CN111006789A - Temperature sensor of oil-immersed transformer - Google Patents
Temperature sensor of oil-immersed transformer Download PDFInfo
- Publication number
- CN111006789A CN111006789A CN201911258285.8A CN201911258285A CN111006789A CN 111006789 A CN111006789 A CN 111006789A CN 201911258285 A CN201911258285 A CN 201911258285A CN 111006789 A CN111006789 A CN 111006789A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- resistant
- pressure
- shell
- oil
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a temperature sensor of an oil-immersed transformer, which comprises an optical fiber Bragg grating, an optical fiber sleeve, an optical fiber sheath, an optical fiber bearing tube, an optical fiber sleeve fixing tube and a shell. All the materials are made of high-pressure-resistant and high-temperature-resistant non-metallic materials. The cable and the probe of the sensor can be filled with oil, so that air gaps are eliminated, and the potential hazard of discharge in a gap high-voltage environment is avoided. The sensor can be randomly attached to the surface of a measured object, and the accurate and rapid measurement in a high-pressure and high-radiation environment can be realized through the sensitivity of the optical fiber Bragg grating to the temperature, and the measurement is direct. The anti-electromagnetic interference radiation-proof device has the advantages of anti-electromagnetic interference, radiation resistance, intrinsically safe property, simple and reliable structure and the like.
Description
Technical Field
The invention relates to the technical field of temperature measuring instruments, in particular to a temperature sensor of an oil-immersed transformer.
Background
The temperature of a transformer winding plays a key role in the performance of an insulating material, the aging speed of the insulating material is accelerated due to the overhigh winding temperature, the insulating property is reduced, and the reliable operation of a transformer is influenced, so that the temperature measurement and the real-time monitoring of the transformer winding are very important, the problems of insulation, electromagnetic interference and the like need to be solved when the winding temperature is directly measured because the transformer winding is in a high potential, the winding temperature is also indirectly measured at present, a measurement system needs to be calibrated before being used, and finally the winding temperature is indirectly measured by a superposition method, so that the temperature precision of the indirect measurement system is difficult to guarantee, and the real-time performance is low.
Compared with the traditional sensor, the optical fiber Bragg grating sensor has the advantages of high sensitivity, small volume, light weight, safety, explosion prevention, strong electromagnetic interference resistance, long signal transmission distance and the like, and is particularly suitable for being applied in high-voltage high-radiation and other strong electromagnetic environments according to the characteristics of the optical fiber Bragg grating sensor technology.
Disclosure of Invention
The invention aims to provide an oil-immersed transformer temperature sensor to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an oil-immersed transformer temperature sensor, includes optic fibre Bragg grating, fiber sleeve, fiber sheath, optic fibre bearing tube, the fixed pipe of fiber sleeve, shell, optic fibre Bragg grating passes through glue behind the centre bore of optic fibre bearing tube with the hole of fiber sheath and is connected, optic fibre bearing tube surface passes through glue with fiber sleeve and is connected, and fiber sleeve passes through glue with the hole of the fixed pipe of fiber sleeve and is connected, and the inner wall of the fixed pipe outer wall of optic fibre and shell passes through glue and is connected, and fiber sheath penetrates fiber sheath, and fiber sheath penetrates the shell and fiber sheath passes through glue with the shell and is connected, the right side of optic fibre Bragg grating is provided with grid area position, and grid area position penetrates in the trombone of shell along the inside direction taper hole of shell.
Preferably, the housing is made of high-pressure-resistant and high-temperature-resistant non-metallic materials such as high-pressure-resistant and high-temperature-resistant ceramics or quartz, the cross section of the housing is square or circular, a tapered guide hole and a long hole are formed in the housing, and one or more holes capable of being communicated with the inside and the outside are formed in the housing.
Preferably, the surface of the gate region part is not coated, the left end of the gate region part is free, and the gate region part and the left end of the gate region part are not connected with any component.
Preferably, the optical fiber sleeve is of a fiber braided structure with insulation, pressure resistance and high temperature resistance.
Preferably, the optical fiber sheath is made of high-pressure-resistant and high-temperature-resistant non-metallic materials such as silicon rubber or teflon, and is a spiral protection tube, and the spiral part is communicated with the inside and the outside.
Preferably, the optical fiber bearing tube is made of an insulating, pressure-resistant and high-temperature-resistant nonmetal material such as high-pressure ceramic or quartz, and the optical fiber sleeve fixing tube is made of an insulating, pressure-resistant and high-temperature-resistant nonmetal material such as high-pressure ceramic or quartz.
Compared with the prior art, the invention has the following beneficial effects:
the optical fiber Bragg grating, the optical fiber sleeve, the optical fiber sheath, the optical fiber bearing tube, the optical fiber sleeve fixing tube and the shell are arranged, and the cable and the temperature sensing probe can be filled with oil, so that the existence of an air gap is avoided, the hidden danger problem of air gap discharge in a high-voltage environment is solved, the safety is high, the optical fiber Bragg grating works passively, the intrinsic safety is high, contact type measurement is realized, the optical fiber Bragg grating can be tightly attached to a temperature measuring point, the temperature measuring part is accurate, the temperature response is fast, the reliability is high, a sensing signal is an optical signal, the anti-interference capability is strong, the detection accuracy is high, remote monitoring can be realized, the sensing signal is a central wavelength value modulated by the Bragg grating, and the non-intensity.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the housing of the present invention in a second state;
fig. 3 is a schematic structural view of the housing of the present invention in a third state.
In the figure: the optical fiber Bragg grating optical fiber comprises 1 optical fiber Bragg grating, 101 grating region parts, 2 optical fiber sleeves, 3 optical fiber sheaths, 4 optical fiber bearing tubes, 5 optical fiber sleeve fixing tubes, 6 shells, 601 guiding taper holes, 602 long holes and 603 shell end faces.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The optical fiber Bragg grating 1, the grating region part 101, the optical fiber sleeve 2, the optical fiber sheath 3, the optical fiber bearing tube 4, the optical fiber sleeve fixing tube 5, the shell 6, the guiding taper hole 601, the long hole 602 and the shell end face 603 are all universal standard parts or parts known by a person skilled in the art, and the structure and the principle of the parts can be known by the person skilled in the art through technical manuals or conventional experimental methods.
Referring to fig. 1, a temperature sensor of an oil-immersed transformer includes an optical fiber Bragg grating 1, an optical fiber sleeve 2, an optical fiber sheath 3, an optical fiber bearing tube 4, an optical fiber sleeve fixing tube 5, and a housing 6, wherein the optical fiber Bragg grating 1 penetrates through a central hole of the optical fiber bearing tube 4 and then is connected with an inner hole of the optical fiber bearing tube 4 through PS glue, an outer surface of the optical fiber bearing tube 4 is connected with the optical fiber sleeve 2 through glue, the optical fiber sleeve 2 is connected with an inner hole of the optical fiber sleeve fixing tube 5 through glue, an outer wall of the optical fiber fixing tube 5 is connected with an inner wall of the housing 6 through glue, the optical fiber sleeve 2 penetrates into the optical fiber sheath 3, the optical fiber sheath 3 penetrates into the housing 6 and the optical fiber sheath 3 is connected with the housing 6 through glue, a grating region 101 is disposed on a right side of the optical fiber Bragg grating 1, no coating layer is disposed on a surface of the grating region 101, and the grating, the slot hole 602 is a through hole, and penetrates through the end face 603 of the housing, the optical fiber sleeve 2 is a fiber woven structure with insulation, pressure and high temperature resistance, the optical fiber sheath 3 is made of insulation, pressure and high temperature resistant non-metallic materials such as high-pressure resistant and high temperature resistant silicon rubber or Teflon, the optical fiber sheath 3 is a spiral protection tube, the spiral portion is communicated inside and outside, the optical fiber bearing tube 4 is made of insulation, pressure and high temperature resistant non-metallic materials such as high-pressure ceramic or quartz, the optical fiber sleeve fixing tube 5 is made of insulation, pressure, high temperature resistant non-metallic materials such as high-pressure ceramic or quartz, the housing 6 is made of insulation, pressure, high temperature resistant and non-.
Example two:
referring to fig. 1 and 2, an oil-immersed transformer temperature sensor includes an optical fiber Bragg grating 1, an optical fiber ferrule 2, an optical fiber sheath 3, an optical fiber bearing tube 4, an optical fiber ferrule fixing tube 5, and a housing 6, where the optical fiber Bragg grating 1 penetrates through a central hole of the optical fiber bearing tube 4 and then is connected with an inner hole of the optical fiber bearing tube 4 through glue, an outer surface of the optical fiber bearing tube 4 is connected with the optical fiber ferrule 2 through glue, the optical fiber ferrule 2 is connected with an inner hole of the optical fiber ferrule fixing tube 5 through glue, an outer wall of the optical fiber fixing tube 5 is connected with an inner wall of the housing 6 through glue, the optical fiber ferrule 2 penetrates through the optical fiber sheath 3, the optical fiber sheath 3 penetrates through the housing 6 and the housing 6 through glue, a grating region 101 is disposed on a right side of the optical fiber Bragg grating 1, no coating layer is disposed on a surface of the grating region 101, and the grating region 101 penetrates through a long hole 602 in the housing, the slot hole 602 is a through hole, and penetrates through the end face 603 of the housing, the optical fiber sleeve 2 is a fiber woven structure with insulation, pressure and high temperature resistance, the optical fiber sheath 3 is made of insulation, pressure and high temperature resistant non-metallic materials such as high-pressure resistant and high temperature resistant silicon rubber or Teflon, the optical fiber sheath 3 is a spiral protection tube, the spiral portion is communicated with the inside and the outside, the optical fiber bearing tube 4 is made of insulation, pressure, high temperature resistant non-metallic materials such as high-pressure ceramic or quartz, the optical fiber sleeve fixing tube 5 is made of insulation, pressure, high temperature resistant non-metallic materials such as high-pressure ceramic or quartz, the housing 6 is made of insulation, pressure, high temperature resistant and high temperature resistant non-metallic materials such as high-pressure resistant and.
Example three:
referring to fig. 1 and 3, an oil-immersed transformer temperature sensor includes an optical fiber Bragg grating 1, an optical fiber ferrule 2, an optical fiber sheath 3, an optical fiber bearing tube 4, an optical fiber ferrule fixing tube 5, and a housing 6, wherein the optical fiber Bragg grating 1 penetrates through a central hole of the optical fiber bearing tube 4 and then is connected with an inner hole of the optical fiber bearing tube 4 through glue, an outer surface of the optical fiber bearing tube 4 is connected with the optical fiber ferrule 2 through glue, the optical fiber ferrule 2 is connected with an inner hole of the optical fiber ferrule fixing tube 5 through glue, an outer wall of the optical fiber fixing tube 5 is connected with an inner wall of the housing 6 through glue, the optical fiber ferrule 2 penetrates into the optical fiber sheath 3, the optical fiber sheath 3 penetrates into the housing 6 and the housing 6 is connected through glue, a grating region 101 is disposed on a right side of the optical fiber Bragg grating 1, no coating layer is disposed on a surface of the grating region 101, and the grating region 101 penetrates into a long hole 602 in, the long hole 602 is a blind hole, the optical fiber sleeve 2 is an insulating, pressure-resistant and high-temperature-resistant fiber woven structure, the optical fiber sheath 3 is made of insulating, pressure-resistant and high-temperature-resistant nonmetal materials such as high-pressure-resistant and high-temperature-resistant silicon rubber or Teflon, the optical fiber sheath 3 is a spiral protection tube, the spiral line part is communicated with the inside and the outside, the optical fiber bearing tube 4 is made of insulating, pressure-resistant and high-temperature-resistant nonmetal materials such as high-pressure ceramic or quartz, the optical fiber sleeve fixing tube 5 is made of insulating, pressure-resistant and high-temperature-resistant nonmetal materials such as high-pressure ceramic or quartz, the shell 6 is made of insulating, pressure-resistant, high-temperature-resistant nonmetal materials such as high-.
According to the coupled-mode theory, the central reflection wavelength of the fiber Bragg grating 1 can be expressed as:
（1）
the effective refractive index of the guided mode is shown in the formula (1), and the period of the grating is shown in the formula (1), the central reflection wavelength is related to the effective refractive index and the grating period, and the effective refractive index and the grating period can change along with the change of temperature, pressure and strain, so that the change of temperature, pressure, strain and the like can be measured according to the change of the central reflection wavelength.
When the fiber Bragg grating 1 is influenced by axial external force and temperature, the grating period and the refractive index of a fiber core of the fiber Bragg grating 1 will change, the reflection wavelength of the fiber Bragg grating 1 will also change, and the relation is as follows:
（2）
for equation (2), assuming that only temperature changes, the grating period change due to thermal expansion effects is:
（3）
where the coefficient of thermal expansion of the fiber, the thermo-optic coefficient causes a change in the effective index of refraction to:
（4）
the formula is a thermo-optic coefficient of the optical fiber and represents a change rate of the refractive index with temperature.
Therefore, the relationship between the reflection wavelength variation and the temperature variation of the fiber Bragg grating 1 can be obtained:
（5）
as can be seen from the equation (5), there is a one-to-one correspondence relationship between the reflection wavelength variation and the temperature variation of the fiber Bragg grating 1, and therefore the temperature variation can be obtained by detecting and analyzing the reflection wavelength variation of the fiber Bragg grating 1.
When in use, people clamp or glue the shell 6 to be tightly attached to the measured position, oil can enter the guiding taper hole 601 and the long hole 602, so that the grid region part 101 of the optical fiber Bragg grating 1 is positioned in the oil communicated with the outside, the temperature of the surrounding oil can be sensed in time, meanwhile, oil can permeate into the optical fiber sleeve 2 from the spiral line on the optical fiber sheath 3, the optical fiber sleeve 2 with the fiber braided structure can permeate the oil, so that the cable is internally filled with the oil, the air gap in the cable is eliminated, because the probe and the cable are filled with oil to eliminate air gaps, the hidden trouble problem of air gap discharge in a high-voltage environment is solved, the safety is high, the optical fiber Bragg grating works passively and is intrinsically safe, the remote sensing device has the advantages of high reliability, strong anti-interference capability and high detection accuracy, sensing signals are optical signals, remote monitoring can be realized, and remote measurement can be realized because the sensing signals are Bragg grating modulated center wavelength values rather than intensity values.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an oil-immersed transformer temperature sensor, includes optic fibre Bragg grating (1), bars district position (101), fiber sleeve (2), fiber sheath (3), optic fibre holds tub (4), fixed pipe of fiber sleeve (5), shell (6), its characterized in that: the optical fiber Bragg grating is characterized in that the optical fiber Bragg grating (1) penetrates out of a center hole of the optical fiber bearing tube (4) and then is connected with an inner hole of the optical fiber bearing tube (4) through glue, the outer surface of the optical fiber bearing tube (4) is connected with the optical fiber sleeve (2) through glue, the optical fiber sleeve (2) is connected with the inner hole of the optical fiber sleeve fixing tube (5) through glue, the outer wall of the optical fiber fixing tube (5) is connected with the inner wall of the shell (6) through glue, the optical fiber sleeve (2) penetrates into the optical fiber sheath (3), the optical fiber sheath (3) penetrates into the shell (6) and is connected with the shell (6) through glue, a grating area part (101) is arranged on the right side of the optical fiber Bragg grating (1), and the grating area part (101) penetrates into a long hole (602) in the shell (6) along a guiding taper hole (601) in.
2. An oil-filled transformer temperature sensor according to claim 1, characterized in that: the shell (6) is made of high-pressure-resistant and high-temperature-resistant non-metallic materials such as high-pressure-resistant and high-temperature-resistant ceramics or quartz, the cross section of the shell (6) is square or circular, a conical guide hole and a long hole are formed in the shell, and meanwhile, one or more holes which can be communicated with each other inside and outside are formed in the shell (6).
3. An oil-filled transformer temperature sensor according to claim 1, characterized in that: the surface of the grid region part (101) is not provided with a coating layer, one end of the grid region part (101) is free, and the other end of the grid region part is fixed.
4. An oil-filled transformer temperature sensor according to claim 1, characterized in that: the optical fiber sleeve (2) is of an insulating, pressure-resistant and high-temperature-resistant fiber woven structure.
5. An oil-filled transformer temperature sensor according to claim 1, characterized in that: the optical fiber sheath (3) is made of high-pressure-resistant and high-temperature-resistant non-metallic materials such as silicon rubber or Teflon which are insulated and pressure-resistant, and the optical fiber sheath (3) is a spiral protection tube, and the spiral part is communicated with the inside and the outside.
6. An oil-filled transformer temperature sensor according to claim 1, characterized in that: the optical fiber bearing tube (4) is made of insulating, pressure-resistant and high-temperature-resistant nonmetal materials such as high-voltage ceramic or quartz, and the optical fiber sleeve fixing tube (5) is made of insulating, pressure-resistant and high-temperature-resistant nonmetal materials such as high-voltage ceramic or quartz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911258285.8A CN111006789A (en) | 2019-12-10 | 2019-12-10 | Temperature sensor of oil-immersed transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911258285.8A CN111006789A (en) | 2019-12-10 | 2019-12-10 | Temperature sensor of oil-immersed transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111006789A true CN111006789A (en) | 2020-04-14 |
Family
ID=70114195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911258285.8A Pending CN111006789A (en) | 2019-12-10 | 2019-12-10 | Temperature sensor of oil-immersed transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111006789A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630897A (en) * | 2020-11-29 | 2021-04-09 | 西安和其光电科技股份有限公司 | Temperature measurement optic fibre switching module and take temperature measurement optic fibre switching module's transformer |
| CN112964386A (en) * | 2021-02-23 | 2021-06-15 | 山东省科学院激光研究所 | Optical fiber FP resonant cavity temperature sensor and manufacturing method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162867A (en) * | 2013-02-28 | 2013-06-19 | 辽宁省电力有限公司营口供电公司 | Fiber optic temperature sensor for oil-immersed transformer winding |
| CN205539627U (en) * | 2016-02-26 | 2016-08-31 | 深圳市恒捷丰光电科技有限公司 | Can improve cable configuration that receives force intensity |
| US20160252401A1 (en) * | 2013-08-23 | 2016-09-01 | Abb Inc. | Oil-immersed transformer thermal monitoring and prediction system |
| CN106153214A (en) * | 2016-07-20 | 2016-11-23 | 深圳先进技术研究院 | For the temperature sensor within oil-immersed type transformer and manufacture method thereof |
| CN108917803A (en) * | 2018-08-08 | 2018-11-30 | 西安交通大学 | A kind of preparation method of the distributed high-temperature resistant optical fiber grating sensor based on metal coated fiber |
-
2019
- 2019-12-10 CN CN201911258285.8A patent/CN111006789A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162867A (en) * | 2013-02-28 | 2013-06-19 | 辽宁省电力有限公司营口供电公司 | Fiber optic temperature sensor for oil-immersed transformer winding |
| US20160252401A1 (en) * | 2013-08-23 | 2016-09-01 | Abb Inc. | Oil-immersed transformer thermal monitoring and prediction system |
| CN205539627U (en) * | 2016-02-26 | 2016-08-31 | 深圳市恒捷丰光电科技有限公司 | Can improve cable configuration that receives force intensity |
| CN106153214A (en) * | 2016-07-20 | 2016-11-23 | 深圳先进技术研究院 | For the temperature sensor within oil-immersed type transformer and manufacture method thereof |
| CN108917803A (en) * | 2018-08-08 | 2018-11-30 | 西安交通大学 | A kind of preparation method of the distributed high-temperature resistant optical fiber grating sensor based on metal coated fiber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630897A (en) * | 2020-11-29 | 2021-04-09 | 西安和其光电科技股份有限公司 | Temperature measurement optic fibre switching module and take temperature measurement optic fibre switching module's transformer |
| CN112964386A (en) * | 2021-02-23 | 2021-06-15 | 山东省科学院激光研究所 | Optical fiber FP resonant cavity temperature sensor and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2964508C (en) | Array temperature sensing method and system | |
| CN106052912A (en) | Optical fiber stress sensing device based on Fabry-Perot microcavity structure | |
| CN101995485B (en) | Target fiber grating rheometer | |
| CN111006789A (en) | Temperature sensor of oil-immersed transformer | |
| CN207147667U (en) | A kind of back-shaped strip sensor of carbon fiber prepreg encapsulation | |
| CN109115118A (en) | A kind of transformer winding detection system based on distributing optical fiber sensing | |
| CN102564504B (en) | Multi-section distributed fiber grating hot-type flow sensor | |
| CN208818367U (en) | A kind of fiber grating temperature sensor | |
| CN108088584A (en) | Reflection-type optical fiber temperature sensor and preparation method thereof | |
| Ansari et al. | Preliminary assessment of using optical fibre sensors to measure moisture in transformers | |
| CN207895123U (en) | A kind of temperature measuring optical cable | |
| CN102538892B (en) | Single-section distributed FBG (fiber Bragg grating)-thermal flow sensor | |
| CN202994328U (en) | Fiber grating sensor | |
| CN112964857B (en) | Soil matrix suction monitoring device and method based on fiber bragg grating | |
| CN103852190A (en) | Fiber bragg grating sensor for measuring temperature in ArF excimer laser cavity | |
| RU2552399C1 (en) | Distributed fiber optical high sensitivity temperature sensor | |
| CN107945981A (en) | A kind of intelligent mariages circulating type monitoring temperature single-core cable based on fiber grating | |
| Gottlieb et al. | Measurement of temperature with optical fibers | |
| CN211824802U (en) | High-voltage-resistant anti-electromagnetic interference temperature sensor | |
| CN208350235U (en) | A kind of long period fiber-optical grating temperature sensor based on fiber annular cavity-type BPM | |
| CN201100851Y (en) | An optical fiber grating temperature sensor | |
| CN101183480A (en) | Optical fibre type linear temperature-sensitive detector | |
| Wang et al. | Research on application of distributed FBG in on-line temperature sensing of power transformer | |
| CN205861260U (en) | A kind of sensor for crustal stress on-line monitoring | |
| KR101223105B1 (en) | Multi-points Temperature Measuring Equipment by using Optical Fiber Censor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200414 |
|
| RJ01 | Rejection of invention patent application after publication |