CN118090824A - Method for measuring soil heat flux by using distributed optical fibers - Google Patents
Method for measuring soil heat flux by using distributed optical fibers Download PDFInfo
- Publication number
- CN118090824A CN118090824A CN202410512099.7A CN202410512099A CN118090824A CN 118090824 A CN118090824 A CN 118090824A CN 202410512099 A CN202410512099 A CN 202410512099A CN 118090824 A CN118090824 A CN 118090824A
- Authority
- CN
- China
- Prior art keywords
- soil
- optical cable
- formula
- temperature
- optical
- 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.)
- Granted
Links
- 239000002689 soil Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000004907 flux Effects 0.000 title claims abstract description 34
- 239000013307 optical fiber Substances 0.000 title claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 94
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 22
- 230000004069 differentiation Effects 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 229920001817 Agar Polymers 0.000 claims description 6
- 239000008272 agar Substances 0.000 claims description 6
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 claims description 3
- 238000001069 Raman spectroscopy Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000010363 phase shift Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 abstract description 2
- 239000000835 fiber Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a method for measuring soil heat flux by using distributed optical fibers, which comprises the following steps: two optical cables are arranged in parallel in soil to be measured in the field and are divided into an optical cable A and an optical cable B; collecting the change of the temperature T of different spatial points of the optical cable B in the soil to be measured along with the time T; performing temperature calibration on the optical cable B; according to a radial heat conduction equation of the optical cable A, obtaining the thermal diffusivity and the volumetric heat capacity of the soil; obtaining the thermal conductivity of the soil based on the thermal diffusivity and the volumetric heat capacity; obtaining soil thermal inertia based on the soil thermal conductivity; and obtaining the soil heat flux based on the soil heat inertia. The method has important significance for the development of the soil heat flux measurement technology, and can provide more accurate data support for the surface energy balance and the surface evapotranspiration simulation.
Description
Technical Field
The invention relates to the field of heat pulse, in particular to a method for measuring soil heat flux by using a distributed optical fiber.
Background
Soil heat flux is one of the important parameters of surface energy balance, and has important influence on mass energy transmission and distribution between the ground and the air. Meanwhile, the soil heat flux is an important factor for simulating the surface evapotranspiration, and the simulation accuracy of the surface evapotranspiration can be greatly influenced. The soil heat flux has larger space variability under the influence of micro topography, local hydraulic and thermal characteristics of the soil and solar radiation. A common method for measuring soil heat flux is a spot-scale flux plate method, which can only perform single-point measurement and is not spatially representative. Therefore, there is a need to develop and optimize the measurement technique of soil heat flux.
Disclosure of Invention
The invention aims at a method for measuring soil heat flux by using distributed optical fibers, and realizes high spatial resolution (0.25 m) monitoring of soil hydrothermal parameters by using two parallel optical fibers, thereby improving the measurement precision and range of soil volume weight.
The technical scheme adopted by the invention is as follows: a method for measuring soil heat flux by using a distributed optical fiber, comprising the following steps:
step S1: two optical cables are arranged in parallel in soil to be measured in the field and are divided into an optical cable A and an optical cable B, wherein the optical cable A is a heat source optical cable, and the optical cable B is a temperature sensing optical cable;
Step S2: acquiring the change of the temperature T of different spatial points of the optical cable B in the soil to be detected along with the time T by using an optical signal demodulation module DTS;
Step S3: performing temperature calibration on the optical cable B, and performing temperature calibration on an optional position selected by the optical cable B;
step S4: after the temperature calibration is finished, calculating a heating value for the cable B;
Step S5: the optical cable A is used as a linear heat source to meet the condition of a radial heat conduction equation, partial differentiation is carried out on the radial heat conduction equation, and the partial differentiation is equal to zero, so that the soil thermal diffusivity and the volumetric heat capacity are obtained;
Step S6: obtaining thermal conductivity based on the soil thermal diffusivity and the volumetric heat capacity in step S5;
step S7: obtaining soil thermal inertia based on the soil thermal conductivity;
Step S8: obtaining soil heat flux based on soil heat inertia;
Wherein the soil heat flux in the step S8 is obtained by the formula (1);
（1）；
Wherein G is soil heat flux; i is soil thermal inertia; n is the number of times; m is the total number of harmonics used; a n is the amplitude of the nth harmonic; omega is the angular frequency; t is time; is the phase shift of the nth harmonic; a n And obtaining the temperature data monitored by the harmonic analysis optical signal demodulation module DTS.
Further, in the step S1, the center distance r 0 between the optical cable A and the optical cable B is about 6mm, and the structure of the optical cable comprises an insulating sheath, a metal layer and an optical fiber from outside to inside; the method comprises the following steps:
electrifying a metal layer of the optical cable A with the length of l within a preset time to generate Joule heat, wherein the heating power q of the optical cable A is obtained through the resistance R of the metal layer and the voltage U recorded in real time; q=u 2/(l×r).
Further, in step S3, a position of the optical cable B is selected to perform temperature calibration; represented by formula (2);
（2）；
In the method, in the process of the invention, The temperature after the calibration is the temperature of any position z; gamma is the energy offset between the photons of the incident laser wavelength and the scattered raman photons,The light intensity ratio of the arbitrary position z; j is a dimensionless calibration parameter on the optical cable B, and is related to the attribute of the DTS instrument of the incident laser and optical signal demodulation module; Δα is the differential attenuation between the anti-stokes signal and the stokes signal in cable B;
Wherein order Gamma, C and delta alpha are obtained by the formula (3), the formula (4) and the formula (5);
（3）；
（4）；
（5）；
In the method, in the process of the invention, 、、The temperature vector, the parameter vector and the light intensity ratio vector are respectively;、 And Respectively the different positions of the optical cable B、AndA corresponding temperature;、 And Respectively at different positions on the optical cable B、AndA corresponding light intensity ratio; defining different locations on fiber optic cable B、AndThe distance is far enough.
Further, in step S4, a temperature rise value is calculated for the optical fiber B;
（6）；
In the method, in the process of the invention, The temperature rise value at the time t of the optical cable B; And The resulting slope and intercept were linearly fitted to the temperature data for 5 minutes before heating and 20 minutes after heating was completed.
Further, in step S5, the radial heat conduction equation is specifically shown in equation (7) and equation (8):
（7）；
（8）；
Wherein the limitation in the formula (7) is that 0.ltoreq.t.ltoreq. The constraint in equation (8) is t >0; t is time; t 0 is the heating time of the heat source, and is set to 10 minutes;
、 The temperature increment of the heating stage and the cooling stage respectively; r 0 is the distance from the temperature sensing optical cable B to the linear heat source optical cable; q is the thermal strength per unit time; q=q/C, C being the volumetric heat capacity of the medium; k is thermal diffusivity; e i (-x) is an exponential integral function;
The distance r 0 between the optical cables A and B is equal to the theoretical distance r 0 'obtained through agar calibration, and r 0' can be obtained by fitting formulas (7) and (8) because the thermal diffusivity and the volumetric heat capacity of agar are known.
Partial differentiation is carried out on parameters in a radial heat conduction equation, and the parameters in the radial heat conduction equation are enabled to be equal to zero, so that the thermal diffusivity and the volumetric heat capacity of the medium are obtained; specifically, partial differentiation is performed on the time t in the formula (7) and the formula (8), as shown in the formula (9) and the formula (10):
（9）；
（10）；
Wherein k is thermal diffusivity, and C is volumetric heat capacity of the medium; The maximum heating value of the optical cable B; t m is the time corresponding to the maximum temperature rise value of the optical cable B.
Further, the thermal conductivity of the soil is obtained based on the thermal diffusivity and the volumetric heat capacity of the medium in step S5; obtained by the formula (11):
(11)；
Where λ is the thermal conductivity of the soil.
Further, the thermal inertia of the soil is obtained based on the thermal conductivity of the soil; Obtained by the formula (12):
（12）。
The beneficial effects of the invention are as follows: the invention mainly provides a method for measuring the soil heat flux by using a distributed optical fiber, which calculates the soil heat inertia by a heat pulse method and analyzes the soil temperature monitored by the optical fiber by combining a harmonic method so as to estimate the soil heat flux.
Drawings
FIG. 1 is a schematic diagram of the fiber optic soil heat flux measurement of the present invention.
Detailed Description
The technical scheme adopted by the invention is as follows: a method for measuring soil heat flux by using a distributed optical fiber, comprising the following steps:
step S1: two optical cables are arranged in parallel in soil to be measured in the field and are divided into an optical cable A and an optical cable B, wherein the optical cable A is a heat source optical cable, and the optical cable B is a temperature sensing optical cable;
Step S2: acquiring the change of the temperature T of different spatial points of the optical cable B in the soil to be detected along with the time T by using an optical signal demodulation module DTS;
Step S3: performing temperature calibration on the optical cable B, and performing temperature calibration on an optional position selected by the optical cable B;
step S4: after the temperature calibration is finished, calculating a heating value for the cable B;
Step S5: the optical cable A is used as a linear heat source to meet the condition of a radial heat conduction equation, partial differentiation is carried out on the radial heat conduction equation, and the partial differentiation is equal to zero, so that the soil thermal diffusivity and the volumetric heat capacity are obtained;
Step S6: obtaining thermal conductivity based on the soil thermal diffusivity and the volumetric heat capacity in step S5;
step S7: obtaining soil thermal inertia based on the soil thermal conductivity;
Step S8: obtaining soil heat flux based on soil heat inertia;
Wherein the soil heat flux in the step S8 is obtained by the formula (1);
（1）；
Wherein G is soil heat flux; i is soil thermal inertia; n is the number of times; m is the total number of harmonics used; a n is the amplitude of the nth harmonic; omega is the angular frequency; t is time; is the phase shift of the nth harmonic; a n And obtaining the temperature data monitored by the harmonic analysis optical signal demodulation module DTS.
Further, in the step S1, the center distance r 0 between the optical cable A and the optical cable B is about 6mm, and the structure of the optical cable comprises an insulating sheath, a metal layer and an optical fiber from outside to inside; the method comprises the following steps:
electrifying a metal layer of the optical cable A with the length of l within a preset time to generate Joule heat, wherein the heating power q of the optical cable A is obtained through the resistance R of the metal layer and the voltage U recorded in real time; q=u 2/(l×r).
Further, in step S3, a position of the optical cable B is selected to perform temperature calibration; represented by formula (2);
（2）；
In the method, in the process of the invention, The temperature after the calibration is the temperature of any position z; gamma is the energy offset between the photons of the incident laser wavelength and the scattered raman photons,The light intensity ratio of the arbitrary position z; j is a dimensionless calibration parameter on the optical cable B, and is related to the attribute of the DTS instrument of the incident laser and optical signal demodulation module; Δα is the differential attenuation between the anti-stokes signal and the stokes signal in cable B;
Wherein order Gamma, C and delta alpha are obtained by the formula (3), the formula (4) and the formula (5);
（3）；
（4）；
（5）；
In the method, in the process of the invention, 、、The temperature vector, the parameter vector and the light intensity ratio vector are respectively;、 And Respectively the different positions of the optical cable B、AndA corresponding temperature;、 And Respectively at different positions on the optical cable B、AndA corresponding light intensity ratio; defining different locations on fiber optic cable B、AndThe distance is far enough.
Further, in step S4, a temperature rise value is calculated for the optical fiber B;
（6）；
In the method, in the process of the invention, The temperature rise value at the time t of the optical cable B; And The resulting slope and intercept were linearly fitted to the temperature data for 5 minutes before heating and 20 minutes after heating was completed.
Further, in step S5, the radial heat conduction equation is specifically shown in equation (7) and equation (8):
（7）；
（8）；
Wherein the limitation in the formula (7) is that 0.ltoreq.t.ltoreq. The constraint in equation (8) is t >0; t is time; t 0 is the heating time of the heat source, and is set to 10 minutes;
、 The temperature increment of the heating stage and the cooling stage respectively; r 0 is the distance from the temperature sensing optical cable B to the linear heat source optical cable; q is the thermal strength per unit time; q=q/C, C being the volumetric heat capacity of the medium; k is thermal diffusivity; e i (-x) is an exponential integral function;
The distance r 0 between the optical cables A and B is equal to the theoretical distance r 0 'obtained through agar calibration, and r 0' can be obtained by fitting formulas (7) and (8) because the thermal diffusivity and the volumetric heat capacity of agar are known.
Partial differentiation is carried out on parameters in a radial heat conduction equation, and the parameters in the radial heat conduction equation are enabled to be equal to zero, so that the thermal diffusivity and the volumetric heat capacity of the medium are obtained; specifically, partial differentiation is performed on the time t in the formula (7) and the formula (8), as shown in the formula (9) and the formula (10):
（9）；
（10）；
Wherein k is thermal diffusivity, and C is volumetric heat capacity of the medium; The maximum heating value of the optical cable B; t m is the time corresponding to the maximum temperature rise value of the optical cable B.
Further, the thermal conductivity of the soil is obtained based on the thermal diffusivity and the volumetric heat capacity of the medium in step S5; obtained by the formula (11):
(11)；
Where λ is the thermal conductivity of the soil.
Further, the thermal inertia of the soil is obtained based on the thermal conductivity of the soil; Obtained by the formula (12):
（12）。
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for measuring soil heat flux by using a distributed optical fiber, which is characterized by comprising the following steps: the method comprises the following steps:
step S1: two optical cables are arranged in parallel in soil to be measured in the field and are divided into an optical cable A and an optical cable B, wherein the optical cable A is a heat source optical cable, and the optical cable B is a temperature sensing optical cable;
Step S2: acquiring the change of the temperature T of different spatial points of the optical cable B in the soil to be detected along with the time T by using an optical signal demodulation module DTS;
Step S3: performing temperature calibration on the optical cable B, and performing temperature calibration on an optional position selected by the optical cable B;
step S4: after the temperature calibration is finished, calculating a heating value for the cable B;
Step S5: the optical cable A is used as a linear heat source to meet the condition of a radial heat conduction equation, partial differentiation is carried out on the radial heat conduction equation, and the partial differentiation is equal to zero, so that the soil thermal diffusivity and the volumetric heat capacity are obtained;
Step S6: obtaining thermal conductivity based on the soil thermal diffusivity and the volumetric heat capacity in step S5;
step S7: obtaining soil thermal inertia based on the soil thermal conductivity;
Step S8: obtaining soil heat flux based on soil heat inertia;
Wherein the soil heat flux in the step S8 is obtained by the formula (1);
（1）；
Wherein G is soil heat flux; i is soil thermal inertia; n is the number of times; m is the total number of harmonics used; a n is the amplitude of the nth harmonic; omega is the angular frequency; t is time; Is the phase shift of the nth harmonic; a n and/> And obtaining the temperature data monitored by the harmonic analysis optical signal demodulation module DTS.
2. A method of measuring soil heat flux using a distributed optical fiber according to claim 1, wherein: in the step S1, the center distance r 0 between the optical cable A and the optical cable B is about 6mm, and the structure of the optical cable comprises an insulating sheath, a metal layer and optical fibers from outside to inside; the method comprises the following steps:
electrifying a metal layer of the optical cable A with the length of l within a preset time to generate Joule heat, wherein the heating power q of the optical cable A is obtained through the resistance R of the metal layer and the voltage U recorded in real time; q=u 2/(l×r).
3. A method of measuring soil heat flux using a distributed optical fiber according to claim 2, wherein: step S3, selecting an arbitrary position on the optical cable B for temperature calibration; represented by formula (2);
（2）；
In the method, in the process of the invention, The temperature after the calibration is the temperature of any position z; gamma is the energy offset between the incident laser wavelength photon and the scattered raman photon,/>The light intensity ratio of the arbitrary position z; j is a dimensionless calibration parameter on the optical cable B, and is related to the attribute of the DTS instrument of the incident laser and optical signal demodulation module; Δα is the differential attenuation between the anti-stokes signal and the stokes signal in cable B;
Wherein order Gamma, C and delta alpha are obtained by the formula (3), the formula (4) and the formula (5);
（3）；
（4）；
（5）；
In the method, in the process of the invention, 、/>、/>The temperature vector, the parameter vector and the light intensity ratio vector are respectively; /(I)、/>And/>Respectively the different positions/>, of the optical cable B、/>And/>A corresponding temperature; /(I)、/>And/>Respectively the different positions/>, on the optical cable B、/>And/>A corresponding light intensity ratio; definition of different locations/>, on optical cable B、/>And/>The distance is far enough.
4. A method of measuring soil heat flux using a distributed optical fiber according to claim 3, wherein: in the step S4, calculating a heating value of the cable B;
（6）；
In the method, in the process of the invention, The temperature rise value at the time t of the optical cable B; /(I)And/>The resulting slope and intercept were linearly fitted to the temperature data for 5 minutes before heating and 20 minutes after heating was completed.
5. The method for measuring soil heat flux by using the distributed optical fiber according to claim 4, wherein:
In step S5, the radial heat conduction equation is specifically shown in formula (7) and formula (8):
（7）；
（8）；
Wherein the limitation in the formula (7) is that 0.ltoreq.t.ltoreq. The constraint in equation (8) is t >0; t is time; t 0 is the heating time of the heat source, and is set to 10 minutes;
、/> The temperature increment of the heating stage and the cooling stage respectively; r 0 is the distance from the temperature sensing optical cable B to the linear heat source optical cable; q is the thermal strength per unit time; q=q/C, C being the volumetric heat capacity of the medium; k is thermal diffusivity; e i (-x) is an exponential integral function;
The distance r 0 between the optical cables A and B is equal to the theoretical distance r 0 'obtained through agar calibration, and r 0' can be obtained by fitting formulas (7) and (8) because the thermal diffusivity and the volume heat capacity of agar are known;
Partial differentiation is carried out on parameters in a radial heat conduction equation, and the parameters in the radial heat conduction equation are enabled to be equal to zero, so that the thermal diffusivity and the volumetric heat capacity of the medium are obtained; specifically, partial differentiation is performed on the time t in the formula (7) and the formula (8), as shown in the formula (9) and the formula (10):
（9）；
（10）；
Wherein k is thermal diffusivity, and C is volumetric heat capacity of the medium; The maximum heating value of the optical cable B; t m is the time corresponding to the maximum temperature rise value of the optical cable B.
6. The method for measuring soil heat flux by using the distributed optical fiber according to claim 5, wherein: obtaining the thermal conductivity of the soil based on the thermal diffusivity and the volumetric heat capacity of the medium in step S5; obtained by the formula (11):
(11)；
Where λ is the thermal conductivity of the soil.
7. A method of measuring soil heat flux using a distributed optical fiber as claimed in claim 6, wherein: obtaining soil thermal inertia based on soil thermal conductivity; Obtained by the formula (12):
（12）。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410512099.7A CN118090824B (en) | 2024-04-26 | 2024-04-26 | Method for measuring soil heat flux by using distributed optical fibers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410512099.7A CN118090824B (en) | 2024-04-26 | 2024-04-26 | Method for measuring soil heat flux by using distributed optical fibers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118090824A true CN118090824A (en) | 2024-05-28 |
| CN118090824B CN118090824B (en) | 2024-07-30 |
Family
ID=91165606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410512099.7A Active CN118090824B (en) | 2024-04-26 | 2024-04-26 | Method for measuring soil heat flux by using distributed optical fibers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118090824B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2577160A1 (en) * | 2002-06-21 | 2003-12-31 | Schlumberger Canada Limited | Method for measuring and calibrating measurements using optical fiber distributed sensor |
| US20100128756A1 (en) * | 2007-07-18 | 2010-05-27 | Chung Lee | Dual source auto-correction in distributed temperature systems |
| CN202177622U (en) * | 2011-08-10 | 2012-03-28 | 上海泽泉科技有限公司 | Soil heat flux remote monitoring and early warning device |
| US20190094165A1 (en) * | 2017-09-20 | 2019-03-28 | Aiq Dienstleistungen Ug (Haftungsbeschränkt) | Condition Monitoring of an Object |
| CN110687160A (en) * | 2019-09-17 | 2020-01-14 | 中国石油天然气股份有限公司 | Soil detection device and method |
| CN110988045A (en) * | 2019-12-24 | 2020-04-10 | 西安理工大学 | Soil body conductivity measuring method based on active heating optical fiber method |
| CN117074458A (en) * | 2023-05-04 | 2023-11-17 | 江西省水利科学院(江西省大坝安全管理中心、江西省水资源管理中心) | Method for synchronously measuring soil hydrothermal parameters by heating optical fibers in distributed mode |
| CN117607200A (en) * | 2023-11-09 | 2024-02-27 | 南京大学 | Soil nail defect parameter detection device and method based on active heating optical fiber sensing |
-
2024
- 2024-04-26 CN CN202410512099.7A patent/CN118090824B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2577160A1 (en) * | 2002-06-21 | 2003-12-31 | Schlumberger Canada Limited | Method for measuring and calibrating measurements using optical fiber distributed sensor |
| US20100128756A1 (en) * | 2007-07-18 | 2010-05-27 | Chung Lee | Dual source auto-correction in distributed temperature systems |
| CN202177622U (en) * | 2011-08-10 | 2012-03-28 | 上海泽泉科技有限公司 | Soil heat flux remote monitoring and early warning device |
| US20190094165A1 (en) * | 2017-09-20 | 2019-03-28 | Aiq Dienstleistungen Ug (Haftungsbeschränkt) | Condition Monitoring of an Object |
| CN110687160A (en) * | 2019-09-17 | 2020-01-14 | 中国石油天然气股份有限公司 | Soil detection device and method |
| CN110988045A (en) * | 2019-12-24 | 2020-04-10 | 西安理工大学 | Soil body conductivity measuring method based on active heating optical fiber method |
| CN117074458A (en) * | 2023-05-04 | 2023-11-17 | 江西省水利科学院(江西省大坝安全管理中心、江西省水资源管理中心) | Method for synchronously measuring soil hydrothermal parameters by heating optical fibers in distributed mode |
| CN117607200A (en) * | 2023-11-09 | 2024-02-27 | 南京大学 | Soil nail defect parameter detection device and method based on active heating optical fiber sensing |
Non-Patent Citations (4)
| Title |
|---|
| JAVIER BENÍTEZ-BUELGA ET AL.: "Heated Fiber Optic Distributed Temperature Sensing: A Dual-Probe Heat-Pulse Approach", VADOSE ZONE JOURNAL, vol. 13, no. 11, 10 November 2014 (2014-11-10), pages 1 - 10 * |
| 杨红娟等: "利用遥测地表温度模拟土壤热通量", 《干旱区研究》, vol. 26, no. 01, 31 January 2009 (2009-01-31), pages 21 - 25 * |
| 胡优: "基于分布式加热光纤的土壤水热性质测定及作物精准灌溉研究", 《中国博士学位论文全文数据库农业科技辑》, no. 04, 15 April 2024 (2024-04-15), pages 14 - 16 * |
| 阳坤等: "一种基于土壤温湿资料计算地表土壤热通量的温度预报校正法", 中国科学(D辑:地球科学), vol. 38, no. 02, 29 February 2008 (2008-02-29), pages 243 - 250 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118090824B (en) | 2024-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yu et al. | Thermal response test and numerical analysis based on two models for ground-source heat pump system | |
| CN108107074B (en) | Double-pulse flash Raman method and system for representing thermophysical properties of two-dimensional nano material | |
| CN112378616B (en) | High-speed flow field multi-parameter measurement system and method based on wavelength modulation absorption spectrum | |
| CN103134833B (en) | A kind of material heat transfer analysis device based on fluorescence method | |
| Duarte | Direct temperature gradient measurement using interferometry | |
| CN117074458A (en) | Method for synchronously measuring soil hydrothermal parameters by heating optical fibers in distributed mode | |
| CN102749141A (en) | Radiation temperature measuring method and apparatus for measuring true target temperature | |
| CN109580033A (en) | A kind of concrete dam distributed optical fiber temperature measurement data error compensation method | |
| Gifford et al. | Convection calibration of Schmidt–Boelter heat flux gauges in stagnation and shear air flow | |
| CN106248245B (en) | Distributed optical fiber temperature measuring method under a kind of complex environment | |
| CN114279597A (en) | High-precision low-power radiant heat flow meter capable of being used for radiant heat flow tracing calibration | |
| CN118090824B (en) | Method for measuring soil heat flux by using distributed optical fibers | |
| Schreivogel et al. | Optical convective heat transfer measurements using infrared thermography and frequency domain phosphor thermometry | |
| Li et al. | Laser based method for dynamic calibration of thermocouples | |
| Edwards et al. | The Determination of Photon Flux for Energies between 150 and 300 Mev | |
| CN103256999B (en) | Distributed type optical fiber temperature measuring method | |
| Wen et al. | Prediction of the coupled heat radiation and conduction parameters and boundary condition using the unscented Kalman filter | |
| Cho et al. | Steady-state and frequency response of a thin-film heat flux gauge | |
| CN114383712B (en) | High-temperature calibration method and device for sensitivity of vibration sensor | |
| CN115060187A (en) | Distributed optical fiber strain sensing performance detection system and method | |
| CN207832350U (en) | Temperature sensor high speed Calibration of Dynamic device | |
| Tang et al. | In-situ measurement and self-calibration system for high-power laser energy in ICF facilities | |
| CN118090822B (en) | Method for synchronously measuring soil thermal characteristics and water content by double-probe thermal pulse optical fibers | |
| Hubble et al. | Development and evaluation of the time-resolved heat and temperature array | |
| CN118090821A (en) | Method for measuring soil evaporation by using distributed optical fibers |
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 |