A composite intelligent optical fiber with temperature-sensitive color change and stress sensing function

Abstract

The utility model provides a kind of composite intelligent optical fiber with temperature-sensitive discoloration and stress sensing function, it is related to the cross field of optical fiber sensing and functional material, including central reinforcement, intelligent optical fiber group, bandaging tape, protective sleeve, the central reinforcement includes support main body and honeycomb limiting sleeve, the intelligent optical fiber group is provided with several, is enclosed in honeycomb limiting sleeve inside, the bandaging tape is set outside intelligent optical fiber group, the protective sleeve is set outside the bandaging tape.The utility model adopts above-mentioned a kind of composite intelligent optical fiber with temperature-sensitive discoloration and stress sensing function, through the innovative material and structure design, the function of optical fiber and intelligent leap are realized, the reliability, security and maintainability of this design greatly enhance optical cable, have broad application prospect in key infrastructure monitoring field.

Description

Technical Field

[0001] This utility model relates to the interdisciplinary field of fiber optic sensing and functional materials, and in particular to a composite smart optical fiber with temperature-sensitive color change and stress sensing functions. Background Technology

[0002] Optical fiber, also known as optical waveguide fiber, is a thin medium made of high-purity glass or plastic that transmits light signals using the principle of total internal reflection. Its core structure consists of a core with a high refractive index and a cladding with a low refractive index, which confines light waves within the core for efficient transmission.

[0003] As the cornerstone of modern information society, optical fiber is widely used in global communication networks, fiber-to-the-home, data center interconnection and other fields due to its advantages such as ultra-large capacity, extremely low loss, resistance to electromagnetic interference and high confidentiality. The current protective coating of optical fiber mainly uses acrylic resin or silicone rubber materials, and its function is limited to mechanical protection and refractive index matching.

[0004] The conductive coating disclosed in US20180017621A1 only enables single-parameter (temperature or strain) detection. Japanese Patent Application Publication No. 2019-125304 adds phosphor to the coating, but it suffers from low signal-to-noise ratio (<15dB) and photobleaching problems. Although carbon fiber reinforced coatings (such as EP3361234B1) improve mechanical strength, they lead to a 30% increase in fiber bending loss.

[0005] Therefore, there is an urgent need for a composite smart optical fiber with temperature-sensitive color-changing and stress-sensing functions to improve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a composite smart optical fiber with thermochromic and stress-sensing functions. Addressing the technical shortcomings of existing optical fiber coatings that cannot monitor microbending loss and thermal stability in real time, a multi-layer composite structure solution is proposed: 1) The inner layer uses a polyimide substrate doped with CdSe / ZnS quantum dots to achieve defect fluorescent labeling; 2) The middle layer constructs a three-dimensional conductive network of carbon nanotubes for stress sensing, with a resistance change rate of 0.5Ω / ℃; 3) The outer layer is deposited with photochromic V... The thin film undergoes a reversible phase transition at 55°C, accompanied by a significant color change.

[0007] This utility model provides a composite smart optical fiber with temperature-sensitive color-changing and stress-sensing functions, comprising:

[0008] A central reinforcing member, comprising a supporting body and a honeycomb limiting sleeve;

[0009] A smart fiber optic assembly, wherein several smart fiber optic assemblies are provided and are fitted inside a cellular limiting sleeve;

[0010] A bandage is provided on the outside of the intelligent fiber optic assembly;

[0011] A protective sleeve is disposed outside the bandage.

[0012] Preferably, the intelligent optical fiber assembly includes a fiber core and a three-layer composite structure;

[0013] The three-layer composite structure is disposed on the outside of the fiber core.

[0014] Preferably, the three-layer composite structure includes a substrate layer, a conductive network layer, and a thin film layer;

[0015] The substrate layer is a polyimide substrate containing CdSe / ZnS quantum dots disposed on the outside of the fiber core;

[0016] The conductive network layer is a three-dimensional conductive network of single-walled carbon nanotubes, which is disposed on the outside of the substrate layer;

[0017] The thin film layer is V A temperature-sensitive phase change film is disposed on the outside of the conductive network layer.

[0018] Preferably, the honeycomb limiting sleeve includes a main sleeve body and an auxiliary sleeve body;

[0019] The main sleeve is fitted and fixed onto the supporting body;

[0020] The auxiliary sleeve is used to limit the position of the intelligent optical fiber group.

[0021] Preferably, the bandage is either a polyester bandage or a steel-plastic composite bandage;

[0022] The bandage secures and binds the central reinforcing member and the intelligent fiber optic assembly.

[0023] Preferably, fillers are provided between the fiber core and the honeycomb limiting sleeve, between the gaps in the honeycomb limiting sleeve, and between the honeycomb limiting sleeve and the wrapping tape.

[0024] Preferably, the filler is fiber paste, which is used to protect the optical fiber from damage.

[0025] Preferably, the protective sleeve includes a protective outer skin and protective teeth;

[0026] The protective teeth are arranged in a cone shape and are several in number;

[0027] The protective teeth are dispersedly fixed to the protective outer skin.

[0028] Therefore, this utility model adopts the above-mentioned composite smart optical fiber with temperature-sensitive color-changing and stress-sensing functions, and the technical effects are as follows:

[0029] 1. Employing quantum dot polyimide substrate, carbon nanotube conductive layer, and V The three-layer composite structure composed of a temperature-sensitive film enables the optical fiber to have stress sensing and temperature-sensitive color-changing capabilities, allowing for real-time monitoring of the line status.

[0030] 2. The mechanical design of the honeycomb limiting sleeve and tapered protective teeth significantly improves the fiber's resistance to pressure and impact, while the filler and wrapping tape ensure environmental sealing and structural stability. Attached Figure Description

[0031] Figure 1 This is a cross-sectional schematic diagram of a composite intelligent optical fiber with temperature-sensitive color-changing and stress-sensing functions according to the present invention.

[0032] Figure 2 This is a cross-sectional schematic diagram of the intelligent fiber optic group in a composite intelligent optical fiber with temperature-sensitive color-changing and stress-sensing functions according to the present invention.

[0033] Figure 3 This is a planar schematic diagram of a composite intelligent optical fiber with temperature-sensitive color-changing and stress-sensing functions according to this utility model.

[0034] Figure Labels

[0035] 1. Central reinforcement; 11. Support body; 12. Cellular limiting sleeve; 121. Main sleeve; 122. Auxiliary sleeve; 2. Intelligent optical fiber group; 21. Fiber core; 22. Three-layer composite structure; 221. Substrate layer; 222. Conductive network layer; 223. Thin film layer; 3. Packing tape; 4. Protective sleeve; 41. Protective outer skin; 42. Protective teeth; 5. Filler. Detailed Implementation

[0036] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0037] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0038] Example 1

[0039] like Figure 1 , Figure 3 As shown, a composite smart optical fiber with temperature-sensitive color-changing and stress-sensing functions is mainly used in power communication, aerospace, and medical endoscopy. It mainly consists of a central reinforcing member 1, a smart optical fiber group 2, a wrapping tape 3, and a protective sleeve 4.

[0040] The central reinforcing component 1 includes a supporting body 11 and a honeycomb limiting sleeve 12. The central reinforcing component 1 is the core load-bearing structure of the optical fiber, consisting of a high-strength supporting body 11 and an innovatively designed honeycomb limiting sleeve 12.

[0041] Furthermore, the cellular limiting sleeve 12 includes a main sleeve 121 and an auxiliary sleeve 122. The main sleeve 121 is fitted and fixed on the support body 11, and the auxiliary sleeve 122 is used to limit the intelligent optical fiber group 2. The cellular limiting sleeve 12 adopts a composite design of the main sleeve 121 and the auxiliary sleeve 122: the main sleeve 121 is tightly fixed to the surface of the support body 11 to form a basic support frame; the auxiliary sleeve 122 extends out a honeycomb-shaped precision limiting groove to realize the individualized and precise positioning and restraint of multiple intelligent optical fiber groups 2.

[0042] This design ensures that the optical fibers are evenly distributed and maintain a stable relative position within the cable core through the high space utilization of the honeycomb structure. The mechanical isolation effect of the honeycomb limiting sleeve 12 effectively prevents the optical fibers from squeezing and rubbing against each other, reducing the risk of micro-bending loss. The elastic limiting structure of its auxiliary sleeve 122 provides moderate degrees of freedom for the intelligent optical fiber group 2, alleviating the direct transmission of external mechanical stress to the sensitive optical fiber.

[0043] Several intelligent fiber optic groups 2 are set up and are installed inside the cellular limiting sleeve 12.

[0044] Furthermore, such as Figure 2 As shown, the intelligent optical fiber group 2 includes a fiber core 21 and a three-layer composite structure 22.

[0045] The three-layer composite structure 22 is disposed on the outside of the fiber core 21.

[0046] Furthermore, the three-layer composite structure 22 includes a substrate layer 221, a conductive network layer 222, and a thin film layer 223.

[0047] The substrate layer 221 is a polyimide substrate containing CdSe / ZnS quantum dots (quantum dot concentration 0.5-1.2wt%), which is disposed on the outside of the fiber core 21. The excitation wavelength of the quantum dots is 405nm, and the half width at half maximum of the emission spectrum is <30nm.

[0048] The conductive network layer 222 is a three-dimensional conductive network of single-walled carbon nanotubes (density ≥ 20 tubes / μm²), which is disposed outside the substrate layer 221. The resistance change rate of the carbon nanotube network is linearly related to the applied stress (sensitivity coefficient ≥ 2.5).

[0049] Thin film layer 223 is V A temperature-sensitive phase change film (50-80 nm thick) is disposed on the outside of the conductive network layer 222.

[0050] V The phase transition temperature of the thermosensitive phase change film is 55±2℃, and it exhibits a reversible color change from transparent to deep red during the phase transition.

[0051] The preparation method of the three-layer composite structure 22 includes the following steps:

[0052] S1. A quantum dot doped layer is formed on the surface of a bare fiber by vapor deposition.

[0053] S2. Construct carbon nanotube networks using electrophoresis (voltage 12V, time 3-5min).

[0054] S3, magnetron sputtering deposition V Thin film (substrate temperature 150±5℃).

[0055] The wrapping tape 3 is placed on the outside of the intelligent optical fiber group 2. The wrapping tape 3 is a type of polyester tape or steel-plastic composite tape, which fixes and binds the central reinforcing member 1 and the intelligent optical fiber group 2.

[0056] The protective sleeve 4 is placed outside the bandage 3. The protective sleeve 4 includes a protective outer skin 41 and protective teeth 42.

[0057] Several protective teeth 42 are arranged in a cone shape and are dispersedly fixed to the protective outer sheath 41. The protective teeth 42 are made of high-strength engineering plastic or metal materials and are firmly embedded in the surface of the protective outer sheath 41 in a dispersed manner to form a multi-layer defense system. The tip of each cone-shaped protective tooth 42 faces the outside of the cable body. The tooth base and the protective outer sheath 41 are structurally fused by a co-extrusion molding process, and the tooth body is designed with a reinforcing rib structure to ensure mechanical strength.

[0058] Furthermore, fillers 5 are provided between the fiber core 21 and the honeycomb limiting sleeve 12, between the gaps in the honeycomb limiting sleeve 12, and between the honeycomb limiting sleeve 12 and the wrapping tape 3.

[0059] Furthermore, filler 5 is fiber optic paste, which is used for the airtight protection of the optical fiber. Fiber optic paste is a paste-like or gel-like waterproof compound. Its function is to fill all gaps and prevent the intrusion of moisture. Because once water enters the optical cable, it will freeze and expand at low temperatures, damaging the optical fiber, and will also cause signal attenuation in the long term. Fiber optic paste is like "waterproof putty," sealing the entire internal space.

[0060] Therefore, this utility model adopts the above-mentioned composite smart optical fiber with temperature-sensitive color change and stress sensing functions. The coating achieves simultaneous monitoring of dual parameters with temperature resolution of ±0.5℃ and stress detection threshold of 0.3N through the energy transfer mechanism of quantum dot-carbon nanotube heterojunction. It is also compatible with standard 125μm optical fiber and is suitable for real-time status monitoring in harsh working conditions such as high-voltage cables and aerospace.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the 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 still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A composite smart optical fiber with thermosensitive color-changing and stress-sensing functions, characterized in that, include: A central reinforcing member, comprising a supporting body and a honeycomb limiting sleeve; A smart fiber optic assembly, wherein several smart fiber optic assemblies are provided and are fitted inside a cellular limiting sleeve; A bandage is provided on the outside of the intelligent fiber optic assembly; A protective sleeve is disposed outside the bandage.

2. The composite smart optical fiber with temperature-sensitive color-changing and stress-sensing functions according to claim 1, characterized in that, The intelligent optical fiber assembly includes a fiber core and a three-layer composite structure; The three-layer composite structure is disposed on the outside of the fiber core.

3. A composite smart optical fiber with thermosensitive color-changing and stress-sensing functions according to claim 2, characterized in that, The three-layer composite structure includes a substrate layer, a conductive network layer, and a thin film layer; The substrate layer is a polyimide substrate containing CdSe / ZnS quantum dots disposed on the outside of the fiber core; The conductive network layer is a three-dimensional conductive network of single-walled carbon nanotubes, which is disposed on the outside of the substrate layer; The thin film layer is V A temperature-sensitive phase change film is disposed on the outside of the conductive network layer.

4. The composite smart optical fiber with temperature-sensitive color-changing and stress-sensing functions according to claim 1, characterized in that, The honeycomb limiting sleeve includes a main sleeve body and an auxiliary sleeve body; The main sleeve is fitted and fixed onto the supporting body; The auxiliary sleeve is used to limit the position of the intelligent optical fiber group.

5. A composite smart optical fiber with thermosensitive color-changing and stress-sensing functions according to claim 3, characterized in that, The bandage is either polyester tape or steel-plastic composite tape; The bandage secures and binds the central reinforcing member and the intelligent fiber optic assembly.

6. A composite smart optical fiber with thermosensitive color-changing and stress-sensing functions according to claim 3, characterized in that, Fillers are provided between the fiber core and the honeycomb limiting sleeve, between the gaps in the honeycomb limiting sleeve, and between the honeycomb limiting sleeve and the wrapping tape.

7. A composite smart optical fiber with thermosensitive color-changing and stress-sensing functions according to claim 6, characterized in that, The filler is fiber paste, which is used to protect the optical fiber from damage.

8. A composite smart optical fiber with thermosensitive color-changing and stress-sensing functions according to claim 1, characterized in that, The protective sleeve includes a protective outer layer and protective teeth; The protective teeth are arranged in a cone shape and are several in number; The protective teeth are dispersedly fixed to the protective outer skin.

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