CN206114524U - Optical fiber relative humidity sensor based on oxidation graphene films and peanut shape structure - Google Patents
Optical fiber relative humidity sensor based on oxidation graphene films and peanut shape structure Download PDFInfo
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- CN206114524U CN206114524U CN201621137680.2U CN201621137680U CN206114524U CN 206114524 U CN206114524 U CN 206114524U CN 201621137680 U CN201621137680 U CN 201621137680U CN 206114524 U CN206114524 U CN 206114524U
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Abstract
The utility model discloses an optical fiber relative humidity sensor based on oxidation graphene films and peanut shape structure, by the SLED light source, polarization controller, optic fibre peanut shape structure, polarization maintaining fiber, fibre core dislocation, single mode fiber, fiber optic spectrometer, the oxidation graphite alkene quick film that wet, micro - displacement platform, permanent the box of temperature and permeability constitution. Optic fibre peanut shape structure, polarization maintaining fiber and fibre core dislocation connect gradually, constituted embedded mach once, optic fiber interference appearance morally. The wet quick film of oxidation graphite alkene adsorbs or disengages the hydrone, and optic fibre surface effective refractive index changes, and fast slow axis light interference peak's intensity takes place the drift in the output spectrum, consequently, through the intensity of monitoring fast slow axis light interference peak, according to the initial strength calculation drift amount who demarcates, just can record current hygrometry again. This invention have compact structure, sensitivity high, to advantages such as electromagnetic interference immunity, resistant foreign gas interference, the ambient temperature that can be applicable to the actual production life detects.
Description
Technical field
This utility model belongs to light fibre humidity field of sensing technologies, and in particular to one kind is based on graphene oxide film and flower
The light fibre humidity transducer of raw shape structure.
Background technology
At present, humidity detection means in terms of mechanical humidity with electric chemical formula drimeter based on, it is many production neck
Leading position is occupied in domain.However, in the complicated such as nuclear industry of High Temperature High Pressure, signal long-distance transmission, electromagnetic signal, electricity
The special occasions such as power transmission, traditional humidity sensor easily fails, or even exposes potential safety hazard.
Light fibre humidity sensing has broken away from the framework of traditional mechanical/electricity humidity sensor, innovatively with optical fiber as carrier, passes through
Optical signal is detecting humidity, thus, compact high with sensitivity, to electromagnetic interference immunity, resistance to chemical attack, it is easy to distribution
The features such as formula is monitored, for the humidity sensor under solution special environment feasible approach is provided.
It is less to there is measurement range in the humidity sensitive materials such as the electrolyte of early stage, quasiconductor, sluggish serious, easily aging
Phenomenon.Although subsequent occurrences of macromolecular material wettability power is improved, high humidity environment is not suitable for.At present, light fibre humidity
Sensing mainly uses the humidity sensitive materials such as polyvinyl alcohol (PVA), agarose, Nafion- crystal violets, polyimides (PI).With
The continuous progress of nanotechnology, the excellent humidity sensitivity of a collection of novel nano-material with Graphene as representative gradually by
It was found that.
The content of the invention
For the deficiencies in the prior art, the purpose of this utility model is to provide one kind based on graphene oxide film and flower
The light fibre humidity transducer of raw shape structure, the novel embedded Mach-Zehnder optical fiber of a structure is prepared on optical fiber and is interfered
Instrument, and uniformly plate graphene oxide (Graphene oxide, GO) thin film on its surface.The difference energy of the thin film moisture absorption degree
Cause effective refractive index to change, using the stronger birefringence of polarization maintaining optical fibre and relevant signal to noise ratio, be greatly enhanced this new
The sensitivity of humidity sensor and resolution.
This utility model is achieved through the following technical solutions：Optical fiber based on graphene oxide film and Semen arachidis hypogaeae shape structure is wet
Degree sensor, it is characterised in that：By SLED light sources (1), Polarization Controller (2), optical fiber Semen arachidis hypogaeae shape structure (3), polarization maintaining optical fibre
(4), fibre core dislocation (5), single-mode fiber (6), fiber spectrometer (7), graphene oxide humidity sensitive thin film (8), micro-displacement platform
(9), constant temperature humidity cabinet (10) composition；SLED light sources (1) are by Polarization Controller (2) and optical fiber Semen arachidis hypogaeae shape structure (3) left end phase
Even；Optical fiber Semen arachidis hypogaeae shape structure (3), polarization maintaining optical fibre (4) and fibre core dislocation (5) are sequentially connected, and constitute embedded Mach-Zehnder light
Fine interferometer；Fibre core dislocation (5) right-hand member is connected with single-mode fiber (6) left end, single-mode fiber (6) right-hand member incoming fiber optic spectrogrph
(7)；Wherein, polarization maintaining optical fibre (4) surface uniformly plates graphene oxide humidity sensitive thin film (8) and constitutes sensor probe, optical fiber Semen arachidis hypogaeae shape
Structure (3), polarization maintaining optical fibre (4), fibre core dislocation (5), single-mode fiber (6) is fixed on constant temperature humidity cabinet by micro-displacement platform (9)
(10) bottom.
Described optical fiber Semen arachidis hypogaeae shape structure (3) is made by single-mode fiber and polarization maintaining optical fibre, the diameter of lumbar vertebra amplification region
For 160 μm～180 μm, the distance between fibre core is 120 μm～150 μm.
Described polarization maintaining optical fibre (4) length is 8mm～15mm, and preferred model is YOFC 1017-C panda type polarization-preserving fibers.
Described polarization maintaining optical fibre (4) and single-mode fiber (6) manual weld constitutes fibre core dislocation (5), and radial misalignments distance is
4.5 μm～5.5 μm, dislocation form is that the fibre core of single-mode fiber (6) misplaces along between polarization maintaining optical fibre (4) fast and slow axis.
The thickness of described graphene oxide humidity sensitive thin film (8) is 1 μm～3 μm, and the piece footpath of graphene oxide used is more than
500nm。
Operation principle of the present utility model is：The broadband light of SLED light sources (1) transmitting is inclined by Polarization Controller (2) adjustment
Optical fibre flower life shape structure (3) is entered after state of shaking.Transmission light when the single-mode fiber lumbar vertebra amplification region in left side, a part of light by
In being unsatisfactory for total reflection condition and be coupled in covering to form cladding mode, a part of light continues in fibre core in the form of core mode
Transmission.The covering of two kinds of optical fiber mutually merges in optical fiber Semen arachidis hypogaeae shape structure (3), and cladding mode is transmitted directed along covering, core mode
Then enter the form that polarization maintaining optical fibre (4) fibre core is converted into s light and f light.Fibre core dislocation (5) can be by the portion in polarization maintaining optical fibre (4)
Subcontract layer mould is coupled in the fibre core of single-mode fiber (6) again, interferes so as to form Mach-Zehnder between core mode.
In ambient humidity change procedure, the phase contrast between cladding mode and core mode depends on effective folding of optical fiber surface
Rate is penetrated, is expressed as：
In formula,The difference of fiber core refractive index and m rank covering Effective indexes is represented, λ is optical wavelength, and L is sensing
The length of arm.
The intensity of interference fringe is expressed as in Mach-Zehnder interferometer：
In formula, IcladdingAnd IcoreThe light intensity of core mode and cladding mode is represented respectively.When graphene oxide humidity sensitive thin film
(8) adsorbing and disengaging hydrone causes thin film effective refractive index to change, and changes the phase contrast between cladding mode and core mode,
Envionmental humidity change is just recorded in the interference spectrum of output.
Due to introducing polarization maintaining optical fibre (4), the output spectrum of the Mach-Zehnder interferometer is quick to the polarization state of incident illumination
Sense.Polarization Controller (2) is adjusted to suitable position, the intensity at fast and slow axis interference of light peak is significantly stronger than general interference peaks, soon
Axle light and the corresponding peak wavelength of slow axial light are expressed as：
In formula,WithWithRespectively core mode/the cladding mode of expression fast axial light/slow axial light is effective
Refractive index.Graphene oxide humidity sensitive thin film (8) adsorbs or disengages hydrone, causes optical fiber surface effective refractive index to change,
The intensity drift at fast and slow axis interference of light peak is the most notable, therefore, by the light intensity for monitoring fast and slow axis interference of light peak, further according to initial
The Strength co-mputation drift value of demarcation, it is possible to measure current relative humidity.
The beneficial effects of the utility model are：(1) hydrophilic of graphene oxide is extremely strong, it is easy in optical fiber surface film forming,
And specific surface area is big, it is particularly suitable for the situation of the lower adsorbed water molecule of tiny area product, is also equipped with not disturbed by acidic and alkaline gas,
The advantage such as thermal noise is less；(2) make optical fiber Semen arachidis hypogaeae shape structure and only need to common commercial heat sealing machine and two welding steps, with regard to energy
High coupling efficiency, relatively low splice loss, splice attenuation are obtained, the novel Mach-Zehnder optical fiber interferometer of structure is constructed with this；Therefore, originally
Utility model has the advantages that compact conformation, sensitivity be high, immune to electromagnetic interference, resistance to foreign gas is disturbed, and can be suitably used for reality
In the ambient humidity detection of border productive life.
Description of the drawings
Fig. 1 is the system construction drawing of the light fibre humidity transducer based on graphene oxide film and Semen arachidis hypogaeae shape structure.
Fig. 2 is to be based on Mach-Zehnder optical fiber in the light fibre humidity transducer of graphene oxide film and Semen arachidis hypogaeae shape structure to do
The structural representation of interferometer.
Fig. 3 is that the light fibre humidity transducer based on graphene oxide film and Semen arachidis hypogaeae shape structure is under different humidity environment
The light intensity variation diagram of slow axial light interference peaks.
Fig. 4 is to be based on slow axial light interference peaks light intensity in the light fibre humidity transducer of graphene oxide film and Semen arachidis hypogaeae shape structure
The matched curve figure of change.
Specific embodiment
Below in conjunction with the accompanying drawings this utility model is described in further detail with specific embodiment.
Referring to accompanying drawing 1, the light fibre humidity transducer based on graphene oxide film and Semen arachidis hypogaeae shape structure is by SLED light sources
(1), Polarization Controller (2), optical fiber Semen arachidis hypogaeae shape structure (3), polarization maintaining optical fibre (4), fibre core dislocation (5), single-mode fiber (6), optical fiber
Spectrogrph (7), graphene oxide humidity sensitive thin film (8), micro-displacement platform (9), constant temperature humidity cabinet (10) composition；SLED light sources (1)
It is connected with optical fiber Semen arachidis hypogaeae shape structure (3) left end by Polarization Controller (2)；Optical fiber Semen arachidis hypogaeae shape structure (3), polarization maintaining optical fibre (4) and
Fibre core dislocation (5) is sequentially connected, and constitutes embedded Mach-Zehnder optical fiber interferometer；Fibre core dislocation (5) right-hand member and single-mode fiber
(6) left end is connected, single-mode fiber (6) right-hand member incoming fiber optic spectrogrph (7)；Wherein, polarization maintaining optical fibre (4) surface uniformly plates oxidation
Graphene humidity sensitive thin film (8) constitutes sensor probe, optical fiber Semen arachidis hypogaeae shape structure (3), polarization maintaining optical fibre (4), fibre core dislocation (5), single mode
Optical fiber (6) is fixed on constant temperature humidity cabinet (10) bottom by micro-displacement platform (9).Referring to accompanying drawing 2, optical fiber Semen arachidis hypogaeae shape structure (3) by
Single-mode fiber and polarization maintaining optical fibre are made, a diameter of 160 μm～180 μm of lumbar vertebra amplification region, and the distance between fibre core is 120
μm～150 μm；Polarization maintaining optical fibre (4) length is 8mm～15mm, and preferred model is YOFC 1017-C panda type polarization-preserving fibers；Protect inclined
Optical fiber (4) and single-mode fiber (6) manual weld constitute fibre core dislocation (5), and radial misalignments distance is 4.5 μm～5.5 μm, and misplace shape
Formula is that the fibre core of single-mode fiber (6) misplaces along between polarization maintaining optical fibre (4) fast and slow axis；The film of graphene oxide humidity sensitive thin film (8)
Thickness is 1 μm～3 μm, and the piece footpath of graphene oxide used is more than 500nm.
Optical fiber Semen arachidis hypogaeae shape structure (3) is made using single-mode fiber and polarization maintaining optical fibre, the optical fiber splicer model of employing
For Fujikura 60s.First, single-mode fiber is peelled off the coat of 2cm～3cm, is cut flat with cutter and controlled manually after end face
Heat sealing machine carries out lumbar vertebra amplifieroperation, and its main discharge parameter has：Discharge time 2500ms, strength of discharge 25bit, welding is overlapped
50 μm of amount.Fiber end face melts to form spherical shape in discharge process, and continuous discharge causes for 7 times the radius that lumbar vertebra amplifies to reach about 80
μm.Identical operation, the lumbar vertebra amplification region of the radius such as formation and single-mode fiber are imposed to polarization maintaining optical fibre.Then, by two optical fiber
In being reentered into heat sealing machine, modification discharge time to 1500ms, manual actuation motor aligns the lumbar vertebra amplification region of both sides, manually
Electric discharge completes the welding of optical fiber Semen arachidis hypogaeae shape structure (3).
Manually welding procedure controls the radial deflection distance of fibre core dislocation (5).Peanut shaped structure (3) and end face are cut
Cut smooth single-mode fiber (6) to be put in optical fiber splicer, manually controlling motor adjusts the side-play amount between two sections of fiber cores
For the half (about 4.5 μm) of single-mode fiber (6) core diameter, then reduce the interval of both ends of the surface, both ends of the surface patch is caused as far as possible
Close, electric discharge manually completes the welding of fibre core dislocation (5).
In experimentation, micro-displacement platform (9) maintains optical fiber horizontal at the Mach-Zehnder optical fiber interferometer exceptionally straight, permanent
The interior temperature of humiture case (10) is maintained at 22 degrees Celsius.
The operation principle of the new relative humidity Fibre Optical Sensor is：The broadband light of SLED light sources (1) transmitting is by polarization
Optical fibre flower life shape structure (3) is entered after the polarization state of controller (2) adjustment light.Optical fiber Semen arachidis hypogaeae shape structure (3), polarization maintaining optical fibre
(4) it is sequentially connected with fibre core dislocation (5), constitutes embedded Mach-Zehnder optical fiber interferometer.The graphite oxide of the body structure surface
Alkene humidity sensitive thin film (8) adsorbs or disengages the process of hydrone and causes the change of optical fiber surface effective refractive index, slow in output spectrum
The intensity at axle interference of light peak produces drift.Therefore, by the light intensity of monitoring slow axial light interference peaks, further according to the initial intensity demarcated
Calculate drift value, it is possible to measure current relative humidity.
Fig. 3 is the slow axial light at 1552.8nm wavelength under 22 degrees celsius in 20%RH～80%RH humidity ranges
The light intensity variation diagram of interference peaks, it is seen then that as experiment humidity gradually increases, corresponding slow axial light interferes peak intensity to be gradually reduced.
Fig. 4 is the matched curve figure that the light intensity of slow axial light interference peaks follows experiment humidity change, and relative humidity is in 20%RH～80%RH
In the range of, degree of fitting can reach 0.970；Especially, relative humidity is in the range of 35%RH～65%RH, the novel sensor
The high sensitivity of 0.165dB/RH is realized, Linear Quasi is right to have reached 0.996.
Claims (5)
1. based on graphene oxide film and the light fibre humidity transducer of Semen arachidis hypogaeae shape structure, it is characterised in that：By SLED light sources
(1), Polarization Controller (2), optical fiber Semen arachidis hypogaeae shape structure (3), polarization maintaining optical fibre (4), fibre core dislocation (5), single-mode fiber (6), optical fiber
Spectrogrph (7), graphene oxide humidity sensitive thin film (8), micro-displacement platform (9), constant temperature humidity cabinet (10) composition；SLED light sources (1)
It is connected with optical fiber Semen arachidis hypogaeae shape structure (3) left end by Polarization Controller (2)；Optical fiber Semen arachidis hypogaeae shape structure (3), polarization maintaining optical fibre (4) and
Fibre core dislocation (5) is sequentially connected, and constitutes embedded Mach-Zehnder optical fiber interferometer；Fibre core dislocation (5) right-hand member and single-mode fiber
(6) left end is connected, single-mode fiber (6) right-hand member incoming fiber optic spectrogrph (7)；Wherein, polarization maintaining optical fibre (4) surface uniformly plates oxidation
Graphene humidity sensitive thin film (8) constitutes sensor probe, optical fiber Semen arachidis hypogaeae shape structure (3), polarization maintaining optical fibre (4), fibre core dislocation (5), single mode
Optical fiber (6) is fixed on constant temperature humidity cabinet (10) bottom by micro-displacement platform (9).
2. according to claim 1 based on graphene oxide film and the light fibre humidity transducer of Semen arachidis hypogaeae shape structure, it is special
Levy and be：Described optical fiber Semen arachidis hypogaeae shape structure (3) is made by single-mode fiber and polarization maintaining optical fibre, lumbar vertebra amplification region it is a diameter of
160 μm～180 μm.
3. according to claim 1 based on graphene oxide film and the light fibre humidity transducer of Semen arachidis hypogaeae shape structure, it is special
Levy and be：Described polarization maintaining optical fibre (4) length is 8mm～15mm.
4. according to claim 1 based on graphene oxide film and the light fibre humidity transducer of Semen arachidis hypogaeae shape structure, it is special
Levy and be：Described polarization maintaining optical fibre (4) and single-mode fiber (6) manual weld constitutes fibre core dislocation (5), and radial misalignments distance is
4.5 μm～5.5 μm.
5. according to claim 1 based on graphene oxide film and the light fibre humidity transducer of Semen arachidis hypogaeae shape structure, it is special
Levy and be：The thickness of described graphene oxide humidity sensitive thin film (8) is 1 μm～3 μm, and the piece footpath of graphene oxide used is more than
500nm。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370626A (en) * | 2016-10-19 | 2017-02-01 | 中国计量大学 | Optical fiber relative humidity sensor based on oxidized graphene film and peanut-shaped structure |
| CN107188113A (en) * | 2017-06-05 | 2017-09-22 | 东南大学 | A kind of nanometer displacement actuator |
| CN109946239A (en) * | 2019-04-18 | 2019-06-28 | 中国计量大学 | A kind of fibre optical sensor based on thin-core fibers measurement volatile organic gas |
| CN110873701A (en) * | 2019-10-22 | 2020-03-10 | 华南师范大学 | Optical fiber humidity sensor based on Mach-Zehnder interferometer |
| CN111239078A (en) * | 2020-02-18 | 2020-06-05 | 南京信息工程大学 | F-P optical fiber interferometer humidity and transverse pressure sensor based on mixing cavity |
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2016
- 2016-10-19 CN CN201621137680.2U patent/CN206114524U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370626A (en) * | 2016-10-19 | 2017-02-01 | 中国计量大学 | Optical fiber relative humidity sensor based on oxidized graphene film and peanut-shaped structure |
| CN107188113A (en) * | 2017-06-05 | 2017-09-22 | 东南大学 | A kind of nanometer displacement actuator |
| CN107188113B (en) * | 2017-06-05 | 2019-03-12 | 东南大学 | A kind of nanometer displacement actuator |
| CN109946239A (en) * | 2019-04-18 | 2019-06-28 | 中国计量大学 | A kind of fibre optical sensor based on thin-core fibers measurement volatile organic gas |
| CN110873701A (en) * | 2019-10-22 | 2020-03-10 | 华南师范大学 | Optical fiber humidity sensor based on Mach-Zehnder interferometer |
| CN110873701B (en) * | 2019-10-22 | 2023-11-28 | 华南师范大学 | Optical fiber humidity sensor based on Mach-Zehnder interferometer |
| CN111239078A (en) * | 2020-02-18 | 2020-06-05 | 南京信息工程大学 | F-P optical fiber interferometer humidity and transverse pressure sensor based on mixing cavity |
| CN111239078B (en) * | 2020-02-18 | 2022-09-27 | 南京信息工程大学 | F-P optical fiber interferometer humidity and transverse pressure sensor based on mixing cavity |
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