CN112595255A - High-durability fiber grating strain sensor and packaging method thereof - Google Patents
High-durability fiber grating strain sensor and packaging method thereof Download PDFInfo
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- CN112595255A CN112595255A CN202011608187.5A CN202011608187A CN112595255A CN 112595255 A CN112595255 A CN 112595255A CN 202011608187 A CN202011608187 A CN 202011608187A CN 112595255 A CN112595255 A CN 112595255A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a high-durability fiber grating strain sensor and a packaging method thereof. The sensor comprises two cylindrical optical fiber winding devices, a fixed bottom plate, an optical fiber grating and an optical fiber; the two optical fiber winding devices are fixed on the fixed bottom plate, two ends of the optical fiber are respectively and correspondingly wound on the two cylindrical optical fiber winding devices, a space is formed between the two cylindrical optical fiber winding devices, and the length of the space at least can enable the optical fiber between the two cylindrical optical fiber winding devices to integrate the optical fiber grating; the optical fiber between the two cylindrical optical fiber winding devices keeps constant pre-tension and forms a sensing section optical fiber together with the fiber bragg grating; the optical fiber is fixed to the cylindrical optical fiber winding device by an adhesive. The strain transmission of the sensor only comprises a fixed bottom plate, a cylindrical optical fiber winding device, a sensing section optical fiber and a small amount of adhesive for maintaining pretension, and the sensor is simple in structure and high in durability.
Description
Technical Field
The invention belongs to the field of civil engineering structure health monitoring, and particularly relates to a high-durability fiber grating strain sensor and a packaging method thereof.
Background
In the field of civil engineering, measuring the strain of a structural member is of great significance for understanding the safety performance of the structure and the service state of the structure. Therefore, obtaining strain information of a structure under load is one of the conventional contents of the structure health monitoring work. For the whole structure, the structural response parameters under the action of dynamic load are concerned, so the structure needs to be monitored in real time, and structural response, modal parameters and the like are obtained and analyzed, and the parameters reflecting the static and dynamic characteristics of the structure mainly comprise strain, acceleration and displacement. For structural members, it is often necessary to know the stress response of the structural member in the working state, and a basis is provided for subsequent performance analysis of the evaluation member, and for such problems, the analysis is often performed through strain.
Fiber grating strain sensors are new types of sensors that have developed rapidly in the last decade and are being rapidly deployed. However, due to the small diameter of the optical fiber, the optical fiber grating needs to be packaged and protected in specific applications. The general method is to stick the fiber grating on some kind of elastic body, and then fix them together on the surface of the structure to be measured. The strain on the surface of the structure needs to be transferred to the surface of the fiber grating through the bonding layer of the elastomer and the adhesive, so that the strain of the fiber grating is changed. However, the durability of the adhesive will directly affect the efficiency of the structural strain transfer to the fiber grating over the long term operation of the structure. Once the adhesive fails, the transmission relationship of the strain of the structure to the strain of the fiber grating changes, thereby affecting the strain measurement accuracy of the sensor.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a high-durability fiber grating strain sensor and a packaging method thereof, which can effectively improve the durability and the measurement precision of the sensor.
The specific technical scheme of the invention is as follows:
a high durability fiber grating strain sensor comprising: the device comprises two cylindrical optical fiber winding devices, a fixed bottom plate, an optical fiber grating and an optical fiber; the two cylindrical optical fiber winding devices are fixed on the fixed bottom plate, two ends of the optical fiber are respectively and correspondingly wound on the two cylindrical optical fiber winding devices, a gap is formed between the two cylindrical optical fiber winding devices, and the length of the gap at least can enable the optical fiber between the two cylindrical optical fiber winding devices to integrate the fiber bragg grating; the optical fiber between the two cylindrical optical fiber winding devices keeps constant pre-tension and forms a sensing section optical fiber with the fiber bragg grating 3; the optical fiber wound on the cylindrical optical fiber winding device is fixed on the cylindrical optical fiber winding device through an adhesive.
Preferably, the pre-tensioning force causes a strain level of 1500 μ ∈ for the fiber grating.
Preferably, each of the optical fibers is wound on the corresponding cylindrical optical fiber winding device (1) for more than 5 turns. By winding the optical fiber around the cylindrical optical fiber winding device a plurality of times, the pretension of the optical fiber is gradually reduced along with the increase of the number of winding turns, so that the constant pretension of the optical fiber at the sensing section can be maintained with a small adhesive force or friction force by applying the adhesive.
Preferably, the diameter of the cylindrical fiber winding device is larger than 2cm in order to reduce the problem of light loss caused by the winding of the optical fiber.
Preferably, the optical fiber is an antiflex fiber to further reduce the problem of optical loss of the optical fiber.
The invention also provides a packaging method of the high-durability fiber grating strain sensor, which comprises the following steps:
step one, fixing two cylindrical optical fiber winding devices on a fixed bottom plate according to the requirement of sensing gauge length;
winding the loose optical fiber on a cylindrical optical fiber winding device for more than 5 circles, and then adhering and fixing the optical fiber and the cylinder by using an adhesive;
winding the other end of the optical fiber on another cylindrical optical fiber winding device under the condition of keeping a certain pre-tension for more than 5 circles;
step four, under the condition of maintaining the pretension of the optical fiber between the two cylindrical optical fiber winding devices, the optical fiber is stuck and fixed with the other cylindrical optical fiber winding device by using an adhesive; and after the adhesive is cured, relaxing the pretension of the free end of the optical fiber.
By using the sensor packaging method in the technical scheme of the invention, the strain transmission of the sensor is only realized by the fixing bottom plate, the cylindrical optical fiber winding device, the sensing section optical fiber and a small amount of adhesive for maintaining the pretension, and the sensor packaging method has the advantages of simple structure and high durability.
By using the sensor in the technical scheme of the invention, the optical fiber is adhered and fixed by the adhesive, the adhesive only plays a role in fixing the optical fiber and does not play a role in transferring strain by the adhesive layer, and the adhesive only needs to ensure that the adhesive force can maintain the level of the pretension of the optical fiber in the aging process and does not participate in the strain transfer process; even if the adhesive is aged, as long as the adhesive can maintain the fixation of the optical fiber, the durability of the sensor can be greatly improved.
Drawings
FIG. 1 is a schematic diagram of a packaging method according to the present invention.
In the figure: 1-cylindrical optical fiber winding device; 2, fixing the bottom plate; 3-fiber grating; 4-optical fiber.
Detailed Description
In order to clearly express the operation steps, purposes and advantages of the invention, the technical scheme of the invention is clearly and completely described below by combining with the schematic drawings in the embodiment of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, in an embodiment of the present invention, a high-durability fiber grating strain sensor 100 includes two cylindrical fiber winding devices 1, a fixed base plate 2, a fiber grating 3, and an optical fiber 4; the two cylindrical optical fiber winding devices 1 are fixed on the fixed base plate 2, two ends of the optical fiber 4 are respectively and correspondingly wound on the two cylindrical optical fiber winding devices 1, a gap is formed between the two cylindrical optical fiber winding devices 1, and the length of the gap can at least enable the optical fiber 4 positioned between the two cylindrical optical fiber winding devices 1 to be integrated with the optical fiber grating 3; the optical fiber 4 positioned between the two cylindrical optical fiber winding devices 1 keeps constant pre-tension and forms a sensing section optical fiber with the optical fiber grating 3; the optical fiber 4 wound around the cylindrical optical fiber winding device 1 is fixed to the cylindrical optical fiber winding device 1 by an adhesive.
In an embodiment of the present invention, a method for packaging the fiber grating strain sensor 100 with high durability includes the following steps:
1. firstly, fixing two cylindrical optical fiber winding devices 1 on a fixed bottom plate 1 according to the specific sensing gauge length requirement of a sensor 100; in view of the problem of light loss caused by the winding of the optical fiber 4, the diameter of the cylindrical optical fiber winding device 1 is preferably larger than 2 cm; the diameter of the cylindrical optical fiber winding device 1 is determined according to actual needs, and meanwhile, the anti-bending optical fiber 4 and the optical fiber grating 3 integrated on the anti-bending optical fiber are taken as sensing section optical fibers;
2. firstly, winding the loose optical fiber 4 on a cylindrical optical fiber winding device for more than 5 circles, and then adhering and fixing the optical fiber 4 and the cylindrical optical fiber winding device 1 by using an adhesive;
3. then, the other end of the optical fiber 4 is wound around another cylindrical optical fiber winding device 1 for 5 turns or more while maintaining a predetermined pre-tension, and then the optical fiber 4 and the cylindrical optical fiber winding device 1 are fixed by an adhesive while maintaining the pre-tension, and after the adhesive is cured, the pre-tension of the free end is relaxed.
The level of the pretension of the sensing section optical fiber is determined according to the actual monitoring requirement, and the pretension of the strain level of about 1500 mu epsilon of the optical fiber grating is generally caused.
Thus, on the fixed bottom plate 2, the sensing section optical fiber which is kept with certain pre-tension between the two cylindrical optical fiber winding devices 1 has the capability of strain monitoring, and the sensing section optical fiber consists of an optical fiber 4 and an optical fiber grating 3 integrated in the optical fiber, so that the core part of the packaging method is formed; and taking the remaining packaging protection measures of the sensor 100 according to the specific engineering application.
In the field of structural health monitoring, structural strain is an important monitoring index, and strain energy can reflect the state of structural members including materials and the like, so that the safety state of the structure under the action of loads (including disasters such as earthquake, typhoon and the like) can be conveniently analyzed. Based on the fiber bragg grating strain sensing principle, the invention reduces the internal pretension of the optical fiber 4 circle by using the cylindrical optical fiber winding device 1, so that the adhesive can be adhered under the condition of small pretension of the optical fiber 4, and the durability of the sensor 100 is improved. The packaging method of the sensor 100 is characterized in that the sensor 100 has high durability and has wide application prospect.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A high durability fiber grating strain sensor, comprising: the device comprises two cylindrical optical fiber winding devices (1), a fixed bottom plate (2), an optical fiber grating (3) and an optical fiber (4);
the two cylindrical optical fiber winding devices (1) are fixed on the fixed base plate (2), two ends of the optical fiber (4) are respectively and correspondingly wound on the two cylindrical optical fiber winding devices (1), a distance is formed between the two cylindrical optical fiber winding devices (1), and the length of the distance at least can enable the optical fiber (4) between the two cylindrical optical fiber winding devices (1) to be integrated with the optical fiber grating (3);
the optical fiber (4) positioned between the two cylindrical optical fiber winding devices (1) keeps constant pre-tension and forms a sensing section optical fiber together with the optical fiber grating (3);
the optical fiber (4) wound on the cylindrical optical fiber winding device (1) is fixed on the cylindrical optical fiber winding device (1) through an adhesive.
2. The high durability fiber grating strain sensor of claim 1, wherein: the pre-tensioning force causes a strain level of 1500 mu epsilon of the fiber grating (3).
3. The high durability fiber grating strain sensor of claim 1, wherein: and each optical fiber (4) is wound on the corresponding cylindrical optical fiber winding device (1) for more than 5 circles.
4. The high durability fiber grating strain sensor of claim 1, wherein: the diameter of the cylindrical optical fiber winding device (1) is larger than 2 cm.
5. The high durability fiber grating strain sensor of claim 1, wherein: the optical fiber (4) is an antiflex fiber.
6. The packaging method of the high-durability fiber grating strain sensor as claimed in any one of claims 1 to 5, characterized by comprising the following steps:
firstly, fixing two cylindrical optical fiber winding devices (1) on a fixed bottom plate (2) according to the requirement of sensing gauge length;
winding the loose optical fiber (4) on a cylindrical optical fiber winding device for more than 5 circles, and then adhering and fixing the optical fiber (4) and the cylinder by using an adhesive;
winding the other end of the optical fiber (4) on another cylindrical optical fiber winding device (1) under the condition of keeping a certain pre-tension for more than 5 circles;
step four, adhering and fixing the optical fiber (4) and the other cylindrical optical fiber winding device (1) by using an adhesive under the condition of maintaining the pre-tension of the optical fiber (4) between the two cylindrical optical fiber winding devices (1); and after the adhesive is cured, the pretension of the free end of the optical fiber (4) is relaxed.
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| CN202011608187.5A CN112595255A (en) | 2020-12-30 | 2020-12-30 | High-durability fiber grating strain sensor and packaging method thereof |
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| CN202011608187.5A CN112595255A (en) | 2020-12-30 | 2020-12-30 | High-durability fiber grating strain sensor and packaging method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114923430A (en) * | 2022-04-19 | 2022-08-19 | 大连理工大学 | Non-glue fiber grating strain sensor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6448551B1 (en) * | 1999-11-29 | 2002-09-10 | Weatherford/Lamb, Inc. | Fiber Bragg grating sensor system having enhanced strain-to-wavelength responsivity by using a spectral beating based vernier effect |
| CN2706739Y (en) * | 2004-05-10 | 2005-06-29 | 欧进萍 | Pre-stretching optical fiber raster big-scalar range strain sensor |
| CN102425994A (en) * | 2011-08-20 | 2012-04-25 | 大连理工大学 | Fiber grating soil mass strain sensor of soil mass encapsulation |
| CN103335605A (en) * | 2013-07-08 | 2013-10-02 | 大连理工大学 | High-durability binder-free packaging optical fiber grating strain sensor and packaging method |
| CN203310382U (en) * | 2013-07-08 | 2013-11-27 | 大连理工大学 | Concrete freeze-thaw expansion strain monitoring fiber sensor |
-
2020
- 2020-12-30 CN CN202011608187.5A patent/CN112595255A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6448551B1 (en) * | 1999-11-29 | 2002-09-10 | Weatherford/Lamb, Inc. | Fiber Bragg grating sensor system having enhanced strain-to-wavelength responsivity by using a spectral beating based vernier effect |
| CN2706739Y (en) * | 2004-05-10 | 2005-06-29 | 欧进萍 | Pre-stretching optical fiber raster big-scalar range strain sensor |
| CN102425994A (en) * | 2011-08-20 | 2012-04-25 | 大连理工大学 | Fiber grating soil mass strain sensor of soil mass encapsulation |
| CN103335605A (en) * | 2013-07-08 | 2013-10-02 | 大连理工大学 | High-durability binder-free packaging optical fiber grating strain sensor and packaging method |
| CN203310382U (en) * | 2013-07-08 | 2013-11-27 | 大连理工大学 | Concrete freeze-thaw expansion strain monitoring fiber sensor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114923430A (en) * | 2022-04-19 | 2022-08-19 | 大连理工大学 | Non-glue fiber grating strain sensor |
| CN114923430B (en) * | 2022-04-19 | 2023-05-26 | 大连理工大学 | Non-gel fiber grating strain sensor |
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