CN207352055U - A kind of one-channel optical fiber Current Mutual Inductance system - Google Patents
A kind of one-channel optical fiber Current Mutual Inductance system Download PDFInfo
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- CN207352055U CN207352055U CN201721209411.7U CN201721209411U CN207352055U CN 207352055 U CN207352055 U CN 207352055U CN 201721209411 U CN201721209411 U CN 201721209411U CN 207352055 U CN207352055 U CN 207352055U
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Abstract
It the utility model is related to a kind of one-channel optical fiber Current Mutual Inductance system, including wideband light source, optical circulator, faraday's speculum, sensor fibre, optical unit, photodetector, data acquisition module and host computer；The output terminal of wideband light source and the first port of optical circulator connect, and the second port of optical circulator and the A ports of optical unit connect, and the 3rd port of optical circulator is exposed；The C-terminal mouth of optical unit is connected by sensor fibre with the input terminal of faraday's speculum；The B ports of optical unit and the input terminal of photodetector connect, and photodetector output terminal is connected by data acquisition module with host computer.Beneficial effect using the above scheme is：Compared to traditional fibre-optic current mutual induction system, element needed for the system greatly reduces, and light path is simple, and can effectively eliminate that flashing is qualitative and light path in error caused by a variety of losses, improve the sensing accuracy and stability of system.
Description
Technical field
It the utility model is related to technical field of optical fiber and field of measuring technique, more particularly to a kind of one-channel optical fiber electric current is mutual
Sensing system.
Background technology
With the fast development of current China's economy, electrical equipment application field is more and more extensive, has promoted electric system
The raising of voltage and current grade, will also bring the performance requirement of higher to the detection device of electric system, especially super
Checking of great current field, the current transformer of traditional undesirable mutual electromagnetic inductance formula are difficult, easily full by the insulation that its own is exposed
With the problems such as, operating cost is high, transient response is poor, it is increasingly difficult to meet industry requirement, and all-fiber current transformator relies on it
It is easily installed, electromagnetism interference, increasingly paid attention to by power industry without the advantages that magnetic saturation effect, wide dynamic range, has
The incomparable advantage of conventional current mutual induction system.
Optical fiber sensing system has been continuously improved with the requirement of measurement accuracy since proposition, experienced a series of development,
By intensity type modulation optical fiber Current Mutual Inductance system originally to the fiber-optic current sensor with sagnac rings and reflection type interference type
The extensive appearance of technology, then the New type of current sensor based on fiber grating also begins to obtain the wide of people more by now
General concern.
The scheme that existing fibre-optic current mutual induction system is most to be used is：Linearly polarized light is divided into two beam orthogonal circular polarizations light
Transmitted in sensor fibre, when there are during magnetic field, since two beam circularly polarized lights have different spread speeds, and then it is existing to produce interference
As by the power of demodulated interferential striped come the size of probe current.However, the program is in actual implementation, polarization maintaining optical fibre
45 ° of weldings have a larger difficulty, and the angular error in fusion process can cause measurement accuracy to decline.On the other hand, it is existing
Fibre-optic current mutual induction system there are element excessively and structure excessively complexity the shortcomings of, be unfavorable for practicing.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model proposes a kind of one-channel optical fiber Current Mutual Inductance system
System, has the advantages that stable, precision is high and light path is simple.
The technical solution that the utility model solves above-mentioned technical problem is as follows：A kind of one-channel optical fiber Current Mutual Inductance system,
Including wideband light source, optical circulator, faraday's speculum, sensor fibre, optical unit, photodetector, data acquisition module
And host computer；First port, second port and the 3rd port are provided with the optical circulator, is provided with the optical unit
A ports, B ports and C-terminal mouth；
The output terminal of the wideband light source is connected with the first port of the optical circulator, the second end of the optical circulator
Mouth is connected with the A ports of the optical unit, and the 3rd port of the optical circulator is exposed；The C-terminal mouth of the optical unit leads to
The input terminal that the sensor fibre is crossed with faraday's speculum is connected；Visited with the photoelectricity B ports of the optical unit
The input terminal connection of device is surveyed, the photodetector output terminal is connected by the data acquisition module with the host computer.
Beneficial effect using the above scheme is：Compared to traditional fibre-optic current mutual induction system, element needed for the system is big
Big to reduce, light path is simple, and can effectively eliminate that flashing is qualitative and light path in error caused by a variety of losses, improve
The sensing accuracy and stability of system.
Further, the optical unit includes Faraday rotor and single axial birefringence crystal, and the single shaft is two-fold
Penetrate crystal to be connected with A ports, B ports, the Faraday rotor is connected with C-terminal mouth；
When incident light is incident to the single axial birefringence crystal from A ports, incident light is by the single axial birefringence crystal point
Into o light and e light, e light is dropped, and o light is incident to the Faraday rotor and is projected through C-terminal mouth；Incident light enters from C-terminal mouth
When being incident upon the Faraday rotor, incident light can be incident on the single axial birefringence crystal, and two-fold through the single shaft
Penetrate crystal and be divided into o light and e light, o light is projected through A ports, and e light is projected through B ports.
Further, the optical circulator includes Faraday rotor and birefringece crystal.
Further, faraday's speculum includes Faraday polarization apparatus and speculum, and incident light is revolved by faraday
On the mirror, incident light is projected after speculum reflects by Faraday polarization apparatus for incidence after light device.
Further, the sensor fibre is low-birefringence spin fiber, and the step-length of the sensor fibre is 7mm, pitch
For 3mm, 4db/km is decayed to.
Further, the ASE light sources that wavelength is 1550nm centered on the wideband light source, the operating wave of the optical unit
A length of 1550nm.
Further, the data acquisition module is data collecting card.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of one-channel optical fiber Current Mutual Inductance system of the utility model.
In attached drawing, parts list represented by the reference numerals is as follows：
1st, wideband light source, 2, optical circulator, 3, faraday's speculum, 4, sensor fibre, 5, optical unit, 6, photodetection
Device, 7, data acquisition module, 8, host computer.
Embodiment
The principle and feature of the utility model are described below in conjunction with attached drawing, example is served only for explaining this practicality
It is new, it is not intended to limit the scope of the utility model.
As shown in Figure 1, Fig. 1 is a kind of structure diagram of one-channel optical fiber Current Mutual Inductance system of the utility model.It is a kind of
One-channel optical fiber Current Mutual Inductance system, is mainly made of two large divisions：Opticator and signal acquisition part.Optical section subpackage
Include wideband light source 1, optical circulator 2, optical unit 5, sensor fibre 4, faraday's speculum 3, photodetector 6.Signal acquisition
Part includes data acquisition module 7 and host computer 8.
The optical circulator 2 includes three ports, is respectively A ports, B ports and C-terminal mouth.
Wavelength is the ASE light sources of 1550nm, i.e. amplified spontaneous emission source centered on wideband light source 1.
Optical circulator 2 is a multiport passive device, is made of inside it, passes through Faraday rotor and birefringece crystal
Conversion to o light and e light in birefringece crystal, makes light wave be carried out wherein interior along specific direction, so as to efficiently solve light
The problem of belt and branch, reduce the complexity of light path system.
Faraday's speculum 3 is made of Faraday polarization apparatus and speculum, and incident light is incident after Faraday polarization apparatus
On the mirror, incident light is projected after speculum reflects by Faraday polarization apparatus.
Sensor fibre 4 is low-birefringence spin fiber.In the present embodiment, the step-length of sensor fibre 4 is 7mm, and pitch is
3mm, decays to 4db/km.Axial rotation of the low-birefringence spin fiber in pulling process can be eliminated by answering to a certain extent
Power and fibre core it is off-center caused by inherent linear birefrigence, simultaneously because rotation and the circular brief-ringence that introduces also can be certain
Suppress linear birefrigence in degree.Therefore, influence of the birefringence to measurement result can be reduced using low-birefringence spin fiber.
Optical unit 5 includes Faraday rotor and single axial birefringence crystal, single axial birefringence crystal and A ports, B ends
Mouth connection, Faraday rotor are connected with C-terminal mouth, operation wavelength 1550nm.It is two-fold that incident light from A ports is incident to single shaft
When penetrating crystal, incident light can be divided into o light and e light by single shaft birefringece crystal, and e light is dropped, and o light is incident to Faraday
Rotor is simultaneously projected through C-terminal mouth；Incident light from C-terminal mouth be incident to Faraday rotor when, it is two-fold that incident light can be incident on single shaft
Penetrate on crystal, and be divided into o light and e light through single axial birefringence crystal, o light is projected through A ports, and e light is projected through B ports.
Photodetector 6 is used to convert optical signal into electric signal.
In the present embodiment, data acquisition module 7 is selected and grinds magnificent data collecting card.
Host computer 8 is using programming softwares of the Matlab as host computer 8, easy to carry out complicated algorithm processing to gathered data
Computing.
Specifically, the output terminal of wideband light source 1 is connected with the first port of optical circulator 2, the second port of optical circulator 2
It is connected with the A ports of optical unit 5, the C-terminal mouth of optical unit 5 is connected by the input terminal of sensor fibre 4 and faraday's speculum 3
Connect；3rd port of optical circulator 2 is exposed, and the B ports of optical unit 5 are connected with the input terminal of photodetector 6, photodetection
6 output terminal of device is connected by data acquisition module 7 with host computer 8.
In such scheme, the incident light that wideband light source 1 is sent enters optical circulator 2 from the first port of optical circulator 2, then
Projected through second port, then incident light enters optical unit 5 through A ports, and incident light is polarized and rotates in optical unit 5
Enter sensor fibre 4 after 22.5 °, its plane of polarization rotates incident light by magnetic fields in sensor fibre 4, and incident light is through passing
Photosensitive fine 4 enter faraday's speculum 3, and incident light is again introduced into sensor fibre 4 after the reflection of faraday's speculum 3, it is polarized
Face rotates again, undergoes dual rotating incident light at this time into optical unit 5 and is forming two beams just in optical unit 5
Component is handed over, wherein B port of a branch of quadrature component through optical unit 5 is directly entered photodetector 6, another beam quadrature component warp
The second port of optical circulator is fallen into optical circulator 2 through exposed fibre loss.Data acquisition module 7 gathers photodetector 6
Detection data and these data are delivered to host computer 8, host computer 8 to these data calculate that to obtain plane of polarization rotating
Angle, and draw according to rotating angle the size of current value.Only need all the way optical signal of the demodulation reflected light after light splitting then
It can accurately draw size of current, the mistake that attenuation difference caused by avoiding passing through the method for binary channels sensing is brought to system
Difference, improves the accuracy of system, while also simplifies system structure because of the reason of single channel detection.
The utility model provides a kind of Current Mutual Inductance system simple in structure, the overall structure of the system be it is reflective,
Because it will not cause to measure because of the angular error in fusion process without carrying out 45 ° of weldings to polarization maintaining optical fibre when using
The decline of precision；And since the use of faraday's speculum 3 compensate for the influence of linear birefrigence, higher is kept to exempt from vibrations
Epidemic disease；Only the light all the way being reflected back is demodulated and data acquisition at the same time, using data Integral Processing algorithm, derivation is suitable for
Single pass signal processing algorithm, effectively eliminate that flashing is fixed and light path in error caused by various losses, raising
The sensing accuracy of the sensor-based system.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all in this practicality
Within new spirit and principle, any modification, equivalent replacement, improvement and so on, should be included in the guarantor of the utility model
Within the scope of shield.
Claims (7)
- A kind of 1. one-channel optical fiber Current Mutual Inductance system, it is characterised in that：Including wideband light source (1), optical circulator (2), farad Speculum (3), sensor fibre (4), optical unit (5), photodetector (6), data acquisition module (7) and host computer (8)； First port, second port and the 3rd port are provided with the optical circulator (2), A ends are provided with the optical unit (5) Mouth, B ports and C-terminal mouth；The output terminal of the wideband light source (1) is connected with the first port of the optical circulator (2), the optical circulator (2) Second port is connected with the A ports of the optical unit (5), and the 3rd port of the optical circulator (2) is exposed；The optics list The C-terminal mouth of first (5) is connected by the sensor fibre (4) with the input terminal of faraday's speculum (3)；The optical unit (5) B ports are connected with the input terminal of the photodetector (6), and photodetector (6) output terminal passes through the data Acquisition module (7) is connected with the host computer (8).
- A kind of 2. one-channel optical fiber Current Mutual Inductance system according to claim 1, it is characterised in that：The optical unit (5) Faraday rotor and single axial birefringence crystal are included, the single axial birefringence crystal is connected with A ports, B ports, institute Faraday rotor is stated to be connected with C-terminal mouth；When incident light is incident to the single axial birefringence crystal from A ports, incident light is divided into o light by the single axial birefringence crystal With e light, e light is dropped, and o light is incident to the Faraday rotor and is projected through C-terminal mouth；Incident light is incident to from C-terminal mouth During the Faraday rotor, incident light can be incident on the single axial birefringence crystal, and brilliant through the single axial birefringence Body is divided into o light and e light, and o light is projected through A ports, and e light is projected through B ports.
- A kind of 3. one-channel optical fiber Current Mutual Inductance system according to claim 1, it is characterised in that：The optical circulator bag Include Faraday rotor and birefringece crystal.
- A kind of 4. one-channel optical fiber Current Mutual Inductance system according to claim 1, it is characterised in that：Faraday's reflection Mirror (3) includes Faraday polarization apparatus and speculum, and on the mirror, incident light passes through incident light for incidence after Faraday polarization apparatus Projected after speculum reflection by Faraday polarization apparatus.
- A kind of 5. one-channel optical fiber Current Mutual Inductance system according to claim 1, it is characterised in that：The sensor fibre (4) it is low-birefringence spin fiber, the step-length of the sensor fibre (4) is 7mm, and pitch 3mm, decays to 4db/km.
- A kind of 6. one-channel optical fiber Current Mutual Inductance system according to claim 1, it is characterised in that：The wideband light source (1) wavelength is the ASE light sources of 1550nm centered on, and the operation wavelength of the optical unit (5) is 1550nm.
- A kind of 7. one-channel optical fiber Current Mutual Inductance system according to claim 1, it is characterised in that：The data acquisition module Block (7) is data collecting card.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721209411.7U CN207352055U (en) | 2017-09-20 | 2017-09-20 | A kind of one-channel optical fiber Current Mutual Inductance system |
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| CN201721209411.7U CN207352055U (en) | 2017-09-20 | 2017-09-20 | A kind of one-channel optical fiber Current Mutual Inductance system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108960A (en) * | 2019-05-16 | 2019-08-09 | 国家电网有限公司 | A kind of portable fiber-optic custom power quality detection and analysis device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108960A (en) * | 2019-05-16 | 2019-08-09 | 国家电网有限公司 | A kind of portable fiber-optic custom power quality detection and analysis device |
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