Fiber grating sensor packaging structure

Abstract

The utility model provides a fiber bragg grating sensor packaging structure, which comprises an optical fiber, two mounting bases, a carbon composite packaging plate and a carbon composite protection tube, the two mounting bases are respectively positioned at two opposite ends of the carbon composite packaging plate and are fixedly connected with the carbon composite packaging plate, and the carbon composite protection tube is fixedly connected with the carbon composite packaging plate. The carbon composite protection tube is sleeved on the optical fiber, is positioned between the carbon composite packaging plate and the mounting base, and is tightly pressed on the mounting base by the carbon composite packaging plate. According to the utility model, the technical problems that normal measurement is influenced and the service life is shortened due to corrosion, cracks and strength weakening when the existing fiber grating sensor is applied in a humid environment are solved, and the technical effects of improving the strength of the fiber grating sensor and prolonging the service life of the fiber grating sensor in the humid environment are achieved.

Description

Technical Field

[0001] This utility model relates to the field of fiber Bragg grating sensor technology, and in particular to a fiber Bragg grating sensor packaging structure. Background Technology

[0002] Fiber Bragg grating (FBG) sensors are sensors based on fiber optic transmission and grating technology. They measure optical signals in optical fibers by utilizing the characteristics of gratings, thereby enabling the measurement and detection of physical quantities. They are characterized by high precision, long lifespan, and strong anti-interference capabilities.

[0003] Because fiber Bragg grating sensors are essentially glass fibers with gratings etched on them, which are small in diameter and brittle, they are easily damaged by external forces during normal detection operations, leading to breakage and inactivation. Therefore, they must be encapsulated for protection. Currently, fiber Bragg grating sensors are mostly encapsulated using metal or plastic materials. The encapsulation process is complex and costly, and in humid environments, they are prone to corrosion, cracking, and weakening, affecting normal measurement and shortening their lifespan, making long-term use impossible. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a fiber Bragg grating sensor packaging structure, which solves the problems of corrosion, cracking, weakened strength, and shortened service life of existing fiber Bragg grating sensors when used in humid environments.

[0005] According to an embodiment of the present invention, a fiber optic grating sensor packaging structure includes an optical fiber, a mounting base, a carbon composite packaging plate, and a carbon composite protective tube. Two mounting bases are located at opposite ends of the carbon composite packaging plate and are fixedly connected to it. The carbon composite protective tube is sleeved on the optical fiber and is located between the carbon composite packaging plate and the mounting base, with the carbon composite packaging plate pressing the carbon composite protective tube firmly onto the mounting base.

[0006] Furthermore, the optical fiber includes a core, on which a cladding layer and a coating layer are sequentially wrapped from the inside out.

[0007] Furthermore, the carbon composite protective tube encapsulates the coating layer and is formed into an integral structure with the optical fiber.

[0008] Furthermore, sensing units are etched on the optical fiber, and the number of sensing units is at least one.

[0009] Furthermore, the optical fiber is any one of quartz optical fiber, sapphire optical fiber, YAG crystal optical fiber, and photonic crystal optical fiber.

[0010] Furthermore, the carbon composite encapsulation plate is provided with a mounting groove, and the carbon composite protective tube fits into the mounting groove.

[0011] Furthermore, an adhesive layer is provided between the carbon composite encapsulation board and the carbon composite protective tube, and the adhesive layer bonds the carbon composite encapsulation board and the carbon composite protective tube into an integrated structure.

[0012] Furthermore, the carbon composite encapsulation plate and the carbon composite protective tube are either die-cast integral structures or braided integral structures.

[0013] Furthermore, the mounting base is provided with threaded holes and mounting bolts that mate with the threaded holes, and the carbon composite encapsulation plate is provided with through holes aligned with the threaded holes.

[0014] Furthermore, fiber optic connectors are provided at both ends of the optical fiber.

[0015] Compared with existing technologies, this utility model has the following beneficial effects: By using a carbon composite encapsulation plate and a carbon composite protective tube made of carbon composite material to encapsulate the fiber optic grating sensor, wherein the carbon composite protective tube is sleeved outside the optical fiber and clamped by the fixed connection between the carbon composite encapsulation plate and the mounting base, the optical fiber is encapsulated by the carbon composite encapsulation plate and the carbon composite protective tube. By setting up a mounting base for the fiber optic grating sensor to be installed, it solves the technical problems of existing fiber optic grating sensors that rust, crack, weaken in strength, affect normal measurement and shorten service life when used in humid environments. It produces the technical effect of improving the strength of the fiber optic grating sensor and extending its service life in humid environments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fiber Bragg grating sensor packaging structure according to an embodiment of the present invention;

[0017] Figure 2 This is a partial structural schematic diagram of a fiber Bragg grating sensor packaging structure according to an embodiment of the present invention;

[0018] Figure 3 This is a partial cross-sectional view of a fiber Bragg grating sensor packaging structure according to an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the optical fiber structure in the fiber optic grating sensor packaging structure according to an embodiment of the present invention.

[0020] In the above figures: 1. Optical fiber; 101. Fiber core; 102. Cladding; 103. Coating layer; 104. Sensing unit; 2. Carbon composite protective tube; 3. Carbon composite encapsulation plate; 301. Mounting groove; 4. Mounting base; 5. Fiber optic connector. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figures 1 to 4 As shown in the figure, this utility model embodiment proposes a fiber Bragg grating sensor packaging structure for packaging and protecting a fiber Bragg grating sensor.

[0023] Please refer to Figure 1 , Figure 2 and Figure 3 The fiber optic grating sensor encapsulation structure includes an optical fiber 1, a mounting base 4, a carbon composite encapsulation plate 3, and a carbon composite protective tube 2. There are two mounting bases 4, located at opposite ends of the carbon composite encapsulation plate 3 and fixedly connected to it. The carbon composite protective tube 2 is sleeved on the optical fiber 1, positioned between the carbon composite encapsulation plate 3 and the mounting base 4. The carbon composite encapsulation plate 3 presses the carbon composite protective tube 2 against the mounting base 4, clamping and fixing the carbon composite protective tube 2 and the optical fiber 1 within it between the carbon composite encapsulation plate 3 and the mounting base 4, thus forming an encapsulation structure to protect the optical fiber 1. The fiber optic grating sensor can be installed by mounting the mounting base 4 to the working position.

[0024] The fiber optic grating sensor encapsulation structure provided in this embodiment encapsulates the optical fiber 1 using a carbon composite encapsulation plate 3 and a carbon composite protective tube 2 made of carbon composite material. After the optical fiber 1 is inserted into the tubular carbon composite protective tube 2, the carbon composite protective tube 2 is placed between the carbon composite encapsulation plate 3 and the mounting base 4, and the mounting base 4 is fixedly connected to the carbon composite encapsulation plate 3 to complete the encapsulation of the optical fiber 1. The mounting base 4 is provided for the installation of the fiber optic grating sensor. When the fiber optic grating sensor is used in a humid environment, the carbon composite encapsulation plate 3 and the carbon composite protective tube 2 can block the influence of the external environment on the optical fiber 1, prevent the fiber optic grating sensor from rusting, cracking, weakening strength, and other defects, and improve the tensile strength of the fiber optic grating sensor, thereby ensuring the stable operation of the fiber optic grating sensor and extending its service life in humid environments.

[0025] Please combine 3 and Figure 4The optical fiber 1 includes a core 101, on which a cladding 102 and a coating 103 are sequentially wrapped from the inside out. By sequentially wrapping the core 101 with the cladding 102 and the coating 103, the optical fiber 1 protects the core 101 and reduces the risk of damage during the encapsulation process.

[0026] In detail, the carbon composite protective tube 2 wraps around the coating layer 103 and is formed into an integral structure with the optical fiber 1. The carbon composite protective tube 2 can be directly formed on the surface of the optical fiber 1, ensuring reliable fit between the carbon composite protective tube 2 and the optical fiber 1 while preventing the optical fiber 1 from breaking during insertion into the carbon composite protective tube 2.

[0027] like Figure 3 As shown, sensing units 104 are etched on the optical fiber 1, and the number of sensing units 104 is at least one. The number, spacing, and center wavelength of the sensing units 104 etched on the optical fiber 1 can be set according to usage requirements to meet the needs of different scenarios. The reflectivity of the sensing units 104 is between 0.001% and 0.1%, which can be used to form a dense grating array through time-division or wavelength-division multiplexing, thereby facilitating resolution in the time domain.

[0028] In this embodiment, the optical fiber 1 is a quartz optical fiber 1, but it can also be any one of sapphire optical fiber 1, YAG crystal optical fiber 1, or photonic crystal optical fiber 1. The type of optical fiber 1 can be flexibly selected according to the usage environment, the object being detected, etc., so that the optical fiber grating sensor packaged with the fiber grating sensor packaging structure is adapted to the usage scenario.

[0029] like Figure 1 and Figure 2 As shown, the carbon composite encapsulation plate 3 has a mounting groove 301, and the carbon composite protective tube 2 fits into the mounting groove 301. The mounting groove 301 on the carbon composite encapsulation plate 3 is provided to accommodate the carbon composite protective tube 2, so as to position the carbon composite protective tube 2 on the carbon composite encapsulation plate 3 during the encapsulation process, which facilitates the assembly of the fiber optic grating sensor encapsulation structure.

[0030] Specifically, an adhesive layer is provided between the carbon composite encapsulation plate 3 and the carbon composite protective tube 2, which bonds the carbon composite encapsulation plate 3 and the carbon composite protective tube 2 into an integral structure. By providing the adhesive layer to bond the carbon composite encapsulation plate 3 and the carbon composite protective tube 2, the connection between the carbon composite encapsulation plate 3 and the carbon composite protective tube 2 is made reliable, ensuring that the position of the carbon composite protective tube 2 on the carbon composite encapsulation plate 3 remains stable.

[0031] Optionally, the carbon composite encapsulation plate 3 and the carbon composite protective tube 2 are integral structures formed by die casting or braiding. The carbon composite encapsulation plate 3 and the carbon composite protective tube 2 can also be integrally formed by die casting or braiding during the production process. When encapsulating the optical fiber 1 using the fiber optic grating sensor encapsulation structure, the optical fiber 1 is inserted into the carbon composite protective tube 2, and the mounting base 4 is fixed to the carbon composite encapsulation plate 3 to complete the encapsulation. This not only enhances the connection strength between the carbon composite encapsulation plate 3 and the carbon composite protective tube 2 but also facilitates the assembly of the fiber optic grating sensor encapsulation structure.

[0032] Please refer to Figure 1 and Figure 3 The mounting base 4 has a threaded hole and a mounting bolt that mates with the threaded hole, and the carbon composite encapsulation plate 3 has a through hole aligned with the threaded hole. When the mounting base 4 is fixed to the carbon composite encapsulation plate 3, the mounting bolt is passed through the through hole and engaged with the threaded hole to lock the mounting base 4 onto the carbon composite encapsulation plate 3. The installation operation is simple and the connection is reliable.

[0033] like Figure 1 and Figure 2 As shown, fiber optic connectors 5 are provided at both ends of the fiber optic cable 1. The fiber optic connectors 5 at both ends of the fiber optic cable 1 are used to connect the fiber optic cable grating sensor to the detection device, so as to facilitate the use of the fiber optic cable grating sensor packaged with the fiber optic cable grating sensor packaging structure.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A fiber Bragg grating sensor packaging structure, comprising an optical fiber, characterized in that: It also includes a mounting base, a carbon composite encapsulation plate, and a carbon composite protective tube. There are two mounting bases, which are located at opposite ends of the carbon composite encapsulation plate and are fixedly connected to the carbon composite encapsulation plate. The carbon composite protective tube is sleeved on the optical fiber and is located between the carbon composite encapsulation plate and the mounting base. The carbon composite encapsulation plate presses the carbon composite protective tube tightly onto the mounting base.

2. The fiber Bragg grating sensor packaging structure as described in claim 1, characterized in that: The optical fiber includes a core, and the core is wrapped with a cladding layer and a coating layer from the inside out.

3. The fiber Bragg grating sensor packaging structure as described in claim 2, characterized in that: The carbon composite protective tube wraps around the coating layer and is formed into an integral structure with the optical fiber.

4. The fiber Bragg grating sensor packaging structure as described in claim 1, characterized in that: The optical fiber has sensing units engraved on it, and the number of sensing units is at least one.

5. The fiber Bragg grating sensor packaging structure as described in claim 1, characterized in that: The optical fiber is any one of quartz optical fiber, sapphire optical fiber, YAG crystal optical fiber, or photonic crystal optical fiber.

6. The fiber Bragg grating sensor packaging structure as described in claim 1, characterized in that: The carbon composite encapsulation plate is provided with a mounting groove, and the carbon composite protective tube fits into the mounting groove.

7. The fiber Bragg grating sensor packaging structure as described in claim 1, characterized in that: An adhesive layer is provided between the carbon composite encapsulation board and the carbon composite protective tube, and the adhesive layer bonds the carbon composite encapsulation board and the carbon composite protective tube into an integrated structure.

8. The fiber Bragg grating sensor packaging structure as described in claim 1, characterized in that: The carbon composite encapsulation plate and the carbon composite protective tube are either die-cast integral structures or braided integral structures.

9. The fiber Bragg grating sensor packaging structure as described in claim 1, characterized in that: The mounting base is provided with threaded holes and mounting bolts that mate with the threaded holes, and the carbon composite encapsulation plate is provided with through holes aligned with the threaded holes.

10. The fiber Bragg grating sensor packaging structure as described in claim 1, characterized in that: The optical fiber is equipped with optical fiber connectors at both ends.

Images