CN103645145A - Optical fiber hydrogen sensor - Google Patents
Optical fiber hydrogen sensor Download PDFInfo
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- CN103645145A CN103645145A CN201310717582.0A CN201310717582A CN103645145A CN 103645145 A CN103645145 A CN 103645145A CN 201310717582 A CN201310717582 A CN 201310717582A CN 103645145 A CN103645145 A CN 103645145A
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- hydrogen
- optical fiber
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Abstract
The invention discloses an optical fiber hydrogen sensor which is characterized by consisting of an LED (light emitting diode) light source (1), a 2*1 3dB coupler (2), a WO3/Pt-film-coated FBG (fiber bragg grating) (3), a spectrum analyzer (4) and a gas chamber (5), wherein two ports in one side of the 3dB coupler (2) are respectively connected with the LED light source (1) and the spectrum analyzer (4); the other end of the 3dB coupler (2) is connected with the WO3/Pt-film-coated FBG (3); the O3/Pt-film-coated FBG (3) is put in the gas chamber (5). The optical fiber hydrogen sensor has high precision and repeatability, can monitor the leakage of hydrogen with any concentration and can be used for measuring the low-concentration hydrogen in air.
Description
Technical field
The invention provides a kind of Optical Fider Hybrogen Sensor, belong to technical field of optical fiber sensing.
Background technology
Hydrogen is a kind of love knot energy, be a kind of important chemical raw material, and it has been widely used in many industrial circles now.Because Optical Fider Hybrogen Sensor has some extraordinary features, such as: intrinsic security, volume is little, anti-electromagnetic interference (EMI).So it has become a Scientific Research Problem, wherein most typical is exactly FBG hydrogen gas sensor.Because its wavelength has the ability that can double, so can realize distributed measurement.Another advantage is exactly that FBG is easy to realize temperature compensation, so just can avoid light source density to change the impact bringing, thereby improves sensing accuracy.
The response time of most FBG Optical Fider Hybrogen Sensor is longer, only in the environment of low temperature and high humility, could obtain the very short response time.
Summary of the invention
The object of the present invention is to provide a kind of Optical Fider Hybrogen Sensor.This device can be monitored hydrogen leak under the hydrogen of any concentration, also can be for measure the hydrogen of low concentration in air.There is high precision, high repeatable.
The present invention is achieved through the following technical solutions:
The invention provides a kind of Optical Fider Hybrogen Sensor, it is characterized in that: by LED light source (1), 2 * 1 three-dB coupler (2), be coated with WO
3/ Pt film F BG (3), spectroanalysis instrument (4) and air chamber (5) form; 3-dB coupling mechanism (2) two ports are on one side connected with LED light source (1) and spectroanalysis instrument (4) respectively, the other end of 3-dB coupling mechanism (2) be coated with WO
3/ Pt film F BG (3) is connected, and is coated with WO
3/ Pt film F BG (3) is positioned in air chamber (5).The present invention has high precision, and repeatability can be monitored the leak case of hydrogen under the hydrogen of any concentration, also can be for measure the hydrogen of low concentration in air.Be coated with WO
3in/Pt film F BG (3), the proportion of Pt is 5%～10%.
Principle of work of the present invention is: the central wavelength λ of FBG
band the relation between temperature variation Δ T can be represented by following formula: Δ λ
b=(α+ξ) Δ T λ
b. wherein α represents that (for silicon, α is approximately 0.55 * 10 to expansion coefficient
-6/ ℃), for the FBG that is 1550nm for central wavelength, at room temperature, its temperature control is approximately 14pm/ ℃, environment temperature can change grid stroke distance (∧) by thermal diffusion (Δ ∧=α ∧ Δ T), and it equally also can change the effective refractive index n of FBG
eff.By photo-thermal effect n
eff=ξ n
effΔ T.So the change of the wavelength causing due to temperature variation is mainly owing to photo-thermal effect.
The invention has the beneficial effects as follows: the WO of this sensor based on Pt
3the sensor of layer.It can, for the leak case of distributed measurement hydrogen, have the repeatability that high precision is become reconciled.
Accompanying drawing explanation
Fig. 1 is Optical Fider Hybrogen Sensor feature device schematic diagram of the present invention;
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described:
Referring to accompanying drawing 1, a kind of Optical Fider Hybrogen Sensor: it is characterized in that by LED light source (1), 2 * 1 three-dB coupler (2), be coated with WO
3/ Pt film F BG (3), spectroanalysis instrument (4) and air chamber (5) form; 3-dB coupling mechanism (2) two ports are on one side connected with LED light source (1) and spectroanalysis instrument (4) respectively, the other end of 3-dB coupling mechanism (2) be coated with WO
3/ Pt film F BG (3) is connected, and is coated with WO
3/ Pt film F BG (3) is positioned in air chamber (5).Be coated with WO
3in/Pt film F BG (3), the proportion of Pt is 6.5%.
When in unit volume, the concentration of hydrogen is 1%, the wavelength of FBG1, FBG2, FBG3 moves and is respectively 15nm, 22nm, and when the concentration of 18nm. hydrogen in unit volume is 4%, corresponding wavelength moves and is respectively 88pm, 140pm, 115pm.
Claims (2)
1. an Optical Fider Hybrogen Sensor: it is characterized in that by LED light source (1), 2 * 1 three-dB coupler (2), be coated with WO
3/ Pt film F BG (3), spectroanalysis instrument (4) and air chamber (5) form; 3-dB coupling mechanism (2) two ports are on one side connected with LED light source (1) and spectroanalysis instrument (4) respectively, the other end of 3-dB coupling mechanism (2) be coated with WO
3/ Pt film F BG (3) is connected, and is coated with WO
3/ Pt film F BG (3) is positioned in air chamber (5).
2. a kind of Optical Fider Hybrogen Sensor according to claim 1, is characterized in that: be coated with WO
3in/Pt film F BG (3), the proportion of Pt is 5%～10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310717582.0A CN103645145A (en) | 2013-12-17 | 2013-12-17 | Optical fiber hydrogen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310717582.0A CN103645145A (en) | 2013-12-17 | 2013-12-17 | Optical fiber hydrogen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103645145A true CN103645145A (en) | 2014-03-19 |
Family
ID=50250396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310717582.0A Pending CN103645145A (en) | 2013-12-17 | 2013-12-17 | Optical fiber hydrogen sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931431A (en) * | 2015-06-24 | 2015-09-23 | 中国计量学院 | FPI (Fabry-Perot interferometer) hydrogen sensor based on fiber brag grating microcavity |
| CN106525736A (en) * | 2016-12-27 | 2017-03-22 | 中国计量大学 | Optical fiber sensor for measuring hydrogen gas concentration |
| CN107101951A (en) * | 2017-05-07 | 2017-08-29 | 东北大学 | It is a kind of to be used for the fibre optical sensor of density of hydrogen and temperature simultaneously measuring |
| CN108489901A (en) * | 2018-03-29 | 2018-09-04 | 武汉理工大学 | Optical fiber hydrogen detecting system based on New Hydrogen sensitive film |
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| US5838843A (en) * | 1995-03-06 | 1998-11-17 | Doryokuro Kakunenryo Kaihatsu Jigyodan | Multipurpose optical sensor |
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2013
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931431A (en) * | 2015-06-24 | 2015-09-23 | 中国计量学院 | FPI (Fabry-Perot interferometer) hydrogen sensor based on fiber brag grating microcavity |
| CN106525736A (en) * | 2016-12-27 | 2017-03-22 | 中国计量大学 | Optical fiber sensor for measuring hydrogen gas concentration |
| CN107101951A (en) * | 2017-05-07 | 2017-08-29 | 东北大学 | It is a kind of to be used for the fibre optical sensor of density of hydrogen and temperature simultaneously measuring |
| CN107101951B (en) * | 2017-05-07 | 2019-05-10 | 东北大学 | A kind of fibre optical sensor for density of hydrogen and temperature simultaneously measuring |
| CN108489901A (en) * | 2018-03-29 | 2018-09-04 | 武汉理工大学 | Optical fiber hydrogen detecting system based on New Hydrogen sensitive film |
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Application publication date: 20140319 |