CN107167263B - Running water pipe leakage detection experiment platform based on optical fiber Raman temperature sensor - Google Patents
Running water pipe leakage detection experiment platform based on optical fiber Raman temperature sensor Download PDFInfo
- Publication number
- CN107167263B CN107167263B CN201710379580.3A CN201710379580A CN107167263B CN 107167263 B CN107167263 B CN 107167263B CN 201710379580 A CN201710379580 A CN 201710379580A CN 107167263 B CN107167263 B CN 107167263B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- detection
- temperature sensor
- water pipe
- pipe leakage
- 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
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
-
- 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
- G01K11/324—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 using Raman scattering
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention discloses a kind of running water pipe leakage detection experiment platform based on optical fiber Raman temperature sensor, it includes: water circulation system, signal amplifying system and optical fiber Raman temperature sensor, make simcity running water pipe leakage situation in laboratory environments by water circulation system, and by the way that temperature signal is further amplified in the conversion layer of detection pipeline external setting, in order to the detection of optical fiber Raman temperature sensor, the present invention is of great significance for further designing pipe leakage alarm system and improving optical fiber Raman temperature sensor, and it is created condition for the application of optical fiber Raman temperature sensor.
Description
Technical field
The invention belongs to field of non destructive testing more particularly to a kind of running water pipe based on optical fiber Raman temperature sensor to let out
Leak detection experiment porch.
Background technique
Currently, city water pipeline is criss-cross, waterpipe incident of leakage also occurs often, for city water cycle system
For system, the leakage of water pipe often brings big inconvenience to people's lives, and the on-line monitoring of water pipe and detection are also always
Since be all valued by people, in pipe leakage event, by between pipeline junction occur throughout the year it is in bad repair, loss etc. institutes
Caused by incident of leakage also occur often, if be able to achieve to examinations at waterpipe junction or water pipe rapid wear and online
Monitoring checks erroneous ideas at the outset in this way once pipe leakage occurs can make counter-measure in time, and it is raw to people to reduce pipe leakage
Bring living is inconvenient, therefore providing one kind the present invention is based on distributed optical fiber Raman temperature sensor can be to pipe leakage reality
The device for applying on-line monitoring and detection, application and development for distributed optical fiber Raman temperature sensor have important meaning
Justice.With the further development and improvement of distributed optical fiber Raman temperature sensor technology, distributed fiber Raman temperature sensing
The temperature measurement error and spatial resolution of device detection all have reached very high precision, since distributed fiberoptic sensor has body
Small, the embeddable, shape variable of product, light weight and cost be low, it is non-conductive, high pressure resistant, can be safely operated in harmful environment, instead
The characteristics such as fast, anticorrosive are answered, have various types of distributed fiberoptic sensor products applications both at home and abroad at present in power grid, iron
Road, bridge etc., however the variation of the ambient temperature environment due to caused by the leakage of water pipe is not it is obvious that therefore for waterpipe
Detection can't directly be applied with a series of products based on distributed optical fiber Raman temperature sensor for on-line monitoring and water
The leak detection and on-line monitoring of pipeline, so if it to be distributed light that the temperature signal that water leaks can be further amplified to this
Fine temperature sensor is applied to be of great significance in the detection and on-line monitoring of waterpipe.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide it is a kind of based on optical fiber Raman temperature sensor from
Carry out water pipe leakage detection experiment platform.
To achieve the purpose of the present invention, be achieved using following technical scheme: one kind is based on fiber Raman temperature sensing
The running water pipe leakage detection experiment platform of device, it is used to solve the problems, such as that detection and the on-line monitoring of pipe leakage, including water to follow
Loop system, signal amplifying system and optical fiber Raman temperature sensor；
Water circulation system includes water storage cylinder, power device and detection pipeline, and the water storage cylinder and power device connect by first
Adapter tube connection, the power device are connect with detection pipeline by the second connecting tube, and the detection pipeline and water storage cylinder pass through drainpipe
Connection；
Signal amplifying system includes the conversion layer for being covered on detection pipeline detection position, and is coated on outside conversion layer
Separation layer is additionally provided with environmental chamber in the outside of the separation layer, which is conversion zone in subaerial side, this is anti-
Answer the inside of layer water-tight, outside can seep water；
Optical fiber Raman temperature sensor includes: Laser emission end, and the bidirectional coupler being connected with Laser emission end, this is two-way
Coupler is connected with calibration optical fiber one end, the other end connecting detection optical fiber of the calibration optical fiber, the end setting of the detection fiber
There is Faraday rotation lens device, meanwhile, bidirectional coupler is connected with light wavelength division multiplexing, the light wavelength division multiplexing and signal processing
Device is connected, which is connected with display；The inside of detection fiber abutting conversion zone.
Further, flow rate regulating valve is provided in first connecting tube, the both ends of the detection pipeline are respectively set
There are the first connecting flange and the second connecting flange, is provided with adjustable stomata valve on the detection pipeline.
Further, the outside of the conversion zone is set at a distance from least 1 centimetre with the bottom end of the separation layer.
Further, the environmental chamber top cover being arranged outside the separation layer is detachable.
Further, the detection fiber is both transmission fiber and sensor fibre.
The beneficial effects of the present invention are:
1, water circulation system is constituted by water vat, power device due to the present invention, it in this way can be for analog detection water pipe
The experiment of road leakage is created condition in laboratory environments；
2, since the present invention arranges conversion layer outside detection pipeline, while the bottom of the conversion layer is provided with conversion zone,
The conversion zone is made using special media, the special media encounter detection pipeline internal liquid when can distribute amount of heat from
And ambient enviroment is caused to be brought rapidly up, it will lead to the conversion layer when detecting the liquid leakage in pipeline in this way and discharge big calorimetric
Amount causes the temperature field around detection fiber that significant changes occur, since the variation meeting modulation optical fiber in temperature field is in Raman scattering
Intensity, liquid leakage signal is converted to apparent temperature change signal, this just for detection provide convenience；
3, heretofore described conversion layer subaerial side in setting is provided with conversion zone, the inside of the conversion zone
Be made of water-tight material, the outside of the conversion zone is made of the material that can be seeped water, and the outside of the conversion zone with every
The bottom end of absciss layer sets at least 1 centimetre of distance, and the inside for being close to above-mentioned conversion zone is arranged in the detection fiber；
Since the conversion zone setting being arranged on conversion layer is in side near the ground, no matter water pipe which side leak, due to weight
Power principle can all flow to bottom and further react with conversion zone；Only it need to arrange that a detection fiber can be detected accurately in this way
Leakage problem；
Since the inside of the conversion zone is water-tight, even if waterpipe wall is due to environment reason (example: summer air water pipe to the cold
Lead to there is droplet to be attached to the case where its surface will not cause the temperature of conversion zone to change, reduce erroneous judgement generation；
Since the outside of the conversion zone is set at a distance from least 1 centimetre with the bottom end of above-mentioned separation layer, only work as in this way
Cause the water surface elevation of bottom in separation layer that can just to react when being more than 1 centimetre of the separation layer bottom end when water pipe leaks
The medium of layer meets water reaction and temperature change occurs, and improves the accuracy of detection；
4, due to detecting the separation layer for being wrapped in above-mentioned conversion layer and fibre optic temperature sensor on the outside of pipeline, this
Preventing environmental liquids from penetrating into bring influences, and creates condition for the accuracy of the collected data of fibre optic temperature sensor；
It 5, is just in this way experiment simulation pipeline due to being also provided with dismountable environmental chamber outside above-mentioned separation layer
Outer wall environmental creation condition；Simultaneously because having set stomata valve in detection pipeline peripheral hardware, water pipe larger flow can be not only imitated
Leakage environment, also be adjusted stomata valve imitate the smaller flow of water pipe osmotic condition.
These have important meaning for further designing pipe leakage alarm system and improving optical fiber Raman temperature sensor
Justice, and created condition for the application of optical fiber Raman temperature sensor.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention.
Fig. 2 is detecting system schematic diagram of the invention.
In figure, 1, water storage cylinder；2, the first connecting tube；3, flow rate regulating valve；4, power device；5, the second connecting tube；6,
One connecting flange；7, environmental chamber；8, separation layer；9, conversion layer；10, stomata valve；11, conversion zone；12, optical fiber is calibrated；13,
Detection fiber；14, faraday rotation mirror；15, Laser emission end；16, bidirectional coupler；17, light wavelength division multiplexing；18, signal
Processor；19, display；20, the second connecting flange；21, drainpipe；P, pipeline is detected.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, a kind of running water pipe leak detection based on optical fiber Raman temperature sensor provided by the invention is real
Test platform, including water circulation system, signal amplifying system and optical fiber Raman temperature sensor；
Water circulation system includes water storage cylinder 1, power device 4 and detection pipeline P, and connects the water storage cylinder 1 and power dress
Set 4 the first connecting tube 2, the second connecting tube 5 of connecting power device 4 and detection pipeline P, connecting detection pipeline P and water storage cylinder 1
Drainpipe 21.
The water storage cylinder 1 using glass system grow up 100 centimetres, it is 50 centimetres wide, 50 centimetres high, with a thickness of 1 centimetre of nothing
Lid cube water storage cylinder, power device 4 are replaced using micro pump (12V), the first connecting tube 2, the second connecting tube 5, detection pipe
The pore size of the size of road P and drainpipe 21 and the water outlet hole being arranged in water storage cylinder 1 is according to the small pump of selection
Model customization, these are not so difficult for those skilled in the art, be not repeated here herein.
Signal amplifying system includes the (the conversion layer 9 use plasticity material of conversion layer 9 for being covered on detection pipeline P detection position
Material is made), and it is coated on the separation layer 8 outside conversion layer 9, it is also provided with environmental chamber 7 in the outside of the separation layer 8,
The conversion layer 9 subaerial side in setting is provided with conversion zone 11, and the inside of the conversion zone 11 is using watertight
Plastic material is made, and the outside of the conversion zone 11 is made of the fibrous material that can be seeped water, and the outside of the conversion zone 11 with
The bottom end of above-mentioned separation layer 8 sets at least 1 centimetre of distance.
Optical fiber Raman temperature sensor includes: Laser emission end 15, the bidirectional coupler 16 being connected with Laser emission end 15,
The bidirectional coupler 16 is connected with calibration 12 one end of optical fiber, the other end connecting detection optical fiber 13 of the calibration optical fiber 12, the detection
The end of optical fiber 13 is provided with Faraday rotation lens device 14, meanwhile, above-mentioned bidirectional coupler 16 and 17 phase of light wavelength division multiplexing
Even, which is connected with signal processor 18, which is connected with display 19.
The inside for being close to above-mentioned conversion zone 11 is arranged in the detection fiber 13, and detection fiber 13 is both transmission fiber
It is sensor fibre.
It is provided with flow rate regulating valve 3 in the first above-mentioned connecting tube 5, is respectively set at the both ends of above-mentioned detection pipeline P
First connecting flange 6 and the second connecting flange 20 are provided with adjustable stomata valve 10 on the detection pipeline P.
Its top cover of environmental chamber 7 is dismountable set by the outside of above-mentioned separation layer 8.
The inside for being close to above-mentioned conversion zone 11 is arranged in the detection fiber 14, is calcium carbonate quality in the conversion zone 11
Accounting is the stone of 90 percent (or other quality accountings appropriate are chosen under the premise of not influencing optical fiber and normally detecting)
The sodium bicarbonate tiling of market sale is placed in conversion zone 11 by lime stone.
Swashed by driving power, electronic switch, main laser, secondary laser constitution, main laser and pair at Laser emission end 15
Light device is connected with the input terminal of the first wave multiplexer, and the output of the first wave multiplexer terminates on the input terminal of bidirectional coupler 16；It should
The output end of bidirectional coupler 16 connects light wavelength division multiplexing 17, and the light wavelength division multiplexing 17 is there are three output port, and first
Output port is the central wavelength output port of Raman scattering, and second output port is the optical fiber of main laser wavelength backwards to auspicious
Sharp scattered wave output port, third output port are the optical fiber back rayleigh scattering wave output terminal mouth of secondary optical maser wavelength, optical fiber
First output port of wavelength division multiplexer 17 is connected with an input terminal of direct detection system, optical fibre wavelength division multiplexer 17
Second output port and third output port be connected respectively with two input terminals of the second wave multiplexer, the second wave multiplexer
Output end is connected with another input terminal of direct detection system, the output end and signal acquiring processing system of direct detection system
Input terminal be connected, after the signal processor 18 being made of direct detection system and signal acquiring processing system is handled by analysis
Each section of optical fiber of temperature value is provided to be shown by display.
Fiber laser arrays test positioning principle:
The optical fiber of the same band main laser is alternately exported backwards to anti-stoke when the driving power driving fiber switch time-division
The optical fiber Stokes Raman scattered wave (wavelength of this Raman scattering wave (wavelength 1550nm, pulsewidth 10ns) and secondary laser
1450nm, pulsewidth 10ns) bidirectional coupler 16 reached by the first wave multiplexer, when optical signal encounters farad in detection fiber propagation
After revolving mirror 14, optical signal is back to bidirectional coupler 16, sends optical signal to light wave point again by the bidirectional coupler 16
With device 17, for the light wavelength division multiplexing 17 there are three output port, first output port is that the central wavelength of Raman scattering exports
Port, second output port are the optical fiber back rayleigh scattering wave output terminal mouth of main laser wavelength, third output port
For the optical fiber back rayleigh scattering wave output terminal mouth of secondary optical maser wavelength, first output port of optical fibre wavelength division multiplexer 17 and straight
An input terminal for connecing detection system is connected, second output port and third output port of optical fibre wavelength division multiplexer 17
It is connected respectively with two input terminals of the second wave multiplexer, another input of the output end of the second wave multiplexer and direct detection system
End is connected, and the output end of direct detection system is connected with the input terminal of signal acquiring processing system, signal acquiring processing system point
Not Kou Chu one way main laser wavelength and secondary laser wavelength back rayleigh scattering optical time domain reflection influence, using same wave
The optical fiber of the laser of Duan Dancheng is scattered backwards to the optical fiber Stokes Raman of anti-Stokes Raman scattered wave and secondary laser
The intensity ratio of optical time domain reflection curve, obtains each section of optical fiber of temperature information, and shown by display.
The detection method of this experimental provision is as follows:
It powers first to Laser emission end 15, whether is in normal according to the curvilinear motion detection device that display 19 is shown
State (state normally then continues in next step, to be otherwise adjusted)；
Secondly it closes stomata valve 10 and starts water circulation system: adjusting flow velocity valve 3 and suitable water is poured into water storage cylinder 1, beat
Power device 4 is opened, so that water circulation system brings into operation in laboratory environments；
Stomata valve 10 is finally adjusted, so that the detection pipeline P among water circulation system slowly permeates, passes through institute's location
It sets and obtains the relationship of temperature Yu Raman scattering intensities ratio by theoretical calculation with the temperature comparisons of calibration optical fiber, pass through subsequent processing
Obtain the temperature data change curve at infiltration；
Above-mentioned experiment is repeated, stomata valve 10 is adjusted, so that different degrees of leak condition is presented in detection pipeline P, observation is real
The temperature change tested.Since water pipe infiltration needs certain time, and due to the thermometric process of optical fiber Raman temperature sensor
Several seconds to tens seconds each period was differed, so needing repeated measurement.
The accuracy of experiment is compared and analyzed by testing the leakage distance measured and actual range, to verify this dress
The effect to detection waterpipe leakage is set, for further designing pipe leakage alarm system and improving fiber Raman temperature sensing
Utensil is significant.
Since optical fiber is cheap, long service life, so the leak detection of research of the invention for city waterpipe
With on-line monitoring not only have research significance have more very high economic value, for apply the present invention to water pipe junction,
Signal amplifying system of the invention is arranged etc. repeatedly and all belongs to the scope of protection of the present invention by easy leak of water pipe etc..
Claims (5)
1. a kind of running water pipe leakage detection experiment platform based on optical fiber Raman temperature sensor, it is for solving pipe leakage
Detection and on-line monitoring problem, including water circulation system, signal amplifying system and optical fiber Raman temperature sensor, feature exist
In:
Water circulation system includes water storage cylinder (1), power device (4) and detects pipeline (P), the water storage cylinder (1) and power device (4)
It is connected by the first connecting tube (2), which is connect with detection pipeline (P) by the second connecting tube (5), the detection
Pipeline (P) is connect with water storage cylinder (1) by drainpipe (21)；
Signal amplifying system includes the conversion layer (9) for being covered on detection pipeline (P) detection position, and is coated on conversion layer (9)
External separation layer (8), is additionally provided with environmental chamber (7) in the outside of the separation layer (8), the conversion layer (9) is near the ground
Side be conversion zone (11), the inside of the conversion zone (11) is water-tight, and outside can seep water；The separation layer (8) is for preventing
Only environmental liquids penetrate into；It is the lime stone that calcium carbonate quality accounting is 90 percent in the conversion zone (11)；
Optical fiber Raman temperature sensor includes: Laser emission end (15), the bidirectional coupler being connected with Laser emission end (15)
(16), which is connected with calibration optical fiber (12) one end, the other end connecting detection light of the calibration optical fiber (12)
Fine (13), the end of the detection fiber (13) are provided with Faraday rotation lens device (14), meanwhile, bidirectional coupler (16) and light
Wavelength division multiplexer (17) is connected, which is connected with signal processor (18), the signal processor (18)
It is connected with display (19)；Detection fiber (13) is close to the inside of conversion zone (11), and it is anti-to meet water for lime stone when water pipe leaks
Temperature change should occur, since temperature change meeting modulation optical fiber is in the intensity of Raman scattering, liquid leakage signal is converted to bright
Aobvious temperature change signal realizes pipe leakage detection.
2. the running water pipe leakage detection experiment platform according to claim 1 based on optical fiber Raman temperature sensor,
It is characterized in that: being provided with flow rate regulating valve (3) on first connecting tube (2), the both ends of detection pipeline (P) are respectively set
There are the first connecting flange (6) and the second connecting flange (20), is provided with adjustable stomata valve on the detection pipeline (P)
(10).
3. the running water pipe leakage detection experiment platform according to claim 1 based on optical fiber Raman temperature sensor,
Be characterized in that: the outside of the conversion zone (11) is set at a distance from least 1 centimetre with the bottom end of the separation layer (8).
4. the running water pipe leakage detection experiment platform according to claim 1 based on optical fiber Raman temperature sensor,
Be characterized in that: environmental chamber (7) top cover being arranged outside the separation layer (8) is detachable.
5. the running water pipe leakage detection experiment platform according to claim 1 based on optical fiber Raman temperature sensor,
Be characterized in that: the detection fiber (13) is both transmission fiber and sensor fibre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710379580.3A CN107167263B (en) | 2017-05-25 | 2017-05-25 | Running water pipe leakage detection experiment platform based on optical fiber Raman temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710379580.3A CN107167263B (en) | 2017-05-25 | 2017-05-25 | Running water pipe leakage detection experiment platform based on optical fiber Raman temperature sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107167263A CN107167263A (en) | 2017-09-15 |
| CN107167263B true CN107167263B (en) | 2019-05-21 |
Family
ID=59820572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710379580.3A Active CN107167263B (en) | 2017-05-25 | 2017-05-25 | Running water pipe leakage detection experiment platform based on optical fiber Raman temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107167263B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131569A (en) * | 2018-01-10 | 2018-06-08 | 浙江工业大学 | A kind of sea-bottom natural gas line leakage experiment porch and its data processing method |
| CN110529744A (en) * | 2019-07-30 | 2019-12-03 | 江阴爱科森博顿聚合体有限公司 | A kind of dedicated optical cable nylon sheath wire material of pipe leakage detection |
| CN112524496A (en) * | 2020-11-23 | 2021-03-19 | 中国计量大学 | Experimental device for improve system alarm precision is revealed to optic fibre temperature detection water pipe |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW434380B (en) * | 2000-08-15 | 2001-05-16 | Chung Shan Inst Of Science | Sagnac interference optical fiber distribution type online leakage detection method and device |
| CN201003690Y (en) * | 2006-09-08 | 2008-01-09 | 北京工业大学 | Pipe leakage monitoring device based on Sagnac optical fiber interferometer |
| CN203757380U (en) * | 2013-12-20 | 2014-08-06 | 上海波汇通信科技有限公司 | Pipeline leakage detection system based on optical fiber technology |
| CN105135215A (en) * | 2015-06-26 | 2015-12-09 | 中国石油化工股份有限公司胜利油田分公司 | Leakage detection device for oil collecting pipeline with optical fiber method |
| CN206093530U (en) * | 2016-08-18 | 2017-04-12 | 杭州永慧科技有限公司 | Armor optic fibre inlays formula of burying pipeline leakage detection structure |
| CN106641739A (en) * | 2016-12-30 | 2017-05-10 | 天津市誉航润铭科技发展有限公司 | Water delivery pipe leakage locating system |
-
2017
- 2017-05-25 CN CN201710379580.3A patent/CN107167263B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107167263A (en) | 2017-09-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107167263B (en) | Running water pipe leakage detection experiment platform based on optical fiber Raman temperature sensor | |
| Xu et al. | Pipeline leak detection using Raman distributed fiber sensor with dynamic threshold identification method | |
| CN102519916B (en) | Method and device for on-line detecting concentration of pesticide | |
| CN105424651B (en) | A kind of orientable methane oxidizing archaea monitoring system | |
| CN105424163B (en) | INDIRECT COUPLING cone optical-fiber grating sonac | |
| CN104266999A (en) | Measurement instrument for refractive index of liquid based on D type plastic optical fiber probe | |
| CN103630509A (en) | On-line pesticide concentration detection device and method | |
| CN103940456A (en) | Interference reflective probe type optical microsensor and manufacturing method thereof | |
| CN104535091A (en) | Optical fiber sensing unit and application thereof for simultaneously measuring refractive index and temperature | |
| CN207232005U (en) | Multiplexing fiber-optic gas sensing system based on weak optical fiber Bragg grating and optical time domain reflectometer | |
| CN205091262U (en) | Glycerine concentration detection system that combines smart mobile phone and single mode - thin core - single mode fiber | |
| Yu et al. | Acoustic microfiber sensor for gas pipeline leakage detection | |
| US5249864A (en) | System for characterizing temperature of fluids | |
| US5272333A (en) | System for characterizing pressure, movement, and temperature of fluids | |
| CN103822902B (en) | Real-time online liquid physical parameter measuring device with window glass used as sensing window | |
| CN107907491A (en) | A kind of fibre optical sensor and its detection platform and method | |
| CN112284270A (en) | Metal surface corrosion monitoring device based on fiber bragg grating self-temperature compensation | |
| US5324956A (en) | System for characterizing movement and temperature of fluids | |
| CN206818249U (en) | The monitoring system of subsoil drain | |
| CN109798448A (en) | Concrete duct leakage experiment device and method based on anti-Stokes light filtering | |
| CN109518735A (en) | One kind being based on pile foundation static load test test macro | |
| CN104267000A (en) | Plastic optical fiber refractive index sensor on basis of micropore structure and preparation method and application thereof | |
| CN205580988U (en) | Device of passive laser detection of internal floating roof tank oil gas class mist | |
| CN113588573A (en) | Real-time dynamic monitoring device and monitoring method for soil sampling sand content of underwater open caisson | |
| CN107478577A (en) | Multiplexing fiber-optic gas sensing system based on weak optical fiber Bragg grating and optical time domain reflectometer |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20170915 Assignee: Xinchang China Metrology University Enterprise Innovation Research Institute Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2021330000071 Denomination of invention: Experimental platform for water pipe leakage detection based on optical fiber Raman temperature sensor Granted publication date: 20190521 License type: Common License Record date: 20210816 |
|
| EC01 | Cancellation of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Xinchang China Metrology University Enterprise Innovation Research Institute Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2021330000071 Date of cancellation: 20211231 |