CN216449432U - Interference type optical fiber hydrogen sensor based on vernier effect - Google Patents
Interference type optical fiber hydrogen sensor based on vernier effect Download PDFInfo
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- CN216449432U CN216449432U CN202122635264.2U CN202122635264U CN216449432U CN 216449432 U CN216449432 U CN 216449432U CN 202122635264 U CN202122635264 U CN 202122635264U CN 216449432 U CN216449432 U CN 216449432U
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Abstract
The utility model discloses an interference type hydrogen sensor based on vernier effect, which consists of a single-mode optical fiber, a hollow optical fiber, a hydrogen sensitive film and UV curing glue. The single mode fiber, the UV curing adhesive, the single mode fiber, the hollow fiber and the single mode fiber are sequentially connected, the UV curing adhesive connecting the two sections of single mode fibers is irradiated and cured by an ultraviolet lamp to form an FPI, the single mode fiber and the hollow fiber are welded to form another FPI, and the single mode fiber and the hollow fiber are cascaded to form the FPI with the vernier effect. The hydrogen sensitive film coated on the side surface of the UV curing adhesive senses the change of the hydrogen concentration, the hydrogen concentration rises, and the temperature of the hydrogen sensitive film rises, so that the refractive index of the UV curing adhesive is changed, resonance spectrum drift is caused, and the change of the hydrogen concentration can be demodulated by recording the reflection spectrum drift of the sensor through the optical fiber spectrometer. The utility model has the advantages of high sensitivity, accurate measurement, small structure and the like.
Description
Technical Field
The utility model belongs to the technical field of optical fiber sensing, and particularly relates to an interference type optical fiber hydrogen sensor based on a vernier effect.
Background
Along with the growing environmental problems associated with the use of fossil fuels, research on the way to explore new clean energy sources has been actively conducted by mankind. The hydrogen is used as clean energy with high efficiency, no pollution and sufficient resources, and plays an important role in solving the energy crisis. In recent years, hydrogen has been widely used in the fields of aerospace engineering, electric power, mining industry, automobiles, and the like. However, hydrogen is a flammable and explosive gas, has a high diffusion coefficient, a high combustion heat, a low ignition energy, and a wide explosion volume fraction range, and causes a great risk if leakage occurs in a use environment, so that the concentration of hydrogen needs to be monitored in time in any link of production, storage, and transportation of hydrogen.
In recent years, a great deal of research and development are carried out on high-performance hydrogen sensors, wherein the optical fiber hydrogen sensor becomes one of the hot spots of domestic and foreign research due to the advantages of being safe in nature, being capable of being used for remote sensing, resisting electromagnetic interference and the like. According to different measurement principles, fiber grating type, microlens type, evanescent field type and interference type fiber hydrogen sensors are proposed and demonstrated. The fiber grating type forms a fiber grating by irradiating an optical fiber with high-intensity ultraviolet rays, a layer of hydrogen-sensitive palladium film is plated on the surface of a signal arm, the hydrogen-sensitive palladium film is contacted with hydrogen to cause the refractive index change of the grating of the optical fiber, so that the light intensity is also changed, and the use range of the fiber grating is limited because a wavelength demodulation instrument is expensive. The end face of the optical fiber is plated with a layer of compact hydrogen-sensitive palladium film in a micro-lens mode, incident light emitted by an LED light source is reflected by the hydrogen-sensitive palladium film and then outputs reflected light with changed light intensity, the reflected light enters the coupler through the optical fiber, meanwhile, the hydrogen concentration is changed, so that the volume of the hydrogen-sensitive film is changed, the light intensity of the reflected light is changed, the change of a weak electric signal detected by a photoelectric detector reflects the hydrogen concentration to be detected, the manufacturing process of the micro-lens type optical fiber hydrogen sensor is simple, and the micro-lens type optical fiber hydrogen sensor is only suitable for point type measurement. The evanescent field type is that a hydrogen-sensitive palladium film is plated on a fiber core, the volume of the hydrogen-sensitive palladium film is increased after the hydrogen-sensitive palladium film is contacted with hydrogen, so that the refractive index of an optical fiber is changed, the intensity of light transmitted along the fiber core is exponentially attenuated, an optical signal is converted into an electric signal through a photoelectric detector, and the hydrogen concentration value can be demodulated by detecting the change of a weak electric signal. The same evanescent field sensors are manufactured on one optical fiber, hydrogen can be measured in a distributed mode in space, the measurement method can improve the precision of space measurement and reduce the response time, but the space measurement sensor requires a harsh processing and manufacturing process and high manufacturing cost, so that the space measurement sensor is still in a further research stage of a laboratory at present, and no corresponding product appears. The interference type optical fiber hydrogen sensor has high measurement precision which can reach 0.02-2000 ppm. The number level, the response speed and the repeatability are good, and the interference type optical fiber hydrogen sensor is widely researched and practiced due to the advantages of flexible and simple structure, high sensitivity, easiness in manufacturing and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides an interference type optical fiber hydrogen sensor based on a vernier effect to sense the change of hydrogen concentration.
The technical scheme adopted by the utility model is as follows: an interference type optical fiber hydrogen sensor based on vernier effect comprises a single mode optical fiber, a hollow optical fiber, a hydrogen sensitive film and UV curing glue; the method is characterized in that: the single-mode fibers at two ends are connected by cured UV curing adhesive, and the other ends of the single-mode fibers are sequentially connected with the hollow-core fiber and the single-mode fiber respectively. The inner diameter of the hollow-core optical fiber is 50-80 μm, the length of the hollow-core optical fiber is 145-155 μm, the UV curing adhesive is irradiated by an ultraviolet lamp to be cured, the cured length is 75-85 μm, and the cured refractive index range is 1.52-1.55; the hydrogen sensitive film coated on the outer side of the UV curing adhesive is Pt-WO3The film has a thickness of 3-5 μm and a length of 3-5cm of a single-mode fiber connected to the hollow-core fiber. Wherein the single mode optical fiber is G652D type; the end face of the single-mode optical fiber at the tail end of the hollow optical fiber is ground to 45 degrees, so that interference between end face reflection and other reflected light is prevented.
The utility model has the beneficial effects that:
1. the hydrogen sensitive material coated on the side surface of the UV curing adhesive used by the sensor has the characteristics of quick response time, reusability and the like.
2. The sensor has the advantages of high sensitivity, compact structure, simple preparation and the like.
Drawings
The utility model is further described with reference to the accompanying drawings and the detailed description.
FIG. 1 is a schematic diagram of an interferometric fiber sensor based on vernier effect.
In the figure: 1. G652D type single mode optical fiber, 2 UV curing glue, 3, Pt-WO3Hydrogen sensitive material, single mode fiber of type 4, G652D, hollow core fiber 5, single mode fiber of type 6, G652D
Detailed Description
The structure of the utility model is shown schematically; the method comprises the following specific steps: firstly, taking two sections of G652D mode single mode fiber 1 and single mode fiber 4, stripping coating layers, and flattening end faces; and secondly, aligning one end face of the single-mode fiber 1 with one end face of the single-mode fiber 4 respectively, and connecting the two end faces by using UV curing adhesive 2. And thirdly, irradiating the UV curing adhesive 2 between the single-mode optical fiber 1 and the single-mode optical fiber 4 for 30 minutes under an ultraviolet lamp to completely cure the UV curing adhesive and form a solid sensing cavity. Fourthly, intercepting the single mode fiber 4 with the length of 3-5 cm; fifthly, taking a section of hollow-core optical fiber 5 and the G652D single-mode optical fiber 6, using an optical fiber fusion splicer to fuse one end of the hollow-core optical fiber 5 and the single-mode optical fiber 6 by selecting proper discharge amount, and then selecting proper discharge parameters to fuse the other end face of the hollow-core optical fiber 5 and the single-mode optical fiber 4 to form an air sensing cavity; and sixthly, grinding the other end of the single-mode fiber 6 into a cross section with an angle of 45 degrees to prevent end face reflection and influence on the structure spectrum. Seventhly, coating a layer of Pt-WO with the diameter of 3-5 mu m on the surface of the UV curing glue 23And the hydrogen sensitive film 3 is used for sensing the change of the hydrogen concentration of the external environment. The inner diameter of the hollow-core optical fiber 5 is 50-80 μm, the length is 145-155 μm, the length of the UV curing adhesive 2 after curing is 75-85 μm, and the refractive index range after curing is 1.52-1.55.
Claims (6)
1. An interference type optical fiber hydrogen sensor based on vernier effect comprises a single mode optical fiber, a hollow optical fiber, a hydrogen sensitive film and UV curing glue; the method is characterized in that: and the two sections of single-mode fibers are connected by UV curing adhesive in a curing manner, and the other end of each single-mode fiber is sequentially connected with the hollow fiber and the single-mode fiber respectively.
2. The interferometric fiber optic hydrogen sensor based on vernier effect as claimed in claim 1, wherein: the single-mode fiber is G652D type, the inner diameter of the hollow-core fiber is 50-80 μm, and the length of the hollow-core fiber is 145-155 μm.
3. The interferometric fiber optic hydrogen sensor based on vernier effect as claimed in claim 1, wherein: the hydrogen sensitive film is Pt-WO3A film having a thickness of 3 to 5 μm.
4. The interferometric fiber optic hydrogen sensor based on vernier effect as claimed in claim 1, wherein: the length of the single-mode optical fiber between the UV curing adhesive and the hollow optical fiber is 3-5 cm.
5. The interferometric fiber optic hydrogen sensor based on vernier effect as claimed in claim 1, wherein: the selected UV curing glue is NOA65, and the length of the UV curing glue after curing is 75-85 μm.
6. The interferometric fiber optic hydrogen sensor based on vernier effect as claimed in claim 1, wherein: the end face of the single-mode fiber at the tail end of the sensor is ground into a 45-degree angle, so that the end face reflection is prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122635264.2U CN216449432U (en) | 2021-10-29 | 2021-10-29 | Interference type optical fiber hydrogen sensor based on vernier effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122635264.2U CN216449432U (en) | 2021-10-29 | 2021-10-29 | Interference type optical fiber hydrogen sensor based on vernier effect |
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| Publication Number | Publication Date |
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| CN216449432U true CN216449432U (en) | 2022-05-06 |
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| CN202122635264.2U Active CN216449432U (en) | 2021-10-29 | 2021-10-29 | Interference type optical fiber hydrogen sensor based on vernier effect |
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2021
- 2021-10-29 CN CN202122635264.2U patent/CN216449432U/en active Active
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