CN216283442U - Soil settlement monitoring and evaluation device based on FBG temperature sensor - Google Patents
Soil settlement monitoring and evaluation device based on FBG temperature sensor Download PDFInfo
- Publication number
- CN216283442U CN216283442U CN202123042321.2U CN202123042321U CN216283442U CN 216283442 U CN216283442 U CN 216283442U CN 202123042321 U CN202123042321 U CN 202123042321U CN 216283442 U CN216283442 U CN 216283442U
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- soil
- temperature sensor
- fbg temperature
- settlement
- 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.)
- Expired - Fee Related
Links
- 239000002689 soil Substances 0.000 title claims abstract description 106
- 238000012544 monitoring process Methods 0.000 title claims abstract description 44
- 238000011156 evaluation Methods 0.000 title claims description 9
- 239000013307 optical fiber Substances 0.000 claims abstract description 90
- 238000009413 insulation Methods 0.000 claims abstract description 30
- 230000008859 change Effects 0.000 claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 230000000903 blocking effect Effects 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 238000005067 remediation Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 230000013011 mating Effects 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 206010070834 Sensitisation Diseases 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000008313 sensitization Effects 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical group COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process 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
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model provides a soil settlement monitoring and evaluating device based on FBG temperature sensors, which belongs to the technical field of land remediation and comprises a chassis, an optical fiber sensor, a thermal insulation disc and a monitoring mechanism. The chassis is buried in the soil to be detected; the optical fiber sensors are connected to the chassis and generate corresponding wavelength change signals through temperature change caused by soil layer settlement; the plurality of heat insulation discs are arranged on the plurality of optical fiber sensors in a one-to-one correspondence manner and are used for blocking the influence of the external environment on the soil temperature; the monitoring mechanism comprises an optical fiber modulation and demodulation instrument and a display module which are electrically connected with each other, the optical fiber modulation and demodulation instrument is electrically connected with the optical fiber sensors, and the optical fiber modulation and demodulation instrument is used for receiving wavelength change signals of the optical fiber sensors, generating corresponding soil settlement values and displaying the corresponding soil settlement values by means of the display module. The soil settlement monitoring and evaluating device based on the FBG temperature sensor can timely and accurately monitor the soil settlement.
Description
Technical Field
The utility model belongs to the technical field of land remediation, and particularly relates to a soil settlement monitoring and evaluating device based on an FBG temperature sensor.
Background
At present, in the field of land reclamation engineering, an artificial soil monitoring device mainly comprises a monitoring pile and scales on the monitoring pile, the soil monitoring device is greatly influenced by uneven settlement of an artificial soil body, the monitored soil body settlement is a punctiform soil body, the settlement value is greatly influenced by artificial randomness, and the subjective factors are more, so that the monitored soil body settlement value has the characteristics of inaccuracy, poor precision, poor representativeness and the like, has larger deviation from the true value, and can not timely and accurately obtain effective settlement monitoring on the settlement of soil.
Therefore, in view of the above shortcomings, it is desirable to provide a soil settlement monitoring and evaluating device based on FBG temperature sensors.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a soil settlement monitoring and evaluating device based on an FBG temperature sensor, which can timely and accurately detect soil settlement.
In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a soil settlement monitoring and evaluation device based on FBG temperature sensor includes:
the chassis is buried in the soil to be detected;
the optical fiber sensors are connected to the chassis and extend upwards to the upper part of the soil layer, and generate corresponding wavelength change signals through temperature change caused by soil layer settlement;
the plurality of heat insulation discs are arranged on the plurality of optical fiber sensors in a one-to-one correspondence manner, the heat insulation discs are attached to the upper surface of the soil layer and can move up and down along the optical fiber sensors, and the heat insulation discs are used for blocking the influence of the external environment on the soil temperature;
the monitoring mechanism comprises optical fiber modulation and demodulation instruments and a display module which are electrically connected with each other, the optical fiber modulation and demodulation instruments are electrically connected with the optical fiber sensors, and the optical fiber modulation and demodulation instruments are used for receiving wavelength change signals of the optical fiber sensors, generating corresponding soil settlement values and displaying the corresponding soil settlement values by means of the display module.
In one possible implementation, the monitoring mechanism further includes:
and the early warning module is electrically connected with the optical fiber modem so as to alarm when the soil settlement value exceeds a threshold value.
In one possible implementation manner, the soil settlement monitoring and evaluating device based on the FBG temperature sensor further includes:
the workbench is arranged on one side of the soil to be detected and used for installing the optical fiber modem, the display module and the early warning module.
In a possible implementation manner, a matching hole is formed in the middle of the thermal insulation disc, and the optical fiber sensor penetrates through the corresponding matching hole, so that the thermal insulation disc moves up and down along the optical fiber sensor.
In one possible implementation, a protective cover is arranged on the top of the optical fiber sensors.
In one possible implementation, the protective cover is a plexiglass material.
In one possible implementation, the chassis is a viscoelastic corrosion resistant material.
In one possible implementation, the optical fiber sensor is an FBG temperature sensor.
In one possible implementation, the FBG temperature sensor comprises:
the heat conduction paste is filled in the outer protection steel pipe, a semi-cylindrical bent body is arranged in the outer protection steel pipe, a bending part of the semi-cylindrical bent body is provided with an installation groove along the axial direction of the outer protection steel pipe, and fiber gratings are installed in the installation groove;
and the transmission optical fiber penetrates through the outer protective steel pipe and is electrically connected with the fiber bragg grating.
In one possible implementation manner, the optical fiber modem is a tunable F-P cavity filter demodulation system.
The soil settlement monitoring and evaluating device based on the FBG temperature sensor has the beneficial effects that: compared with the prior art, the chassis is buried in the soil to be detected and is in a stable state, the chassis is connected with a plurality of optical fiber sensors which extend upwards to the upper part of the soil to be detected, the plurality of heat insulation discs are correspondingly arranged on the plurality of optical fiber sensors, and the lifting disc is attached to the upper surface of the soil layer and can move up and down along the optical fiber sensors along with the settlement of the soil layer. When soil subsides, the optical fiber sensor part that originally is arranged in soil has exposed the soil surface, and optical fiber sensor has changed because soil subsides the temperature that exposes the part, and at this moment, optical fiber sensor can produce corresponding wavelength variation signal according to ambient temperature's change, compares with the wavelength when not subsiding, and wavelength variation regional length is the soil settlement value promptly. An optical fiber modulation and demodulation instrument in the monitoring mechanism receives the wavelength change signal of the induction optical fiber sensor, correspondingly generates the settlement value of the soil, transmits the corresponding soil layer settlement value signal to the display module, and displays the corresponding value on the display module so as to achieve the monitoring and evaluation of the soil layer settlement change. The soil settlement monitoring and evaluating device based on the FBG temperature sensor can timely and accurately monitor the soil settlement.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a soil settlement monitoring and evaluating device based on an FBG temperature sensor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an FBG temperature sensor according to an embodiment of the present invention.
Description of reference numerals:
1. a chassis; 2. an optical fiber sensor; 201. an outer protecting steel pipe; 202. a semi-cylindrical curved body; 203. a fiber grating; 204. a transmission optical fiber; 3. a thermal insulation disc; 301. a mating hole; 4. an optical fiber modem; 5. a display module; 6. an early warning module; 7. a work table; 8. a protective cover.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1, a soil settlement monitoring and evaluating apparatus based on FBG temperature sensor according to the present invention will now be described. Soil settlement monitoring and evaluation device based on FBG temperature sensor includes chassis 1, optical fiber sensor 2, separates temperature dish 3 and monitoring mechanism.
The chassis 1 is buried in the soil to be detected; the optical fiber sensors 2 are connected to the chassis 1 and extend upwards to the upper part of the soil layer, and the optical fiber sensors 2 generate corresponding wavelength change signals through temperature change caused by soil layer settlement; the plurality of heat insulation discs 3 are correspondingly arranged on the plurality of optical fiber sensors 2 one by one, the heat insulation discs 3 are attached to the upper surface of the soil layer, the heat insulation discs 3 can move up and down along the optical fiber sensors 2, and the heat insulation discs 3 are used for blocking the influence of the external environment on the soil temperature; the monitoring mechanism comprises an optical fiber modem 4 and a display module 5 which are electrically connected with each other, the optical fiber modem 4 is electrically connected with the optical fiber sensors 2, and the optical fiber modem 4 is used for receiving wavelength change signals of the optical fiber sensors 2, generating corresponding soil settlement values and displaying the values by means of the display module 5.
Compared with the prior art, the soil settlement monitoring and evaluating device based on the FBG temperature sensors has the advantages that the chassis 1 is buried in the soil to be detected and is in a stable state, the chassis 1 is connected with the optical fiber sensors 2 which extend upwards to the upper part of the soil to be detected, the plurality of heat insulation discs 3 are correspondingly arranged on the plurality of optical fiber sensors 2, and the heat insulation discs 3 are attached to the upper surface of the soil layer and can move up and down along the optical fiber sensors 2 along with the settlement of the soil layer. When soil subsides, the optical fiber sensor 2 that originally is arranged in soil partially has exposed the soil surface, and optical fiber sensor 2 has changed because the temperature of soil subsides exposure part, and at this moment, optical fiber sensor 2 can produce corresponding wavelength variation signal according to ambient temperature's change, compares with the wavelength when not subsiding, and wavelength variation regional length is the soil settlement value promptly. An optical fiber modulation and demodulation instrument 4 in the monitoring mechanism receives the wavelength change signal of the induction optical fiber sensor 2, correspondingly generates the settlement value of the soil, transmits the corresponding soil layer settlement value signal to a display module 5, and displays the corresponding value on the display module 5 so as to monitor and evaluate the soil layer settlement change. The soil settlement monitoring and evaluating device based on the FBG temperature sensor can timely and accurately monitor the soil settlement.
In some embodiments, referring to fig. 1, the monitoring mechanism further includes an early warning module 6.
The early warning module 6 is electrically connected with the optical fiber modem 4 to alarm when the soil settlement value exceeds a threshold value.
The early warning module 6 can be one or a combination of sound and light alarm modules, and a threshold value is prefabricated in the optical fiber modem 4, wherein the threshold value is the upper limit and the lower limit of the allowable settlement of the soil. When the soil layer settlement value received by the optical fiber modem 4 is within the threshold range, the early warning module 6 is in a non-working state, namely, does not give an alarm; when the soil layer settlement value received by the optical fiber modem 4 exceeds or is lower than the threshold value, the early warning module 6 triggers to generate an optical signal or an acoustic signal or trigger an acoustic-optical signal so as to timely and accurately convey related information to an operator.
Optionally, referring to fig. 1, the soil settlement monitoring and evaluating device based on the FBG temperature sensor further includes a workbench 7.
And the workbench 7 is arranged on one side of the soil to be detected and is used for installing the optical fiber modem 4, the display module 5 and the early warning module 6.
Specifically, the workbench 7 is a platform for bearing the optical fiber modem 4, the display module 5 and the early warning module 6, and can provide mounting positions for the three, so that the integration, the operation and the monitoring are convenient.
Preferably, referring to fig. 1, a fitting hole 301 is formed in the middle of the thermal insulation plate 3, and the optical fiber sensor 2 penetrates through the corresponding fitting hole 301, so that the thermal insulation plate 3 moves up and down along the optical fiber sensor 2. The mating holes 301 are located in the middle of the thermal insulation disc 3, and the optical fiber sensor 2 penetrates through the corresponding mating holes 301, so that the thermal insulation disc 3 can move up and down along with the settlement of the soil layer along with the optical fiber sensor 2.
Referring to fig. 1, a protective cover 8 is disposed on top of the plurality of optical fiber sensors 2. The protective cover 8 covers the upper part of the thermal insulation disc 3, so that the thermal insulation disc 3 and the optical fiber sensor 2 can be effectively protected, and the influence of the external temperature is reduced.
Preferably, the protective cover 8 is made of organic glass material, and has certain strength and a better heat insulation effect.
Preferably, the chassis 1 is a viscoelastic anticorrosive material, such as polyolefin anticorrosive material, which has a unimolecular non-bonded structural feature. The characteristic ensures that the material is completely sealed and resists corrosion, and the performance not only ensures that the material has excellent sealing and bonding performance, but also ensures that the material has certain solid-state characteristic and has enough strength.
Referring to fig. 2, the optical fiber sensor 2 is an FBG temperature sensor, and since the fiber bragg grating is affected by strain and temperature change at the same time, the two factors should be considered at the same time and analyzed separately when calculating the reflection wavelength change.
According to the coupled mode theory, the reflection wavelength of the fiber bragg grating is as follows:
λB＝2neff·Λ
in the formula neffLambda is the grating period, which causes n to be induced when the physical quantity (temperature) of the object to be measured applied to the fiber grating 203 changeseffAnd a corresponding change in Λ, resulting in a fiber bragg grating central reflection wavelength λBChange of (i) that
The first term is the wavelength variation of the fiber grating 203 caused by the strain variation, and the second term is the wavelength variation of the fiber grating 203 caused by the temperature variation.
When making temperature measurements, the fiber bragg grating must be kept completely strain-free. FBG temperature sensors specially packaged for this purpose can be used, which ensure that the properties of the fiber bragg grating inside the package are not coupled to any external bending, stretching, squeezing or twisting strain. Therefore, the change in the reflected wavelength due to temperature change can be determined mainly by the temperature optical sensitivity coefficient of the optical fiber.
The prototype-packaged temperature sensor has eliminated the effect of strain, temperature variation causes both the refractive index variation of the fiber grating 203 and the pitch variation due to thermal expansion, and the fiber grating 203 has the following temperature response characteristics regardless of the waveguide effect:
where α and ζ are the thermal coefficient and the photosensitive coefficient of the fiber grating 203, respectively, and the temperature sensitivity coefficient K is made for simplicityTα + ζ, the formula is simplified as:
i.e. the change of the central wavelength of the fiber grating 203 assuming no strain effect, as a function of the temperature increase.
The temperature change is converted into the wavelength change through the fiber Bragg grating, and then the wavelength change is reflected on the displacement, and finally the soil settlement is obtained.
The packaging structure of the FBG temperature sensor is composed of an outer protection steel pipe 201 and a semi-cylindrical bent body 202, a transmission optical fiber 204 penetrates through the outer protection steel pipe 201, the semi-cylindrical bent body 202 is formed by processing a semi-cylindrical stainless steel body with the outer diameter equal to the inner diameter of the outer protection steel pipe 201, a semi-circular groove is formed in the bent part along the axis, an optical fiber grating 203 and two ends of the optical fiber grating are glued in the groove, the optical fiber is glued at the position close to the two ends, a slight bend is reserved between gluing points, and non-solidified heat conducting paste is filled in the pipe. The bent part of the semi-cylindrical bent body 202 is a sensitization body of the fiber grating 203, and the sensitization body is separated from the stress of the outer protective steel pipe 201, so that the temperature sensor packaging without external force influence is realized. The packaging method does not influence the sensing characteristic and has a certain protection effect.
Specifically, the optical fiber modem 4 is a tunable F-P cavity filter demodulation system, light emitted by the LED light source is incident to the FBG temperature sensor through the circulator, and light reflected by the FBG temperature sensor passes through the ringEntering an F-P cavity filter after the traveling device, adjusting the voltage applied to the piezoelectric ceramic of the F-P cavity filter, observing the change of the output voltage amplitude value of a photoelectric converter (PD), recording the voltage value applied to the piezoelectric ceramic when the voltage amplitude value reaches the maximum value, and calculating the resonant wavelength of the F-P cavity filter, the resonant wavelength of the F-P cavity filter and the lambda of the FBG temperature sensor influenced by the temperature by a numerical processing unit according to the voltage valueBIs consistent, according to the formula:
the variation of the ambient temperature can be detected. In the formula KTIs the temperature sensitivity coefficient of the FBG. Meanwhile, a region with a changed wavelength can be obtained, and the length of the region with the changed wavelength is the soil settlement value.
Preferably, the number of the optical fiber sensors 2, the thermal insulation disc 3 and the matching holes 301 is three, the chassis 1 is an equilateral triangle, and the equilateral triangle is provided with three mounting holes for connecting the three optical fiber sensors 2. The three heat insulation discs 3 lift along with the soil layer, and can reflect the settlement amount of the surface points of the three soil layers. And carrying out small-range surface fitting through the obtained numerical values. The severity of soil settlement can be further analyzed and reflected on the display module 5, and the soil at the serious settlement part can be further analyzed and corresponding measures can be taken. The monitoring result has accuracy and representativeness, the precision is high, the soil settlement of the soil layer can be effectively monitored, and the settlement value and the small-range curved surface soil settlement map can be quickly obtained. The monitoring device has the advantages of simple structure, convenient operation and low manufacturing cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Soil settlement monitoring and evaluation device based on FBG temperature sensor, its characterized in that includes:
the chassis (1) is buried in the soil to be detected;
the optical fiber sensors (2) are connected to the chassis (1) and extend upwards to the upper part of the soil layer, and the optical fiber sensors (2) generate corresponding wavelength change signals through temperature changes caused by soil layer settlement;
the optical fiber sensors (2) are arranged on the plurality of heat insulation discs (3) in a one-to-one correspondence mode, the heat insulation discs (3) are attached to the upper surface of a soil layer, the heat insulation discs (3) can move up and down along the optical fiber sensors (2), and the heat insulation discs (3) are used for blocking the influence of the external environment on the soil temperature;
the monitoring mechanism comprises optical fiber modulation and demodulation instruments (4) and a display module (5), wherein the optical fiber modulation and demodulation instruments (4) are electrically connected with the optical fiber sensors (2), the optical fiber modulation and demodulation instruments (4) are used for receiving wavelength change signals of the optical fiber sensors (2), generating corresponding soil settlement values and displaying the corresponding soil settlement values by means of the display module (5).
2. The FBG temperature sensor-based soil settlement monitoring and assessment device of claim 1, wherein the monitoring mechanism further comprises:
and the early warning module (6) is electrically connected with the optical fiber modem (4) to alarm when the soil settlement value exceeds a threshold value.
3. The FBG temperature sensor-based soil settlement monitoring and evaluating device of claim 2, further comprising:
and the workbench (7) is arranged on one side of the soil to be detected and is used for installing the optical fiber modem (4), the display module (5) and the early warning module (6).
4. The FBG temperature sensor-based soil settlement monitoring and evaluation device as claimed in claim 1, wherein the middle of the thermal insulation disc (3) is opened with a fitting hole (301), and the optical fiber sensor (2) penetrates through the corresponding fitting hole (301) so that the thermal insulation disc (3) moves up and down along the optical fiber sensor (2).
5. The FBG temperature sensor-based soil settlement monitoring and evaluating device according to claim 1, wherein a plurality of the optical fiber sensors (2) are provided with a protective cover (8) on top.
6. The FBG temperature sensor-based soil settlement monitoring and assessment device according to claim 5, wherein the protective cover (8) is of organic glass material.
7. The FBG temperature sensor-based soil settlement monitoring and evaluation device according to claim 1, wherein the chassis (1) is a viscoelastic corrosion resistant material.
8. The FBG temperature sensor-based soil settlement monitoring and assessment device according to any of claims 1-7, wherein the optical fiber sensor (2) is an FBG temperature sensor.
9. The FBG temperature sensor-based soil settlement monitoring and evaluation device of claim 8, wherein the FBG temperature sensor comprises:
the heat-conducting paste heat-conducting fiber grating comprises an outer protection steel pipe (201), wherein heat-conducting paste is filled in the outer protection steel pipe (201), a semi-cylindrical bent body (202) is arranged in the outer protection steel pipe (201), a bending part of the semi-cylindrical bent body (202) is provided with an installation groove along the axial direction of the outer protection steel pipe (201), and a fiber grating (203) is installed in the installation groove;
and the transmission optical fiber (204) penetrates through the outer protective steel pipe (201) and is electrically connected with the fiber grating (203).
10. The FBG temperature sensor-based soil settlement monitoring and assessment device according to any of the claims 1-7, wherein the fiber modem (4) is a tunable F-P cavity filter demodulation system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123042321.2U CN216283442U (en) | 2021-12-06 | 2021-12-06 | Soil settlement monitoring and evaluation device based on FBG temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123042321.2U CN216283442U (en) | 2021-12-06 | 2021-12-06 | Soil settlement monitoring and evaluation device based on FBG temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216283442U true CN216283442U (en) | 2022-04-12 |
Family
ID=81042531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123042321.2U Expired - Fee Related CN216283442U (en) | 2021-12-06 | 2021-12-06 | Soil settlement monitoring and evaluation device based on FBG temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216283442U (en) |
-
2021
- 2021-12-06 CN CN202123042321.2U patent/CN216283442U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4634856A (en) | Fiber optic moisture sensor with moisture-absorbing reflective target | |
| US20130022308A1 (en) | Multi-point pressure sensor and uses thereof | |
| CN101641621A (en) | Fiber optic sensor for detecting multiple parameters in a harsh environment | |
| CN203163913U (en) | Diaphragm type fiber bragg grating pressure sensor with temperature compensation | |
| CN101995485B (en) | Target fiber grating rheometer | |
| CN204228235U (en) | Based on the optical fiber continous way liquid level sensor system of CMFTIR effect | |
| BRPI0403240B1 (en) | optical transducer for simultaneous measurement of pressure and temperature in oil wells and method for said measurement | |
| CN110057426B (en) | Dark pool liquid level measurement system and method based on strain layer around Bragg grating | |
| WO2020250146A1 (en) | Method and system for detecting and measuring a braking force of a braking system for vehicle, by means of photonic sensors incorporated in a brake pad | |
| CN110044287A (en) | The combined long gauge length optical fibre grating strain transducer that prestressing force can be adjusted accurately | |
| CN114137273B (en) | Temperature-sensitive current eliminating sensing device of FBG cascade optical fiber composite structure | |
| CN212871539U (en) | Marine fiber grating temperature sensor | |
| CN216283442U (en) | Soil settlement monitoring and evaluation device based on FBG temperature sensor | |
| JP5354497B2 (en) | Distributed fiber optic pressure sensor system | |
| CN201034747Y (en) | Long period optical fiber grating counter modulation optical fiber grating high-temperature sensing system | |
| CN201034625Y (en) | Multiple parameter optical sensor | |
| Pang et al. | Development of high temperature acoustic emission sensing system using fiber Bragg grating | |
| CN211504168U (en) | Bridge structure health condition detection sensor | |
| CN107063393A (en) | A kind of level sensor system based on single mode multimode single-mode fiber structure and Bragg grating | |
| CN208111159U (en) | A kind of built-in fiber formula cable | |
| CN113137999A (en) | Optical fiber Bragg grating array type oil tank liquid level sensing system | |
| CN208968667U (en) | A kind of quasi-distributed acoustic detection sensor | |
| CN206573181U (en) | A kind of level sensor system based on single mode multimode single-mode fiber structure and Bragg grating | |
| CN114005558A (en) | FBG real-time leakage monitoring method and system for main steam pipeline of nuclear power station | |
| EP3913798B1 (en) | Thermal monitoring in laminate structures |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220412 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |