each other with polarization maintaining optical fibre successively, and optical fiber polarisation attitude detector send single-chip microcomputer through the real-time polarization attitude variable quantity of Fibre Optical Sensor module measuring optical fiber; Temperature sensor test environment temperature is sent A/D converter in the single-chip microcomputer; Polarization Controller send single-chip microcomputer with the polarisation of light amount that records, and after the single-chip microcomputer processing signals, the output polarization compensation rate is sent to sensor fibre through Polarization Controller.
2. according to the said ambient temperature compensation Super-Current Measurement system that detects based on the optical fiber polarisation attitude of claim 1, it is characterized in that described LASER Light Source can be selected the LASER Light Source of 1550nm or 1310nm for use; Described circulator can be selected three hole circulators for use, and described fiber reflector is selected the optical fiber of FC-NPC interface for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100544764A CN102590608A (en) | 2012-03-05 | 2012-03-05 | Environment temperature compensation heavy current measurement system based on fiber polarization detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100544764A CN102590608A (en) | 2012-03-05 | 2012-03-05 | Environment temperature compensation heavy current measurement system based on fiber polarization detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102590608A true CN102590608A (en) | 2012-07-18 |
Family
ID=46479531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100544764A Pending CN102590608A (en) | 2012-03-05 | 2012-03-05 | Environment temperature compensation heavy current measurement system based on fiber polarization detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102590608A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995166A (en) * | 2014-04-29 | 2014-08-20 | 国家电网公司 | Temperature-compensated optical current measurement module and temperature-compensated optical current transformer |
| CN105300531A (en) * | 2014-05-30 | 2016-02-03 | 中国计量学院 | Novel wavemeter on the basis of magnetic rotation effect |
| CN111308158A (en) * | 2020-03-31 | 2020-06-19 | 国网山东省电力公司济南供电公司 | Near-electric induction system of power transmission line |
| CN112986650A (en) * | 2021-01-20 | 2021-06-18 | 河南平高电气股份有限公司 | All-fiber current transformer and temperature compensation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201047859Y (en) * | 2007-05-24 | 2008-04-16 | 湾世伟 | Full optical fiber reflection type great current optical current mutual inductor |
| CN101692401A (en) * | 2009-09-04 | 2010-04-07 | 北京齐瑞得电力技术有限公司 | Optical fiber current transformer with optical fiber temperature acquisition and temperature compensation |
| WO2011125564A1 (en) * | 2010-03-31 | 2011-10-13 | 東京電力株式会社 | Optical fiber current sensor and electric current measurement method |
| CN202522620U (en) * | 2012-03-05 | 2012-11-07 | 上海理工大学 | Ambient temperature compensation large current measurement system based on optical fiber polarization state detection |
-
2012
- 2012-03-05 CN CN2012100544764A patent/CN102590608A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201047859Y (en) * | 2007-05-24 | 2008-04-16 | 湾世伟 | Full optical fiber reflection type great current optical current mutual inductor |
| CN101692401A (en) * | 2009-09-04 | 2010-04-07 | 北京齐瑞得电力技术有限公司 | Optical fiber current transformer with optical fiber temperature acquisition and temperature compensation |
| WO2011125564A1 (en) * | 2010-03-31 | 2011-10-13 | 東京電力株式会社 | Optical fiber current sensor and electric current measurement method |
| CN202522620U (en) * | 2012-03-05 | 2012-11-07 | 上海理工大学 | Ambient temperature compensation large current measurement system based on optical fiber polarization state detection |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995166A (en) * | 2014-04-29 | 2014-08-20 | 国家电网公司 | Temperature-compensated optical current measurement module and temperature-compensated optical current transformer |
| CN105300531A (en) * | 2014-05-30 | 2016-02-03 | 中国计量学院 | Novel wavemeter on the basis of magnetic rotation effect |
| CN111308158A (en) * | 2020-03-31 | 2020-06-19 | 国网山东省电力公司济南供电公司 | Near-electric induction system of power transmission line |
| CN112986650A (en) * | 2021-01-20 | 2021-06-18 | 河南平高电气股份有限公司 | All-fiber current transformer and temperature compensation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101339093B (en) | Optical fiber ring quality measurement method and its device for optical fibre gyroscope | |
| CN101441129B (en) | Optical fiber ring performance measuring and evaluating system based on temperature experiment | |
| CN102495260B (en) | Temperature drift compensation optical current transformer and current compensation method thereof | |
| CN102954869B (en) | A kind of polarization maintaining optical fibre High Extinction Ratio calibrating installation and calibration steps thereof | |
| CN102033147B (en) | Method for manufacturing a fiber optic current sensor with inherent temperature compensation of the faraday effect | |
| CN107797080A (en) | The apparatus and method of Hall sensor calibration demarcation are realized using NMR equipment | |
| CN102261965B (en) | Temperature sensing method and device based on double-core optical fiber | |
| CN102590608A (en) | Environment temperature compensation heavy current measurement system based on fiber polarization detection | |
| CN108982975A (en) | A kind of electric field detector | |
| CN106802190A (en) | A kind of highly sensitive optic fibre turning sensor without Temperature cross-over interference | |
| CN108106817B (en) | Method for improving polarization performance measurement accuracy of Y waveguide device | |
| CN114137273B (en) | Temperature-sensitive current eliminating sensing device of FBG cascade optical fiber composite structure | |
| CN202522620U (en) | Ambient temperature compensation large current measurement system based on optical fiber polarization state detection | |
| CN103674893A (en) | Experimental apparatus for researching relations between refractive index of magnetic fluid and temperature and magnetic field | |
| CN104076180B (en) | Dual probe-based calibration-free optical current sensor and method | |
| CN101788639A (en) | APD (Angular position digitizer) voltage and temperature curve testing device and use method thereof | |
| CN107179431A (en) | The optical fiber current sensing device and its method measured in real time based on birefringence | |
| CN105955342B (en) | A kind of high stable length standard optical fiber | |
| CN204439814U (en) | Microwave ferromagnetic resonance experimental system | |
| CN102261978B (en) | Method and device for implementing hydraulic pressure sensing based on twin-core and twin-hole optical fiber | |
| CN103196655B (en) | A kind of polarization maintaining optical fibre Verdet constant measuring apparatus and method | |
| CN105157952B (en) | A kind of system and method for measuring the average birefringence of polarization maintaining optical fibre and its temperature coefficient | |
| CN104049230A (en) | System and method for testing frequency response characteristic of optical fiber current transformer | |
| CN207992311U (en) | A kind of solenoid type optics small electric current sensor with temperature-compensating | |
| CN106443519A (en) | Measurement system and method for detecting magnetic field intensity using magnetic optical isolator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120718 |