Hydrogen-sensitive optical fiber, coating device, protective structure and optical fiber hydrogen sensor

Abstract

The present application relates to the field of optical fiber sensing, and specifically to a hydrogen-sensitive sensing optical fiber, a coating device, a protective structure, and an optical fiber hydrogen sensor. The hydrogen-sensitive sensing optical fiber includes: an optical fiber body, including a grating segment and an optical fiber segment; a glass fiber layer, the glass fiber layer is wrapped around the grating segment, and the glass fiber layer is fixedly connected to the optical fiber segment; and a hydrogen-sensitive material layer is coated on the glass fiber layer. By laying a layer of glass fiber on the grating segment, and then coating the hydrogen-sensitive material on the glass fiber layer, since the coupling force between the glass fiber and the hydrogen-sensitive material is strong, the glass fiber layer is used to increase the coupling force between the hydrogen-sensitive material layer and the optical fiber body, thereby reducing the problem of hydrogen-sensitive material falling off, facilitating hydrogen to spread in the glass fiber layer through the pores in the glass fiber layer, increasing the contact area between the hydrogen-sensitive material layer and hydrogen, increasing the heating rate of the hydrogen-sensitive material layer when encountering hydrogen, and increasing the response speed of the hydrogen-sensitive sensing optical fiber to hydrogen.

Description

Technical Field

[0001] The present application relates to the field of optical fiber sensing, and in particular to a hydrogen-sensitive sensing optical fiber, a coating device, a protective structure, and an optical fiber hydrogen sensor. Background Art

[0002] With the proposal of energy conservation, emission reduction and achieving dual carbon goals, the use of clean energy, especially hydrogen energy, has always attracted much attention. With the gradual and widespread use of hydrogen energy, accidents caused by hydrogen leakage occur frequently, so the detection of hydrogen leakage and timely warning are of great significance to production safety. At present, there are solutions that use electrical sensors to detect hydrogen leaks, but the solution of using electrical sensors to detect hydrogen has poor safety and poor anti-interference ability.

[0003] In related technologies, in order to improve the safety and anti-interference ability of hydrogen sensors, a solution of using optical fiber hydrogen sensors to detect the content of hydrogen is adopted. Optical fiber hydrogen sensors use optical signals as sensing signals, which have higher safety and anti-interference than traditional electrical sensors, and show great potential in distributed measurement and remote monitoring. Among them, the fiber Bragg grating hydrogen sensor has attracted much attention from researchers due to its simple structure, small size and light weight. With the deepening of research, many scholars have produced sensors with better performance and applied them in experiments.

[0004] In the process of implementing relevant technologies, at least the following problems are found:

[0005] The hydrogen-sensitive material on the optical fiber body has problems such as difficulty in film formation and easy falling off, and the optical fiber hydrogen sensor has poor stability, which restricts the application of the sensor in practice. Summary of the invention

[0006] The embodiment of the present application provides a hydrogen-sensitive sensing optical fiber, a coating device, a protective structure, and an optical fiber hydrogen sensor. By arranging a glass fiber layer on the grating segment of the optical fiber and then coating the glass fiber layer with a hydrogen-sensitive material, the coupling force between the hydrogen-sensitive material and the optical fiber is improved, and the sensitivity of the hydrogen-sensitive sensing optical fiber to hydrogen is improved. When the optical fiber hydrogen sensor with the hydrogen-sensitive sensing optical fiber is used to detect the hydrogen concentration, the stability and response speed of the optical fiber hydrogen sensor are improved.

[0007] In some embodiments, a hydrogen-sensitive sensing optical fiber is provided, comprising: an optical fiber body, comprising a grating segment and an optical fiber segment; a glass fiber layer, the glass fiber layer is wrapped around the grating segment, and the glass fiber layer is fixedly connected to the optical fiber segment; and a hydrogen-sensitive material layer is coated on the glass fiber layer.

[0008] The hydrogen-sensitive sensing optical fiber provided in the embodiment of the present application is adopted, by laying a glass fiber layer on the grating segment, and then coating the hydrogen-sensitive material on the glass fiber layer. Since the coupling force between the glass fiber and the hydrogen-sensitive material is strong, the glass fiber layer is used to improve the coupling force between the hydrogen-sensitive material layer and the optical fiber body, thereby reducing the problem of hydrogen-sensitive material falling off. In addition, since the glass fiber is a loose and porous structure, it is convenient for hydrogen to spread in the glass fiber layer through the pores in the glass fiber layer, increase the contact area between the hydrogen-sensitive material layer and hydrogen, and increase the heating rate of the hydrogen-sensitive material layer when encountering hydrogen, thereby causing the grating segment to be affected by temperature and change the optical signal propagating therein, thereby improving the response speed of the hydrogen-sensitive sensing optical fiber to hydrogen.

[0009] Optionally, the glass fiber layer and the optical fiber segment are bonded by epoxy glue.

[0010] In some embodiments, a coating device is provided, which is used to produce a hydrogen-sensitive sensing optical fiber as provided in any of the above embodiments; the coating device includes: a substrate; a coating portion, which is opened on the substrate; an optical fiber fixing portion, which is opened on the substrate; the coating portion is used to set a grating segment wrapped with a glass fiber layer; and the optical fiber fixing portion is used to set the optical fiber segment.

[0011] The coating device provided in the embodiment of the present application is used, and the optical fiber fixing part and the coating part are arranged to set the optical fiber body wrapped with the glass fiber layer on the coating device, and then the optical fiber segment is fixed by the optical fiber fixing part. The grating segment is arranged by the coating part, and the hydrogen-sensitive material is coated on the glass fiber layer outside the grating segment to form a hydrogen-sensitive material layer on the glass fiber layer, thereby realizing the production of hydrogen-sensitive sensing optical fiber.

[0012] Optionally, the coating portion includes: a first groove; the depth of the first groove is H1, the outer diameter of the grating segment is D1, and the thickness of the glass fiber layer is L; H1>D1+L.

[0013] Optionally, the optical fiber fixing portion includes: a second groove; the depth of the second groove is H2, and the outer diameter of the optical fiber segment is D2; H2≥D2.

[0014] Optionally, the first groove; the depth of the first groove is H1, the outer diameter of the grating segment is D1, and the thickness of the glass fiber layer is L; H1>D1+L; the optical fiber fixing part includes: the second groove; the depth of the second groove is H2, and the outer diameter of the optical fiber segment is D2; H2≥D2.

[0015] Optionally, the second groove includes: a first sub-groove, the first sub-groove is used to place the optical fiber segment; a second sub-groove, the second sub-groove is arranged on both sides of the first sub-groove, and the depth of the second sub-groove is less than the depth of the first sub-groove; wherein, tape is used to bond the groove wall of the second sub-groove and the optical fiber segment to fix the optical fiber segment.

[0016] In some embodiments, a method for manufacturing a hydrogen-sensitive sensing optical fiber is provided, which is used to manufacture a hydrogen-sensitive sensing optical fiber as provided in any of the above embodiments, and the manufacturing method includes: S1: coating a hydrophobic material on a coating portion of a coating device; S2: wrapping a layer of glass fiber on a grating segment of an optical fiber body; S3: arranging the grating segment wrapped with glass fiber on the coating portion of a coating device; S4: arranging the optical fiber segment of the optical fiber body on an optical fiber fixing portion of a coating device, and using tape to bond the optical fiber segment and the optical fiber fixing portion; S5: coating a layer of hydrogen-sensitive material on the glass fiber layer.

[0017] The manufacturing method of the hydrogen-sensitive sensing optical fiber provided in the embodiment of the present application is adopted, by wrapping a layer of glass fiber on the outside of the grating segment, and then coating the glass fiber with hydrogen-sensitive material, the coupling strength between the optical fiber body and the hydrogen-sensitive material is improved, and the stability of the optical fiber body is improved. By coating the hydrogen-sensitive material on the coating device, the optical fiber body is fixed to reduce the problem of inaccurate coating position caused by the movement of the optical fiber body, and the overflow problem during the coating of the hydrogen-sensitive material can be reduced.

[0018] In some embodiments, a protective structure for a hydrogen-sensitive sensing optical fiber is provided, and the protective structure for the hydrogen-sensitive sensing optical fiber is configured to allow the hydrogen-sensitive sensing optical fiber to pass through and protect the hydrogen-sensitive sensing optical fiber; the hydrogen-sensitive sensing optical fiber includes: a hydrogen-sensitive sensing optical fiber as provided in any of the above embodiments, or a hydrogen-sensitive sensing optical fiber manufactured by a coating device as provided in any of the above embodiments, or a hydrogen-sensitive sensing optical fiber manufactured by a method for manufacturing a hydrogen-sensitive sensing optical fiber as provided in the above embodiments; the protective structure for the hydrogen-sensitive sensing optical fiber includes: a support assembly, the support assembly is configured to provide support for the hydrogen-sensitive sensing optical fiber; a protective assembly, detachably connected to the support assembly; the support assembly and the protective assembly are sleeved on the hydrogen-sensitive sensing optical fiber.

[0019] The protective structure of the hydrogen-sensitive sensing optical fiber provided in the embodiment of the present application can improve the protection capability of the hydrogen-sensitive sensing optical fiber, reduce damage to the hydrogen-sensitive sensing optical fiber, and improve the stability of the optical fiber hydrogen-sensitive sensor formed by the protective structure of the hydrogen-sensitive sensing optical fiber and the hydrogen-sensitive sensing optical fiber.

[0020] Optionally, the supporting assembly includes: a main pipe, including a first end and a second end; the optical fiber segment on one side of the grating segment of the hydrogen-sensitive sensing optical fiber is inserted into the main pipe; an optical fiber lifting plate is fixedly connected to the first end of the main pipe; and the grating segment of the hydrogen-sensitive sensing optical fiber is arranged on the optical fiber lifting plate.

[0021] Optionally, the optical fiber lifting plate includes: a metal plate fixedly connected to the first end of the main pipe; a fixing hole is opened on the metal plate; a bracket is fixedly arranged on the hole wall of the fixing hole; and the bracket is configured to support the grating segment of the optical fiber body.

[0022] In some embodiments, a fiber optic hydrogen sensor is provided, comprising: a protective structure for a hydrogen-sensitive sensing optical fiber as provided in any of the above embodiments; a hydrogen-sensitive sensing optical fiber, wherein the hydrogen-sensitive sensing optical fiber is passed through the protective structure for the hydrogen-sensitive sensing optical fiber; the hydrogen-sensitive sensing optical fiber comprises the hydrogen-sensitive sensing optical fiber as provided in any of the above embodiments, or a hydrogen-sensitive sensing optical fiber manufactured by a coating device as provided in any of the above embodiments, or a hydrogen-sensitive sensing optical fiber manufactured by a method for manufacturing a hydrogen-sensitive sensing optical fiber as provided in the above embodiments.

[0023] The optical fiber hydrogen sensor provided in the embodiment of the present application is used to improve the response speed of the optical fiber hydrogen sensor to hydrogen detection by using the hydrogen-sensitive sensing optical fiber used in the embodiment of the present application, and reduce the problem of easy detachment of the hydrogen-sensitive material layer. In addition, the hydrogen-sensitive sensing optical fiber is protected by using a protective structure of the hydrogen-sensitive sensing optical fiber, thereby improving the stability of the optical fiber hydrogen sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A schematic diagram of the structure of a hydrogen-sensitive sensing optical fiber provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1 A cross-sectional view along the axial direction of the hydrogen-sensitive sensing optical fiber in the illustrated embodiment;

[0027] Figure 3 A schematic diagram of the structure of a coating device provided in an embodiment of the present application;

[0028] Figure 4 for Figure 3 A cross-sectional view of the coating device in the illustrated embodiment;

[0029] Figure 5 for Figure 3 A schematic diagram of manufacturing a hydrogen-sensitive sensing optical fiber in the embodiment shown;

[0030] Figure 6 A flowchart of a method for manufacturing a hydrogen-sensitive sensing optical fiber provided in an embodiment of the present application;

[0031] Figure 7 A cross-sectional view of a protective structure of a hydrogen-sensitive sensing optical fiber provided in an embodiment of the present application;

[0032] Figure 8 A schematic diagram of the structure of the support assembly provided in an embodiment of the present application;

[0033] Fig. 9 A schematic diagram of the structure of the protection component provided in the embodiment of the present application;

[0034] Fig.10 for Figure 8 An enlarged schematic diagram of a first end of a main tube and a fiber lift plate in a support assembly provided by the illustrated embodiment;

[0035] Fig.11 A schematic diagram of the structure of a first protective tube provided in an embodiment of the present application;

[0036] Fig.12 A schematic diagram of the structure of a second protective tube provided in an embodiment of the present application;

[0037] Fig.13 A schematic diagram of the structure of a support assembly and a hydrogen-sensitive sensing optical fiber in an optical fiber hydrogen sensor provided in an embodiment of the present application;

[0038] Fig.14 This is a structural block diagram of the optical fiber hydrogen sensing system provided in an embodiment of the present application.

[0039] Reference numerals:

[0040] 1. Hydrogen-sensitive sensing optical fiber; 11. Optical fiber body; 111. Grating segment; 112. Optical fiber segment; 12. Glass fiber layer; 13. Hydrogen-sensitive material layer; 14. Epoxy glue;

[0041] 2. Coating device; 21. Substrate; 221. First groove; 231. Second groove; 2311. First sub-groove; 2312. Second sub-groove; 24. Adhesive tape;

[0042] 3. Protection structure of hydrogen-sensitive sensing optical fiber; 31. Support assembly; 311. Main pipe; 3111. Through hole; 312. Optical fiber lifting plate; 3121. Metal plate; 3122. Bracket; 3123. Fixing hole; 3124. Optical fiber fixing groove; 313. First connecting part; 314. Second connecting part; 32. Protection assembly; 321. First protection tube; 322. Second protection tube; 3221. Second vent hole; 323. Third connecting part; 324. Fourth connecting part;

[0043] 4. Fiber optic hydrogen sensor;

[0044] 5. Fiber optic hydrogen sensing system; 51. Fiber optic demodulator; 52. Electronic equipment; 521. Computer; 522. Mobile phone. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, other embodiments obtained by ordinary technicians in this field without making creative work all belong to the protection scope of the present application.

[0046] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0047] In addition, in the present application, directional terms such as "upper", "lower", "inner" and "outer" are defined relative to the orientation of the components schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the changes in the orientation of the components placed in the drawings.

[0048] In order to facilitate the understanding of the technical solution of the application, the relevant technologies involved in this application are first explained below.

[0049] With the proposal of energy conservation, emission reduction and achieving dual carbon goals, the use of clean energy, especially hydrogen energy, has always attracted much attention. With the gradual and widespread use of hydrogen energy, accidents caused by hydrogen leakage occur frequently, so the detection and timely warning of hydrogen leakage are of great significance to production safety.

[0050] At present, there are schemes for detecting hydrogen leaks using electrical sensors. The detection mechanisms of electrical hydrogen sensors generally include: semiconductor, capacitive, metal hydride and field effect transistor. For example, the detection principle of semiconductor hydrogen sensors is: the presence of hydrogen will change the capacitance value between the sensor electrodes, which is usually achieved through a thin film or multilayer structure, but semiconductor hydrogen sensors have the disadvantage of being easily affected by electromagnetic interference. The detection principle of capacitive hydrogen sensors is: certain metals (such as palladium and platinum) undergo hydrogenation reactions when adsorbing hydrogen to change their conductivity, but capacitive hydrogen sensors have the disadvantages of being more expensive and more sensitive to impurities. The detection principle of metal hydride hydrogen sensors is: using sensitive materials on the gate of a field effect transistor, the adsorption of hydrogen will change the gate potential, thereby adjusting the conduction state of the device, but metal hydride hydrogen sensors have the disadvantages of being complex to manufacture and being easily affected by environmental noise.

[0051] In summary, the solution of using electrical sensors to detect hydrogen has the problems of complex manufacturing, high cost, poor detection capability, poor safety and poor anti-interference ability.

[0052] In related technologies, in order to improve the safety and anti-interference ability of hydrogen sensors, a solution of using optical fiber hydrogen sensors to detect the content of hydrogen is adopted. Optical fiber hydrogen sensors use optical signals as sensing signals, which have higher safety and anti-interference than traditional electrical sensors, and show great potential in distributed measurement and remote monitoring. Among them, the fiber Bragg grating hydrogen sensor has attracted much attention from researchers due to its simple structure, small size and light weight. With the deepening of research, many scholars have produced sensors with better performance and applied them in experiments.

[0053] However, the hydrogen-sensitive material on the optical fiber body is difficult to form a film and is easy to fall off, and the optical fiber hydrogen sensor has poor stability, which restricts the application of the sensor in practice.

[0054] In order to solve the above technical problems, the embodiment of the present application provides a hydrogen-sensitive sensing optical fiber 1, a coating device 2, a manufacturing method, a protective structure and an optical fiber hydrogen sensor 4, by providing a glass fiber layer 12 on the grating segment 111 of the optical fiber, and then coating the glass fiber layer 12 with a hydrogen-sensitive material, thereby improving the coupling force between the hydrogen-sensitive material and the optical fiber, and improving the sensitivity of the hydrogen-sensitive sensing optical fiber 1 to hydrogen. When the optical fiber hydrogen sensor 4 with the hydrogen-sensitive sensing optical fiber 1 is used to detect the hydrogen concentration, the stability and response speed of the optical fiber hydrogen sensor 4 are improved.

[0055] Figure 1 This is a schematic diagram of the structure of the hydrogen-sensitive sensing optical fiber provided in an embodiment of the present application.

[0056] Figure 2 for Figure 1 A cross-sectional view along the axial direction of the hydrogen-sensitive sensing optical fiber in the illustrated embodiment.

[0057] Combination Figure 1 and Figure 2 As shown, the embodiment of the present application provides a hydrogen-sensitive sensing optical fiber 1, comprising: an optical fiber body 11, a glass fiber layer 12 and a hydrogen-sensitive material layer 13. The optical fiber body 11 comprises a grating segment 111 and an optical fiber segment 112. The glass fiber layer 12 is wrapped around the grating segment 111, and the glass fiber layer 12 is fixedly connected to the optical fiber segment 112. The hydrogen-sensitive material layer 13 is coated on the glass fiber layer 12.

[0058] The hydrogen-sensitive sensing optical fiber 1 provided in the embodiment of the present application is adopted, by laying a glass fiber layer 12 on the grating segment 111, and then coating the hydrogen-sensitive material on the glass fiber layer 12. Since the coupling force between the glass fiber and the hydrogen-sensitive material is strong, the glass fiber layer 12 is used to improve the coupling force between the hydrogen-sensitive material layer 13 and the optical fiber body 11, thereby reducing the problem of hydrogen-sensitive material falling off. In addition, since the glass fiber is a loose and porous structure, it is convenient for hydrogen to spread in the glass fiber layer 12 through the pores in the glass fiber layer 12, increase the contact area between the hydrogen-sensitive material layer 13 and hydrogen, and increase the heating rate of the hydrogen-sensitive material layer 13 when encountering hydrogen, thereby causing the grating segment 111 to change the light signal propagating therein under the influence of temperature, thereby improving the response speed of the hydrogen-sensitive sensing optical fiber 1 to hydrogen.

[0059] Optionally, combined Figure 2 As shown, the glass fiber layer 12 and the optical fiber segment 112 are bonded together by epoxy glue 14 .

[0060] In this embodiment, the glass fiber layer 12 and the optical fiber segment 112 are fixed by using epoxy glue 14 to improve the bonding strength between the optical fiber segment 112 and the glass fiber layer 12, thereby reducing the problem of glass fiber falling off from the optical fiber segment 112 and thus reducing the problem of glass fiber falling off from the grating segment 111.

[0061] For example, in combination Figure 2 As shown, the epoxy adhesive 14 is coated at the position where the glass fiber layer 12 and the optical fiber segment 112 are fixedly connected.

[0062] Figure 3 A schematic diagram of the structure of a coating device provided in an embodiment of the present application.

[0063] Figure 4 for Figure 3 A cross-sectional view of a coating apparatus in the illustrated embodiment.

[0064] Combination Figure 1 and Figure 2 The hydrogen-sensitive sensing optical fiber 1 shown in the figure, the embodiment of the present application also provides a coating device 2, such as Figure 3 and Figure 4 As shown, the coating device 2 is used to produce the hydrogen-sensitive sensing optical fiber 1 provided in any one of the above embodiments; the coating device 2 comprises: a substrate 21, a coating part and an optical fiber fixing part. The coating part and the optical fiber fixing part are provided on the substrate 21. The coating part is used to set the grating segment 111 wrapped with the glass fiber layer 12. The optical fiber fixing part is used to set the optical fiber segment 112.

[0065] The coating device 2 provided in the embodiment of the present application is used, and after the optical fiber body 11 wrapped with the glass fiber layer 12 is set on the coating device 2 by setting the optical fiber fixing part and the coating part, the optical fiber fixing part is used to fix the optical fiber segment 112. The grating segment 111 is set by the coating part, and the hydrogen-sensitive material is coated on the glass fiber layer 12 outside the grating segment 111 to form a hydrogen-sensitive material layer 13 on the glass fiber layer 12, thereby realizing the manufacture of the hydrogen-sensitive sensing optical fiber 1.

[0066] Figure 5 for Figure 3 A schematic diagram of manufacturing a hydrogen-sensitive sensing optical fiber in the embodiment shown.

[0067] For example, in combination Figure 5 As shown, when manufacturing the hydrogen-sensitive sensing optical fiber 1 provided in the embodiment of the present application, a glass fiber layer 12 is firstly wrapped on the outer peripheral side of the grating segment 111, and the two ends of the glass fiber layer 12 corresponding to the optical fiber segment 112 are respectively bonded to the optical fiber segment 112 using epoxy glue 14. A layer of hydrophobic material is applied to the coating part and the optical fiber fixing part of the coating device 2. The optical fiber body 11 bonded with the glass fiber is placed on the coating device 2, the grating segment 111 is arranged in the coating part, and the optical fiber segments 112 at both ends of the grating segment 111 are respectively arranged in the optical fiber fixing parts on the opposite sides of the coating part. Then, a hydrogen-sensitive material is coated on the glass fiber in the coating part to form a hydrogen-sensitive material layer 13. The manufacture of the hydrogen-sensitive sensing optical fiber 1 is realized.

[0068] Exemplarily, the length of the substrate 21 is 6 cm, the width is 6 cm, and the thickness is 1 cm. The material of the substrate 21 is quartz.

[0069] Optionally, the optical fiber fixing portion includes a first fixing portion and a second fixing portion respectively disposed on opposite sides of the coating portion, so as to use the first fixing portion and the second fixing portion to respectively fix the optical fiber segment 112 on opposite sides of the grating segment 111 .

[0070] Optionally, combined Figure 3 and Figure 4 As shown, the coating portion includes: a first groove 221. The depth of the first groove 221 is H1, the outer diameter of the grating segment 111 is D1, and the thickness of the glass fiber layer 12 is L. H1>D1+L.

[0071] In this embodiment, the first groove 221 is provided so that the grating segment 111 wrapped with the glass fiber layer 12 can be placed in the first groove 221 when manufacturing the hydrogen-sensitive sensing optical fiber 1. In this way, when coating the hydrogen-sensitive material, the overflow of the hydrogen-sensitive material caused by the glass fiber layer 12 being higher than the upper surface of the coating device 2 is reduced.

[0072] Exemplarily, the first groove 221 has a width of 1.5 mm, a length of 2 cm, and a depth of 1 mm.

[0073] Optionally, combined Figure 3 and Figure 4 As shown, the optical fiber fixing portion includes: a second groove 231. The depth of the second groove 231 is H2, and the outer diameter of the optical fiber segment 112 is D2. H2≥D2.

[0074] In this embodiment, the second groove 231 is provided to place the optical fiber segment 112 when manufacturing the hydrogen-sensitive sensing optical fiber 1, so as to fix the optical fiber segment 112. In this way, when coating the hydrogen-sensitive material, the problem of inaccurate coating position caused by optical fiber movement is reduced.

[0075] Optionally, combined Figure 3 and Figure 4 As shown, the coating part includes: a first groove 221. The optical fiber fixing part includes: a second groove 231. The first groove 221 is connected to the second groove 231. The depth of the first groove 221 is H1, the outer diameter of the grating segment 111 is D1, and the thickness of the glass fiber layer 12 is L. H1>D1+L. The depth of the second groove 231 is H2, and the outer diameter of the optical fiber segment 112 is D2. H2≥D2. H1>H2.

[0076] In this embodiment, by limiting the depth of the second groove 231 to be smaller than the depth of the first groove 221, the hydrogen-sensitive material coated in the first groove 221 can be reduced from flowing into the second groove 231 along the connection between the first groove 221 and the second groove 231, thereby improving the accuracy of the coating position of the hydrogen-sensitive material.

[0077] Optionally, the second groove 231 includes: a first sub-groove 2311 and a second sub-groove 2312. The first sub-groove 2311 is used to place the optical fiber segment 112. The second sub-groove 2312 is arranged on both sides of the first sub-groove 2311, and the depth of the second sub-groove 2312 is less than the depth of the first sub-groove 2311. The tape 24 is used to bond the groove wall of the second sub-groove 2312 and the optical fiber segment 112 to fix the optical fiber segment 112.

[0078] In this embodiment, by providing the first sub-groove 2311 and the second sub-groove 2312, the first sub-groove 2311 is used to place the optical fiber segment 112 when manufacturing the hydrogen-sensitive sensing optical fiber 1, and the optical fiber segment 112 is bonded and fixed to the groove wall of the second sub-groove 2312 using the adhesive tape 24, so as to fix the optical fiber segment 112. The problem of inaccurate coating position caused by optical fiber movement is reduced.

[0079] Specifically, the bottom wall of the second sub-groove 2312 is a platform, and after the optical fiber segment 112 is placed in the first sub-groove 2311 when manufacturing the hydrogen-sensitive sensing optical fiber 1, the adhesive tape 24 is used to bond and fix the optical fiber segment 112 and the bottom wall of the second sub-groove 2312. In this way, the contact area between the adhesive tape 24 fixing the optical fiber segment 112 and the groove wall of the second sub-groove 2312 is enlarged, and the firmness of the bonding is improved.

[0080] For example, the first sub-groove 2311 has a width of 0.5 mm and a depth of 0.5 mm, and the second sub-groove 2312 has a width of 1.5 cm, a depth of 0.25 mm, and a length of 2 cm.

[0081] It should be understood that the size of the substrate 21, the size of the first groove 221, the size of the first sub-groove 2311 and the size of the second sub-groove 2312 provided in the embodiment of the present application are set according to actual conditions, and the embodiment of the present application does not limit this.

[0082] Figure 6 A flow chart of a method for manufacturing a hydrogen-sensitive sensing optical fiber provided in an embodiment of the present application.

[0083] Combination Figure 6 As shown, the embodiment of the present application also provides a method for manufacturing a hydrogen-sensitive sensing optical fiber, the method for manufacturing a hydrogen-sensitive sensing optical fiber is used to manufacture a hydrogen-sensitive sensing optical fiber 1 provided in any one of the above embodiments, and the method for manufacturing a hydrogen-sensitive sensing optical fiber comprises steps S1 to S5, which are specifically as follows:

[0084] S1: Applying a water-repellent material to the coating part of the coating device 2 .

[0085] In this step, a hydrophobic material is first applied to the coating portion of the coating device 2 to facilitate the subsequent separation of the hydrogen-sensitive sensing optical fiber 1 and the coating device 2, and to facilitate the film formation of the hydrogen-sensitive material, thereby effectively solving the problem of the fragility of the hydrogen-sensitive material during film coating. For example, the hydrophobic material includes but is not limited to paraffin wax.

[0086] S2: Wrapping the grating segment 111 of the optical fiber body 11 with a layer of glass fiber.

[0087] Optionally, step S2 includes step S21 and step S22, which are specifically as follows:

[0088] Step S21 , wrapping the glass fiber layer 12 around the outer periphery of the grating segment 111 .

[0089] Step S22 , using epoxy glue 14 to fix the opposite ends of the glass fiber layer 12 and the optical fiber segment 112 .

[0090] In this embodiment, the glass fiber layer 12 and the optical fiber segment 112 are fixed by using epoxy glue 14 to improve the bonding strength between the glass fiber layer 12 and the optical fiber segment 112, thereby improving the bonding strength between the glass fiber layer 12 and the optical fiber body 11, and reducing the problem of the glass fiber layer 12 falling off the optical fiber body 11. After the hydrogen-sensitive material is subsequently coated on the glass fiber layer 12, the bonding strength between the hydrogen-sensitive material layer 13 and the optical fiber body 11 is improved.

[0091] S3: placing the grating segment 111 wrapped with glass fibers in the coating part of the coating device 2 .

[0092] Specifically, the grating segment 111 wrapped with glass fiber is disposed in the first groove 221 .

[0093] S4: The optical fiber segment 112 of the optical fiber body 11 is disposed on the optical fiber fixing portion of the coating device 2 , and the optical fiber segment 112 and the optical fiber fixing portion are bonded together using the adhesive tape 24 .

[0094] Specifically, the optical fiber fixing portion includes a first sub-groove 2311 and a second sub-groove 2312. The optical fiber segment 112 is disposed in the first sub-groove 2311, and the adhesive tape 24 adheres the optical fiber segment 112 and the groove wall of the second sub-groove 2312.

[0095] S5: coating a hydrogen-sensitive material layer 13 on the glass fiber layer 12 .

[0096] Exemplarily, before step S5, it also includes: preparing a hydrogen-sensitive material. The preparation of the hydrogen-sensitive material includes: dissolving a certain mass of platinum acetylacetonate in 10 ml of ethanol and stirring, then adding WO3 to the solution and stirring it with a magnetic stirrer (250r / min, 25°C) for 30 minutes, and when a yellow-green slurry is formed, putting the solution into a thermostat (80°C) for drying for 6 hours, and when the ethanol evaporates completely, putting the material into a high-temperature oven (300°C) for calcination for 2 hours to obtain a hydrogen-sensitive material (the mass of the hydrogen-sensitive material can be changed according to different platinum-to-dock ratios).

[0097] Exemplarily, the hydrogen sensitive material includes, but is not limited to, Pt-WO3.

[0098] Optionally, step S5 includes step S51 and step S52, which are specifically as follows:

[0099] Step S51 , coating the hydrogen sensitive material on the glass fiber layer 12 .

[0100] Step S52 , using a hot air gun to blow the hydrogen-sensitive material for a preset time to solidify the hydrogen-sensitive material to form a hydrogen-sensitive material layer 13 .

[0101] Exemplarily, the air outlet temperature of the hot air gun is 80° C., and the preset duration is 30 seconds.

[0102] The manufacturing method of the hydrogen-sensitive sensing optical fiber provided in the embodiment of the present application is adopted, by wrapping a layer of glass fiber on the outside of the grating segment 111, and then coating the glass fiber with hydrogen-sensitive material, so as to improve the coupling strength between the optical fiber body 11 and the hydrogen-sensitive material, and improve the stability of the optical fiber body 11. By coating the hydrogen-sensitive material on the coating device 2, the optical fiber body 11 is fixed to reduce the problem of inaccurate coating position caused by the movement of the optical fiber body 11, and the overflow problem during the coating of the hydrogen-sensitive material can be reduced.

[0103] Optionally, before step S1, step S6 is further included, which is specifically as follows:

[0104] Step S6, using alcohol cotton to wipe the optical fiber body 11. In this way, impurities on the surface of the optical fiber body 11 are removed.

[0105] Figure 7 A cross-sectional view of the protective structure of the hydrogen-sensitive sensing optical fiber provided in an embodiment of the present application.

[0106] Figure 8 A schematic diagram of the structure of the support assembly provided in an embodiment of the present application.

[0107] Fig. 9 A schematic diagram of the structure of the protection component provided in an embodiment of the present application.

[0108] Combination Figure 7 , Figure 8 and Fig. 9 As shown, the embodiment of the present application also provides a protective structure 3 for a hydrogen-sensitive sensing optical fiber, which is configured to allow the hydrogen-sensitive sensing optical fiber 1 to pass through and protect the hydrogen-sensitive sensing optical fiber 1; the hydrogen-sensitive sensing optical fiber 1 includes: the hydrogen-sensitive sensing optical fiber 1 provided in any of the above embodiments, or the hydrogen-sensitive sensing optical fiber 1 manufactured by the coating device 2 provided in any of the above embodiments, or the hydrogen-sensitive sensing optical fiber 1 manufactured by the manufacturing method of the hydrogen-sensitive sensing optical fiber provided in the above embodiments; the protective structure 3 for the hydrogen-sensitive sensing optical fiber includes: a support component 31 and a protective component 32. The support component 31 is configured to provide support for the hydrogen-sensitive sensing optical fiber 1. The protective component 32 is detachably connected to the support component 31. The support component 31 and the protective component 32 are sleeved on the hydrogen-sensitive sensing optical fiber 1.

[0109] The use of the hydrogen-sensitive sensing optical fiber protection structure 3 provided in the embodiment of the present application can improve the protection capability of the hydrogen-sensitive sensing optical fiber 1, reduce damage to the hydrogen-sensitive sensing optical fiber 1, and improve the stability of the optical fiber hydrogen-sensitive sensor formed by the hydrogen-sensitive sensing optical fiber protection structure 3 and the hydrogen-sensitive sensing optical fiber 1.

[0110] Optionally, combined Figure 7 and Figure 8As shown, the support assembly 31 includes: a main pipe 311 and a fiber lifting plate 312. The main pipe 311 includes a first end and a second end. The fiber segment 112 on one side of the grating segment 111 of the hydrogen-sensitive sensing optical fiber 1 is inserted into the main pipe 311. The fiber lifting plate 312 is fixedly connected to the first end of the main pipe 311. The grating segment 111 of the hydrogen-sensitive sensing optical fiber 1 is arranged on the fiber lifting plate 312.

[0111] In this embodiment, the optical fiber lifting plate 312 is provided to provide support force for the grating segment 111, thereby reducing the impact of vibration on the grating segment 111, thereby improving the stability of the grating segment 111 and reducing the impact on hydrogen detection.

[0112] Exemplarily, the optical fiber segments 112 on both sides of the grating segment 111 of the hydrogen-sensitive sensing optical fiber 1 are the first optical fiber and the second optical fiber. The first optical fiber is arranged in the main tube 311, and passes through the main tube 311 through the first end of the main tube 311. The grating segment 111 connected to the first optical fiber is arranged on the optical fiber lifting plate 312.

[0113] Optionally, the first optical fiber is fixedly connected to the optical fiber lifting plate 312 by epoxy glue 14. In this way, the influence of vibration on the hydrogen-sensitive sensing optical fiber 1 is effectively reduced, and the stability of the sensor is enhanced.

[0114] Fig.10 for Figure 8 The illustrated embodiment provides an enlarged schematic diagram of a first end of a main tube 311 and a fiber lift plate 312 in a support assembly 31 .

[0115] Optionally, the optical fiber lifting plate 312 includes: a metal plate 3121 and a bracket 3122. The metal plate 3121 is fixedly connected to the first end of the main tube 311; a fixing hole 3123 is formed on the metal plate 3121. The bracket 3122 is fixedly arranged on the hole wall of the fixing hole 3123; the bracket 3122 is configured to support the grating segment 111 of the optical fiber body 11.

[0116] In this embodiment, a bracket 3122 is provided to provide support for the grating segment 111. In addition, when the grating segment 111 is provided on the bracket 3122, the surrounding sides of the grating segment 111 are all gaps through which gas can flow, so that hydrogen can be distributed in the gaps, increasing the contact area between hydrogen and the hydrogen-sensitive material layer 13, thereby increasing the speed at which the hydrogen-sensitive material layer 13 senses hydrogen, and increasing the response speed of the hydrogen-sensitive sensing optical fiber 1.

[0117] Optionally, the first optical fiber is fixedly connected to the metal plate 3121 by epoxy glue 14 .

[0118] Exemplarily, the grating segment 111 is disposed on a bracket 3122 .

[0119] For example, the metal plate 3121 has a length of 2.5 cm, a width of 0.6 cm, and a thickness of 1.5 mm. The fixing hole 3123 has a length of 2 cm and a width of 3 mm.

[0120] Optionally, the length of the bracket 3122 is less than the length of the grating segment 111. In this way, the contact area between the hydrogen-sensitive material layer 13 outside the grating segment 111 and the air is increased, thereby providing support for the hydrogen-sensitive sensing optical fiber 1 and improving the response speed of the hydrogen-sensitive sensing optical fiber 1 to hydrogen.

[0121] Optionally, the main tube 311 is a tube structure, and the first end surface of the main tube 311 has a closed surface. A through hole 3111 is opened on the closed surface, and the through hole 3111 corresponds to one side of the metal plate 3121, and the through hole 3111 is configured to allow the hydrogen-sensitive sensing optical fiber 1 to pass through.

[0122] Optionally, the bracket 3122 is a circular ring structure, and the opposite outer side walls of the circular ring structure are fixedly connected to the opposite hole walls of the fixing hole 3123 .

[0123] Exemplarily, the metal plate 3121 includes a first end and a second end respectively located at opposite ends of the fixing hole 3123, and the first end of the metal plate 3121 is fixedly connected to the first end of the main tube 311. After the first optical fiber passes through the main tube 311 through the through hole 3111, the first optical fiber is laid on the first end of the metal plate 3121. The grating segment 111 is arranged on the bracket 3122, and the hydrogen-sensitive material layer 13 on the outside of the grating segment 111 and the bracket 3122 are fixed by epoxy glue 14. The second optical fiber is laid on the second end of the metal plate 3121.

[0124] Optionally, combined Fig.10 As shown, the metal plate 3121 also includes an optical fiber fixing groove 3124. The optical fiber fixing groove 3124 is located at the first end of the metal plate 3121, and the first optical fiber passes through the through hole 3111 and then passes through the main tube 311 and is arranged in the optical fiber fixing groove 3124, and the first optical fiber is fixedly connected to the groove wall of the optical fiber fixing groove 3124 by epoxy glue.

[0125] Fig.11 This is a schematic structural diagram of the first protective tube provided in an embodiment of the present application.

[0126] Fig.12 This is a schematic diagram of the structure of the second protective tube provided in an embodiment of the present application.

[0127] Optionally, combined Figure 7 , Fig.11 and Fig.12As shown, the support assembly 31 includes a first connection portion 313 and a second connection portion 314 arranged in sequence. The protection assembly 32 includes: a first protection tube 321 and a second protection tube 322. The first protection tube 321 is located in the second protection tube 322. A third connection portion 323 is provided at one end of the first protection tube 321, and the third connection portion 323 and the first connection portion 313 are detachably connected. A fourth connection portion 324 is provided at one end of the second protection tube 322, and the fourth connection portion 324 and the second connection portion 314 are detachably connected.

[0128] In this embodiment, by providing the first connection part 313, the second connection part 314, the third connection part 323 and the fourth connection part 324, the protective component 32 is detachably connected to the support component 31, so as to facilitate the maintenance of the support component 31. The hydrogen-sensitive sensing optical fiber 1 is protected by the first protective tube 321 and the second protective tube 322, so as to improve the protection capability of the hydrogen-sensitive sensing optical fiber 1 and improve the stability of the optical fiber hydrogen sensor 4.

[0129] Optionally, when the hydrogen-sensitive sensing optical fiber 1 is passed through the supporting assembly 31 , the hydrogen-sensitive sensing optical fiber 1 is passed through the first protective tube 321 .

[0130] Exemplarily, when the first protection tube 321 is connected to the support assembly 31 , the fiber lifting plate 312 is located inside the first protection tube 321 .

[0131] Optionally, the third connection portion 323 and the first connection portion 313 are detachably connected via a threaded structure.

[0132] Optionally, the fourth connection portion 324 and the second connection portion 314 are detachably connected via a threaded structure.

[0133] Optionally, combined Figure 7 , Figure 8 , Fig.11 and Fig.12 As shown, the first connection part 313 includes: a first thread. The second connection part 314 includes: a second thread. The diameter of the first thread is smaller than the diameter of the second thread. The third connection part 323 includes: a third thread. The fourth connection part 324 includes: a fourth thread. The diameter of the third thread is smaller than the diameter of the fourth thread. The first thread and the third thread are detachably connected. The second thread and the fourth thread are detachably connected.

[0134] Exemplarily, the main pipe 311 includes a first connection section and a second connection section, a first thread is provided on the outer pipe wall of the first connection section, a second thread is provided on the outer pipe wall of the second connection section, and the pipe diameter of the first connection section is smaller than the pipe diameter of the second connection section. A third thread is provided on the inner pipe wall at one end of the first protective pipe 321, and a fourth thread is provided on the inner pipe wall at one end of the second protective pipe 322.

[0135] Optionally, the tube wall of the first protection tube 321 has a plurality of first vent holes arranged at intervals, so as to ensure that air can flow in the first protection tube 321 to achieve hydrogen detection.

[0136] Exemplarily, the first protection tube 321 is made by powder metallurgy process, and the first protection tube 321 made by this process has the characteristics of being dense and porous, so that a plurality of first vents are formed on the tube wall of the first protection tube 321. In addition, the first protection tube 321 made by this process has high hardness and high strength, which can protect the hydrogen-sensitive sensing optical fiber 1 without affecting the inflow and outflow of air.

[0137] Optionally, combined Fig.12 As shown, the wall of the second protection tube 322 has a plurality of second vents 3221 arranged at intervals, so as to ensure that air can flow in the second protection tube 322, and further ensure that air can flow in the first protection tube 321, so as to realize the detection of hydrogen.

[0138] Exemplarily, the second vent hole 3221 is a circular hole. The second protection tube 322 is made of copper.

[0139] For example, the first protection tube 321 has an inner diameter of 1 cm, a wall thickness of 1.5 mm, and a tube length of 3.25 cm. The second protection tube 322 has an inner diameter of 1.6 mm and a tube length of 4 cm.

[0140] Fig.13 This is the optical fiber hydrogen sensor 4 provided in the embodiment of the present application.

[0141] Combination Fig.12 As shown, the embodiment of the present application also provides an optical fiber hydrogen sensor 4, comprising: a protective structure 3 of a hydrogen-sensitive sensing optical fiber as provided in any of the above embodiments and a hydrogen-sensitive sensing optical fiber 1. The hydrogen-sensitive sensing optical fiber 1 is passed through the protective structure 3 of the hydrogen-sensitive sensing optical fiber; the hydrogen-sensitive sensing optical fiber 1 comprises the hydrogen-sensitive sensing optical fiber 1 as provided in any of the above embodiments, or the hydrogen-sensitive sensing optical fiber 1 manufactured by the coating device 2 as provided in any of the above embodiments, or the hydrogen-sensitive sensing optical fiber 1 manufactured by the manufacturing method of the hydrogen-sensitive sensing optical fiber as provided in the above embodiments.

[0142] The optical fiber hydrogen sensor 4 provided in the embodiment of the present application is adopted, and the hydrogen-sensitive sensing optical fiber 1 adopted in the embodiment of the present application is adopted to improve the response speed of the optical fiber hydrogen sensor 4 to hydrogen detection, and reduce the problem of easy detachment of the hydrogen-sensitive material layer 13. In addition, the hydrogen-sensitive sensing optical fiber 1 is protected by using the protective structure 3 of the hydrogen-sensitive sensing optical fiber, and the stability of the optical fiber hydrogen sensor 4 is improved.

[0143] Specifically, due to the first vent hole of the first protection tube 321 and the second vent hole 3221 of the second protection tube 322 , the long-term reliability of the optical fiber hydrogen sensor 4 is ensured without affecting the performance of the optical fiber hydrogen sensor 4 .

[0144] For example, when installing the optical fiber hydrogen sensor 4, the hydrogen-sensitive sensing optical fiber 1 is first inserted into the support assembly 31, the hydrogen-sensitive material layer 13 outside the grating segment 111 of the hydrogen-sensitive sensing optical fiber 1 is fixed to the support assembly 31, and then the protective assembly 32 is detachably connected to the support assembly 31 to complete the installation. Specifically, the hydrogen-sensitive material layer 13 is fixedly connected to the bracket 3122 by epoxy glue 14.

[0145] Fig.14 This is the optical fiber hydrogen sensing system 5 provided in the embodiment of the present application.

[0146] Combination Fig.14 As shown, an embodiment of the present application provides a fiber optic hydrogen sensing system 5, comprising: a fiber optic hydrogen sensor 4, a fiber optic demodulator 51 and an electronic device 52 as provided in the above embodiment. The output end of the hydrogen-sensitive sensing optical fiber 1 of the fiber optic hydrogen sensor 4 is connected to the fiber optic demodulator 51. The fiber optic demodulator 51 and the electronic device 52 are communicatively connected. The fiber optic demodulator 51 is configured to obtain the optical signal output by the fiber optic hydrogen sensor 4 and convert it into an electrical signal and output it to the electronic device 52. The electronic device 52 is configured to demodulate the electrical signal to determine the hydrogen concentration.

[0147] The optical fiber hydrogen sensing system 5 provided in the embodiment of the present application is used to detect the concentration of hydrogen using the hydrogen-sensitive sensing optical fiber 1, and the optical fiber demodulator 51 is used to convert the optical signal into an electrical signal, and then the hydrogen concentration is determined by demodulating the electrical signal through the electronic device 52. Based on the hydrogen-sensitive sensing optical fiber 1 with fast response capability and high stability, the stability of the optical fiber hydrogen sensor 4 is improved.

[0148] Exemplarily, the electronic device 52 includes, but is not limited to, a computer 521, a tablet computer 521 (not shown in the figure), a mobile phone 522 and a portable wearable device (not shown in the figure), which is not limited in the embodiments of the present application.

[0149] It should be noted that those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope of the present application is indicated by the claims.

[0150] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A hydrogen-sensitive sensing optical fiber, characterized in that: include: An optical fiber body (11), comprising a grating segment (111) and an optical fiber segment (112); A glass fiber layer (12), wherein the glass fiber layer (12) is wrapped around the grating segment (111), and the glass fiber layer (12) is fixedly connected to the optical fiber segment (112); The hydrogen-sensitive material layer (13) is coated on the glass fiber layer (12).

2. The hydrogen-sensitive sensing optical fiber according to claim 1, characterized in that: The glass fiber layer (12) and the optical fiber segment (112) are bonded together by epoxy glue (14).

3. A coating device, characterized in that: The coating device (2) is used to produce the hydrogen-sensitive sensing optical fiber (1) as claimed in claim 1 or 2; the coating device (2) comprises: substrate(21); A coating portion, disposed on the substrate (21); An optical fiber fixing portion, disposed on the substrate (21); The coating portion is used to arrange the grating segment (111) wrapped with the glass fiber layer (12); The optical fiber fixing portion is used to set the optical fiber segment (112).

4. The coating device according to claim 3, characterized in that: The coating part comprises: A first groove (221); The depth of the first groove (221) is H1, the outer diameter of the grating segment (111) is D1, and the thickness of the glass fiber layer (12) is L; H1>D1+L; And / or, the optical fiber fixing part comprises: A second groove (231); The depth of the second groove (231) is H2, and the outer diameter of the optical fiber segment (112) is D2; H2≥D2.

5. The coating device according to claim 4, characterized in that: The second groove (231) comprises: A first sub-groove (2311), wherein the first sub-groove (2311) is used to place the optical fiber segment (112); a second sub-groove (2312), wherein the second sub-groove (2312) is disposed on both sides of the first sub-groove (2311), and the depth of the second sub-groove (2312) is less than the depth of the first sub-groove (2311); Wherein, an adhesive tape (24) is used to bond the groove wall of the second sub-groove (2312) and the optical fiber segment (112) to fix the optical fiber segment (112).

6. A method for manufacturing a hydrogen-sensitive sensing optical fiber, characterized in that: Used to manufacture the hydrogen-sensitive sensing optical fiber (1) as claimed in claim 1 or 2, the manufacturing method comprising: S1: applying a hydrophobic material to a coating portion of a coating device (2); S2: wrapping a layer of glass fiber around the grating segment (111) of the optical fiber body (11); S3: placing the grating segment (111) wrapped with the glass fiber on the coating part of the coating device (2); S4: placing the optical fiber segment (112) of the optical fiber body (11) on the optical fiber fixing portion of the coating device (2), and using an adhesive tape (24) to bond the optical fiber segment (112) and the optical fiber fixing portion; S5: coating a hydrogen-sensitive material layer (13) on the glass fiber layer (12).

7. A protective structure for a hydrogen-sensitive sensing optical fiber, characterized in that: The protective structure (3) of the hydrogen-sensitive sensing optical fiber is configured to allow the hydrogen-sensitive sensing optical fiber (1) to pass through and protect the hydrogen-sensitive sensing optical fiber (1); The hydrogen-sensitive sensing optical fiber (1) comprises: the hydrogen-sensitive sensing optical fiber (1) as claimed in claim 1 or 2, or the hydrogen-sensitive sensing optical fiber (1) manufactured by the coating device (2) as claimed in any one of claims 3 to 5, or the hydrogen-sensitive sensing optical fiber (1) manufactured by the method for manufacturing a hydrogen-sensitive sensing optical fiber as claimed in claim 6; The protective structure (3) of the hydrogen-sensitive sensing optical fiber comprises: A support assembly (31), wherein the support assembly (31) is configured to provide support for the hydrogen-sensitive sensing optical fiber (1); A protection component (32) detachably connected to the support component (31); The supporting component (31) and the protecting component (32) are sleeved on the hydrogen-sensitive sensing optical fiber (1).

8. The protective structure of hydrogen-sensitive sensing optical fiber according to claim 7, characterized in that: The support assembly (31) comprises: A main pipe (311) comprising a first end and a second end; an optical fiber segment (112) on one side of the grating segment (111) of the hydrogen-sensitive sensing optical fiber (1) is inserted into the main pipe (311); An optical fiber lifting plate (312) is fixedly connected to the first end of the main pipe (311); and the grating segment (111) of the hydrogen-sensitive sensing optical fiber (1) is arranged on the optical fiber lifting plate (312).

9. The protective structure of the hydrogen-sensitive sensing optical fiber according to claim 8, characterized in that: The optical fiber lifting plate (312) comprises: a metal plate (3121), the metal plate (3121) being fixedly connected to the first end of the main pipe (311); a fixing hole (3123) being provided on the metal plate (3121); The bracket (3122) is fixedly arranged on the hole wall of the fixing hole (3123); the bracket (3122) is configured to support the grating segment (111) of the optical fiber body (11).

10. An optical fiber hydrogen sensor, characterized in that: include: The protective structure (3) of the hydrogen-sensitive sensing optical fiber according to any one of claims 7 to 9; A hydrogen-sensitive sensing optical fiber (1), wherein the hydrogen-sensitive sensing optical fiber (1) is passed through a protective structure (3) of the hydrogen-sensitive sensing optical fiber; the hydrogen-sensitive sensing optical fiber (1) comprises the hydrogen-sensitive sensing optical fiber (1) as described in claim 1 or 2, or the hydrogen-sensitive sensing optical fiber (1) manufactured by the coating device (2) as described in any one of claims 3 to 5, or the hydrogen-sensitive sensing optical fiber (1) manufactured by the method for manufacturing a hydrogen-sensitive sensing optical fiber as described in claim 6.

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