CN114323093A - Gluing protection method for optical fiber sensor with quartz tube structure - Google Patents
Gluing protection method for optical fiber sensor with quartz tube structure Download PDFInfo
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- CN114323093A CN114323093A CN202111521712.4A CN202111521712A CN114323093A CN 114323093 A CN114323093 A CN 114323093A CN 202111521712 A CN202111521712 A CN 202111521712A CN 114323093 A CN114323093 A CN 114323093A
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- optical fiber
- quartz tube
- sensor
- fiber sensor
- tube structure
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 91
- 239000010453 quartz Substances 0.000 title claims abstract description 76
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004026 adhesive bonding Methods 0.000 title description 3
- 239000002390 adhesive tape Substances 0.000 claims abstract description 52
- 239000003292 glue Substances 0.000 claims abstract description 28
- 239000000853 adhesive Substances 0.000 claims abstract description 22
- 230000001070 adhesive effect Effects 0.000 claims abstract description 22
- 238000009434 installation Methods 0.000 claims abstract description 22
- 230000001681 protective effect Effects 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims description 13
- 239000010410 layer Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 4
- 239000012790 adhesive layer Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 14
- 239000002775 capsule Substances 0.000 abstract 6
- 239000000835 fiber Substances 0.000 abstract 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 15
- 238000005259 measurement Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Abstract
The invention discloses an adhesive protection method of an optical fiber sensor with a quartz tube structure, and belongs to the field of sensor testing. According to the invention, the adhesive tape is arranged at the first end part of the quartz tube of the optical fiber sensor with the quartz tube structure, so that the optical fiber at the first end part of the quartz tube is protected from shear stress applied to a step formed at the first end part of the quartz tube in the curing process of high-temperature adhesive; install the visor at quartz capsule structure optical fiber sensor quartz capsule second tip, be close to the position of optic fibre protective sheath promptly, and it is fixed with the sticky tape, protect the optic fibre of quartz capsule second tip department, do not receive the shear stress that the step department that forms in quartz capsule second tip department in the high temperature glue curing process applyed, avoid the mobility because the installation glue, cause the adhesion of protective case and optic fibre, reduce the atress of optic fibre, avoid causing the damage of light signal, realize the low-loss installation of light signal of the optical fiber sensor of quartz capsule structure at the structure that awaits measuring, improve the degree of accuracy of quartz capsule structure optical fiber sensor measuring result.
Description
Technical Field
The invention relates to an adhesive protection method for an optical fiber sensor with a quartz tube structure, and belongs to the field of sensor testing.
Background
For a contact type measuring optical fiber sensor, an installation method is a key technology in sensor application, particularly, parameter measurement of a piece to be tested is measured in a high-temperature environment, and the performance and the measurement accuracy of the sensor are directly influenced by the low loss factor and the high-temperature stability of the installation method of the sensor.
Common methods for mounting are gluing and welding. The welding installation method is used for welding and fixing the sensor and the structure to be measured, the requirement on the material of the sensor and the structure to be measured is high, a contact surface with a certain area is required to be arranged between the sensor and the structure to be measured to serve as a welding point to guarantee the installation reliability, and the method is not suitable for the optical fiber sensor. For the optical fiber sensor, the adhesive mounting method is a mounting method which is convenient, small in destructiveness and high in adaptability.
When the optical fiber sensor is used for contact type measurement under high temperature conditions, the typical optical fiber sensor structure is a quartz tube structure optical fiber sensor. When the optical fiber sensor with the quartz tube structure is installed by using high-temperature glue, the physical and chemical properties of the material of the structural part to be tested and the high-temperature glue are greatly different, and the installation layer is easy to fall off. However, the surface of the structure to be measured is protruded by the processing method, and the wall thickness of the quartz tube structure of the optical fiber sensor is added, so that a step with a height difference is formed on the surface of the optical fiber and the structure to be measured, the step is easy to generate shearing force, the optical fiber is damaged, optical signals of the sensor are influenced, and the performance and the measurement accuracy of the sensor are reduced.
The high temperature resistant installation of the optical fiber sensor with the quartz tube structure needs to solve the following problems:
before the high-temperature glue is applied to the optical fiber sensor with the quartz tube structure, a proper pre-fixing method is needed to protect the optical fiber at the end part of the quartz tube, the optical fiber is located at a step position, if the high-temperature glue is applied to the optical fiber, the high-temperature glue curing process can apply shearing force to the optical fiber, damage is caused to the optical fiber, and the optical signal of the sensor is influenced.
The transmission link of the optical fiber sensor with the quartz tube structure can be additionally provided with the sleeve protecting optical fiber, the step problem is caused due to the thickness of the sleeve, and when the high-temperature glue is installed, the adhesion of the protecting sleeve and the optical fiber is avoided due to the flowability of the high-temperature glue, the stress of the optical fiber is reduced, and the damage of an optical signal is avoided.
Disclosure of Invention
The optical fiber sensor with the quartz tube structure aims to solve the problems that optical signals of the sensor are easily damaged and the optical signal transmission of the sensor is easily influenced in an adhesive installation mode, so that the sensor measuring result is inaccurate due to the damage of the optical signals when the optical fiber sensor with the quartz tube structure is used for measuring. The invention mainly aims to provide an adhesive protection method for an optical fiber sensor with a quartz tube structure.
The purpose of the invention is realized by the following technical scheme.
The invention discloses an adhesive protection method of a quartz tube structure optical fiber sensor, which comprises the following steps:
the method comprises the following steps that firstly, a sensor is pre-fixed at a position to be measured through an adhesive tape, the adhesive tape is placed at a first end part of a quartz tube of the quartz tube structure optical fiber sensor to protect an optical fiber at the first end part of the quartz tube from shear stress applied to a step formed at the first end part of the quartz tube in a high-temperature adhesive curing process, and meanwhile, the quartz tube structure optical fiber sensor is pre-fixed at an installation position;
step two, fixing the protective cover; and installing the protective cover at the second end part of the quartz tube structure optical fiber sensor, namely, at a position close to the optical fiber protective sleeve, and fixing the protective cover by using an adhesive tape. The optical fiber at the second end of the quartz tube is protected from shear stress applied to a step formed at the second end of the quartz tube in the curing process of the high-temperature glue, the adhesion of the optical fiber protection sleeve and the optical fiber due to the fluidity of the mounting glue is avoided, the stress of the optical fiber is reduced, and the damage of an optical signal is avoided;
step three, manufacturing a glue groove; enclosing the installation area of the optical fiber sensor with the quartz tube structure by using an adhesive tape; coating the area with glue, covering the second adhesive tape in the coating process, and ensuring that the thickness of the glue layer is larger than the outer diameter of the quartz tube;
step four: and (4) curing the high-temperature adhesive, namely curing according to the curing conditions of the high-temperature adhesive, removing the adhesive tapes except the second adhesive tape after curing, and removing the protective cover to finish the installation of the sensor.
The protective cover is of an L-shaped structure with an arch-shaped bulge, and the inner diameter of the arch-shaped bulge is matched with that of the quartz tube.
Preferably, 2-3 layers of adhesive tapes are attached to ensure that the thickness of the adhesive layer is larger than the outer diameter of the quartz tube.
Has the advantages that:
1. according to the adhesion protection method for the optical fiber sensor with the quartz tube structure, disclosed by the invention, the optical fiber at the step position is protected by adopting the adhesive tape, and the optical fiber protection tube are prevented from being adhered by adopting the high-temperature adhesive through the protective cover, so that the optical signal of the optical fiber sensor is prevented from being influenced, and the accuracy of the measurement result of the optical fiber sensor with the quartz tube structure is improved.
2. The invention discloses an adhesive protection method of a quartz tube structure optical fiber sensor. The optical fiber at the second end of the quartz tube is protected from shear stress applied to a step formed at the second end of the quartz tube in the high-temperature glue curing process, adhesion of the protection sleeve and the optical fiber due to the flowability of mounting glue is avoided, stress of the optical fiber is reduced, damage of an optical signal is avoided, the optical fiber sensor of the quartz tube structure is mounted at the low loss of the optical signal of a structural member to be measured, and the problem that the measurement error is large due to mounting is avoided.
Drawings
FIG. 1 is a flow chart of the adhesive protection of an optical fiber sensor with a quartz tube structure according to the present invention;
FIG. 2 is a schematic view of an optical fiber sensor with a quartz tube structure according to the present invention;
FIG. 3 is a protective cover used during the sensor mounting process of the present invention;
FIG. 4 illustrates a first high temperature resistant adhesive tape and a protective cover according to the present invention;
FIG. 5 illustrates a second high temperature resistant adhesive tape and a third high temperature resistant adhesive tape adhered to the substrate of the invention;
FIG. 6 shows a fourth high temperature resistant adhesive tape, a fifth high temperature resistant adhesive tape, and a sixth high temperature resistant adhesive tape adhered to the present invention;
FIG. 7 is a high temperature mounting paste of the present invention;
FIG. 8 shows the spectral signal change before and after the sensor of the present invention is installed.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Example 1: a quartz tube structure optical fiber FP strain sensor is arranged on the surface of a GH4169 test beam, the GH4169 test beam is arranged on a high-temperature strain calibration device for strain loading, the performance index of the sensor is tested, and the structure of the quartz tube structure optical fiber FP strain sensor is shown in figure 2.
As shown in fig. 1, the method for protecting an optical fiber sensor with a quartz tube structure disclosed in this embodiment includes the following specific steps:
1) pretreatment: determining an installation position on a GH4169 test piece which is subjected to sand blasting and metal bottom layer increasing, wherein the used adhesive tape is a high-temperature-resistant adhesive tape, and the cut high-temperature-resistant adhesive tapes are a first high-temperature-resistant adhesive tape (10mm multiplied by 30mm), a second paper high-temperature-resistant adhesive tape (1mm multiplied by 2mm), a third high-temperature-resistant adhesive tape (1mm multiplied by 5mm), a fourth high-temperature-resistant adhesive tape (1mm multiplied by 5mm), a fifth high-temperature-resistant adhesive tape (1mm multiplied by 20mm) and a sixth high-temperature-resistant adhesive tape (1mm multiplied by 20 mm);
2) pre-fixing: placing the optical fiber FP strain sensor with the quartz tube structure at the position in the first step, as shown in fig. 4, adhering a first paper high-temperature-resistant adhesive tape to an optical fiber protection sleeve of the optical fiber FP strain sensor with the quartz tube structure, fixing a transmission optical fiber, and placing a protective cover as shown in fig. 3 at the joint of the second end part of the quartz tube of the optical fiber FP strain sensor with the quartz tube structure and the transmission optical fiber protection sleeve, wherein the inner diameter of the protective cover can be 380 μm and is matched with the outer diameter of the quartz tube which is 350 μm. As shown in fig. 5, a second high temperature resistant adhesive tape is adhered to the first end of the quartz tube, a third high temperature resistant adhesive tape is adhered to the protective cover, and the third high temperature resistant adhesive tape is aligned with the boundary of the protective cover to fix the protective cover;
3) manufacturing an installation glue groove: as shown in fig. 6, a fourth high temperature resistant adhesive tape is adhered to the front 2mm of the second end of the quartz tube structure optical fiber FP strain sensor, a fifth high temperature resistant adhesive tape is adhered to two sides of the optical fiber sensor and is 1.5mm away from the quartz tube structure optical fiber FP strain sensor, a third high temperature resistant adhesive tape, a fourth high temperature resistant adhesive tape and a fifth high temperature resistant adhesive tape form a rectangular mounting adhesive groove, and the third high temperature resistant adhesive tape, the fourth high temperature resistant adhesive tape, the fifth high temperature resistant adhesive tape and the sixth high temperature resistant adhesive tape are adhered to two layers to ensure the thickness of the adhesive layers;
4) and (3) high-temperature glue installation: as shown in fig. 7, uniformly spreading the uniformly mixed high-temperature glue (high-temperature ceramic glue) on the rectangular mounting glue groove, and covering the second high-temperature resistant adhesive tape with the high-temperature glue;
5) high-temperature glue high-temperature curing and cooling: placing the GH4169 test piece without the high-temperature-resistant adhesive tape in a high-temperature furnace, wherein the curing conditions are as follows: the temperature of the GH4169 test piece is naturally reduced to room temperature after the GH4169 test piece is solidified at the high temperature of 170 ℃, 30min and 360 ℃ for 30min, the GH4169 test piece is taken out, the third high temperature resistant adhesive tape, the fourth high temperature resistant adhesive tape, the fifth high temperature resistant adhesive tape and the sixth high temperature resistant adhesive tape are gently taken down, the protective cover is taken down, and the sensor is completely installed;
6) and (3) detection: detecting spectral signals of an optical fiber FP strain sensor with a quartz tube structure after installation, wherein optical signals before and after installation of the sensor are shown in FIG. 8, and the optical signals before and after installation of the sensor are not changed;
7) mounting GH4169 test beam: installing a GH4169 test beam of the optical fiber FP strain sensor with the quartz tube structure on a high-temperature strain calibration device based on a rigid frame beam structure;
8) temperature strain combined loading: heating the high-temperature strain calibration device to 650 ℃, loading +/-1000 mu epsilon, performing positive and negative strokes for 3 times, and performing a strain loading test to test the performance index of the sensor;
the measured data were analyzed:
the performance test of the installed optical fiber FP strain sensor is carried out on a strain calibration device of a rigid frame beam structure, the cavity length change of the optical fiber FP strain sensor is shown in table 1, and according to the cavity length change of the optical fiber FP strain sensor, the performance indexes of the optical fiber FP strain sensor at 650 ℃ are shown in table 2:
TABLE 1 optical fiber FP Strain sensor Strain Loading Cavity Length variation
TABLE 2 Performance index of optical fiber FP strain sensor at 650 deg.C
| Nonlinearity (%) | Repeatability (%) | Retardation (%) | Precision (%) | Sensitivity (μm/. mu.ε) |
| 0.194 | 0.0667 | 0.449 | 0.493 | 25.13 |
The adhesive protection method for the optical fiber sensor with the quartz tube structure can realize low-loss installation of the optical fiber sensor with the quartz tube structure, and avoids damage to the sensor in the installation process from influencing the performance index or test result of the sensor.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. An adhesive protection method for an optical fiber sensor with a quartz tube structure is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the method comprises the following steps that firstly, a sensor is pre-fixed at a position to be measured through an adhesive tape, the adhesive tape is placed at a first end part of a quartz tube of the quartz tube structure optical fiber sensor to protect an optical fiber at the first end part of the quartz tube from shear stress applied to a step formed at the first end part of the quartz tube in a high-temperature adhesive curing process, and meanwhile, the quartz tube structure optical fiber sensor is pre-fixed at an installation position;
step two, fixing the protective cover; the protective cover is arranged at the second end part of the quartz tube structure optical fiber sensor, namely the position close to the light ray protective sleeve, and is fixed by an adhesive tape; the optical fiber at the second end of the quartz tube is protected from shear stress applied to a step formed at the second end of the quartz tube in the curing process of the high-temperature glue, the adhesion of the optical fiber protection sleeve and the optical fiber due to the fluidity of the mounting glue is avoided, the stress of the optical fiber is reduced, and the damage of an optical signal is avoided;
step three, manufacturing a glue groove; enclosing the installation area of the optical fiber sensor with the quartz tube structure by using an adhesive tape; coating the area with glue, covering the second adhesive tape in the coating process, and ensuring that the thickness of the glue layer is larger than the outer diameter of the quartz tube;
step four: and (3) curing the high-temperature adhesive, namely curing according to the curing conditions of the high-temperature adhesive, removing the adhesive tapes except the second adhesive tape after curing, removing the protective cover, and finishing the installation of the sensor, namely realizing the adhesive protection of the optical fiber sensor with the quartz tube structure.
2. The method for adhesive protection of an optical fiber sensor with a quartz tube structure according to claim 1, wherein: the protective cover is of an L-shaped structure with an arch-shaped bulge, and the inner diameter of the arch-shaped bulge is matched with that of the quartz tube.
3. The method for adhesive protection of an optical fiber sensor with a quartz tube structure according to claim 1 or 2, wherein: the adhesive tape can be adhered with 2-3 layers, so that the thickness of the adhesive layer is larger than the outer diameter of the quartz tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111521712.4A CN114323093B (en) | 2021-12-13 | 2021-12-13 | Adhesive protection method for quartz tube structure optical fiber sensor |
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| CN202111521712.4A CN114323093B (en) | 2021-12-13 | 2021-12-13 | Adhesive protection method for quartz tube structure optical fiber sensor |
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| CN114323093B CN114323093B (en) | 2023-11-03 |
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2021
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