CN2630841Y - Opticalfiber grating sensing and measuring system for oil-gas pipeline detection - Google Patents
Opticalfiber grating sensing and measuring system for oil-gas pipeline detection Download PDFInfo
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- CN2630841Y CN2630841Y CN 03264532 CN03264532U CN2630841Y CN 2630841 Y CN2630841 Y CN 2630841Y CN 03264532 CN03264532 CN 03264532 CN 03264532 U CN03264532 U CN 03264532U CN 2630841 Y CN2630841 Y CN 2630841Y
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Abstract
The utility model provides a system device which is used in the plural points distributed detecting of the statuses of the oil and gas long transporting pipeline such as corrosion, crack, leakage, rap junction, scaling and so on by using the fiber and light shed sensing technology, the detecting device includes a near infrared broadband semiconductor laser source array, a wavelength division multiplexer, a fiber bidirectional coupler, a fiber and light shed sensor array, a spectrum analyzer and a signal transmission optical cable. The near infrared continuous optical signal which is sent out by the semiconductor laser source array is transmitted to the fiber and light shed sensor array which is buried in the oil and gas long transporting pipeline through the wavelength division multiplexer and the bidirectional coupler, the sensor array detects the fluid temperature and the pressure variation in the pipeline and reflects back to the bidirectional coupler in the form of fiber and light shed center wavelength migration, and couples to the spectrum analyzer, by using the computer controlling to demodulate and treat the signal, to obtain the relevant physical quantity changes in the pipeline, thus obtains the transporting status of the oil and gas long transporting pipeline.
Description
Relate to the field
The utility model belongs to oil/gas pipe line detection technique field, situations such as to be a kind of fiber grating sensing technology cured to burn into crack in the oil/gas pipe line, knot, fouling are carried out many reference amounts multiple spot distributed detection system, specifically, be a kind of optical fiber grating sensing testing system that oil-gas pipeline detects that is used for.
Background technology
The pipe detection technology is the new and high technology that pipeline industry developed country competitively develops, and is mainly used in potential safety hazards such as detecting the burn into wearing and tearing in use of long distance oil-gas conveyance conduit, crack.At present, be with leakage method, ultrasonic method, eddy-current method, inductive electromagnetic method etc. basically in long oil/gas pipe line detects, although the development that these methods have experienced decades and perfect, but have generally that detection resolution is low, signal transmission and demodulated complex, instrument heaviness, sensing range is narrow and operation with show deficiencies such as inconvenience, particularly be subject to high temperature, high pressure, long influence apart from complex environment factors such as, electromagnetic field and chemical corrosions.Though reported the application of optical fiber sensing technology in oil-gas pipeline detects on some magazines abroad in recent years, be the conventional fiber method for sensing basically, as heat radiation type, fluorescence decay formula, light blocking type etc.These methods generally all are the tests of single-point, single parameter, Chinese patent 00244460.7 disclosed " integrated optical fibre strain and temp sensor device ", though it can carry out discriminating measurement to the strain and the temperature of single-point, can not carry out multiple spot discriminating measurement simultaneously.
Fiber grating can bury as the sensor of intelligent structure and overlay on testee and material internal carries out many physical quantitys such as pressure, temperature, stress, strain, flow velocity, flow, viscosity.It detects principle is that wavelength shift, phase change, the polarization state that is caused fiber grating reflection or transmission spectrum by the variation of measurand changes and Strength Changes basically, reaches testing goal to measurand by these spectrum change of demodulation.Because fiber grating has little, in light weight, corrosion-resistant, the anti-electromagnetic interference (EMI) of volume, many essential advantage such as easy of integration, simple in structure, so since the appearance seventies in 20th century, be subjected to common concern both domestic and external.People do one's utmost to explore its application aspect optical communication and light sensing.The U.S., Canada, Japan and Germany have more deep research and development to use, and in fields such as civil building engineering, medical treatment, environmental protection and aviation tests some application are arranged also.But the research that utilizes fiber grating to carry out many reference amounts, multiple spot distribution tests is used and be yet there are no report.
Summary of the invention
The purpose of this utility model is to provide a kind of optical fiber grating sensing testing system that oil-gas pipeline detects that is used for,, fouling etc. cured to burn into crack in the oil/gas pipe line, oil and gas leakage, knot with fiber grating sensing technology carries out that many reference amounts, multiple spot distribute, dynamic online detection, so as scientifically to grasp the inner and outer walls of pipeline corrosion condition, for the pipeline running quality is estimated, maintenance, technological transformation provide theoretical foundation.
The utility model is achieved in that
Comprise wideband light source array 1, wavelength division multiplexer 2, light path one-way isolator 3, light path bidirectional coupler 4 and fiber-optic grating sensor array 5, signal demodulation and display 6, optical fiber 7, wideband light source array 1 is connected with wavelength division multiplexer 2 parallel coupled, wavelength division multiplexer 2, light path one-way isolator 3, light path bidirectional coupler 4, fiber-optic grating sensor array 5 connect successively by optical fiber 7, and the signal demodulation is connected with light path bidirectional coupler 4 with display 6.
Light path one-way isolator 3 stops the light signal that reflects from sensor array 5 to enter wavelength division multiplexer 2 through light path bidirectional coupler 4, light path bidirectional coupler 4 is sent incident light into fiber-optic grating sensor array 5, and the light signal of fiber-optic grating sensor array 5 reflections is sent into signal demodulation and display 6.
The utility model also adopts following technical scheme:
Wideband light source array 1 is made up of more than one wideband light source, and each wideband light source output power is identical, the centre wavelength difference, and bandwidth is identical, and each wideband light source output power is 1mw, bandwidth 40nm～80nm.
The fiber-optic grating sensor FBG on each check point forms fiber-optic grating sensor array 5 on the same optical fiber 7 by being distributed in, the coupling resonance centre wavelength of each fiber-optic grating sensor FBG is different, and bandwidth is identical, and the spacing distance of adjacent check point is 10～20 meters.
Wideband light source array 1 is complementary with the wavelength coverage of fiber-optic grating sensor array 5, and the centre wavelength of wideband light source array 1 and wavelength bandwidth cover the coupling resonance wavelength coverage of fiber-optic grating sensor array 5 all fiber-optic grating sensor FBG fully.
The number of wideband light source is determined by the distance of the length of testee, adjacent check point and the bandwidth of wideband light source.
Signal demodulation and display 6 available spectrum analysers or Wavelength-encoding and demodulation, photo-translating system.
Simultaneously fiber grating resonance coupled wavelength side-play amount is produced cross sensitivity in order to overcome these two kinds of factors of temperature and pressure, the present invention also by the following technical solutions.
When single parameter measurement, arrange to tested parameter sensitivity and to the insensitive sensor fibre grating of other parameters at each check point.As when the temperature survey, arrange temperature sensitive fiber grating at check point; When pressure survey, arrange the quick fiber grating of power at check point.
When two parameter measurement, the difference arranged alternate is to a measurement parameter sensitivity and to another parameter insensitive optical fiber optical grating sensor on check point, in discriminating measurement in temperature and pressure, difference temperature sensitive fiber grating of arranged alternate and Li Min fiber grating on check point, or near a check point, arrange the fiber-optic grating sensor of two different sensing capabilities simultaneously, these two fiber-optic grating sensor spacings are 100 μ m～400 μ m.
During system works, wideband light source array 1 sends the light wave sequence, the light wave centre wavelength difference that each wideband light source sends, after wavelength division multiplexer 2 coupling outputs, the light wave of various wavelength can transmit on an optical fiber 7 without interfering with each other, output wave enters fiber-optic grating sensor array 5 through light path one-way isolator 3 and light path bidirectional coupler 4, and the fiber-optic grating sensor FBG that is distributed on each check point only reflects the light wave of separately resonance coupled wavelength (foveal reflex wavelength).Near check point environment changes, the foveal reflex wavelength that is distributed in the light pricker grating sensor FBG of check point produces skew, the reflecting light reverse transfer of fiber-optic grating sensor array 5 is by 4 entering signal demodulation of light path bidirectional coupler and display 6, obtain the metrical information of each position, measured point, so this device is simple, practical.
Advantage of the present utility model is:
1. general mechanical stress Strain Method, sonic method, electromagnetic method compared in this measuring system and the present pipe detection, have little, in light weight, corrosion-resistant, the anti-electromagnetic interference (EMI) of volume, characteristics such as simple in structure, also have the evident characteristic of integrated, microminiaturized, wavelength-division multiplex, networking.
2. the sensor fibre grating can bury and overlay on the intellectuality that realizes permanent real-time online in the testee and detect, and is more suitable for the multi-parameter measurements such as pressure, temperature, stress, viscosity in the oil and gas long distance pipeline.
3. on an optical fiber cable, up to a hundred fiber-optic grating sensors can be arranged, the on-line measurement simultaneously of long oil/gas pipe line multiple spot can be realized.
4. on an optical fiber grating sensing check point, can survey 2 parameters simultaneously, realize multiple spot discriminating measurement simultaneously.
5. compare with long oil/gas pipe line conventional sense device, have higher measurement sensitivity and more wide measurement range.
Description of drawings
Fig. 1 is a sensing testing system synoptic diagram of the present utility model.
Concrete enforcement
In following embodiment, wideband light source is semiconductor laser SLD, light path bidirectional coupler 4 is 3dB2 * 2 light path couplers, signal demodulation and display 6 are the MS9710C spectroanalysis instrument, temperature fiber-optic grating sensor FBG is the silicon optical fiber grating of epoxide resin polymer material package, pressure fiber-optic grating sensor FBG is the silicon optical fiber grating or the plastic optical fiber grating of teflon encapsulation, the Couple S/N:340322 that light path one-way isolator 3 is produced for Wuhan Research Institute of Posts ﹠ Telecommunications.
The long oil/gas pipe linear pressure of embodiment 1:3km multiple spot is measured simultaneously.
Measurement length is 3km, and adjacent check point spacing 20m so 150 check points are arranged, promptly selects the pressure fiber-optic grating sensor of 150 different coupling resonance wavelength for use, and each fiber-optic grating sensor bandwidth is 2nm.
The output power of each broadband semiconductor laser instrument SLD is 1mw, operation wavelength bandwidth 50nm, and each SLD centre wavelength can cover 25 fiber-optic grating sensors, so need the SLD of 6 different centre wavelengths, its centre wavelength is respectively λ
1=1300nm, λ
2=1350nm, λ
3=1400nm, λ
4=1450nm, λ
5=1500nm, λ
6=1550nm, the operating wavelength range of 6 SLD arrays are 1275nm～1575nm.
The coupling resonance wavelength that covers all fiber-optic grating sensor FBG of fiber-optic grating sensor array fully according to the centre wavelength and the bandwidth range of broadband semiconductor laser instrument SLD array 1 is so the coupling resonance centre wavelength of 150 corresponding pressure fiber-optic grating sensor FBG is respectively λ
1=1275nm, λ
2=1277nm, λ
3=1279nm ... λ
149=1571nm, λ
150=1573nm.
The measuring system device of this embodiment is as shown in Figure 1: wherein with 150 pressure fiber-optic grating sensor FBG welding on an optical fiber 7, the spacing of adjacent sensors is 20m, constitute fiber-optic grating sensor array 5, bury and overlay on the oil/gas pipe inwall, 6 broadband semiconductor laser instrument SLD are connected with 6 * No. 6 wavelength division multiplexers, 2 parallel coupled, 6 * No. 6 wavelength division multiplexers 2, light path one-way isolator 3,2 * 2 light path couplers 4, pressure fiber-optic grating sensor array 5 connect successively by optical fiber 7, and 2 * 2 light path couplers 4 are connected with display 6 optical fiber with the signal demodulation.
The different centre wavelength light wave sequences that broadband semiconductor laser array 1 sends, centre wavelength is respectively λ
1=1300nm, λ
2=1350nm, λ
3=1400nm, λ
4=1450nm, λ
5=1500nm, λ
6=1550nm is through the 2 coupling outputs of 6 * No. 6 wavelength division multiplexers, import the pressure measurement fiber-optic grating sensor FBG that is distributed on each check point into by unidirectional light path isolator 3 and 2 * 2 light path couplers 4, each fiber-optic grating sensor FBG will satisfy the light wave reflection of coupling resonance wavelength, the reflecting light signal is through 4 entering signal demodulation of 2 * 2 light path couplers and display 6, pressure changes near certain check point of oil/gas pipe line, cause that fiber-optic grating sensor FBG reflection wavelength produces skew on this check point, the reflection wave signal of skew draws the variable quantity of this point pressure through 4 input signal demodulation of 2 * 2 light path couplers and display 6.
The long oil/gas pipe line temperature and pressure of embodiment 2:2km is discriminating measurement simultaneously
Measurement length is 2km, and adjacent check point spacing 10m so 200 check points are arranged, promptly selects each 100 of the temperature fiber-optic grating sensor of different coupling resonance wavelength and pressure fiber-optic grating sensors for use, and each fiber-optic grating sensor bandwidth is 2nm.
The output power of each broadband semiconductor laser instrument SLD is 1mw, operation wavelength bandwidth 80nm, and each SLD centre wavelength can cover 40 fiber-optic grating sensors, so need the SLD of 5 different centre wavelengths, its centre wavelength is respectively λ
1=1300nm, λ
2=1380nm, λ
3=1460nm, λ
4=1540nm, λ
5The operating wavelength range of=1620nm, 5 SLD arrays is 1260nm～1660nm.
The coupling resonance wavelength that covers all fiber-optic grating sensor FBG of fiber-optic grating sensor array fully according to the centre wavelength and the bandwidth range of broadband semiconductor laser instrument SLD array 1 is so 100 corresponding pressure fiber-optic grating sensor FBG and the coupling resonance centre wavelength of 100 temperature fiber-optic grating sensor FBG are respectively λ
1=1261nm, λ
2=1263nm, λ
3=1265nm ... λ
199=1657nm, λ
200=1659nm.
The measuring system device of this embodiment is as shown in Figure 1: wherein with 100 pressure fiber-optic grating sensor FBG and 100 temperature fiber-optic grating sensor FBG respectively alternately welding on an optical fiber 7, the spacing of adjacent sensors is 10m, constitute fiber-optic grating sensor array 5, bury and overlay on the oil/gas pipe inwall, 5 broadband semiconductor laser instrument SLD are connected with 5 * No. 5 wavelength division multiplexers, 2 parallel coupled, 5 * No. 5 wavelength division multiplexers 2, light path one-way isolator 3,2 * 2 light path couplers 4, fiber-optic grating sensor array 5 connects successively by optical fiber 7, and 2 * 2 light path couplers 4 are connected with display 6 optical fiber with the signal demodulation.
The long oil/gas pipe line temperature and pressure of embodiment 3:2km is discriminating measurement simultaneously
The principle of present embodiment is identical with embodiment 2,
The principle of present embodiment is identical with embodiment 2, and its difference is to arrange a temperature fiber-optic grating sensor and a pressure fiber-optic grating sensor near each check point simultaneously, and these two fiber-optic grating sensor spacings are 100 μ m～400 μ m.
Measurement length is 2km, adjacent check point spacing 20m, so 100 check points are arranged, arrange each 1 of temperature fiber-optic grating sensor and pressure fiber-optic grating sensor near each check point simultaneously, select each 100 of the temperature fiber-optic grating sensor of different coupling resonance centre wavelengths and pressure fiber-optic grating sensors for use, each fiber-optic grating sensor bandwidth is 2nm.
The output power of each broadband semiconductor laser instrument SLD is 1mw, operation wavelength bandwidth 80nm, and each SLD centre wavelength can cover 40 fiber-optic grating sensors, so need the SLD of 5 different centre wavelengths, its centre wavelength is respectively λ
1=1300nm, λ
2=1380nm, λ
3=1460nm, λ
4=1540nm, λ
5The operating wavelength range of=1620nm, 5 SLD arrays is 1260nm～1660nm.
The coupling resonance wavelength that covers all fiber-optic grating sensor FBG of fiber-optic grating sensor array fully according to the centre wavelength and the bandwidth range of broadband semiconductor laser instrument SLD array 1 is so 100 corresponding pressure fiber-optic grating sensor FBG and the coupling resonance centre wavelength of 100 temperature fiber-optic grating sensor FBG are respectively λ
1=1261nm, λ
2=1263nm, λ
3=1265nm ... λ
199=1657nm, λ
200=1659nm.
The measuring system device of this embodiment is as shown in Figure 1: wherein arrange a pressure fiber-optic grating sensor and 1 temperature fiber-optic grating sensor near each check point, fiber-optic grating sensor welding on each check point is on an optical fiber 7, the spacing of adjacent sensors is 20m, constitute fiber-optic grating sensor array 5, bury and overlay on the oil/gas pipe inwall, 5 broadband semiconductor laser instrument SLD are connected with 5 * No. 5 wavelength division multiplexers, 2 parallel coupled, 5 * No. 5 wavelength division multiplexers 2, light path one-way isolator 3,2 * 2 light path couplers 4, fiber-optic grating sensor array 5 connects successively by optical fiber 7, and 2 * 2 light path couplers 4 are connected with display 6 optical fiber with the signal demodulation.
Long oil/gas pipe uniaxial stress of embodiment 4:2km and pressure is discriminating measurement simultaneously
The principle of present embodiment is identical with embodiment 3, its difference has been to adopt the Chinese patent (application number 02246122.1 of same applicant in first to file, a kind of fiber-optic grating sensor that is used for the oil and gas pipes detection), its advantage is that this sensor will be surveyed the stress fiber grating and the measuring pressure fiber grating is packaged together, and can measure the variation of a certain check point upper stress and pressure simultaneously.
Its concrete enforcement is this fiber-optic grating sensor that two fiber gratings on each check point among the embodiment 3 is changed into identical coupling resonance wavelength and bandwidth, and other devices are identical with embodiment 3 with technical indicator.
Claims (6)
1, a kind of optical fiber grating sensing testing system that is used for the oil-gas pipeline detection, comprise wideband light source array 1, wavelength division multiplexer 2, light path one-way isolator 3, light path bidirectional coupler 4 and fiber-optic grating sensor array 5, signal demodulation and display 6, optical fiber 7, it is characterized in that: wideband light source array 1 is connected with wavelength division multiplexer 2 parallel coupled, wavelength division multiplexer 2, light path one-way isolator 3, light path bidirectional coupler 4, fiber-optic grating sensor array 5 connect successively by optical fiber 7, and light path bidirectional coupler 4 is connected with display 6 with the signal demodulation.
2, a kind of optical fiber grating sensing testing system that oil-gas pipeline detects that is used for according to claim 1, it is characterized in that: wideband light source array 1 is made up of an above wideband light source, each wideband light source output power is identical, centre wavelength is different, bandwidth is identical, each wideband light source output power is 1mw, and bandwidth is 40nm～80nm.
3, a kind of optical fiber grating sensing testing system that oil-gas pipeline detects that is used for according to claim 1, it is characterized in that: the fiber-optic grating sensor FBG on each check point forms fiber-optic grating sensor array 5 on the same optical fiber 7 by being distributed in, the coupling resonance centre wavelength of each fiber-optic grating sensor FBG is different and bandwidth is identical, and the spacing distance of adjacent check point is 10～20 meters.
4, according to claim 1,2,3 described a kind of optical fiber grating sensing testing systems that oil-gas pipeline detects that are used for, it is characterized in that: wideband light source array 1 is complementary with the wavelength coverage of fiber-optic grating sensor array 5, and the centre wavelength of wideband light source array 1 and wavelength bandwidth cover the coupling resonance wavelength coverage of all fiber-optic grating sensor FBG of fiber-optic grating sensor array.
5, according to claim 1,2,3,4 described a kind of optical fiber grating sensing testing systems that oil-gas pipeline detects that are used for, it is characterized in that: when single parameter measurement, at the sensor fibre grating of each check point layout to tested parameter sensitivity.
6, according to claim 1,2,3,4 described a kind of optical fiber grating sensing testing systems that oil-gas pipeline detects that are used for, it is characterized in that: when two parameter measurement, the different fiber-optic grating sensor of difference arranged alternate sensing capabilities on check point; Or arrange simultaneously that near same check point two fiber-optic grating sensors that sensing capabilities is different, the spacing of two fiber-optic grating sensors are 100 μ m～400 μ m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03264532 CN2630841Y (en) | 2003-06-18 | 2003-06-18 | Opticalfiber grating sensing and measuring system for oil-gas pipeline detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03264532 CN2630841Y (en) | 2003-06-18 | 2003-06-18 | Opticalfiber grating sensing and measuring system for oil-gas pipeline detection |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350219C (en) * | 2005-11-02 | 2007-11-21 | 浙江大学 | Method and device for multiplexing and demodulating sensor based on optical fiber grating in long cycle |
| CN100439859C (en) * | 2007-02-09 | 2008-12-03 | 北京交通大学 | Optical fiber interference type on-line micro-displacement measuring system using fibre grating |
| CN101894438A (en) * | 2009-05-20 | 2010-11-24 | 上海华魏光纤传感技术有限公司 | Positioning optical fiber vibration intrusion-detection system capable of measuring pressure |
| CN102062730A (en) * | 2010-12-20 | 2011-05-18 | 天津亿利科能源科技发展股份有限公司 | Buried oil pipeline external-corrosion real-time monitoring device based on optical fiber sensor |
| CN101395463B (en) * | 2005-09-22 | 2011-05-25 | 皇家飞利浦电子股份有限公司 | Luminescence sensor comprising at least two wire grids |
| CN102109396A (en) * | 2010-12-20 | 2011-06-29 | 天津亿利科能源科技发展股份有限公司 | On-line monitoring device for real-time stress of welding seam on buried pipeline based on optical fiber grating |
| CN108139366A (en) * | 2015-07-30 | 2018-06-08 | 天津生态城数聚空间信息技术有限公司 | Health monitor method and system based on sound emission |
| CN109270320A (en) * | 2018-10-31 | 2019-01-25 | 江苏骏龙光电科技股份有限公司 | A kind of fiber grating measuring device can be used for transmission line of electricity |
| CN109324034A (en) * | 2018-11-12 | 2019-02-12 | 中国计量大学 | Rolling bearing defect detecting device based on Oil Spectral Analysis and Magnetic Flux Leakage Inspecting |
| CN112748101A (en) * | 2020-12-29 | 2021-05-04 | 中国南方电网有限责任公司超高压输电公司柳州局 | High-altitude electric power material corrosive monitoring system based on optical fiber Raman spectrometer |
| CN114609027A (en) * | 2022-05-09 | 2022-06-10 | 武汉新能源研究院有限公司 | Transformer substation grounding grid corrosion monitoring method and system based on grating measurement technology |
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2003
- 2003-06-18 CN CN 03264532 patent/CN2630841Y/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101395463B (en) * | 2005-09-22 | 2011-05-25 | 皇家飞利浦电子股份有限公司 | Luminescence sensor comprising at least two wire grids |
| CN100350219C (en) * | 2005-11-02 | 2007-11-21 | 浙江大学 | Method and device for multiplexing and demodulating sensor based on optical fiber grating in long cycle |
| CN100439859C (en) * | 2007-02-09 | 2008-12-03 | 北京交通大学 | Optical fiber interference type on-line micro-displacement measuring system using fibre grating |
| CN101894438A (en) * | 2009-05-20 | 2010-11-24 | 上海华魏光纤传感技术有限公司 | Positioning optical fiber vibration intrusion-detection system capable of measuring pressure |
| CN102109396B (en) * | 2010-12-20 | 2012-08-22 | 天津亿利科能源科技发展股份有限公司 | On-line monitoring device for real-time stress of welding seam on buried pipeline based on optical fiber grating |
| CN102109396A (en) * | 2010-12-20 | 2011-06-29 | 天津亿利科能源科技发展股份有限公司 | On-line monitoring device for real-time stress of welding seam on buried pipeline based on optical fiber grating |
| CN102062730A (en) * | 2010-12-20 | 2011-05-18 | 天津亿利科能源科技发展股份有限公司 | Buried oil pipeline external-corrosion real-time monitoring device based on optical fiber sensor |
| CN102062730B (en) * | 2010-12-20 | 2013-06-19 | 天津亿利科能源科技发展股份有限公司 | Buried oil pipeline external-corrosion real-time monitoring device based on optical fiber sensor |
| CN108139366A (en) * | 2015-07-30 | 2018-06-08 | 天津生态城数聚空间信息技术有限公司 | Health monitor method and system based on sound emission |
| CN109270320A (en) * | 2018-10-31 | 2019-01-25 | 江苏骏龙光电科技股份有限公司 | A kind of fiber grating measuring device can be used for transmission line of electricity |
| CN109324034A (en) * | 2018-11-12 | 2019-02-12 | 中国计量大学 | Rolling bearing defect detecting device based on Oil Spectral Analysis and Magnetic Flux Leakage Inspecting |
| CN112748101A (en) * | 2020-12-29 | 2021-05-04 | 中国南方电网有限责任公司超高压输电公司柳州局 | High-altitude electric power material corrosive monitoring system based on optical fiber Raman spectrometer |
| CN112748101B (en) * | 2020-12-29 | 2024-05-10 | 中国南方电网有限责任公司超高压输电公司柳州局 | High-altitude electric power material corrosive monitoring system based on optical fiber Raman spectrometer |
| CN114609027A (en) * | 2022-05-09 | 2022-06-10 | 武汉新能源研究院有限公司 | Transformer substation grounding grid corrosion monitoring method and system based on grating measurement technology |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20051123 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |