CN220251217U - Integrated optical fiber temperature sensing engineering wall monitoring system - Google Patents
Integrated optical fiber temperature sensing engineering wall monitoring system Download PDFInfo
- Publication number
- CN220251217U CN220251217U CN202320993528.8U CN202320993528U CN220251217U CN 220251217 U CN220251217 U CN 220251217U CN 202320993528 U CN202320993528 U CN 202320993528U CN 220251217 U CN220251217 U CN 220251217U
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- temperature sensing
- temperature
- fiber
- distributed
- 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.)
- Active
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 103
- 238000012544 monitoring process Methods 0.000 title claims abstract description 26
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000005253 cladding Methods 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 10
- 238000001069 Raman spectroscopy Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model provides an integrated optical fiber temperature sensing engineering wall monitoring system, and relates to the field of distributed optical fiber sensing. This integrated optic fibre temperature sensing engineering wall body monitoring system includes: a distributed temperature sensor; the temperature sensing optical fiber assembly comprises a special temperature optical fiber and a multimode optical fiber, wherein the special temperature optical fiber and the multimode optical fiber are welded, and the special temperature optical fiber is distributed on an object to be measured; and the integrated optical switch assembly is provided with a plurality of single optical switches, the single optical switches are in a tree structure, the single optical switches positioned at the topmost end of the tree structure are electrically connected with the distributed temperature sensor, and the single optical switches positioned at the bottommost end of the tree structure are electrically connected with the temperature sensing optical fiber assembly. The problem that 30 meters or even longer data at the tail end of an optical fiber are always omitted when the distributed temperature sensing instrument is used for measuring is solved, so that the measurement accuracy is guaranteed, the armored optical fiber is wasted, and the monitoring cost is increased is solved.
Description
Technical Field
The utility model relates to the technical field of distributed optical fiber sensing, in particular to an integrated optical fiber temperature sensing engineering wall monitoring system.
Background
The optical fiber sensing technology is a novel sensing technology which is rising along with the development of optical fiber technology and optical fiber communication technology in the 70 th century. Because the optical fiber has the advantages of small volume, light weight, good electromagnetic and radiation interference resistance, easy bending and the like, the optical fiber is suitable for being used in severe environments such as inflammable and explosive, severely limited space, strong electromagnetic infection and the like. The distributed optical fiber sensing has the outstanding advantages, so that the technology has good adaptability in practical application, can meet various requirements, and provides a reliable means for safety monitoring in engineering. Therefore, distributed optical fiber sensing technology has been developed and widely used.
The sensing optical fiber required by the distributed temperature sensing instrument is a multimode optical fiber, and in some projects, an armored optical fiber suitable for the project needs to be customized, so that the manufacturing cost is high. Because of various scattering and nonlinear effects at the end of the multimode fiber, the returned signal can be interfered by the multimode fiber to influence the positioning accuracy and the temperature measurement accuracy. Therefore, the distributed temperature sensing instrument often omits data of 30 meters or more at the tail end of the optical fiber during measurement, so that the measurement accuracy is ensured. This results in waste of armored fiber and thus increases monitoring costs.
Disclosure of Invention
Aiming at the defects of the prior art, the disclosed aim is to provide an integrated optical fiber temperature sensing engineering wall monitoring system, which solves the problems that a distributed temperature sensing instrument always omits 30 meters or even longer data at the tail end of an optical fiber during measurement, so that the accuracy of measurement is ensured, the armored optical fiber is wasted, and the monitoring cost is increased.
The purpose of the disclosure can be achieved by the following technical scheme:
an integrated fiber optic temperature sensing engineering wall monitoring system comprising:
a distributed temperature sensor;
the temperature sensing optical fiber assembly comprises a special temperature optical fiber and a multimode optical fiber, wherein the special temperature optical fiber and the multimode optical fiber are welded, and the special temperature optical fiber is distributed on an object to be measured; and
the integrated optical switch assembly comprises a plurality of single optical switches, the plurality of single optical switches are in a tree structure, the single optical switches located at the topmost end of the tree structure are electrically connected with the distributed temperature sensor, and the single optical switches located at the bottommost end of the tree structure are electrically connected with the temperature sensing optical fiber assembly.
The technical scheme has the following principle and effects:
after the temperature sensing optical fiber is used, the tail end of the optical fiber is a common multimode optical fiber which is only used for generating nonlinear scattering but not used for temperature sensing, the influence of the tail end scattering is controlled in the common multimode optical fiber, and the price of the common multimode optical fiber is only one tenth or even one hundredth of that of the special temperature optical fiber. The construction of a standard subway station needs about 100 underground continuous walls, if a novel temperature optical fiber is used for monitoring four prisms of the underground continuous walls, the special optical fiber of 12Km can be saved, and the monitoring cost of tens of thousands of yuan is reduced. And the more the number of parts intercepted by the optical fiber is, the more the cost is saved;
meanwhile, the number of interfaces of the distributed optical fiber sensing instrument is limited, and generally one instrument is provided with 4 to 8 interfaces, which means that only 4 to 8 optical fibers can be monitored at the same time. The integrated optical switch structure is designed to measure a plurality of objects (about 200-800 paths of optical fiber channels) in a time-sharing manner by switching the optical fiber measuring channels, so that reasonable resource allocation is promoted, the resource utilization rate is greatly improved, and the cost for purchasing a plurality of instruments for monitoring can be saved.
Preferably, the special temperature optical fiber comprises a shell, a copper net is arranged in the shell, a fiber core I is arranged in the middle of the shell, and a cladding I is sleeved outside the fiber core I.
Preferably, the multimode optical fiber comprises a protective layer, a second fiber core is arranged in the middle of the protective layer, and a second cladding is sleeved on the outer side of the fiber core.
Preferably, the end of the first core of the special-temperature optical fiber is aligned with the end of the second core of the multimode optical fiber and welded.
Preferably, the single light-emitting device at the bottommost end of the tree structure is electrically connected with the special temperature optical fiber in the temperature sensing optical fiber assembly.
The beneficial effects of the present disclosure are:
the utility model provides an integrated optical fiber temperature sensing engineering wall monitoring system, which realizes real-time monitoring of a plurality of structures to be detected under the condition of not reducing the sensing distance and the temperature measuring performance of an instrument, saves the use cost of an optical cable, reasonably configures resources and improves the utilization rate of the resources.
Drawings
FIG. 1 is a schematic diagram of an integrated fiber temperature sensing engineering wall monitoring system according to the present utility model;
FIG. 2 is a block diagram of a temperature sensing fiber optic assembly of the present utility model.
Wherein, 1, a distributed temperature sensor; 2. an integrated optical switch assembly; 3. a single optical switch; 4. tailoring a temperature optical fiber; 401. a housing; 402. a copper mesh; 403. a first fiber core; 404. a first cladding layer; 5. a multimode optical fiber; 501. a protective layer; 502. a fiber core II; 503. and a second cladding layer.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Examples
Referring to fig. 1 to 2, an integrated optical fiber temperature sensing engineering wall monitoring system includes:
a distributed temperature sensor 1;
the temperature sensing optical fiber assembly comprises a special temperature optical fiber 4 and a multimode optical fiber 5, wherein the special temperature optical fiber 4 and the multimode optical fiber 5 are welded, and the special temperature optical fiber 4 is distributed on an object to be measured; and
the integrated optical switch assembly 2 comprises a plurality of single optical switches 3, wherein the plurality of single optical switches 3 are in a tree structure, single light-on devices positioned at the top end of the tree structure are electrically connected with the distributed temperature sensor 1, and single light-on devices positioned at the bottom end of the tree structure are electrically connected with the temperature sensing optical fiber assembly.
The technical scheme has the following principle and effects:
after the temperature sensing optical fiber is used, the tail end of the optical fiber is a common multimode optical fiber 5 which is only used for generating nonlinear scattering and is not used for temperature sensing, the influence of the tail end scattering is controlled in the common multimode optical fiber 5, and the price of the common multimode optical fiber 5 is only one tenth or even one hundredth of that of the special temperature optical fiber 4. The construction of a standard subway station needs about 100 underground continuous walls, if a novel temperature optical fiber is used for monitoring four prisms of the underground continuous walls, the special optical fiber of 12Km can be saved, and the monitoring cost of tens of thousands of yuan is reduced. And the more the number of parts intercepted by the optical fiber is, the more the cost is saved;
meanwhile, the number of interfaces of the distributed optical fiber sensing instrument is limited, and generally one instrument is provided with 4 to 8 interfaces, which means that only 4 to 8 optical fibers can be monitored at the same time. The integrated optical switch structure is designed to measure a plurality of objects (about 200-800 paths of optical fiber channels) in a time-sharing manner by switching the optical fiber measuring channels, so that reasonable resource allocation is promoted, the resource utilization rate is greatly improved, and the cost for purchasing a plurality of instruments for monitoring can be saved.
Further, the special temperature optical fiber 4 comprises a housing 401, a copper net 402 is arranged in the housing 401, a fiber core I403 is arranged in the middle of the housing 401, and a cladding I404 is sleeved outside the fiber core I403.
Further, the multimode optical fiber 5 includes a protective layer 501, a second core 502 is disposed in the middle of the protective layer 501, and a second cladding 503 is sleeved outside the second core 502.
Further, the end of the first core 403 of the specially-manufactured temperature optical fiber 4 is aligned with and welded to the end of the second core 502 of the multimode optical fiber 5, so that optical loss and interference signals caused by misalignment of the cores are avoided.
Further, the single lights at the bottommost end of the tree structure are electrically connected with the special temperature optical fibers 4 in the temperature sensing optical fiber assembly.
At present, the distributed optical fiber sensing technology is mainly divided into two types, one is the distributed optical fiber sensing technology based on Raman scattering, and the other is the distributed optical fiber sensing technology based on Brillouin scattering. Because raman scattering is insensitive to external strain and is accurate and stable in temperature measurement, the distributed optical fiber sensing technology based on raman scattering is mainly used for temperature sensing. Raman scattering can be seen as the interaction of incident light with a medium molecule, the incident laser light reacts with the medium molecule, the incident photon is scattered by the molecule into another low-frequency stokes raman photon or a high-frequency stokes raman photon, the corresponding molecule completes the transition between two vibrational states, one phonon is released to become a stokes raman scattered photon, and one phonon is absorbed to become an anti-stokes raman scattered photon. The number of particles at the molecular level of the fiber follows the boltzmann distribution, the ratio I (T) of anti-stokes light intensity to stokes light intensity:
where h is planck constant, h= 6.626 ×10 -23 J.S; deltav is 1.32X10 13 ；k B Is Boltzmann constant, k B ＝1.380×10 -23 J·K -1 The method comprises the steps of carrying out a first treatment on the surface of the T is the thermodynamic temperature. From equation (1), it can be seen that the temperature data across the fiber can be obtained from the anti-stokes to stokes intensity ratio. The relation between the raman intensity ratio F (T) and the temperature is:
in actual measurement, phi can be obtained AS (T)，φ S (T)，φ AS (T 0 )，φ S (T 0 ) The level value after photoelectric conversion can be used for measuring the actual temperature value of the optical fiber according to the formula (3).
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (5)
1. An integrated fiber optic temperature sensing engineering wall monitoring system, comprising:
a distributed temperature sensor (1);
the temperature sensing optical fiber assembly comprises a special temperature optical fiber (4) and a multimode optical fiber (5), wherein the special temperature optical fiber (4) and the multimode optical fiber (5) are welded, and the special temperature optical fiber (4) is distributed on an object to be measured; and
the integrated optical switch assembly (2) comprises a plurality of single optical switches (3), wherein the single optical switches (3) are in a tree structure, the single optical switches (3) located at the top end of the tree structure are electrically connected with the distributed temperature sensor (1), and the single optical switches (3) located at the bottom end of the tree structure are electrically connected with the temperature sensing optical fiber assembly.
2. An integrated fiber optic temperature sensing engineering wall monitoring system according to claim 1, wherein: the special temperature optical fiber (4) comprises a shell (401), a copper net (402) is arranged in the shell (401), a fiber core I (403) is arranged in the middle of the shell (401), and a cladding I (404) is sleeved outside the fiber core I (403).
3. An integrated fiber optic temperature sensing engineering wall monitoring system according to claim 2, wherein: the multimode optical fiber (5) comprises a protective layer (501), a fiber core II (502) is arranged in the middle of the protective layer (501), and a cladding II (503) is sleeved outside the fiber core II (502).
4. An integrated fiber optic temperature sensing engineering wall monitoring system according to claim 3, wherein: the end of the first fiber core (403) of the special temperature optical fiber (4) is aligned with the end of the second fiber core (502) of the multimode optical fiber (5) and welded.
5. An integrated fiber optic temperature sensing engineering wall monitoring system according to claim 1, wherein: the single optical switches (3) positioned at the bottommost end of the tree structure are electrically connected with the special temperature optical fibers (4) in the temperature sensing optical fiber assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320993528.8U CN220251217U (en) | 2023-04-27 | 2023-04-27 | Integrated optical fiber temperature sensing engineering wall monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320993528.8U CN220251217U (en) | 2023-04-27 | 2023-04-27 | Integrated optical fiber temperature sensing engineering wall monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220251217U true CN220251217U (en) | 2023-12-26 |
Family
ID=89230413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320993528.8U Active CN220251217U (en) | 2023-04-27 | 2023-04-27 | Integrated optical fiber temperature sensing engineering wall monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220251217U (en) |
-
2023
- 2023-04-27 CN CN202320993528.8U patent/CN220251217U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104330101A (en) | Optical fiber sensor capable of measuring temperatures and micrometric displacement simultaneously | |
| CN103148956B (en) | One carries out thermometric device and method based on coating micro-nano fiber | |
| CN101995485B (en) | Target fiber grating rheometer | |
| CN104316106A (en) | Optical fiber sensor based on Mach-Zehnder interference and fiber bragg grating | |
| CN201974251U (en) | Distributed optical fiber online temperature monitoring system for electric power cable | |
| CN103076108A (en) | Novel power cable conductor temperature measuring sensor based on FBG (fiber bragg grating) | |
| CN201707750U (en) | Gaseous spectrum absorption box and temperature control grating and combined fiber grating fire hazard warning system | |
| CN201903411U (en) | Power equipment temperature online monitoring system based on fiber bragg grating temperature sensor | |
| CN209606320U (en) | All -fiber humidity sensing device | |
| CN203224440U (en) | Humidity sensor based on multimode interference MSM (multilayer switch module) structure | |
| CN105387968A (en) | Optical fiber cladding surface Bragg grating temperature self-compensating pressure sensor | |
| CN103453940A (en) | Optical fiber sensor based on multi-mode structure | |
| CN220251217U (en) | Integrated optical fiber temperature sensing engineering wall monitoring system | |
| CN206192392U (en) | Adopt dry wet process temperature and humidity sensing probe of fiber bragg grating sensor ware | |
| CN201945404U (en) | Sensor based on three-degree inclined multimode fiber bragg grating (MFBG) for measuring temperature and refractive index simultaneously | |
| CN102539011B (en) | Temperature sensor based on phosphor-doped fiber radiation induced attenuation thermosensitivity | |
| CN203785642U (en) | All-fiber bending sensor based on peanut-shaped structure | |
| CN203772449U (en) | Fiber temperature-measuring tape with high spatial resolution | |
| CN200972732Y (en) | Optical fibre and optical fibre raster experimental instrument | |
| CN201000371Y (en) | Portable electric equipment temperature detecting system with optical fiber grating sensor and sensor thereof | |
| CN102620861A (en) | Scaling temperature measuring device in distributed optical fiber temperature sensor | |
| CN113091991B (en) | Slip casting pressure monitoring system based on OFDR and Flex sensor | |
| CN202511919U (en) | Fiber grating array temperature transmitter based on relative strength edge filtering method | |
| CN109141487A (en) | A kind of distributed fiberoptic sensor | |
| Zhao et al. | Curvature and shape distributed sensing using Brillouin scattering in multi-core fibers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |