CN110887774B - Sponge city permeable pavement water level monitoring system based on fiber bragg grating - Google Patents
Sponge city permeable pavement water level monitoring system based on fiber bragg grating Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 95
- 239000000835 fiber Substances 0.000 title claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 52
- 239000013307 optical fiber Substances 0.000 claims abstract description 45
- 230000005484 gravity Effects 0.000 claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000002788 crimping Methods 0.000 claims description 10
- 239000000523 sample Substances 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000035699 permeability Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002352 surface water Substances 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 3
- 230000036632 reaction speed Effects 0.000 abstract 1
- 238000001723 curing Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 239000011449 brick Substances 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/0846—Investigating permeability, pore-volume, or surface area of porous materials by use of radiation, e.g. transmitted or reflected light
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- Chemical & Material Sciences (AREA)
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- Dispersion Chemistry (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Structural Engineering (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Health & Medical Sciences (AREA)
- Architecture (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
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Abstract
A sponge city permeable pavement water level monitoring system based on fiber bragg gratings comprises at least one monitoring unit, wherein the monitoring unit is embedded below a permeable pavement and is connected with a signal processing device through an optical cable; the single monitoring unit comprises at least two fiber grating temperature sensors, all the fiber grating temperature sensors are sequentially arranged along the gravity direction, and the adjacent fiber grating temperature sensors are connected in series; the single fiber grating temperature sensor comprises an aluminum shell and optical fibers, a grating area is arranged on the optical fibers in the aluminum shell, the portions on the two sides of the grating area on the optical fibers are connected with the inner wall of the aluminum shell in a curing mode, and the portions extending out of the aluminum shell on the optical fibers are connected with the optical fibers on the adjacent fiber grating temperature sensors in series. The design can not only monitor the road surface water permeability for a long time, and has better monitoring effect, but also has faster monitoring reaction speed and higher accuracy.
Description
Technical Field
The invention relates to a permeable pavement water level monitoring system, belongs to the field of sponge city health monitoring, and particularly relates to a sponge city permeable pavement water level monitoring system based on fiber bragg gratings.
Background
With the rapid development of city construction in China, the construction concept of sponge cities gradually goes into the field of vision of the public. The main content of the current construction of the sponge city is the construction of a Low Impact Development (LID) rainwater system, and the permeable pavement is increasingly applied to urban roads due to the good performance and the outstanding advantages of the permeable pavement and becomes an important component in the construction of the sponge city. The permeable pavement in the urban road is usually made of permeable bricks, the permeable bricks have good air permeability, water permeability and water retention, rainwater can permeate through the communicated pores inside the permeable bricks, urban surface runoff can be effectively relieved, underground water resource balance is adjusted, urban heat island effect is reduced, and urban noise is reduced.
But its water permeability can weaken along with time, and this kind of weakening all has adverse effect to functions such as the retaining of sponge city, infiltration, drainage, therefore the monitoring of city road surface water permeability has important meaning. The traditional temperature sensor is difficult to use for a long time in the environment with humidity and complex stress.
The information disclosed in this background section is only for enhancement of understanding of the general background of the patent application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.
Disclosure of Invention
The invention aims to overcome the defect and the problem that the road surface water permeability is difficult to monitor for a long time in the prior art, and provides a sponge city permeable road surface water level monitoring system based on fiber bragg gratings, which can monitor the road surface water permeability for a long time.
In order to achieve the above purpose, the technical solution of the invention is as follows: a sponge city permeable pavement water level monitoring system based on fiber bragg gratings comprises at least one monitoring unit, wherein the monitoring unit is buried under a permeable pavement and is connected with a signal processing device through an optical cable;
the single monitoring unit comprises at least two fiber grating temperature sensors, all the fiber grating temperature sensors are sequentially arranged along the gravity direction, and the adjacent fiber grating temperature sensors are connected in series;
the single fiber grating temperature sensor comprises an aluminum shell and optical fibers, a grating area is arranged on the portion, located in the aluminum shell, of each optical fiber, a grating is arranged in each grating area, portions, located on two sides of each grating area, of each optical fiber are connected with the inner wall of the aluminum shell in a curing mode, and the portions, extending out of the aluminum shell, of each optical fiber are connected with the optical fibers on the adjacent fiber grating temperature sensors in series.
In a single monitoring unit, the central wavelengths used by all the fiber bragg grating temperature sensors are sequentially increased from top to bottom along the gravity direction, and the minimum difference value is larger than 3mm.
The grating region is in a relaxed state.
The signal processing device comprises a fiber grating demodulator and a data processor, and the monitoring unit is connected with the data processor through an optical cable and the fiber grating demodulator in sequence.
The number of the monitoring units is at least two, the adjacent monitoring units are connected in parallel, and the number of the fiber grating temperature sensors in a single monitoring unit is four to ten.
The monitoring through hole is arranged in the aluminum shell, the grating area is arranged in the middle of the monitoring through hole, the parts, located on two sides of the grating area, of the optical fiber are connected with the hole wall of the monitoring through hole in a curing mode, the sealing parts are arranged at two ends of the monitoring through hole, and the optical fiber penetrates through the sealing parts and then extends out of the aluminum shell.
The sealing part comprises a threaded hole and a crimping head, threads are arranged on the inner walls of the two ends of the monitoring through hole to obtain the threaded hole, the end part of the crimping head is in threaded connection with the threaded hole, and the optical fiber sequentially penetrates through the threaded hole and the crimping head and then extends out of the aluminum shell.
The arrangement direction of the monitoring through holes is along the gravity direction, and the arrangement direction of the parts, which are positioned in the monitoring through holes, on the optical fibers is along the gravity direction.
And a heating through hole is arranged on the aluminum shell beside the monitoring through hole, a heating sheet is packaged in the heating through hole, and two ends of the heating through hole are sealed.
The aluminum shell is also provided with a blind hole, the blind hole and the monitoring through hole are both positioned on the same side of the heating through hole, and a temperature sensing probe is arranged in the blind hole.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a sponge city permeable pavement water level monitoring system based on fiber bragg gratings, which mainly comprises a monitoring unit embedded below a permeable pavement, wherein the monitoring unit is connected with a signal processing device through an optical cable, a single monitoring unit comprises at least two fiber bragg grating temperature sensors, the single fiber bragg grating temperature sensor comprises an aluminum shell and an optical fiber packaged in the aluminum shell, and a grating area is arranged on the part, positioned in the aluminum shell, of the optical fiber. Therefore, the invention not only can monitor the road surface water permeability for a long time, but also has better monitoring effect.
2. In the sponge city permeable pavement water level monitoring system based on the fiber bragg gratings, all the fiber bragg grating temperature sensors are sequentially arranged in a single monitoring unit along the gravity direction, and the adjacent fiber bragg grating temperature sensors are connected in series. Therefore, the reaction monitoring speed is high, and the accuracy is high.
3. In the sponge city permeable pavement water level monitoring system based on the fiber bragg grating, the adopted fiber bragg grating temperature sensor comprises an aluminum shell and optical fibers, a grating area is arranged on the portion, located in the aluminum shell, of each optical fiber, gratings are arranged in the grating area, the portions, located on two sides of the grating area, of each optical fiber are in curing connection with the inner wall of the aluminum shell, and the portions, extending out of the aluminum shell, of each optical fiber are connected with optical fibers on the adjacent fiber bragg grating temperature sensors in series. Therefore, the invention has long service life and good monitoring effect.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural diagram of the fiber grating temperature sensor in the invention.
Fig. 3 is a schematic diagram of the relative positions of the optical fiber and the aluminum housing in fig. 2.
Fig. 4 is a schematic view of the aluminum housing of fig. 2.
In the figure: the permeable pavement 1, the monitoring unit 2, the signal processing device 3, the fiber grating demodulator 31, the data processor 32, the optical cable 33, the fiber grating temperature sensor 4, the aluminum shell 41, the optical fiber 42, the grating area 421, the grating 422, the monitoring through hole 43, the sealing part 44, the threaded hole 441, the crimping head 442, the heating through hole 45, the heating sheet 451, the blind hole 46 and the temperature sensing probe 461.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description of the invention.
Referring to fig. 1 to 4, the sponge city permeable pavement water level monitoring system based on the fiber bragg grating comprises at least one monitoring unit 2, wherein the monitoring unit 2 is embedded below the permeable pavement 1, and the monitoring unit 2 is connected with a signal processing device 3 through an optical cable 33;
the single monitoring unit 2 comprises at least two fiber bragg grating temperature sensors 4, all the fiber bragg grating temperature sensors 4 are sequentially arranged along the gravity direction, and the adjacent fiber bragg grating temperature sensors 4 are connected in series;
the single fiber grating temperature sensor 4 comprises an aluminum housing 41 and an optical fiber 42, a grating area 421 is arranged on the optical fiber 42 at a position inside the aluminum housing 41, a grating 422 is arranged inside the grating area 421, the positions on the optical fiber 42 at two sides of the grating area 421 are in curing connection with the inner wall of the aluminum housing 41, and the position on the optical fiber 42 extending out of the aluminum housing 41 is in series connection with the optical fiber 42 on the adjacent fiber grating temperature sensor 4.
In a single monitoring unit 2, the central wavelengths used by all the fiber grating temperature sensors 4 are sequentially increased from top to bottom along the gravity direction, and the minimum difference is greater than 3mm.
The grating region 421 is in a relaxed state.
The signal processing device 3 comprises a fiber grating demodulator 31 and a data processor 32, and the monitoring unit 2 is connected with the data processor 32 through an optical cable 33 and the fiber grating demodulator 31 in sequence.
The number of the monitoring units 2 is at least two, the adjacent monitoring units 2 are connected in parallel, and the number of the fiber bragg grating temperature sensors 4 in a single monitoring unit 2 is four to ten.
Be provided with monitoring through hole 43 in the aluminium shell 41, the middle part of this monitoring through hole 43 is provided with grating district 421, and the position that lies in grating district 421 both sides on the optic fibre 42 carries out solidification with the pore wall of monitoring through hole 43 and is connected, and the both ends of monitoring through hole 43 are provided with closing part 44, and optic fibre 42 extends outside aluminium shell 41 after wearing closing part 44.
The closing portion 44 includes a screw hole 441 and a crimping head 442, the inner walls of the two ends of the monitoring through hole 43 are provided with threads to obtain the screw hole 441, the end portion of the crimping head 442 is connected with the screw hole 441 in a threaded manner, and the optical fiber 42 extends to the outside of the aluminum housing 41 after passing through the screw hole 441 and the crimping head 442 in sequence.
The arrangement direction of the monitoring through hole 43 is along the gravity direction, and the arrangement direction of the part of the optical fiber 42 located in the monitoring through hole 43 is along the gravity direction.
A heating through hole 45 is formed in the aluminum case 41 at a portion beside the monitoring through hole 43, a heating sheet 451 is sealed inside the heating through hole 45, and both ends of the heating through hole 45 are sealed.
The aluminum housing 41 is further provided with a blind hole 46, the blind hole 46 and the monitoring through hole 43 are both located on the same side of the heating through hole 45, and a temperature sensing probe 461 is arranged in the blind hole 46.
The principle of the invention is illustrated as follows:
the signal processing device 3 of the invention comprises a fiber grating demodulator 31 and a data processor 32, wherein the fiber grating demodulator 31 is connected with the monitoring unit 2 through an optical cable 33, the monitoring unit 2 is formed by connecting a plurality of fiber grating temperature sensors 4 in series in sequence, therefore, each fiber grating temperature sensor 4 is connected with the optical cable 33 through an optical fiber 42 included in the fiber grating temperature sensor so as to be connected with the fiber grating demodulator 31, and further the fiber grating demodulator 31 can receive, demodulate and store optical signals reflected by the fiber grating temperature sensors 4 and convert the optical signals into wavelength signals, when rainwater permeates to different depths of a permeable road surface, the wavelengths of light reflected by the fiber grating temperature sensors 4 at different positions can be changed, after the signals are collected by the fiber grating demodulator 31, the signals are transmitted to the data processor 32, and then the wavelength signals transmitted by the demodulator are read and stored by demodulation software in the data processor 32 and converted into temperature values, so that the temperature values of various measuring points can be visually displayed.
The fiber grating temperature sensor 4 adopted by the design comprises an aluminum shell 41 and an optical fiber 42, a grating area 421 is arranged on the part, located in the aluminum shell 41, of the optical fiber 42, a grating 422 is arranged in the grating area 421, the parts, located on two sides of the grating area 421, of the optical fiber 42 are in curing connection with the inner wall of the aluminum shell 41 through epoxy resin, the distance between the parts and the two ends of the grating area 421 is preferably 3mm, the curing method is preferably heating and curing, the grating area 421 is in a loose state and is free of any pressure and tension. The optical fiber 42 of a single fiber grating temperature sensor 4 extending out of the aluminum housing 41 is connected to the optical fiber 42 of the adjacent fiber grating temperature sensor 4 extending out of the aluminum housing 41 through a flange.
A through monitoring through hole 43 is formed in the aluminum housing 41, the grating region 421 is located at the center of the monitoring through hole 43, and two ends of the monitoring through hole 43 are sealed by sealing parts 44. When the fiber grating temperature sensor 4 is buried, the monitoring through hole 43 is placed upwards, namely, vertically along the gravity direction, and when the fiber grating temperature sensor is placed in this way, if the rainwater permeates, the sensor can react more quickly. Need guarantee when burying that the used center wavelength of sensor is different on the same vertical direction, better be center wavelength from the top down increase in proper order, minimum difference should be greater than 3mm, and the region that the water permeability is good and the relatively poor region of water permeability can form obvious contrast when arranging according to this mode.
The invention also provides a heating through hole 45 on the aluminum shell 41 at the side of the monitoring through hole 43, a heating sheet 451, preferably a PTC heating sheet, is packaged in the heating through hole 45, and the purpose of the design is to achieve a more sensitive temperature measurement effect, and in the absence of precipitation, the heating sheet 451 is controlled to heat the aluminum shell 41 to a constant temperature. The heating sheet 451 is disposed at the center of the heating through hole 45, and is sealed with silicone rubber to prevent water leakage and electric leakage. The aluminum housing 41 is further provided with a blind hole 46, the blind hole 46 is provided with a temperature sensing probe 461, preferably PT100, and in order to improve the measurement accuracy, the aluminum housing also needs to be sealed by silicon rubber.
The data processor 32 in the present invention processes the wavelength signal sent from the fiber grating demodulator 31 to display the temperature value of the position of each sensor in real time, according to the processing formula:
ΔT＝(λt-λ)/k，
wherein, λ is the initial wavelength, K is the temperature sensitivity coefficient, Δ T is the measured temperature value, and λ T is the real-time measured wavelength value.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (6)
1. The utility model provides a sponge city permeable pavement water level monitoring system based on fiber grating which characterized in that: the monitoring system comprises at least one monitoring unit (2), wherein the monitoring unit (2) is buried under the permeable pavement (1), and the monitoring unit (2) is connected with the signal processing device (3) through an optical cable (33);
the single monitoring unit (2) comprises at least two fiber grating temperature sensors (4), all the fiber grating temperature sensors (4) are sequentially arranged along the gravity direction, and the adjacent fiber grating temperature sensors (4) are connected in series;
the single fiber grating temperature sensor (4) comprises an aluminum shell (41) and optical fibers (42), a grating area (421) is arranged on the part, located in the aluminum shell (41), of the optical fibers (42), a grating (422) is arranged in the grating area (421), the parts, located on two sides of the grating area (421), of the optical fibers (42) are in curing connection with the inner wall of the aluminum shell (41), and the parts, extending out of the aluminum shell (41), of the optical fibers (42) are connected with the optical fibers (42) on the adjacent fiber grating temperature sensors (4) in series;
in a single monitoring unit (2), the central wavelengths used by all the fiber bragg grating temperature sensors (4) are sequentially increased from top to bottom along the gravity direction, and the minimum difference value is larger than 3nm;
a monitoring through hole (43) is arranged in the aluminum shell (41), a grating area (421) is arranged in the middle of the monitoring through hole (43), parts of the optical fiber (42) positioned at two sides of the grating area (421) are connected with the hole wall of the monitoring through hole (43) in a curing manner, closed parts (44) are arranged at two ends of the monitoring through hole (43), and the optical fiber (42) extends out of the aluminum shell (41) after penetrating through the closed parts (44);
a heating through hole (45) is formed in the aluminum shell (41) and is positioned beside the monitoring through hole (43), a heating sheet (451) is packaged in the heating through hole (45), and two ends of the heating through hole (45) are sealed; the aluminum shell (41) is also provided with a blind hole (46), the blind hole (46) and the monitoring through hole (43) are both positioned at the same side of the heating through hole (45), and a temperature sensing probe (461) is arranged in the blind hole (46);
the sponge city permeable pavement water level monitoring system based on the fiber bragg grating is applied in the following mode: under the condition of no precipitation, controlling a heating sheet (451) to heat the aluminum shell (41) to a constant temperature; when precipitation occurs, the demodulation software in the data processor (32) reads and stores the wavelength signals sent by the fiber grating demodulator (31) and converts the wavelength signals into temperature values, and then the temperature values of all measuring points can be visually displayed.
2. The sponge city permeable pavement water level monitoring system based on fiber bragg grating of claim 1, which is characterized in that: the grating region (421) is in a relaxed state.
3. The fiber grating-based sponge city permeable pavement water level monitoring system according to claim 1, characterized in that: the signal processing device (3) comprises a fiber grating demodulator (31) and a data processor (32), and the monitoring unit (2) is connected with the data processor (32) after sequentially passing through the optical cable (33) and the fiber grating demodulator (31).
4. The sponge city permeable pavement water level monitoring system based on fiber bragg grating of claim 1, which is characterized in that: the number of the monitoring units (2) is at least two, the adjacent monitoring units (2) are connected in parallel, and the number of the fiber bragg grating temperature sensors (4) in a single monitoring unit (2) is four to ten.
5. The sponge city permeable pavement water level monitoring system based on fiber bragg grating of claim 1, which is characterized in that: the closing part (44) comprises a threaded hole (441) and a crimping head (442), threads are arranged on the inner walls of two ends of the monitoring through hole (43) to obtain the threaded hole (441), the end part of the crimping head (442) is in threaded connection with the threaded hole (441), and the optical fiber (42) sequentially penetrates through the threaded hole (441) and the crimping head (442) and then extends out of the aluminum shell (41).
6. The sponge city permeable pavement water level monitoring system based on fiber bragg grating of claim 1, which is characterized in that: the arrangement direction of the monitoring through hole (43) is along the gravity direction, and the arrangement direction of the part, located in the monitoring through hole (43), on the optical fiber (42) is along the gravity direction.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111795994A (en) * | 2020-04-30 | 2020-10-20 | 中山市精量光电子科技有限公司 | Plug-in fiber bragg grating water seepage monitoring sensor |
| CN111897375B (en) * | 2020-07-31 | 2021-07-06 | 长江三峡通航管理局 | Ship lock operation dynamic water level monitoring system and monitoring method |
| CN113566880A (en) * | 2021-06-30 | 2021-10-29 | 武汉理工大学 | Urban ponding early warning system and method |
| CN113739868B (en) * | 2021-09-10 | 2023-07-28 | 武汉理工大学 | Real-time early warning and monitoring system and method for ponding of natural sponge facility |
| CN114705250A (en) * | 2022-04-14 | 2022-07-05 | 大连理工大学 | Reservoir water level and water temperature distributed monitoring device and method |
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| CN202075063U (en) * | 2011-01-04 | 2011-12-14 | 国网电力科学研究院 | Fiber bragg grating temperature sensor for cable temperature measurement |
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| CN103398800A (en) * | 2013-07-20 | 2013-11-20 | 北京航空航天大学 | Quasi-distributed fiber bragg grating temperature stress measuring system for large-size structure body |
| CN203879550U (en) * | 2013-12-13 | 2014-10-15 | 石家庄经济学院 | Monitoring device for coal mine tunnel based on fiber gratings |
| CN107121217A (en) * | 2017-04-27 | 2017-09-01 | 北京石油化工学院 | Soil moisture detection means, system and heating system in earth source heat pump |
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