CN106323498A - Distributed optical fiber temperature sensor - Google Patents
Distributed optical fiber temperature sensor Download PDFInfo
- Publication number
- CN106323498A CN106323498A CN201510386813.3A CN201510386813A CN106323498A CN 106323498 A CN106323498 A CN 106323498A CN 201510386813 A CN201510386813 A CN 201510386813A CN 106323498 A CN106323498 A CN 106323498A
- Authority
- CN
- China
- Prior art keywords
- division multiplexer
- wavelength division
- optical fiber
- temperature sensor
- raman
- 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
Abstract
The invention relates to a distributed optical fiber temperature sensor comprising a pulsed optical fiber laser, a first optical isolator, a circulator and an optical fiber Raman amplifier which are connected in sequence. The circulator is connected with a third wavelength division multiplexer. The third wavelength division multiplexer is connected with a photoelectric conversion signal processing unit. The photoelectric conversion signal processing unit is connected with a data acquisition unit. The data acquisition unit is connected with a temperature demodulation unit. The technical scheme of the invention is applicable to long-distance (above 50Km) temperature measurement and disaster warning.
Description
Technical field:
The present invention relates to technical field of optical fiber sensing, be more particularly to a kind of distributed optical fiber temperature sensor.
Background technology:
Optical fiber sensing technology is that 20 century 70s rise along with optical fiber technology and the development of Fibre Optical Communication Technology
Plant New Sensing Technology.It is with light wave as transducing signal, with optical fiber as transmission medium, and perception and detection outer signals,
The aspects such as sensing mode, sensing principle and acquisition of signal and process all have the biggest difference with traditional electric sensor.
The application of distributed optical fiber temperature sensor based on backward Raman scattering principle also reaches its maturity, and has had
Various types of distributed optical fiber sensing device products, and start embed and be provided to electric power, harbour, petroleum and petrochemical industry transports,
In the various facilities such as railway, bridge, tunnel, highway, building, water system, dam colliery.But it is measuring length
(distance), spatial resolution, temperature measurement accuracy, reliability, many reference amounts and intelligent aspect still can not meet the requirement of application.
Particularly at the long distance oil-gas pipeline that required distance is higher, the transmission range of distributed optical fiber temperature measurement is proposed higher
Requirement.
Existing thermometry based on backward Raman scattering principle, is limited to inject the optical pulse energy of sensor fibre, passes
Sense distance is restricted, generally below 15Km.Use the most general injection Optical Amplification Technology, i.e. EDFA (Er-doped fiber
Amplify) or the mode amplified of tradition raman amplifier technology, can significantly improve the optical pulse energy of injection fibre, but by
There is power amplification in EDFA technology uneven, i.e. amplify the problem that flatness is the best, and use above two technology all to hold
Easily excite stimulated raman scattering, i.e. nonlinear effect in a fiber, it is impossible to realize the distance distributed temperature more than 30Km
Degree sensing.
Summary of the invention:
It is an object of the invention to provide a kind of distributed optical fiber temperature sensor, the long-distance transmissions of 50km can be achieved over.
For achieving the above object, the present invention by the following technical solutions: a kind of distributed optical fiber temperature sensor, including depending on
The pulse optical fiber of secondary connection, the 1st optoisolator, circulator and fiber Raman amplifier；Described circulator connects
3rd wavelength division multiplexer；Described 3rd wavelength division multiplexer connects photoelectric conversion signal processing unit；Described photoelectric conversion signal
Processing unit connects data acquisition unit；Described data acquisition unit connects temperature demodulation unit.
The 1st Raman pump laser that described fiber Raman amplifier includes being sequentially connected with, the 2nd optoisolator, the 1st ripple
Division multiplexer, sensor fibre, the 2nd wavelength division multiplexer the 6, the 3rd optoisolator and the 2nd Raman pump laser；Described
1 wavelength division multiplexer is connected with described circulator.
Described pulse optical fiber 1 sends pulsed light to described 1st optoisolator；1 port of described circulator 3 with
Described 1st optoisolator is connected；2 ports of described circulator 3 are connected with the R port of described 1st wavelength division multiplexer；
Described 1st wavelength division multiplexer 4COM port connects the described photosensitive fibre of biography；The end of described sensor fibre and described 2nd wavelength-division
The COM port of multiplexer is connected；The T end of described 1st wavelength division multiplexer connects described 1st Raman pump laser 9；Institute
The T-port stating the 2nd wavelength division multiplexer connects described 2nd optoisolator 7.
1660nm Raman diffused light and the 1450nm anti-Stokes Raman scattered light through two-way Raman amplifiction are by described the
The R port of 1 wavelength division multiplexer and 3 ports of circulator enter described 3rd wavelength division multiplexer；Described 3rd wavelength division multiplexer
Two output ports export the backward Raman scattering light of 1450nm Yu 1660nm respectively, and by described photoelectric conversion signal
Reason unit carries out opto-electronic conversion and signal processing and amplifying；Described data acquisition unit completes signal and adds up and will catch in data
Described temperature demodulation unit in the machine of position.
The centre wavelength of described pulse laser is 1550nm, and its spectral width is 0.1nm, the pulse of described pulse laser
Width is 5～100ns, and peak power is 1～100W, and repetition rate is 100Hz～1MHz.
The described T end of the 1st wavelength division multiplexer and the T end transmission peak wavelength of the 2nd wavelength division multiplexer are 1360 ± 15nm, respective
R end reflection wavelength is respectively 1450 ± 15nm and 1660 ± 15nm；The isolation of each wavelength division multiplexer is all higher than 45dB.
The operating wavelength range of described 2nd optoisolator and the 3rd optoisolator is 1360nm ± 30nm, and isolation is all higher than
60dB。
The wavelength of described 1st Raman pump laser and the 2nd Raman pump laser is 1360nm, and each Raman pump swashs
The spectrum 3dB spectrum width of light device is 0.1nm, and respective output is 100-800mW.
The T end transmission wave band of described 3rd wavelength division multiplexer is 1450 ± 15nm and 1660 ± 15nm, and its isolation is more than
60dB。
The response wave length of described photoelectric conversion signal processing unit is 1000～1700nm, and responsiveness is 6～9A/W, bandwidth
For 100MHz～300MHz.
With immediate prior art ratio, the present invention provides technical scheme to have following excellent effect
1, technical solution of the present invention avoids the mode using relaying to extend distance sensing, it is not necessary to increase work along the line at sensor fibre
Stand, it is possible to effective solution Cost Problems also significantly reduces difficulty of construction；
2, technical solution of the present invention have employed the mode of Raman amplifiction so that system is in long-distance sensing back scattering along the line
Signal is uniformly amplified, and improves the dynamic range of useful signal；
3, technical solution of the present invention simple in construction, signal to noise ratio are good；
4, technical solution of the present invention is applicable to distance temperature survey and the disaster alarm of more than 50Km；
5, technical solution of the present invention uses the pump light of 1360nm wave band individually to enter Raman anti-Stokes rear orientation light
Row Raman amplifiction, and have employed Bi-directional amplifier mode, the nearly 30dB of gain, do not changing Anti-Stokes signal signal to noise ratio
Under the conditions of be exaggerated Anti-Stokes signal, substantially prolongs the distance sensing of temperature-measuring system of distributed fibers.
Accompanying drawing explanation
The sensor construction schematic diagram that Fig. 1 provides for technical solution of the present invention；
Wherein, 1-pulse optical fiber, 2-the 1st optoisolator, 3-circulator, 4-the 1st wavelength division multiplexer, 5-sense light
Fibre, 6-the 2nd wavelength division multiplexer, 7-the 2nd optoisolator, 8-the 3rd optoisolator, 9-the 1st Raman pump laser, 10-the 2nd
Raman pump laser, 11-the 3rd wavelength division multiplexer, 12-photoelectric conversion signal processing unit, 13-data acquisition unit, 14-
Temperature demodulation unit.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be described in further detail.
Embodiment 1:
The invention of this example provides a kind of distributed optical fiber temperature sensor, as it is shown in figure 1, include pulse optical fiber 1,
1st optoisolator 2, circulator 3, the 1st wavelength division multiplexer 4, sensor fibre 5, the 2nd wavelength division multiplexer 6, the 2nd light
Isolator 7, the 3rd optoisolator 8, the 1st Raman pump laser 9, the 2nd Raman pump laser 10, the 3rd wavelength-division
Multiplexer 11, photoelectric conversion signal processing unit 12, data acquisition unit 13, temperature demodulation unit 14.Pulse fiber
Laser instrument 1 sends pulsed light, is connected with the 1st optoisolator 2, and its effect is to prevent the reflection light in light path from swashing pulse
Light device produces and destroys.1 port of circulator 3 and the 1st optoisolator 2 are connected, 2 ports and the 1st wavelength division multiplexer 4
R port is connected, and the 1st wavelength division multiplexer 4COM port connects sensor fibre.Sensor fibre end and the 2nd wavelength-division multiplex
The COM end of device 6 is connected, and the T end of the 1st wavelength division multiplexer the 4 and the 2nd wavelength division multiplexer 6 connects the 1st Raman pump respectively
Pu laser instrument the 9, the 2nd optoisolator the 7 and the 2nd Raman pump laser the 10, the 3rd optoisolator 8.1660nm Raman
Scattered light and the 1450nm anti-Stokes Raman scattered light through the two-way Raman amplifiction R by the 1st wavelength division multiplexer 4
Port, 3 ports of circulator 3 enter the 3rd wavelength division multiplexer 8, and the 3rd wavelength division multiplexer 11 two output port is respectively
The backward Raman scattering light of output 1450nm Yu 1660nm, and carried out photoelectricity by opto-electronic conversion and signal processing unit 12 and turn
Changing and signal processing and amplifying, data acquisition unit 13 completes signal and adds up and data are uploaded host computer temperature demodulation unit 14.
By the 1st wavelength division multiplexer the 4, the 2nd wavelength division multiplexer 6, the 1st Raman pump laser the 9, the 2nd Raman pump swashs
Light device the 10, the 2nd optoisolator the 7, the 3rd optoisolator 8 and sensor fibre 5 constitute two-way S-band fiber Raman and amplify
Device.
1st wavelength division multiplexer, the 2nd wavelength division multiplexer and the 3rd wavelength division multiplexer are 3 port devices, and respectively R is (anti-
Penetrate), T (transmission), COM (communication) port.
The operation principle of fiber Raman amplifier is: the Raman pump laser of 1360nm occurs Raman to dissipate in sensor fibre
Penetrating effect, can amplify flashlight that wavelength is 1446nm and have the bandwidth of 6THz, being converted into wavelength amplification range is
The Raman anti-Stokes light of 45nm, 1450nm wave band just falls in the gain bandwidth of 1360nm pump light, Jiu Huishou
Amplification to heavy pumping light.Wherein, the 1st, the 2nd Raman pump laser each serves as backward, the work of forward direction Raman amplifiction
With.This distributed air-defense, the shortcoming that can overcome centralized fiber amplifier, transmission line and amplification are with in a fiber
Carrying out, thus coupling loss is the least, noise is relatively low, and gain stability is good.
The described Distributed temperature fiber optic sensor merging single order Raman amplifiction effect, it is characterised in that the 1st, the 2nd,
3rd wavelength division multiplexer is 3 port devices, respectively R (reflection), T (transmission), COM (communication) port.
The centre wavelength of described pulse laser 1 is 1550nm, and spectral width is 0.1nm, laser pulse width be 5～
100ns is adjustable, and peak power is 1～100W adjustable, and repetition rate is that 100Hz～1MHz is adjustable.
Described optoisolator 2, operating wavelength range is 1550nm ± 30nm, isolation ＞ 60dB.
Described circulator 3, operating wavelength range is 1550nm ± 30nm, isolation ＞ 50dB.
The 1st described wavelength division multiplexer 4 and 2 wavelength division multiplexer 6, T end transmission peak wavelength is the reflection of 1360 ± 15nm, R end
Wavelength is 1450 ± 15nm, 1660 ± 15nm, and isolation is more than 45dB.
Described sensor fibre 5 can be G651-50/125 μm or 62.5/125 μm multimode fibre or G652-9/125
μm communication single-mode fiber or special material coated fiber (coating of polyimides, carbon, metal coating).
Described optoisolator 7,8, operating wavelength range is 1360nm ± 30nm, isolation ＞ 60dB
The the 1st, the 2nd described Raman pump laser 9,10, wavelength is 1360nm, and spectrum 3dB spectrum width is 0.1nm,
Output is that 100-800mW is adjustable.
The 3rd described wavelength division multiplexer 11, T (transmission) end transmission wave band is respectively 1450 ± 15nm and 1660 ± 15nm,
Isolation is more than 60dB.
Described opto-electronic conversion and signal processing unit 12 include indium gallium arsenic photoelectric conversion module, its response wave length: 1000～
1700nm, responsiveness is 6～9A/W, carries a width of 100MHz～300MHz.
Described data acquisition unit 13, sample rate 100～500MSPS, sampling precision is 8～14bits, supports hardware
Accumulation function.
Described temperature demodulation unit includes temperature demodulation algorithm and realizes the host computer of this function.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, affiliated
Although the those of ordinary skill in field with reference to above-described embodiment it is understood that still can be to the detailed description of the invention of the present invention
Modifying or equivalent, these, without departing from any amendment of spirit and scope of the invention or equivalent, all exist
Within the claims of the present invention that application is awaited the reply.
Claims (10)
1. a distributed optical fiber temperature sensor, it is characterised in that: include pulse optical fiber, the 1st light being sequentially connected with
Isolator, circulator and fiber Raman amplifier；Described circulator connects the 3rd wavelength division multiplexer；Described 3rd wavelength division multiplexer
Connect photoelectric conversion signal processing unit；Described photoelectric conversion signal processing unit connects data acquisition unit；Described data acquisition
Unit connects temperature demodulation unit.
2. a kind of distributed optical fiber temperature sensor as claimed in claim 1, it is characterised in that: described fiber Raman amplifier
Including the 1st Raman pump laser being sequentially connected with, the 2nd optoisolator, the 1st wavelength division multiplexer, sensor fibre, the 2nd ripple
Division multiplexer the 6, the 3rd optoisolator and the 2nd Raman pump laser；Described 1st wavelength division multiplexer is connected with described circulator.
3. a kind of distributed optical fiber temperature sensor as claimed in claim 2, it is characterised in that: described pulse optical fiber
1 sends pulsed light to described 1st optoisolator；1 port of described circulator 3 is connected with described 1st optoisolator；Described
2 ports of circulator 3 are connected with the R port of described 1st wavelength division multiplexer；Described 1st wavelength division multiplexer 4COM port is even
Connect the described photosensitive fibre of biography；The end of described sensor fibre is connected with the COM port of described 2nd wavelength division multiplexer；Described 1st ripple
The T end of division multiplexer connects described 1st Raman pump laser 9；The T-port of described 2nd wavelength division multiplexer connects the described 2nd
Optoisolator 7.
4. a kind of distributed optical fiber temperature sensor as claimed in claim 3, it is characterised in that: 1660nm Raman diffused light
With R port and the ring that the 1450nm anti-Stokes Raman scattered light through two-way Raman amplifiction passes through described 1st wavelength division multiplexer
3 ports of shape device enter described 3rd wavelength division multiplexer；Described two output ports of 3rd wavelength division multiplexer export 1450nm respectively
With the backward Raman scattering light of 1660nm, and carried out opto-electronic conversion and signal amplification by described photoelectric conversion signal processing unit
Reason；Described data acquisition unit completes the described temperature demodulation unit that signal is cumulative and data is uploaded in host computer.
5. a kind of distributed optical fiber temperature sensor as claimed in claim 1, it is characterised in that: in described pulse laser
The a length of 1550nm of cardiac wave, its spectral width is 0.1nm, and the pulse width of described pulse laser is 5～100ns, peak power
Being 1～100W, repetition rate is 100Hz～1MHz.
6. a kind of distributed optical fiber temperature sensor as claimed in claim 2, it is characterised in that: described 1st wavelength division multiplexer
T end and the T end transmission peak wavelength of the 2nd wavelength division multiplexer be 1360 ± 15nm, respective R end reflection wavelength is respectively 1450 ±
15nm and 1660 ± 15nm；The isolation of each wavelength division multiplexer is all higher than 45dB.
7. distributed optical fiber temperature sensor as claimed in claim 2 a kind of, it is characterised in that: described 2nd optoisolator and
The operating wavelength range of the 3rd optoisolator is 1360nm ± 30nm, and isolation is all higher than 60dB.
8. a kind of distributed optical fiber temperature sensor as claimed in claim 2, it is characterised in that: described 1st Raman pump swashs
The wavelength of light device and the 2nd Raman pump laser is 1360nm, and the spectrum 3dB spectrum width of each Raman pump laser is
0.1nm, respective output is 100-800mW.
9. a kind of distributed optical fiber temperature sensor as claimed in claim 1, it is characterised in that: described 3rd wavelength division multiplexer
T end transmission wave band be 1450 ± 15nm and 1660 ± 15nm, its isolation be more than 60dB.
10. a kind of distributed optical fiber temperature sensor as claimed in claim 1, it is characterised in that: described photoelectric conversion signal
The response wave length of processing unit is 1000～1700nm, and responsiveness is 6～9A/W, carries a width of 100MHz～300MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510386813.3A CN106323498A (en) | 2015-07-03 | 2015-07-03 | Distributed optical fiber temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510386813.3A CN106323498A (en) | 2015-07-03 | 2015-07-03 | Distributed optical fiber temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106323498A true CN106323498A (en) | 2017-01-11 |
Family
ID=57728173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510386813.3A Pending CN106323498A (en) | 2015-07-03 | 2015-07-03 | Distributed optical fiber temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106323498A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6657777B1 (en) * | 2001-12-05 | 2003-12-02 | Cisco Technology, Inc | Interleaved lumped raman amplifier structure based on highly nonlinear fibers for densely spaced WDM channels |
| CN2896250Y (en) * | 2006-05-15 | 2007-05-02 | 四川莱威科技有限公司 | Distribution-type optical-fiber temperature sensor |
| CN101713689A (en) * | 2009-11-13 | 2010-05-26 | 太原市电子研究设计院 | Temperature-measuring system of distributed fibers |
| CN202057344U (en) * | 2011-03-11 | 2011-11-30 | 江苏联通电缆有限公司 | Ultra Longhaul optical fiber Bragg raster sensing system based on second order Raman amplification |
| CN202433122U (en) * | 2012-01-06 | 2012-09-12 | 杭州电子科技大学 | Distributed intelligent power grid optical fiber temperature measurement system |
| EP2503655A2 (en) * | 1995-03-20 | 2012-09-26 | Fujitsu Limited | Optical fiber amplifier and dispersion compensating fiber module for optical fiber amplifier |
-
2015
- 2015-07-03 CN CN201510386813.3A patent/CN106323498A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2503655A2 (en) * | 1995-03-20 | 2012-09-26 | Fujitsu Limited | Optical fiber amplifier and dispersion compensating fiber module for optical fiber amplifier |
| US6657777B1 (en) * | 2001-12-05 | 2003-12-02 | Cisco Technology, Inc | Interleaved lumped raman amplifier structure based on highly nonlinear fibers for densely spaced WDM channels |
| CN2896250Y (en) * | 2006-05-15 | 2007-05-02 | 四川莱威科技有限公司 | Distribution-type optical-fiber temperature sensor |
| CN101713689A (en) * | 2009-11-13 | 2010-05-26 | 太原市电子研究设计院 | Temperature-measuring system of distributed fibers |
| CN202057344U (en) * | 2011-03-11 | 2011-11-30 | 江苏联通电缆有限公司 | Ultra Longhaul optical fiber Bragg raster sensing system based on second order Raman amplification |
| CN202433122U (en) * | 2012-01-06 | 2012-09-12 | 杭州电子科技大学 | Distributed intelligent power grid optical fiber temperature measurement system |
Non-Patent Citations (1)
| Title |
|---|
| 范文文: "基于拉曼放大的千公里传输系统", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102322806B (en) | Brillouin optical time domain analyzer relevant to chaotic laser | |
| CN103152097B (en) | A kind of adopt Random Laser to amplify polarization and phase sensitive optical time domain reflectometer | |
| CN201680924U (en) | Distributive optical fiber Raman and Brillouin scattering sensor | |
| CN105043586A (en) | Few-mode fiber based Raman distributed temperature measurement system and temperature measurement method | |
| CN108180853B (en) | Brillouin optical time domain reflection strain detection device based on chaotic modulation | |
| CN102322808B (en) | Very long range pulse coding distribution type Fiber Raman and Brillouin photon sensor | |
| CN101162175A (en) | Ultra-remote distributed fiber raman photons temperature sensor integrated with raman amplifier | |
| CN202057344U (en) | Ultra Longhaul optical fiber Bragg raster sensing system based on second order Raman amplification | |
| CN105067143B (en) | A kind of homodyne Brillouin optical time-domain reflectometer based on Raman amplifiction | |
| CN101852655A (en) | Distributed fiber Raman/Brillouin scattering sensor | |
| CN108760080B (en) | A kind of distributed fiber Raman temperature measuring equipment and method based on ASE noise | |
| CN203605976U (en) | Distributed type optical fiber temperature and stress sensing device | |
| CN104697558A (en) | Distributed optical fiber multi-parameter sensing measurement system | |
| CN203310428U (en) | Distributed Brillouin optical fiber sensing system based on coherent detection | |
| CN202177385U (en) | Ultra-long-range fully-distributed type optical Rayleigh and Raman scattering sensor of pulse coding | |
| US20190204192A1 (en) | Fiber optic interrogation system for multiple distributed sensing systems | |
| CN101526373A (en) | Waveguide interference sensor | |
| CN103616091A (en) | Distributed optical fiber temperature and stress sensing device | |
| CN102680137A (en) | Cascading distributed fiber Raman temperature measuring system | |
| CN102538844A (en) | Method and system for improving sensing performance of long-distance Brillouin optical time domain analysis system | |
| CN103323041A (en) | Distributed Brillouin optical fiber sensing system based on coherent detection | |
| CN202195825U (en) | Extra-long distance pulse-coding distributed optical fiber Raman and Brillouin photon sensor | |
| CN101893802A (en) | Photo-sensing relay amplifier and method thereof | |
| CN101261164A (en) | Juxtaposed distributed optical fibre temperature sensor | |
| CN102359830A (en) | Multiple Raman scattering effect fused ultra remote fiber temperature measurement sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: No. 15, Qinghe Xiaoying East Road, Haidian District, Beijing Applicant after: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Applicant after: State Grid Corporation of China Address before: No. 15, Qinghe Xiaoying East Road, Haidian District, Beijing Applicant before: China Electric Power Research Institute Applicant before: State Grid Corporation of China |
|
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20180614 Address after: No. 15, Qinghe Xiaoying East Road, Haidian District, Beijing Applicant after: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Applicant after: State Grid Corporation of China Applicant after: STATE GRID ZHEJIANG ELECTRIC POWER Co.,Ltd. Address before: No. 15, Qinghe Xiaoying East Road, Haidian District, Beijing Applicant before: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Applicant before: State Grid Corporation of China |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170111 |