CN111256868A - Pipeline fluid temperature sensor based on fiber bragg grating - Google Patents
Pipeline fluid temperature sensor based on fiber bragg grating Download PDFInfo
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- CN111256868A CN111256868A CN201911280926.XA CN201911280926A CN111256868A CN 111256868 A CN111256868 A CN 111256868A CN 201911280926 A CN201911280926 A CN 201911280926A CN 111256868 A CN111256868 A CN 111256868A
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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
- G01K11/3206—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 at discrete locations in the fibre, e.g. using Bragg scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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Abstract
The invention discloses a pipeline fluid temperature sensor based on fiber bragg grating, which is characterized in that an optical fiber sleeved with a capillary copper pipe is arranged at the bottom of a probe, and two ends of the capillary copper pipe are sealed by AB glue; the alumina powder is used for filling the gap between the capillary copper tube and the probe, so that the wavelength fluctuation caused by the vibration of the probe is reduced; the probe is sealed by AB glue so as to prevent liquid in the pipeline from permeating; the optical fiber at the other end of the probe port is sleeved with an optical fiber sleeve and a corrosion-resistant heat-shrinkable tube layer by layer, so that the optical fiber cannot be corroded by the stock solution; the probe and the armored sensor shell are screwed to prevent liquid in the pipeline from permeating, the optical fiber sleeved with the heat-shrinkable tube is fixedly connected with an optical fiber jumper through a pipeline joint, and the signal transmission optical fiber is subjected to protective input and output through a round hole of the armored shell. The pipeline fluid temperature sensor of the invention protects the fiber grating to the maximum extent, realizes that the grid region part keeps a free state and is not influenced by external stress, thereby ensuring the single influence of temperature on wavelength and improving the measurement precision and stability.
Description
Technical Field
The invention relates to the fields of sensor structures, computers, information science, testing technologies and the like, in particular to a pipeline fluid temperature sensor based on fiber bragg gratings.
Background
Thermal resistors are often used for measuring the temperature of pipeline fluid in chemical production, and the accuracy of a result is influenced when the temperature of the pipeline fluid is accurately measured due to the problems that the resistors have heat dissipation and current heat effect, the pipeline path possibly influences the complete immersion of the resistors and the like; and along with the rise of temperature, the nonlinearity of thermal resistance is more and more serious, needs regularly to calibrate, can't satisfy long-term monitoring, has greatly improved manufacturing cost. The fiber grating temperature sensor acquires temperature information through light waves by utilizing the principle that temperature can affect the absorption spectrum of a substance. And the raw material of the optical fiber is silicon dioxide, so that the optical fiber has the advantages of wide raw material, low cost, strong anti-electromagnetic interference capability, capability of realizing real-time monitoring in strong acid, strong alkali and strong corrosive environments and high stability.
The common fiber grating has poor tensile and bending resistance under the naked condition, and the fiber grating has poor temperature resistance, when the working temperature is higher than the heat-resistant temperature of the fiber grating, the central wavelength of the grating can generate large drift, which leads to the reduction of the wavelength precision of the fiber grating, so the packaging protection of the fiber grating is very necessary. Common packaging types are surface, immersion, embedded, etc.
At present, the prior art mostly selects packaging materials for solving the problem. For example, patent application No. 201811506252.6 discloses a fiber grating temperature sensor, which uses a temperature sensing metal housing, a glass protective sleeve; and the patent with the application number of 201822065710.9 discloses that the fiber grating temperature sensor is realized by fixedly connecting ceramic ferrules and the like at the top and the bottom of the inner cavity of the fiber grating shell. However, these methods are not only expensive, but also difficult and complicated to implement.
Disclosure of Invention
The invention aims to provide a fiber grating temperature sensor which has the advantages of good packaging effect, wide temperature measuring range and high measuring precision, and solves the problems that the common fiber grating is poor in tensile and bending resistance under the naked condition, the central wavelength of the grating generates large drift due to the fact that the working temperature is higher than the heat-resistant temperature of the fiber grating, and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an optical fiber Bragg grating temperature sensor which comprises an armored sensor shell, AB glue, a capillary copper pipe, a probe, a pipeline joint, an optical Fiber Bragg Grating (FBG), sealant and alumina powder, wherein the AB glue is arranged on the armored sensor shell; the sensor places the optical fiber sleeved with the capillary copper tube at the bottom of the probe, and the two ends of the capillary copper tube are sealed by AB glue; the alumina powder is used for filling the gap between the capillary copper tube and the probe, so that the wavelength fluctuation caused by the vibration of the probe is reduced; the probe is sealed by AB glue so as to prevent liquid in the pipeline from permeating; the optical fiber at the other end of the probe port is sleeved with an optical fiber sleeve and a corrosion-resistant heat shrinkable tube layer by layer to ensure that the optical fiber cannot be corroded by the stock solution; the probe is screwed with the armored sensor shell to prevent liquid in the pipeline from permeating, the optical fiber sleeved with the heat-shrinkable tube is fixedly connected with the optical fiber jumper through the pipeline joint, and the signal transmission optical fiber is subjected to protective input and output through the round hole of the armored shell, so that the fiber bragg grating is protected to the maximum extent, the grid region part is kept in a free state, and the influence of external stress is avoided.
In the scheme, the length of the grating region of the fiber Bragg grating is less than 6mm, and the grating part is not provided with a coating layer so as to reduce the low-temperature chirp phenomenon of the fiber Bragg grating caused by the non-uniform distribution of the strain of the grating region; and the grating part is positioned in the central area of the stainless steel capillary tube to ensure the uniformity and stability of the heat transfer process.
In the scheme, the capillary copper tube is a 304L stainless capillary tube, the inner diameter of the capillary copper tube is 3mm, and the capillary copper tube is 0.5mm thicker than the fiber grating with the diameter of 2.5mm, so that the optical fiber is effectively prevented from shaking.
In the scheme, the two ends of the capillary copper pipe are both provided with the sealant, the optical fiber is only fixed with one end of the capillary copper pipe, and the other end of the optical fiber is free. Therefore, the fiber grating in the capillary copper tube is kept in a free state, and one end of the fiber grating is fixed by the sealant, so that the wavelength of the fiber grating is not changed due to external stress, and the influence of stress is basically eliminated.
In the scheme, the alumina powder is filled between the probe and the capillary copper tube, so that the wavelength fluctuation caused by the vibration of the probe is reduced.
In the scheme, the pipeline joint is the optical fiber flange plate, so that the stability of a light path after the pipeline joint is connected can be effectively ensured, and the optical loss is reduced.
In the above scheme, the sensor protective housing is cylindrical armor explosion-proof type.
Compared with the prior art, the invention has the following remarkable advantages: 1. according to the invention, the inner diameter of the capillary copper pipe of the optical fiber protective sleeve is only 0.5mm larger than the diameter of the optical fiber, so that the optical fiber is kept in an upright state, and the influence of wavelength change caused by vibration on a test result is avoided while the optical fiber is protected; 2. in optical fiber packaging, one free end of an optical fiber in a capillary copper pipe is fixed, so that the optical fiber can be fixed, and the phenomenon that the temperature measurement result of an internal optical fiber grating is influenced due to deformation caused by external protection stress is avoided; 3. the optical fiber at the outlet is fixed by using the AB glue (the stripped part of the optical fiber protective film), so that the optical fiber grating is prevented from moving greatly due to external stress, and the accuracy and the stability of temperature measurement are ensured. The sensor obtained by the invention has the characteristics of universality, high efficiency and the like, and the single influence of temperature on wavelength is ensured, so that the measurement precision and stability are improved.
Drawings
FIG. 1 is a front sectional view of a schematic structure of the present invention.
FIG. 2 is a temperature test calibration chart of the present invention.
In the figure: stainless steel armor shell 1, AB glue 2, capillary copper pipe 3, optic fibre 4, Fiber Bragg Grating (FBG)5, sealed glue 6, aluminium oxide powder 7.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in fig. 1, an optical fiber bragg grating temperature sensor for measuring temperature includes a stainless steel armor shell 1, an AB glue 2, a capillary copper tube 3, an optical fiber 4, an optical Fiber Bragg Grating (FBG)5, a sealant 6, alumina powder 7, and a probe.
The FBG temperature sensor mainly comprises a corrosion-resistant steel probe, 3 parts including an FBG optical fiber 4 and a capillary copper tube 3, wherein the capillary copper tube 3 is sleeved with a grating 5 part of the optical fiber, two ends of the capillary copper tube 3 are sealed by a sealant 6, in order to prevent the deformation of the capillary steel tube and the generation of optical fiber stretching due to the simultaneous action of temperature and applied stress strain, the optical fiber is packaged in the capillary copper tube 3, and the length of a reserved part of the optical fiber is reserved (the capillary copper tube 3 adopts a 304L stainless capillary tube with the length of 30 mm). The optical fiber 4 sleeved with the capillary copper tube 3 is arranged at the bottom of the probe, the alumina powder 7 is used for filling the gap between the capillary copper tube 3 and the probe, the wavelength fluctuation caused by the vibration of the probe is reduced, and the whole probe is sealed by the AB glue 2, so that the liquid in the pipeline is prevented from permeating. And the optical fiber 4 at the other end of the probe port is sleeved layer by using an optical fiber sleeve and a corrosion-resistant heat-shrinkable tube to ensure that the optical fiber 4 cannot be corroded by the stock solution, and finally the probe and the armored sensor shell 1 are screwed down.
The optical fiber 4 is fixed with one end of the capillary copper tube 3 by sealant 6. Because the test result is most easily influenced by the deformation of the fiber bragg grating to cause the change of the absorption wavelength when the fiber bragg grating temperature sensor is manufactured under the general condition, if both ends are fixed, the fiber bragg grating 5 may have errors caused by the relative inevitable extension or shortening of the fiber bragg grating 5 due to the different degrees of the thermal expansion and the cold contraction of the capillary copper tube 3 and the fiber bragg grating 5 when the temperature is measured; in the present invention, only one end is fixed, so that the error is solved, the precision of the test result is improved, and the service life of the equipment is prolonged.
In the FBG packaging structure, a capillary copper tube 3 with the inner diameter of 3mm is embedded with an optical fiber 4 with the diameter of 2.5mm and provided with an optical fiber Bragg grating 5, and the gap between the capillary copper tube 3 and the optical fiber is only 0.5 mm. If the optical fiber grating 5 is shaken from the outside, the optical fiber grating can still keep the upright state, and the test result is prevented from being influenced by bending.
The length of the grating region of a Fiber Bragg Grating (FBG)5 is less than 6 mm.
In the specific implementation, the optical fiber 4 is firstly stripped from part of the optical fiber protective film, and then the AB glue 2 is pasted on the right center of the probe mouth along the radial direction for measuring the temperature of the fluid in the measuring pipeline. The AB glue 2 holds the fiber 4 in place and protects the core fiber grating 5.
The sensor of the invention is tested, the test result is shown in figure 2, the sensor of the invention and a temperature instrument with the resolution ratio of 0.01 ℃ are closely attached and placed in a constant temperature box capable of heating and keeping constant temperature, the temperature range of the constant temperature box is set to be 15 ℃ to 35 ℃, the temperature is raised by 5 ℃ every time, and the indication number of the temperature instrument and the central wavelength value of the FBG are recorded after the temperature is stable. From the results, the linear fitting coefficient was 0.9996, the linearity was good, the short-term accuracy was about 0.09 ℃, and the sensitivity was good.
In conclusion, the invention can meet the requirements of accurate monitoring and long-term monitoring of the temperature of the pipeline fluid.
Finally, it should be noted that: the above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A fiber grating-based pipeline fluid temperature sensor, comprising: the sensor comprises an armored sensor shell, AB glue, a capillary copper pipe, a probe, a pipeline joint, an optical fiber Bragg grating, sealant and alumina powder; wherein, the optical fiber sleeved with the capillary copper tube is arranged at the bottom of the probe, and two ends of the capillary copper tube are sealed by AB glue; the alumina powder is used for filling the gap between the capillary copper tube and the probe, so that the wavelength fluctuation caused by the vibration of the probe is reduced; the probe is sealed by AB glue so as to prevent liquid in the pipeline from permeating; the optical fiber at the other end of the probe port is sleeved with an optical fiber sleeve and a corrosion-resistant heat shrinkable tube layer by layer to ensure that the optical fiber cannot be corroded by the stock solution; the probe is screwed with the armored sensor shell to prevent liquid in the pipeline from permeating, the optical fiber sleeved with the heat-shrinkable tube is fixedly connected with the optical fiber jumper through the pipeline joint, and the signal transmission optical fiber is subjected to protective input and output through the round hole of the armored shell, so that the grid region part is kept in a free state and is not influenced by external stress.
2. The fiber bragg grating based pipe fluid temperature sensor according to claim 1, wherein the grating region length of the fiber bragg grating is less than 6mm, and the grating portion is not coated; and the grating part is positioned in the central area of the stainless steel capillary tube to ensure the uniformity and stability of the heat transfer process.
3. The fiber grating-based pipeline fluid temperature sensor according to claim 1, wherein the capillary copper tube is a 304L stainless capillary tube, and the inner diameter of the capillary copper tube is 3mm, which is only 0.5mm thicker than the diameter of the fiber grating, which is 2.5mm, so that the optical fiber is effectively prevented from shaking.
4. The fiber grating-based pipeline fluid temperature sensor according to claim 1, wherein the capillary copper tube has two ends each having a sealant, and the optical fiber is fixed to only one end of the capillary copper tube, and the other end is free; so that the fiber grating in the capillary copper tube is kept in a free state, and one end of the fiber grating is fixed by the sealant.
5. The fiber grating-based pipeline fluid temperature sensor according to claim 1, wherein alumina powder is filled between the probe and the capillary copper tube to reduce wavelength fluctuation caused by vibration of the probe.
6. The fiber grating-based pipeline fluid temperature sensor according to claim 1, wherein the pipeline joint is a fiber flange, so as to ensure the stability of the optical path after the connection and reduce optical loss.
7. The fiber grating-based pipeline fluid temperature sensor of claim 1, wherein the sensor protective housing is of a cylindrical armored explosion-proof type.
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| CN201911280926.XA CN111256868B (en) | 2019-12-13 | 2019-12-13 | Pipeline fluid temperature sensor based on fiber bragg grating |
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| CN201911280926.XA CN111256868B (en) | 2019-12-13 | 2019-12-13 | Pipeline fluid temperature sensor based on fiber bragg grating |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110926723A (en) * | 2019-11-06 | 2020-03-27 | 江苏法尔胜光电科技有限公司 | Fiber grating heat sensing probe based on acid corrosion heat release |
| CN112697302A (en) * | 2020-12-05 | 2021-04-23 | 重庆大学 | Total temperature probe based on fiber bragg grating and manufacturing method thereof |
| CN114018303A (en) * | 2021-11-04 | 2022-02-08 | 天津工业大学 | Novel fiber Bragg grating probe for in-situ monitoring of hydraulic shear force |
| CN114112104A (en) * | 2021-11-17 | 2022-03-01 | 绍兴市上虞区武汉理工大学高等研究院 | Optical fiber temperature sensor packaging method and pressure resistance testing method for high-pressure runner |
| WO2022121000A1 (en) * | 2020-12-10 | 2022-06-16 | 深圳大学 | Hermetic-type encapsulation structure for fiber-optic sensor, encapsulation apparatus, and encapsulation method |
| CN114935115A (en) * | 2022-06-20 | 2022-08-23 | 武汉理工大学 | Integrated temperature measurement structure for fluid pipeline and packaging method |
| WO2023118859A1 (en) * | 2021-12-23 | 2023-06-29 | Oxsensis Ltd. | Optical sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110926723A (en) * | 2019-11-06 | 2020-03-27 | 江苏法尔胜光电科技有限公司 | Fiber grating heat sensing probe based on acid corrosion heat release |
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| CN114112104A (en) * | 2021-11-17 | 2022-03-01 | 绍兴市上虞区武汉理工大学高等研究院 | Optical fiber temperature sensor packaging method and pressure resistance testing method for high-pressure runner |
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| CN114935115A (en) * | 2022-06-20 | 2022-08-23 | 武汉理工大学 | Integrated temperature measurement structure for fluid pipeline and packaging method |
| CN114935115B (en) * | 2022-06-20 | 2023-01-03 | 武汉理工大学 | Integrated temperature measurement structure for fluid pipeline and packaging method |
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