CN203630041U - Micro optical fiber hydrogen sensor - Google Patents
Micro optical fiber hydrogen sensor Download PDFInfo
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- CN203630041U CN203630041U CN201320871248.6U CN201320871248U CN203630041U CN 203630041 U CN203630041 U CN 203630041U CN 201320871248 U CN201320871248 U CN 201320871248U CN 203630041 U CN203630041 U CN 203630041U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 48
- 239000001257 hydrogen Substances 0.000 title abstract description 24
- 229910052739 hydrogen Inorganic materials 0.000 title abstract description 24
- 125000004435 hydrogen atom Chemical class [H]* 0.000 title abstract description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 26
- 239000000835 fiber Substances 0.000 claims description 73
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 42
- 230000003287 optical effect Effects 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 150000002431 hydrogen Chemical class 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model relates to a micro optical fiber hydrogen sensor. The micro optical fiber hydrogen sensor comprises a broadband light source (1), a 3dB optical fiber coupler (2), a wavelength demodulation instrument (3), a monomode optical fiber (5) and a sensing head, wherein the broadband light source (1) is connected to one end of the 3dB optical fiber coupler (2); other two ports of the 3dB optical fiber coupler (2) are respectively connected to the wavelength demodulation instrument (3) and the monomode optical fiber (5); the other end of the monomode optical fiber (5) is connected with the sensing head; the sensing heat comprises the monomode optical fiber (5) and a hollow core optical fiber (4) which are welded together; one end of the hollow core optical fiber (4) is welded with the monomode optical fiber (5); the other end of the hollow core optical fiber (4) is open; the end face of one end of the open hollow core optical fiber (4) is coated with a layer of palladium film (6). The micro optical fiber hydrogen sensor has the characteristics of being simple to manufacture, convenient to use and high in sensitivity.
Description
Technical field
The utility model relates to optical fiber sensing technology, is specifically related to a kind of mini optical fibre hydrogen gas sensor based on optical fiber technology.
Background technology
Hydrogen is considered to a kind of free of contamination energy, traditional fuel shows many superiority relatively, more and more receive people's concern, and be also widely used in the industry such as aviation, chemical industry, boats and ships, but in the ordinary course of things, be solid-state hydrogen or liquid be all volatile, inflammable, explosive.Depress in room temperature and normal atmosphere, in the time that the density of hydrogen of revealing in air reaches 4%-74.2%, it is inflammable that air just becomes, thereby cause explosion danger, therefore develops one and have that essential safety is reliable, highly sensitive, hydrogen gas sensor is particularly important cheaply.
In addition, hydrogen also may cause the corrosion of metal material, also easily produces blast, the safety that jeopardizes whole product and personnel when excessive concentration.Hydrogen gas sensor mainly contains the polytypes such as semi-conductor type, electrothermic type, optical type, galvanochemistry type, and it respectively has relative merits.In some special environment, as density of hydrogen may reach in the environment of explosion limits, Optical Hydrogen gas sensor has advantages of that other sensors are incomparable: (1) security, Optical Hydrogen gas sensor is to detect with light signal, do not need heating or electric signal, avoided the possibility of blast; (2) because the common sensitivity of Optical Hydrogen gas sensor is higher, therefore be applicable to the online detection of some low concentration high precision atmosphere; (3) can realize remote monitoring, more convenient practicality; (4) can on an optical fiber, realize multiplexedly, reduce system cost; (5) volume is little, and pliability is good, can be wrapped in weapon privileged sites, or be arranged in small space.It is the accumulation in order to prevent hydrogen or the occasion that will utilize hydrogen all needs the content of hydrogen to carry out measurement and monitoring, for this reason, optic-fiber hydrogen sensor based on optical fiber technology can meet safety, real-time online detection simultaneously, not disturb the requirement of test environment, also have that volume is little, lightweight, pliability is good, optical fiber can also resist chemical and rugged environment temperature, without electromagnetic interference (EMI) etc., be suitable for long-range extensive multipoint multiplexing and detect.
Summary of the invention
The purpose of this utility model is to provide a kind of miniature Optical Fider Hybrogen Sensor, requires this Optical Fider Hybrogen Sensor to have and makes simple, the little and highly sensitive feature of volume.
The design concept of hydrogen gas sensor of the present utility model:
Fiber F-P cavity is based on two-beam interference principle in wave optics.Optical fiber Fabry-Perot sensor comes from the development of optics Fabry Parot interferometer, injects in F-P chamber when a branch of coherent light, and most of luminous energy carrys out back reflective repeatedly in chamber, forms optical resonance.Free Spectral Range (FSR) is defined as the wavelength interval of the adjacent projections window of various fibre optic interferometers, also be the important parameter of fiber F-P interferometer, for traditional fiber F-P interferometer, establish optical source wavelength λ, F-P chamber is long is L, and the phase differential that light produces at F-P intracavity reflecting is
Optical source wavelength changes the phase place causing and is changed to
Phase adjustment range is ±
, wavelength variation range
Wherein, Δ λ is FSR, and λ is operation wavelength, and n is the refractive index of medium between two F-P catoptrons, and L is its spacing distance, and the chamber of ascending the throne is long.In the time that chamber is long or refractive index changes, the wavelength that spectrum peak is corresponding also will change.
Based on above-mentioned ultimate principle, the technical scheme that the utility model technical solution problem is taked is:
A kind of mini optical fibre hydrogen gas sensor, it is characterized in that, described Optical Fider Hybrogen Sensor includes wideband light source, 3dB fiber coupler, wavelength demodulation device, single-mode fiber and sensing head, described wideband light source is connected in one end of 3dB fiber coupler, another two ports of 3dB fiber coupler connect respectively wavelength demodulation device and single-mode fiber, the other end of single-mode fiber connects sensing head, described sensing head includes the single-mode fiber and the hollow-core fiber that are welded together, one end of described hollow-core fiber and single-mode fiber welding, the other end of described hollow-core fiber is open, on the end face of open hollow-core fiber one end, be coated with one deck palladium film.
In mini optical fibre hydrogen gas sensor of the present utility model, the length of described hollow-core fiber (4) is 30 μ m～150 μ m.
In mini optical fibre hydrogen gas sensor of the present utility model, the fibre core of described hollow-core fiber (4) is that diameter is the airport of 75 μ m, and the overall diameter of hollow optic fibre (4) is 125 μ m.
In mini optical fibre hydrogen gas sensor of the present utility model, it is evaporation that Metal Palladium is coated on the upper mode that forms palladium film (6) of hollow-core fiber (4).
In mini optical fibre hydrogen gas sensor of the present utility model in the manufacturing process of sensing head, first utilize optical fiber splicer by the hollow-core fiber of several centimeter length and single-mode fiber welding, large portion hollow-core fiber is cut, by Metal Palladium evaporation in optical fiber open end, form one deck palladium film at fiber end face, form F-P chamber by single-mode fiber end face and palladium film, as hydrogen sensing head.Sensing head is connected with wavelength demodulation device with wideband light source respectively by 3dB fiber coupler, forms whole optical fiber hydrogen sensor-based system.
Use through practice, mini optical fibre hydrogen gas sensor of the present utility model has following technical characterstic:
1. due to sensor hollow core optical fiber one end of the present utility model and general single mode fiber welding, the other end is open, just can complete making by the parameter that regulates optical fiber splicer, and therefore manufacture craft is simple in structure.
2. the length approximately 30 μ m-150 μ m of sensor hollow core optical fiber of the present utility model, make the advantages such as this sensor has compact conformation, and volume is little, and cost of manufacture is low, can be widely used in various hydrogen monitorings field.
3. the palladium film in sensor of the present utility model easily reacts with hydrogen, and with the increase of extraneous density of hydrogen, Metal Palladium and hydrogen generation reversible reaction generation hydrogenation palladium, absorbed the film of hydrogen because expansion also can cause stretching effect.
Accompanying drawing explanation
Fig. 1 is the structure composition schematic diagram of mini optical fibre hydrogen gas sensor device of the present utility model.
Fig. 2 is the schematic diagram of sensing head in mini optical fibre hydrogen gas sensor device of the present utility model;
Fig. 3 is the end face structure figure of mini optical fibre hydrogen gas sensor device hollow core optical fiber of the present utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, mini optical fibre hydrogen gas sensor of the present utility model is described in further detail, understands its structure composition and working method in the hope of more cheer and bright, but can not limit protection domain of the present utility model with this.
As shown in Figure 1, mini optical fibre hydrogen gas sensor of the present utility model structurally mainly includes wideband light source 1,3dB fiber coupler 2, wavelength demodulation device 3, single-mode fiber 5 and sensing head.
Above-mentioned wideband light source 1 is connected in a port of 3dB fiber coupler 2,3dB fiber coupler 2 has three connectivity ports, two other port of 3dB fiber coupler 2 connects respectively wavelength demodulation device 3, and one end of single-mode fiber 5, and the other end of single-mode fiber 5 connects sensing head.
Shown in the structure composition diagram 2 of sensing head, sensing head includes the single-mode fiber 5 and the hollow-core fiber 4 that are welded together, one end of described hollow-core fiber 4 and single-mode fiber 5 weldings, the other end of described hollow-core fiber 4 is open, on the end face of open hollow-core fiber 4 one end, be coated with one deck palladium film 6, it is evaporation that Metal Palladium is coated on the mode that forms palladium film 6 on hollow-core fiber 4.
In order to meet functional requirement of the present utility model, the length range of selecting of above-mentioned hollow-core fiber 4 is 30 μ m～150 μ m, and the fibre core of described hollow-core fiber 4 is that diameter is the airport of 75 μ m, and the overall diameter of hollow optic fibre 4 is 125 μ m.
In a specific embodiment, long hollow-core fiber 4 end faces of 50 μ m apply palladium film 6 that one decks are made by Metal Palladium as sensing head, and the end face structure of hollow-core fiber 4 is as Fig. 3, wherein, and hollow-core fiber overall diameter 125 μ m, hollow diameter 75 μ m.
This device of mini optical fibre hydrogen gas sensor of the present utility model can be realized hydrogen detection, put forward high-precision gordian technique:
Hollow-core fiber fibre core is the airport of diameter 75 μ m, in this hollow-core fiber and single-mode fiber fusion process, and the parameter of manual adjustments heat sealing machine, hollow-core fiber one end and general single mode fiber welding, the other end is open, and evaporation layer of metal palladium material, forms a small chamber.Utilize the principle of interference of F-P, detect the variation of density of hydrogen by wavelength variations.Utilize hollow-core fiber self structure to solve the problems such as the complex manufacturing technology of general Optical Fider Hybrogen Sensor, this compact conformation, simple to operate.
When mini optical fibre hydrogen gas sensor of the present utility model uses, in the time that Metal Palladium is exposed in hydrogen, hydrogen molecule can be adsorbed in the surface of palladium, hydrogen molecule can be adsorbed in the surface of palladium, under the effect of palladium atom, hydrogen molecule can be decomposed into hydrogen atom, and hydrogen atom infiltrates into the inside of palladium metal immediately, generate hydride with palladium atomic reaction, thereby palladium is changed in nature in grating constant, conduction property, refractive index etc.The variation of grating constant must cause palladium volume to change, thereby changes the variation of the long L in chamber of F-P, thereby causes the raw drift of interference wave long hair, has realized the detection of density of hydrogen.
Claims (4)
1. a mini optical fibre hydrogen gas sensor, it is characterized in that, described Optical Fider Hybrogen Sensor includes wideband light source (1), 3dB fiber coupler (2), wavelength demodulation device (3), single-mode fiber (5) and sensing head, described wideband light source (1) is connected in one end of 3dB fiber coupler (2), another two ports of 3dB fiber coupler (2) connect respectively wavelength demodulation device (3) and single-mode fiber (5), the other end of single-mode fiber (5) connects sensing head, described sensing head includes the single-mode fiber (5) and the hollow-core fiber (4) that are welded together, one end of described hollow-core fiber (4) and single-mode fiber (5) welding, the other end of described hollow-core fiber (4) is open, on the end face of open hollow-core fiber (4) one end, be coated with one deck palladium film (6).
2. a kind of mini optical fibre hydrogen gas sensor according to claim 1, is characterized in that, the length of described hollow-core fiber (4) is 30 μ m～150 μ m.
3. a kind of mini optical fibre hydrogen gas sensor according to claim 1 and 2, is characterized in that, the fibre core of described hollow-core fiber (4) is that diameter is the airport of 75 μ m, and the overall diameter of hollow optic fibre (4) is 125 μ m.
4. a kind of mini optical fibre hydrogen gas sensor according to claim 1, is characterized in that, it is evaporation that Metal Palladium is coated on the upper mode that forms palladium film (6) of hollow-core fiber (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320871248.6U CN203630041U (en) | 2013-12-27 | 2013-12-27 | Micro optical fiber hydrogen sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320871248.6U CN203630041U (en) | 2013-12-27 | 2013-12-27 | Micro optical fiber hydrogen sensor |
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| CN203630041U true CN203630041U (en) | 2014-06-04 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728276A (en) * | 2013-12-27 | 2014-04-16 | 平湖波汇通信科技有限公司 | Micro optical fiber hydrogen sensing system |
| CN103940780A (en) * | 2014-04-21 | 2014-07-23 | 武汉纺织大学 | Optical fiber hydrogen sensor |
| CN104132914A (en) * | 2014-07-31 | 2014-11-05 | 上海理工大学 | Interferometric hydrogen sensor, preparation and use method thereof |
| CN107064066A (en) * | 2017-04-21 | 2017-08-18 | 中国计量大学 | Amplify the self-calibration technology and device of hydrogen gas sensor based on the double F P verniers of optical fiber microcavity |
| CN110470635A (en) * | 2019-08-01 | 2019-11-19 | 武汉理工大学 | A kind of hydrogen gas sensor based on multicore coupling optical fiber |
-
2013
- 2013-12-27 CN CN201320871248.6U patent/CN203630041U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728276A (en) * | 2013-12-27 | 2014-04-16 | 平湖波汇通信科技有限公司 | Micro optical fiber hydrogen sensing system |
| CN103940780A (en) * | 2014-04-21 | 2014-07-23 | 武汉纺织大学 | Optical fiber hydrogen sensor |
| CN103940780B (en) * | 2014-04-21 | 2016-07-06 | 武汉纺织大学 | Optical Fider Hybrogen Sensor and preparation method thereof |
| CN104132914A (en) * | 2014-07-31 | 2014-11-05 | 上海理工大学 | Interferometric hydrogen sensor, preparation and use method thereof |
| CN107064066A (en) * | 2017-04-21 | 2017-08-18 | 中国计量大学 | Amplify the self-calibration technology and device of hydrogen gas sensor based on the double F P verniers of optical fiber microcavity |
| CN107064066B (en) * | 2017-04-21 | 2023-06-06 | 中国计量大学 | Self-calibration method and device based on optical fiber microcavity double F-P vernier amplification hydrogen sensor |
| CN110470635A (en) * | 2019-08-01 | 2019-11-19 | 武汉理工大学 | A kind of hydrogen gas sensor based on multicore coupling optical fiber |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Tao Inventor after: Zhang Chengxian Inventor after: Liu Qin Inventor after: Xiao Kai Inventor after: Jiang Dingshan Inventor after: Li Zaihong Inventor after: Zhao Hao Inventor before: Li Tao Inventor before: Zhang Chengxian Inventor before: Liu Qin |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LI TAO ZHANG CHENGXIAN LIU QIN TO: LI TAO ZHANG CHENGXIAN LIU QIN XIAO KAI JIANG DINGSHAN LI ZAIHONG ZHAO HAO |
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| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 314299, Pinghu Jiaxing Economic Development Zone, Zhejiang Province, 988 emerging two road, the first floor of the first floor of the north side of the building Patentee after: PINGHU BOHUI COMMUNICATION TECHNOLOGY Co.,Ltd. Patentee after: SHANGHAI BANDWEAVER TECHNOLOGY Co.,Ltd. Address before: 314299, Pinghu Jiaxing Economic Development Zone, Zhejiang Province, 988 emerging two road, the first floor of the first floor of the north side of the building Patentee before: PINGHU BOHUI COMMUNICATION TECHNOLOGY Co.,Ltd. Patentee before: Shanghai Bandweaver Technologies Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 314299 North side of the first floor of No. 988 Xinxing No. 2 Road, Pinghu Economic Development Zone, Jiaxing City, Zhejiang Province Co-patentee after: Shanghai Bohui Technology Co.,Ltd. Patentee after: PINGHU BOHUI COMMUNICATION TECHNOLOGY Co.,Ltd. Address before: 314299 North side of the first floor of No. 988 Xinxing No. 2 Road, Pinghu Economic Development Zone, Jiaxing City, Zhejiang Province Co-patentee before: SHANGHAI BANDWEAVER TECHNOLOGY Co.,Ltd. Patentee before: PINGHU BOHUI COMMUNICATION TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140604 |
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