CN110186913A - A kind of slant Bragg fiber grating hydrogen gas sensor based on PDMS - Google Patents
A kind of slant Bragg fiber grating hydrogen gas sensor based on PDMS Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims abstract description 34
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 title claims abstract description 33
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000004205 dimethyl polysiloxane Substances 0.000 title claims abstract description 25
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 title claims abstract description 25
- 235000013870 dimethyl polysiloxane Nutrition 0.000 title claims abstract description 24
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 title claims abstract description 24
- 239000001257 hydrogen Substances 0.000 claims abstract description 36
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 17
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 17
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 17
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 17
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 17
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- 239000013307 optical fiber Substances 0.000 claims abstract description 15
- 150000002431 hydrogen Chemical class 0.000 claims description 15
- 238000000034 method Methods 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000004528 spin coating Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910002621 H2PtCl6 Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002522 swelling effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000001235 sensitizing effect Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229920005573 silicon-containing polymer Polymers 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/06—Coating with compositions not containing macromolecular substances
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
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- G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/775—Indicator and selective membrane
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Abstract
The slant Bragg fiber grating hydrogen gas sensor based on PDMS that the invention discloses a kind of, by slant Bragg fiber Bragg grating (FBG) demodulator, computer, coupler, single mode optical fiber, gas chamber mixes the WO of catalyst with reference to FBG3Add SiO2Hybrid films, PDMS sense TFBG, gas flow controller, hydrogen generator, air pump, light source composition；Wherein on the sensing TFBG for applying attachment PDMS, the WO that 40nm mixes catalyst is plated by spin-coating method3Add SiO2Hybrid films.WO3Add SiO2Hybrid films have preferable mechanical performance, improve the performance of inclined optical fiber grating hydrogen gas sensor.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, and in particular to a kind of slant Bragg fiber grating hydrogen based on PDMS
Gas sensor.
Background technique
Since dimethyl silicone polymer (PDMS) elastomer has the advantages that excellent elastic property and good adhesiveness,
And heated easily expansion, it is a kind of very promising material in sensory field of optic fibre.
Using sol-gal process by WO3It is deposited on fiber grating, H2PtCl6·6H2O is as catalyst, in various concentration hydrogen
The wavelength of fiber grating varies widely under gas.
WO3/SiO2Powder is used as sensitizing range, when sensor is exposed in the air for be mixed with hydrogen, redox reaction
It will lead to environment temperature raising, the thermal expansion due to PDMS caused to lead to transducing part change in shape.
SiO2There are many holes, the hydrone in moist substance is removed by suction-operated, that is, passes through the surface of solids
Particle and various gases, liquid etc. in hydrone mutual attractive force occurs and is adsorbed in solid matter surface.
Since slant Bragg fiber grating (TFBG) unique coupled modes make it not only to the environment parameter pole of surrounding
It is sensitive, and the problem of be able to solve the temperature and stress cross sensitivity of slant Bragg fiber grating, therefore in sensing etc.
There is more application in field.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of slant Bragg optical fiber light based on PDMS
Grid hydrogen gas sensor prepares WO using colloidal sol gelling process using the heated easy swelling properties of PDMS3/SiO2Presoma, and be added
H2PtCl6·6H2O generates catalyst, then plates 5nm WO3/SiO2 hybrid films by spin coating normal direction slant Bragg fiber grating,
Form hydrogen gas sensor.
The invention is realized by the following technical scheme: a kind of slant Bragg fiber grating hydrogen sensing based on PDMS
Device, by slant Bragg fiber Bragg grating (FBG) demodulator (1), computer (2), coupler (3), single mode optical fiber (4), gas chamber (5), reference
FBG (6), mixes the WO of catalyst3/SiO2Hybrid films (7), PDMS (8) are sensed TFBG (9), gas flow controller (10), hydrogen
Generator (11), air pump (12), light source (13) composition；It is characterized by: computer (2) and slant Bragg fiber grating solution
The connection of instrument (1) right end is adjusted, slant Bragg fiber Bragg grating (FBG) demodulator (1) left end is connect with coupler (3) right end, wherein tilting cloth
Variation of glug fiber Bragg grating (FBG) demodulator (1) the detection fiber grating wavelength with density of hydrogen, coupler (3) left end and optical fiber (4)
One end connection, optical fiber (4) other end are carved with the reference FBG (6) that central wavelength is 1550nm respectively and apply attachment PDMS (8) basic mode
Central wavelength is the sensing TFBG (9) of 1610nm, and the WO for mixing catalyst is coated in PDMS (8) outer layer3/SiO2Hybrid films (7), plating
There is the WO for mixing catalyst3/SiO2Hybrid films (7) with a thickness of 40nm.Sensing TFBG (9) is connect with light source (13), connects gas chamber
(5) gas flow controller (10) is separately connected hydrogen generator (11) and air pump (12), when density of hydrogen changes,
The central wavelength of sensing TFBG (9) can drift about, poor by calculating the drift detected, can measure density of hydrogen and its change
Change amount can be used to carry out temperature drift correction with reference to FBG (6), and the bragg wavelength of sensing TFBG (9) can be used as zero point drift
Move calibration.It avoids that hydrogen sensitive material is easy to fall off, makes complicated disadvantage, be able to achieve quickly repeatedly measurement, and measure accurate
Degree and sensitivity greatly improve problem.
The working principle of the invention is: using apply invest slant Bragg fiber grating surface PDMS adhesion and by
The easy swelling properties of heat, WO is sticked in outside3/SiO2Powder and catalyst, with the raising of density of hydrogen, Pt/WO3Powder and hydrogen
Redox reaction occurs, chemical equation is as follows:
Using platinum as catalyst, WO3Vigorous reaction occurs with hydrogen, releases energy to ambient enviroment.Drawn by measuring exothermic reaction
The temperature change risen, can calculate density of hydrogen.When there is no hydrogen, WO3-xIt can be oxidized to WO in air3.Therefore it is based on
The hydrogen sensor of these reactions can be used for duplicate measurements.Work as WO3When reacting with hydrogen, light absorption and refractive index can all become
Change.But since effective mode field diameter of single mode optical fiber is several microns bigger than core diameter, the slant Bragg fiber grating
The optical constant variation of hydrogen gas sensor can be ignored.Therefore, the central wavelength of nominal tilt bragg grating is not by ring
The influence of border refractive index, due to WO3Lattice constant variation is smaller in hydrogen response process, therefore physics caused by its volume change
Stress influences sensor performance little.
Relationship between the central wavelength and temperature change (t) of slant Bragg fiber grating can be indicated with equation:
ΔλB=(α+ξ) Δ T λB
Wherein, α is the coefficient of expansion, and ξ is thermo-optical coeffecient.Environment temperature can change grating space ∧ by thermal expansion, and formula is as follows:
Δ Λ=α Λ Δ T
The effective refractive index Δ n of slant Bragg fiber grating can also be changed by thermo-optic effecteff, formula is as follows:
Δneff=ξ neff·ΔT
Therefore, the drift of slant Bragg optic fiber grating wavelength caused by temperature change is mainly due to thermo-optic effect.In order to prepare
Comparatively safe hydrogen sensor, when hydrogen concentration is in explosive range, hydrogen is not to be exceeded in the raising of temperature caused by hydrogen sensitive material
Combustion limits.
The beneficial effects of the present invention are: the slant Bragg fiber grating hydrogen in design of the invention based on PDMS senses
Device, avoids that hydrogen sensitive material is easy to fall off, makes complicated disadvantage, is able to achieve quickly repeatedly measurement, and measuring accuracy and
Sensitivity greatly improves, and has very strong innovative and practical value, there is good application prospect.
Detailed description of the invention
Fig. 1 is a kind of slant Bragg fiber grating hydrogen gas sensor structural schematic diagram based on PDMS.
Specific embodiment
As shown in Figure 1, a kind of slant Bragg fiber grating hydrogen gas sensor based on PDMS, by slant Bragg optical fiber
Grating demodulation instrument (1), computer (2), coupler (3), single mode optical fiber (4), gas chamber (5) mix catalyst with reference to FBG (6)
WO3/SiO2Hybrid films (7), PDMS (8) are sensed TFBG (9), gas flow controller (10), hydrogen generator (11), air pump
(12), light source (13) forms；It is characterized by: computer (2) is connect with slant Bragg fiber Bragg grating (FBG) demodulator (1) right end,
Slant Bragg fiber Bragg grating (FBG) demodulator (1) left end is connect with coupler (3) right end, wherein slant Bragg fiber grating demodulation
With the variation of density of hydrogen, coupler (3) left end connect instrument (1) detection fiber grating wavelength with optical fiber (4) one end, optical fiber (4)
It is 1610nm that the other end, which is carved with the reference FBG (6) that central wavelength is 1550nm respectively and applies attachment PDMS (8) basic mode central wavelength,
Sensing TFBG (9), the WO for mixing catalyst is coated in PDMS (8) outer layer3/SiO2Hybrid films (7), are coated with the WO for mixing catalyst3/
SiO2Hybrid films (7) with a thickness of 40nm.Sensing TFBG (9) is connect with light source (13), the gas flow control of connection gas chamber (5)
Device (10) is separately connected hydrogen generator (11) and air pump (12), when density of hydrogen changes, senses the center of TFBG (9)
Wavelength can drift about, poor by calculating the drift detected, can measure density of hydrogen and its variable quantity, can with reference to FBG (6)
To be used to carry out temperature drift correction, the bragg wavelength of sensing TFBG (9) can be used as null offset calibration.Avoid hydrogen
Sensitive material is easy to fall off, makes complicated disadvantage, is able to achieve quickly repeatedly measurement, and measuring accuracy and sensitivity greatly improve
Problem.
Claims (1)
1. a kind of slant Bragg fiber grating hydrogen gas sensor based on PDMS, by slant Bragg fiber Bragg grating (FBG) demodulator
(1), computer (2), coupler (3), single mode optical fiber (4), gas chamber (5) mix the WO of catalyst with reference to FBG (6)3Add SiO2Mixing
Film (7), PDMS (8) are sensed TFBG (9), gas flow controller (10), hydrogen generator (11), air pump (12), light source
(13) it forms；It is characterized by: computer (2) is connect with slant Bragg fiber Bragg grating (FBG) demodulator (1) right end, slant Bragg
Fiber Bragg grating (FBG) demodulator (1) left end is connect with coupler (3) right end, and wherein slant Bragg fiber Bragg grating (FBG) demodulator (1) detects
With the variation of density of hydrogen, coupler (3) left end connect optic fiber grating wavelength with optical fiber (4) one end, optical fiber (4) other end difference
It is carved with the reference FBG (6) and apply the sensing TFBG that attachment PDMS (8) basic mode central wavelength is 1610nm that central wavelength is 1550nm
(9), it is coated in PDMS (8) outer layer and mixes the WO of catalyst3Add SiO2Hybrid films (7), are coated with the WO for mixing catalyst3Add SiO2Mixing
Film (7) with a thickness of 40nm.Sensing TFBG (9) is connect with light source (13), the gas flow controller (10) point of connection gas chamber (5)
Not Lian Jie hydrogen generator (11) and air pump (12), when density of hydrogen changes, sensing TFBG (9) central wavelength can send out
Raw drift, it is poor by calculating the drift detected, density of hydrogen and its variable quantity can be measured, with reference to FBG (6) can be used into
Trip temperature drift calibration, the bragg wavelength of sensing TFBG (9) can be used as null offset calibration.
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| CN201910539629.6A CN110186913A (en) | 2019-06-20 | 2019-06-20 | A kind of slant Bragg fiber grating hydrogen gas sensor based on PDMS |
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| CN201910539629.6A CN110186913A (en) | 2019-06-20 | 2019-06-20 | A kind of slant Bragg fiber grating hydrogen gas sensor based on PDMS |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426653A (en) * | 2020-05-18 | 2020-07-17 | 中国计量大学 | Hydrogen sensor based on metal organic framework and zero drift calibration |
| CN113758902A (en) * | 2021-08-24 | 2021-12-07 | 比羿激光科技(湖州)有限公司 | Based on WO3Sagnac interference type optical fiber hydrogen sensor |
| CN114812886A (en) * | 2022-04-29 | 2022-07-29 | 威海长和光导科技有限公司 | Intelligent hydrogel optical fiber sensor and preparation device and preparation method thereof |
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| CN114812886A (en) * | 2022-04-29 | 2022-07-29 | 威海长和光导科技有限公司 | Intelligent hydrogel optical fiber sensor and preparation device and preparation method thereof |
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