CN205404392U - Optic fibre hydrogen sensor with temperature compensation function - Google Patents
Optic fibre hydrogen sensor with temperature compensation function Download PDFInfo
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- CN205404392U CN205404392U CN201620161808.2U CN201620161808U CN205404392U CN 205404392 U CN205404392 U CN 205404392U CN 201620161808 U CN201620161808 U CN 201620161808U CN 205404392 U CN205404392 U CN 205404392U
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Abstract
The utility model discloses an optic fibre hydrogen sensor with temperature compensation function comprises broadband light source, circulator, tapered fiber, first optic fibre bragg grating, second optic fibre bragg grating, hydrogen sensitive film, tail optical fiber, grating demodulation appearance. Carry out behind the fused biconical taper on the fibre core in its awl district the FBG that two the same parameters were write in into to the keep (shenglvehao)at a certain distance away to single mode fiber, first optic fibre bragg grating is used for temperature compensating, the even sputter tiPd thin film formation optic fibre hydrogen sensitive head in second optic fibre bragg grating surface. This film has the hydrogen of inhaling expanded characteristic, along with environment hydrogen concentration's change is extrudeed the grating cycle that optic fibre changes FBG, utilizes the difference of two FBG center wavelength drift volumes can eliminate alternately sensitivity of temperature. Utilize the adsorptivity that the ti film is good to optic fibre, keep its degradation of stability and suppression of pd film, this new type sensor's of improvement that can be very big sensitivity and repeatability.
Description
Technical field
The utility model belongs to optical fiber hydrogen field of sensing technologies, is specifically related to a kind of optical fiber with temperature compensation function
Hydrogen gas sensor.
Background technology
H2It is a kind of free of contamination novel energy, can release energy with oxygen reaction and water during burning, in addition to fuel cell,
Hydrogen Energy is also used for other field, such as Aero-Space, aircraft and auto industry.Hydrogen highly volatile and burning, explosion ratio model
Enclose very wide, but electricity sensing device easily produces electric spark, be not suitable for the hydrogen detection in hazardous environment.Optical fiber hydrogen senses
Can overcome the defect of electric sensor, there may be environment such as air accumulator and the pipe surface work of hydrogen leakage, signal passes
Defeated distance is remote, and precision is susceptible to frame for movement interference, becomes the most concerned research field.
Fiber Bragg Grating FBG (FBG) is the fiber grating of most application potential, by periodic modulation fiber core refractive index
Formed.Broadband light wave is when by FBG, and the light wave of centre wavelength is reflected back, and the light of its commplementary wave length is the most unaffected.Institute
Have in the extraneous factor causing FBG reflectance spectrum peak wave length shift, be the most directly stress and temperature parameters.Ambient temperature is led
The thermal expansion caused makes screen periods change, due to the temperature sensitive properties that Fiber Bragg Grating FBG is special, for measuring
Error, the temperature-compensating of strain sensing and stress and the research of temperature joint effect are the important of exploitation fiber-optic grating sensor
Factor.
Summary of the invention
The purpose of this utility model is to provide a kind of Optical Fider Hybrogen Sensor with temperature compensation function, to single-mode optics
Fibre carry out keeping at a certain distance away on the fibre core in the fused biconical taper Hou Qizhui district FBG, a FBG of two identical parameters of write is used for
Temperature-compensating, another FBG surface uniform sputter Ti/Pd film.This film has the characteristic inhaling hydrogen-expansion, along with environment hydrogen
The change extruding optical fiber of concentration changes the screen periods of FBG, utilizes the difference of two FBG centre wavelength drift values can eliminate temperature
Cross sensitivity.Successively sputter Ti film and the Pd film of certain thickness on FBG surface, utilize the absorption that Ti film is good to optical fiber
Property, maintain the stable of Pd film and suppress it to degrade, sensitivity and the repeatability of this novel sensor can be improved greatly.
The utility model is achieved through the following technical solutions: a kind of Optical Fider Hybrogen Sensor with temperature compensation function by
Wideband light source (1), circulator (2), tapered fiber (3), the first Fiber Bragg Grating FBG (4), the second Fiber Bragg Grating FBG
(5), hytrogen sensitive film (6), tail optical fiber (7), grating demodulation instrument (8) composition；Wideband light source (1) connects with a port of circulator (2)
Connecing, tapered fiber (3) is connected with the b port of circulator (2), and grating demodulation instrument (8) is connected with the c port of circulator (2)；Drawing
The first Fiber Bragg Grating FBG (4) and the second Fiber Bragg Grating FBG (5) is write successively on the fibre core in cone optical fiber (3) cone district, its
In the first Fiber Bragg Grating FBG (4) surface exposure be used for carrying out temperature-compensating, the second Fiber Bragg Grating FBG (5) surface is uniform
Sputter hytrogen sensitive film (6) forms fiber optic hydrogen sensing head.
Described tapered fiber (3) is made up through fused biconical taper of single-mode fiber, and cone district fibre diameter is 80 ~ 100 μm, cone
Section length is 20 ~ 25mm.
Described the first Fiber Bragg Grating FBG (4) and the reflection kernel wavelength of the second Fiber Bragg Grating FBG (5) are about
1550nm, reflectivity is 60%, a length of 5 ~ 10mm, and spacing is 5 ~ 10mm.
Described hytrogen sensitive film (6) is specially the Ti/Pd film that thickness is 5nm and 100nm ~ 200nm respectively.
The end face of described tail optical fiber (7) processes through rubbing down, destroys end face smooth.
Operation principle of the present utility model is: the light beam that wideband light source (1) produces centre wavelength 1510nm ~ 1610nm is incident
The a port of circulator (2), owing to circulator (2) has the characteristic making electromagnetic wave unidirectional loop transmit, the light beam that a port is incident
Tapered fiber (3), the first Fiber Bragg Grating FBG (4) and the second optical fiber Bradley will be then passed sequentially through by b port outgoing
The fiber optic hydrogen sensing head that lattice grating (5) and hytrogen sensitive film (6) are formed.Reflection light returns to the b of circulator (2) along reverse path
Port, is received by grating demodulation instrument (8) after c port outgoing.
The end face of tail optical fiber (7) is carried out rubbing down and processes that to destroy end face smooth, it is possible to reduce the Fresnel reflection of end face, thus
Its reflection light is stoped to be re-coupled in the fibre core of tapered fiber (3).
FBG passes through extraneous parameter to Prague central wavelength lambdaBModulation obtain heat transfer agent.Optical fiber meets Bradley
The light of lattice equation will occur reflection greatly
(1)
Wherein λB1、λB2Represent the reflection wavelength of two FBG, n respectivelyeffRepresent the effective refractive index of fibre core, Λ1、Λ2Point
Biao Shi the screen periods of two FBG.When external environment changes, such as temperature and STRESS VARIATION, it will cause Λ1、Λ2's
Change.
The reflection kernel wavelength of the first Fiber Bragg Grating FBG (4) will vary with temperature and drift about, its TEMP mould
Type is
(2)
Wherein neff/ T represents thermal refractive index coefficient, (Δ neff)epRepresent the elasto-optical effect that thermal expansion causes, Λ/T table
Show the thermal linear expansion coefficient of optical fiber, neff/ [(Λ/T)] represents owing to expanding the ripple causing optical fiber core diameter to change and to produce
Lead effect.
The reflection kernel wavelength of the second Fiber Bragg Grating FBG (5) will be with temperature and H2Change in concentration is drifted about, its hydrogen
Concentration sensing model is
(3)
Wherein PHRepresent the H in environment2Dividing potential drop (H2Concentration), a represents and draws the diameter of optical fiber after cone, and b-a represents that hydrogen sensitive is thin
The thickness of film (6), EF=72GPa、EPd=121 GPa represent the Young's modulus of pure silica fiber and palladium material respectively.
Due in this novel sensor the reflection kernel wavelength of the first Fiber Bragg Grating FBG (4) not with H2Concentration changes,
Its wavelength shift only represents the impact of temperature factor, and temperature error can be compensated by the difference of the wavelength shift of two FBG.
H2The wave length shift that change in concentration produces can be expressed as:
(4)
Therefore, when extraneous hydrogen concentration change, the centre wavelength drift measured after temperature-compensating is the most accurate.
The hytrogen sensitive film (6) that the utility model uses is Ti/Pd film, owing to palladium material can absorb 900 times from health
Long-pending H2, therefore, this material is to H2Concentration sensitive, adsorbs H2After molecule, thickness and the volume of Pd film increase.When this film is by sputter
When the surface of the second Fiber Bragg Grating FBG (5), the change of this material thickness and volume can produce stress effect to optical fiber, with
Time change cycle of fiber grating, by the change of reflection peak position in monitoring reflectance spectrum, FBG centre wavelength can be obtained
Drift value, thus reach to detect the purpose of extraneous hydrogen concentration.
The beneficial effects of the utility model are: the utility model, by arranging the FBG of two identical parameters, uses temperature wavelength
Drift value is to different H2Under concentration, the measurement data of FBG centre wavelength drift compensates, and reduces measure error, this optical fiber hydrogen
The antijamming capability of sensor will be significantly improved；Draw cone to process single-mode fiber, cut down cladding thickness, will increase
Strong FBG screen periods is to H2The responding ability of change in concentration, and realize the detectable concentration limit of as little as 0.1%；Meanwhile, proposing will
Thickness be respectively the Ti/Pd film of 5nm and 100nm ~ 200nm as hydrogen sensitive film, utilize the absorption that Ti film is good to optical fiber
Property, maintain the stable of Pd film and suppress it to degrade, the sensitivity of this novel sensor and repeatability will be remarkably reinforced.
Accompanying drawing explanation
Fig. 1 is a kind of Optical Fider Hybrogen Sensor device schematic diagram with temperature compensation function of the present utility model.
Fig. 2 is fiber optic hydrogen sensing head schematic diagram of the present utility model.
Fig. 3 is that Fibre Optical Sensor of the present utility model is at different H2Reflectance spectrum figure under concentration.
Fig. 4 is 1% H of the present utility model2The matched curve that under concentration, reflection peak corresponding wavelength drift value varies with temperature
Figure.
Detailed description of the invention
With detailed description of the invention, the utility model is described in further detail below in conjunction with the accompanying drawings.
See accompanying drawing 1, a kind of Optical Fider Hybrogen Sensor with temperature compensation function, it is characterised in that: by wideband light source
(1), circulator (2), tapered fiber (3), the first Fiber Bragg Grating FBG (4), the second Fiber Bragg Grating FBG (5), hydrogen sensitive
Film (6), tail optical fiber (7), grating demodulation instrument (8) form；Wideband light source (1) is connected with a port of circulator (2), tapered fiber
(3) the b port with circulator (2) is connected, and grating demodulation instrument (8) is connected with the c port of circulator (2)；Bore at tapered fiber (3)
The first Fiber Bragg Grating FBG (4) and the second Fiber Bragg Grating FBG (5), wherein the first optical fiber cloth is write successively on the fibre core in district
Glug grating (4) surface exposure is used for carrying out temperature-compensating, and the second Fiber Bragg Grating FBG (5) surface uniform sputter hydrogen sensitive is thin
Film (6) forms fiber optic hydrogen sensing head.
See accompanying drawing 2, by single-mode fiber at H2Flame in carry out fused biconical taper and make tapered fiber (3), cone district optical fiber
A diameter of 80 μm, cone section length is 20mm, then it is smooth to destroy end face with file polishing, writes first successively on the fibre core in cone district
Fiber Bragg Grating FBG (4) and the second Fiber Bragg Grating FBG (5).The welding of circulator (2) b port and tapered fiber (3) is adopted
Forming with optical fiber splicer standardization program welding, the optical fiber splicer model of employing is Fujikura 60s.Optical fiber Bragg light
Grid use excimer laser write, and screen periods is about 528nm, and length is set to 8mm.
Fig. 3 is that Optical Fider Hybrogen Sensor of the present utility model is at 0% and 1% H2The reflectance spectrum lab diagram of concentration.It is visible,
First Fiber Bragg Grating FBG (4) centre wavelength is about 1549.2nm, and the second Fiber Bragg Grating FBG (5) centre wavelength is about
1550.8nm, H2Concentration from 0% change to 1% time, the wavelength that the second Fiber Bragg Grating FBG (5) reflection peak is corresponding is rectangular to shortwave
To there occurs drift.
Fig. 4 is that Optical Fider Hybrogen Sensor of the present utility model is at 1% H2Under concentration levels, reflection peak corresponding wavelength drift value
The matched curve figure varied with temperature.Along with experimental temperature is gradually increased, the second Fiber Bragg Grating FBG (5) reflection wavelength drifts about
Amount is gradually increased, but the centre wavelength drift value of the first Fiber Bragg Grating FBG (4) and the second Fiber Bragg Grating FBG (5) it
Difference (H2The wave length shift caused) stablize constant, the most effectively achieve temperature-compensating.The utility model is big in room temperature and standard
Under air pressure conditions, it is possible to the H in response 0% ~ 1% concentration range2, the concentration limit of detection is 0.1%, and detection sensitivity is better than
20pm/%, has a good application prospect.
Claims (5)
1. an Optical Fider Hybrogen Sensor with temperature compensation function, it is characterised in that: by wideband light source (1), circulator
(2), tapered fiber (3), the first Fiber Bragg Grating FBG (4), the second Fiber Bragg Grating FBG (5), hytrogen sensitive film (6), tail
Fine (7), grating demodulation instrument (8) composition；Wideband light source (1) is connected with a port of circulator (2), tapered fiber (3) and circulator
(2) b port connects, and grating demodulation instrument (8) is connected with the c port of circulator (2)；On the fibre core in tapered fiber (3) cone district
Write the first Fiber Bragg Grating FBG (4) and the second Fiber Bragg Grating FBG (5), wherein the first Fiber Bragg Grating FBG successively
(4) surface exposure is used for carrying out temperature-compensating, the second Fiber Bragg Grating FBG (5) surface uniform sputter hytrogen sensitive film (6) shape
Become fiber optic hydrogen sensing head.
A kind of Optical Fider Hybrogen Sensor with temperature compensation function the most according to claim 1, it is characterised in that: described
Tapered fiber (3) be made up through fused biconical taper of single-mode fiber, cone district fibre diameter is 80 ~ 100 μm, cone section length is 20 ~
25mm。
A kind of Optical Fider Hybrogen Sensor with temperature compensation function the most according to claim 1, it is characterised in that: described
The first Fiber Bragg Grating FBG (4) and the reflection kernel wavelength of the second Fiber Bragg Grating FBG (5) be about 1550nm, reflectivity
Being 60%, a length of 5 ~ 10mm, spacing is 5 ~ 10mm.
A kind of Optical Fider Hybrogen Sensor with temperature compensation function the most according to claim 1, it is characterised in that: described
Hytrogen sensitive film (6) to be specially thickness be the Ti/Pd film of 5nm and 100nm ~ 200nm respectively.
A kind of Optical Fider Hybrogen Sensor with temperature compensation function the most according to claim 1, it is characterised in that: described
Tail optical fiber (7) end face through rubbing down process, destroy end face smooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620161808.2U CN205404392U (en) | 2016-03-03 | 2016-03-03 | Optic fibre hydrogen sensor with temperature compensation function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620161808.2U CN205404392U (en) | 2016-03-03 | 2016-03-03 | Optic fibre hydrogen sensor with temperature compensation function |
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| CN205404392U true CN205404392U (en) | 2016-07-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572054A (en) * | 2016-03-03 | 2016-05-11 | 中国计量学院 | Optical fiber hydrogen sensor with temperature compensation function |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572054A (en) * | 2016-03-03 | 2016-05-11 | 中国计量学院 | Optical fiber hydrogen sensor with temperature compensation function |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160727 Termination date: 20180303 |