CN205656120U - Optical -fiber hydrogen sensor - Google Patents
Optical -fiber hydrogen sensor Download PDFInfo
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- CN205656120U CN205656120U CN201521143688.5U CN201521143688U CN205656120U CN 205656120 U CN205656120 U CN 205656120U CN 201521143688 U CN201521143688 U CN 201521143688U CN 205656120 U CN205656120 U CN 205656120U
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Abstract
The utility model provides an optical -fiber hydrogen sensor. It is with single mode fiber and the direct butt fusion of capillary, to packing the polymer in the capillary, retain certain air gap at the weld and constitute the fabry the perot interferometer, do you carry platinum catalyst (Pt at capillary outer wall coating tungstic acid loadedWO3, ) powder. Utilize H2 and O2 at pt exothermal reaction takes place under the catalysis of loadedWO3 powder to and the great thermal expansion coefficient of polymer, realize that hydrogen concentration's high sensitivity measures.
Description
Technical field
This utility model relates to a kind of fibre-optical sensing device detecting density of hydrogen.
Background technology
The features such as hydrogen is abundant because of its burning, easy preparation, become a kind of well received clean energy resource, are applied to the field such as space flight, generating.Meanwhile, it has again wider explosion limit (4%-75% volume ratio), must pay close attention to its concentration change during use.Therefore, hydrogen leak detection or the detection of high-precision density of hydrogen are particularly important.
Fibre Optical Sensor has electromagnetism interference and is easy to the features such as remote remote sensing, is especially not related to any naked light, the most safe and reliable, is widely used in various inflammable and explosive occasion.U.S. Sandia National Laboratory Butler in 1984 and professor Ginley study the quick sensing technology of fiber optic hydrogen first, the unit such as the University of New South Wales of US National Aeronautics and Space Administration, Boeing, University of Maryland, DCH Technologies, University of Washington, University of Toronto, signal and the instrument treatment of laboratory of France and Australia has carried out the research of technique in succession subsequently, and multiple Optical Fider Hybrogen Sensor is designed and develops.As arisen at the historic moment based on various Fibre Optical Sensors such as Fiber Bragg Grating FBG, fibre optic interferometer, surface plasma structure, and optical fiber evanescent field structures.In these sensors, the overwhelming majority is to apply the quick material of hydrogen at optical fiber surface, as Butler proposes to constitute microlens type hydrogen gas sensor at fiber end face one layer of palladium film of plating or multilamellar palladium with silicon oxide film；The laser that Garcia and Mandelis proposes to send semiconductor laser produces two-beam ripple by beam splitter and is radiated in airflow chamber the hydrogen sensitive face being coated with palladium film respectively and is coated with on the reference pole plate of aluminum film, realize detecting density of hydrogen by comparing the final light intensity of two-beam, the method increase adaptability and the measuring accuracy of sensors towards ambient, etc..But, these sensors are limited to the faint elasto-optical effect of optical fiber itself or the insensitive characteristic of refractive index, and the sensitivity causing its hydrogen to sense is the highest, will be typically less than 5nm/% (v/v).The Fibre Optical Sensor of surface plasma structure has higher sensitivity, however it is necessary that and accurately controls coating film thickness (typically nanometer scale), and therefore its preparation is more complicated, and it uses by a definite limitation.
Tungstic anhydride. platinum catalyst (Pt-loaded WO3) there is the quick characteristic of good hydrogen, receive significant attention in recent years and study.As Ying Wang proposes by applying Pt-loaded WO on the photonic crystal fiber interferometer surface of selective filling3Powder, utilizes the heat effect of the quick powder of hydrogen and the higher temperature sensitive properties of fibre optic interferometer it is achieved thereby that the high-sensitivity detection of hydrogen.But its shortcoming is to need to be applied to expensive photonic crystal fiber, and its selective filling needs to be applied to femto-second laser, prepares more complicated, limit the extensive application of this sensor.
Summary of the invention
For improving the sensitivity of Optical Fider Hybrogen Sensor, and simplifying its Making programme and reduce preparation cost, the utility model proposes a kind of new optical fiber hydrogen sensing arrangement, single-mode fiber is applied Pt-loaded WO with side by this structure3The capillary tube of powder and filled polymer is connected, and retains certain the air gap in junction and constitutes Fabry-Perot interferometer, thus reaches the purpose of the highly sensitive sensing to density of hydrogen.
This utility model be the technical scheme is that directly fused with single-mode fiber for a little bodded tubule, filled polymer (its main component includes unsaturated polyester (UP) or acrylate, reactive diluent and light trigger etc.) in capillary tube, between the welding interface of polymer and single-mode fiber and capillary tube, form a air gap, then apply Pt-loaded WO at capillary tube outer wall3Powder.Further, single-mode fiber used is communication single-mode fiber, and its cladding diameter is 125 microns.Capillary tube used is quartz capillary, and its a length of 100-1000 micron, internal diameter is 30-100 micron, and external diameter is 120-180 micron.The polymer filled in capillary tube has the characteristic of ultraviolet lighting solidification, the i.e. polymer of liquid and can solidify after ultraviolet light irradiates.The Pt-loaded WO of capillary tube outer wall coating3The thickness of powder is 10-50 micron.In capillary tube after filled polymer, the weld at single-mode fiber and capillary tube retains a air gap, its a length of 10-50 micron.
Specific works principle of the present utility model is: forms a air gap between polymer and the welding interface of single-mode fiber and capillary tube filled in capillary tube, constitutes a Fabry-Perot interferometer.When sensor contacts is to being mixed with H2Air time, the O in air2With H2At Pt-loaded WO3Exothermic reaction occurring under powder effect and causes the rising of local temperature, this chemical reaction process is represented by:
The rising of temperature causes the expanded by heating of capillary tube interpolymer, and then causes the change of Fabry-Perot interferometer chamber length, further results in the reflected spectrum wavelengths drift of this interferometer.There is positively related relation in the size of this reflected spectrum wavelengths drift value and the size of density of hydrogen.By detection wavelength shift, thus realize the real-time measurement of density of hydrogen.Owing to the thermal coefficient of expansion of polymer is much larger than single-mode fiber and the thermal coefficient of expansion of quartz capillary, therefore, this sensor has high temperature control, again due to H2At Pt-loaded WO3With O in air under the catalysis of powder2Reaction produces heat effect, it is achieved thereby that the high sensitivity density of hydrogen of this sensor is measured.
The beneficial effects of the utility model are:
1) sensor preparation is simple, and low cost only need to be by directly fused to single-mode fiber and capillary tube, then injection of polymer in capillary tube, and applies Pt-loaded WO at its outer wall3Powder.
2) size sensor is little, and total length is less than 1 millimeter, convenient in small space use.
3) ingenious H is utilized2With O2At Pt-loaded WO3Exothermic reaction, and the thermal coefficient of expansion that polymer is bigger is there is, it is achieved that the high-sensitivity measurement of density of hydrogen under powder catalytic.
Accompanying drawing explanation
With embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is structural representation of the present utility model.In figure:
(1) single-mode fiber, (2) capillary tube, (3) polymer, (4) Tungstic anhydride. platinum catalyst (Pt-loaded WO3) powder.
Detailed description of the invention
Such as Fig. 1, the step preparing sensor is: the first step, by directly fused to communication single-mode fiber and capillary tube；Second step, injects liquid polymer in capillary tube, is subsequently placed under ultra violet lamp and is solidified by polymer；3rd step, the outer wall at capillary tube applies Pt-loaded WO3Powder.It is characterized by: the communication single-mode fiber cladding diameter of utilization is 125 microns, and capillary tube used is quartz capillary, its a length of 100-1000 micron, internal diameter is 30-100 micron, and external diameter is 120-180 micron.The polymer filled in capillary tube has the characteristic of ultraviolet lighting solidification, the i.e. polymer of liquid and can solidify after ultraviolet light irradiates.The thickness of the Tungstic anhydride. platinum catalyst powder of capillary sense outer wall coating is 10-50 micron.In capillary tube after filled polymer, the weld at single-mode fiber and capillary tube forms a air gap, its a length of 10-50 micron, constitutes a Fabry-Perot interferometer.
During use, the single-mode fiber input of sensor is connected with the outfan of fiber optical circulator, and two inputs of this circulator are connected with wideband light source and spectrogrph respectively.When sensor contacts is to being mixed with H2Air time, the O in air2With H2At Pt-loaded WO3There is exothermic reaction under powder effect and cause the rising of local temperature.The rising of temperature causes the expanded by heating of capillary tube interpolymer, and then causes the change of Fabry-Perot interferometer chamber length, further results in the reflected spectrum wavelengths drift of this interferometer.There is positively related relation in the size of this reflected spectrum wavelengths drift value and the size of density of hydrogen.By detection wavelength shift, thus realize the real-time measurement of density of hydrogen.
Claims (4)
1. an Optical Fider Hybrogen Sensor, it is characterised in that: this sensor includes single-mode fiber (1), capillary tube (2), is filled with polymer (3), and capillary tube outer wall coating Pt-loaded WO in capillary tube3Powder (4).
Optical Fider Hybrogen Sensor the most according to claim 1, it is characterised in that: single-mode fiber (1) is directly fused with capillary tube (2), and single-mode fiber (1) is communication single-mode fiber, and its cladding diameter is 125 microns.
Optical Fider Hybrogen Sensor the most according to claim 1, it is characterized in that: a length of 100-1000 micron of capillary tube (2), internal diameter is 30-100 micron, external diameter is 120-180 micron, the polymer (3) filled in it has the characteristic of ultraviolet lighting solidification, and the Pt-loaded WO of capillary tube outer wall coating3The thickness of powder (4) is about 10-50 micron.
Optical Fider Hybrogen Sensor the most according to claim 1, it is characterized in that: forming a air gap between polymer and the welding interface of single-mode fiber (1) and capillary tube (2) filled in capillary tube (2), this air gap length is 10-50 micron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521143688.5U CN205656120U (en) | 2015-12-31 | 2015-12-31 | Optical -fiber hydrogen sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521143688.5U CN205656120U (en) | 2015-12-31 | 2015-12-31 | Optical -fiber hydrogen sensor |
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| CN205656120U true CN205656120U (en) | 2016-10-19 |
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| CN201521143688.5U Expired - Fee Related CN205656120U (en) | 2015-12-31 | 2015-12-31 | Optical -fiber hydrogen sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152220A (en) * | 2018-01-05 | 2018-06-12 | 中国计量大学 | The embedded Optical Fider Hybrogen Sensor of sensitive membrane based on double C-type micro-cavities |
| WO2019085165A1 (en) * | 2017-11-02 | 2019-05-09 | 中山大学 | Hydrogen sensor and preparation method therefor, and method for implementing hydrogen detection |
| CN113375844A (en) * | 2021-05-28 | 2021-09-10 | 北京航空航天大学 | FP pressure sensor based on low-temperature coupling effect of photonic crystal fiber |
-
2015
- 2015-12-31 CN CN201521143688.5U patent/CN205656120U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019085165A1 (en) * | 2017-11-02 | 2019-05-09 | 中山大学 | Hydrogen sensor and preparation method therefor, and method for implementing hydrogen detection |
| US11150230B2 (en) | 2017-11-02 | 2021-10-19 | Sun Yat-Sen University | Hydrogen sensor and preparation method therefor, and method for implementing hydrogen detection |
| CN108152220A (en) * | 2018-01-05 | 2018-06-12 | 中国计量大学 | The embedded Optical Fider Hybrogen Sensor of sensitive membrane based on double C-type micro-cavities |
| CN108152220B (en) * | 2018-01-05 | 2023-10-13 | 中国计量大学 | Sensitive film embedded optical fiber hydrogen sensor based on double C-shaped miniature cavity |
| CN113375844A (en) * | 2021-05-28 | 2021-09-10 | 北京航空航天大学 | FP pressure sensor based on low-temperature coupling effect of photonic crystal fiber |
| CN113375844B (en) * | 2021-05-28 | 2023-06-16 | 北京航空航天大学 | FP pressure sensor based on photonic crystal fiber low-temperature coupling effect |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161019 Termination date: 20171231 |
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| CF01 | Termination of patent right due to non-payment of annual fee |