CN206095937U - Hygrometry sensor based on PCF air chamber and slope fiber grating - Google Patents
Hygrometry sensor based on PCF air chamber and slope fiber grating Download PDFInfo
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- CN206095937U CN206095937U CN201621137701.0U CN201621137701U CN206095937U CN 206095937 U CN206095937 U CN 206095937U CN 201621137701 U CN201621137701 U CN 201621137701U CN 206095937 U CN206095937 U CN 206095937U
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Abstract
The utility model discloses a hygrometry sensor based on PCF air chamber and slope fiber grating, by broadband light source, polarization controller, the optic fibre circulator, single mode fiber, the PCF air chamber, slope fiber grating, oxidation graphene films, first spectrum appearance, second spectrum appearance is constituteed. One section PCF in the butt fusion of slope fiber grating front end utilizes that HF is sour to be corroded at the inside glossy hexagon air chamber of inner wall that forms of optic fibre air hole in the PCF, plates the surface at slope fiber grating uniformly with oxidation graphene films to constitute a novel structure's hygrometry sensor. Oxidation graphene films adsorbs and disengages the in -process of hydrone, and the film refracting index changes, combines slope fiber grating to change extremely sensitive characteristic to the optic fibre surface refractive index, realizes the hygrometry measurement. This invents compact structure, sensitivity is high, effectively eliminates the temperature intersection tender subject of humidity sensing in -process, has certain practical application and worth.
Description
Technical field
The utility model belongs to light fibre humidity field of sensing technologies, and in particular to one kind is based on PCF air chambers and oblique light
The relative humidity sensor of fine grating.
Background technology
At present, the humidity detection means based on mechanical and electric chemical formula hygrometer, can not meet nuclear industry and electricity
The actual demand of humidity sensor under the conditions of power transmission industry high temperature high pressure, signal long-distance transmission, strong electromagnetic.Light fibre humidity
Sensor has broken away from the framework of tradition machinery/electricity humidity sensor, innovatively with optical fiber as carrier, complexity is instead of comprehensively
Frame for movement, causes in recent years extensive concern and studies.
Photonic crystal fiber (Photonic Crystal Fiber, PCF) can be divided into refractive-index-guiding according to guide-lighting principle
Two kinds of type and Bandgap-photonic, with the unimodular property without cut-off, flexible controllable dispersion characteristics and excellent birefringent characteristic
Deng.At present, the application study of PCF oneself cover communication, sensing, micro Process, nonlinear optics, or even medicine, environment, petrochemical industry etc.
Numerous sciemtifec and technical spheres.
Inclined optical fiber grating (Tilted Fiber Bragg Grating, TFBG) is that grid plane has a clamp with optical axis
The special short-period grating at angle, the special structure can effectively encourage the cladding mode sensitive to optical fiber surface environment high, and
The advantage of tool FBG and LPG, while with the quick intercrossing of low-heat and strong polarization independent characteristic, conciliating in sensory field of optic fibre
Certainly the aspect such as Cross-sensitivity of Fiber Grating sensing problem obtains more concern.
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 PCF air chambers and oblique light
The relative humidity sensor of fine grating, corrosion treatmentCorrosion Science is carried out to PCF in its internal build hexagonal air chamber, to incline optical fiber light
The graphene oxide on grid surface as humidity sensitive medium, formed a kind of structure it is novel based on PCF air chambers and incline optical fiber
The relative humidity Fibre Optical Sensor of grating.During the graphene oxide film adsorbs and disengages hydrone, corresponding film
Refractive index changes, and relative humidity is realized to the extremely sensitive characteristic of optical fiber surface ambient refractive index with reference to inclined optical fiber grating
The purpose of measurement.The novel sensor has the advantages of compact conformation, sensitivity are high, and temperature characterisitic is excellent, effectively solving humidity
Temperature cross-over tender subject in sensing process.
The utility model is achieved through the following technical solutions：It is a kind of based on the relative of PCF air chambers and inclined optical fiber grating
Humidity sensor, it is characterised in that：By wideband light source (1), Polarization Controller (2), fiber optical circulator (3), single-mode fiber (4),
PCF air chambers (5), inclined optical fiber grating (6), graphene oxide film (7), the first spectrometer (8), the second spectrometer (9) group
Into；Wideband light source (1) is connected by Polarization Controller (2) with a ports of fiber optical circulator (3), the b ends of fiber optical circulator (3)
Mouth is connected with the left end of single-mode fiber (4)；Single-mode fiber (4), PCF air chambers (5), inclined optical fiber grating (6) and graphite oxide
Alkene film (7) constitutes wet sensing probe, and wherein graphene oxide film (7) is uniformly plated in the surface of inclined optical fiber grating (6)；
The c ports of fiber optical circulator (3) are connected to the first spectrometer (8), and the right-hand member of inclined optical fiber grating (6) is connected to the second spectrometer
(9)。
Described PCF air chambers (5) length is 3mm～4mm, and the preferred model of PCF used is LMA-10.
Effective angle of inclination of described inclined optical fiber grating (6) is 6 °～10 °, and grid region length is 8mm～12mm.
The thickness of described graphene oxide film (7) is 1 μm～1.5 μm, and the piece footpath of graphene oxide used is more than
500nm。
Operation principle of the present utility model is：The core diameter of single-mode fiber (4) is about 8 μm, and light energy concentrates on fibre core
Middle propagation.Wideband light source (1) is connected with Polarization Controller (2) and produces polarised light, due to the characteristic of circulator unidirectional loop transmission,
The polarised light is entered from a ports of fiber optical circulator (3), along the outgoing of b ports and by PCF air chambers (5), is transmitted to oblique light
Fine grating (6).Because there is certain inclination angle, the coupling condition of transmission light with optical fiber axial direction in the grid plane of inclined optical fiber grating (6)
Change, motivate two kinds of different transmission modes, a kind of core mode for being to meet Bragg matching conditions, another kind is full
The cladding mode of sufficient covering matching condition, change of the cladding mode to optical fiber surface environmental change, particularly refractive index is very sensitive,
Both are respectively along fibre core and covering reverse transfer.Graphene oxide film (7) is equably plated in into inclined optical fiber grating (6)
Surface, the film has good Unordered system, and film refractive index changes during adsorbing and disengaging hydrone, inhales
The difference of wet degree can significantly change the wavelength of cladding mode.Both of which is through PCF air chambers (5) and inclined optical fiber grating
(6) during fusion point, because the thin core in PCF air chambers (5) and core diameter are mismatched, core mode and a part of covering are caused
Mode coupling enters PCF air chambers (5), and the fusion point in single-mode fiber (4) and PCF air chambers (5) is coupled into single mode again
The fibre core of optical fiber (4).Reflected light returns to the b ports of fiber optical circulator (3), and from the c ports of fiber optical circulator (3) first is entered
Spectrometer (8), the transmitted light in inclined optical fiber grating (6) continues onwards transmission and enters the second spectrometer (9).
, into certain inclination angle theta, there is each rank covering with optical fiber axial direction in transmission/reflection/angle spectrum in the grating planar of inclined optical fiber grating
Mould, its phase-matching condition is expressed as
λBragg=2nEff, core*Λ/cos(θ) (1)
Λ=ΛT*cos(θ) (3)
In formula, λBraggFor Bragg wavelength,For the i-th rank cladding mode wavelength,WithFibre core is represented respectively
It is in wavelength with coveringWhen effective refractive index, Λ be θ=0 ° when screen periods, ΛTFor inclined optical fiber grating (6)
Screen periods.
The wavelength of each rank cladding mode drifts about with extraneous medium refractive index (SRI) change,Can represent
For
Graphene oxide film (7) is equably plated in into the grid region surface of inclined optical fiber grating (6).When light incidence oblique light
During fine grating (6), the interface of cladding mode incident covering and graphene oxide film (7) at different angles.Work as graphite oxide
Alkene film (7) adsorbs or disengages hydrone, and film refractive index changes, can be in the reflected light of inclined optical fiber grating (6)
The drift of cladding mode wavelength is observed in spectrum.
The beneficial effects of the utility model are：Introduce medium refraction index change in elevation sensitivity and the quick intercrossing of low-heat to external world
Inclined optical fiber grating, greatly improve sensitivity and the heat endurance of the novel humidity sensor.Meanwhile, innovatively by corruption
Erosion processes PCF and builds air chamber in inside of optical fibre, and the design can effectively strengthen the coupling efficiency of cladding mode, is conducive to obtaining higher
Sensitivity and strengthen sensor antijamming capability.The hydrophily of graphene oxide composite material is strong, and specific surface area is big, is particularly suitable for
The situation of the lower adsorbed water molecule of tiny area product, improves the response lower bound of sensing head.Therefore, the utility model has structure tight
Gather, the advantages of sensitivity is high, can to eliminate Temperature cross-over sensitive.
Description of the drawings
Fig. 1 is a kind of based on PCF air chambers and the characterizing arrangement schematic diagram of the relative humidity sensor of inclined optical fiber grating.
Fig. 2 is a kind of the transversal of PCF air chambers in relative humidity sensor based on PCF air chambers and inclined optical fiber grating
Face schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawings the utility model is described in further detail with specific embodiment.
It is a kind of based on PCF air chambers and the relative humidity sensor of inclined optical fiber grating referring to accompanying drawing 1, it is characterised in that：
By wideband light source (1), Polarization Controller (2), fiber optical circulator (3), single-mode fiber (4), PCF air chambers (5), optical fiber light is inclined
Grid (6), graphene oxide film (7), the first spectrometer (8), the second spectrometer (9) composition；Wideband light source (1) is by polarizing control
Device (2) processed is connected with a ports of fiber optical circulator (3), the b ports of fiber optical circulator (3) and the left end phase of single-mode fiber (4)
Even；Single-mode fiber (4), PCF air chambers (5), inclined optical fiber grating (6) and graphene oxide film (7) constitute wet sensitive sense spy
Head, wherein graphene oxide film (7) are uniformly plated in the surface of inclined optical fiber grating (6)；The c ports of fiber optical circulator (3) connect
The first spectrometer (8) is connected to, the right-hand member of inclined optical fiber grating (6) is connected to the second spectrometer (9).Specifically, PCF air chambers
(5) length is 3mm～4mm, and the preferred model of PCF used is LMA-10.Effective angle of inclination of inclined optical fiber grating (6) is 6 °
～10 °, grid region length is 8mm～12mm.The thickness of graphene oxide film (7) is 1 μm～1.5 μm, graphene oxide used
Piece footpath be more than 500nm.
HF acid is corroded to PCF goes out PCF air chambers (5) in its internal build.Specifically, by one section of PCF and inclination
Fiber grating (6) carries out welding, and its end face is cut flat with, and in being then dipped vertically into HF acid solutions, stands 2min.Make in capillary effect
With under, HF acid is initially entered corrodes in the airport of PCF to tube wall, and aperture further increases, until whole cycle knot
Structure corrosion disappears.Simultaneously through corrosion, the solid section in the middle of PCF attenuates, this corrosion process to the damage of single-mode fiber compared with
It is little.PCF air chambers (5) cross section for eventually forming is referring to accompanying drawing 2, and the hexagon for forming an inner wall smooth in inside of optical fibre is empty
Air cavity.
The method of inclined optical fiber grating (6) surface oxidation Graphene plated film is：During a ports of fiber optical circulator (3) are accessed
The LASER Light Source of the long 1480nm of cardiac wave, the power output of light source is fixed as 75mW, in inclined optical fiber grating (6) table while thang-kng
Concentration in the drop of face through ultrasonic disperse is the graphene oxide alcohol suspension of 2mg/L, continues liquid feeding and keeps coating film area wet
Profit, plated film time is 20 minutes.Now, graphene oxide gradually adsorbs in optical fiber table in the presence of optical pressure and photo-thermal effect
Face, monitors the transmitted spectrum of inclined optical fiber grating (6) with the second spectrometer (9) in coating process, prevent light energy too high, structure
It is damaged.Optical fiber is then taken out, is put and is spontaneously dried 24 hours at room temperature, so as to form graphene oxide film (7).
Operation principle of the present utility model is：Wideband light source (1) and Polarization Controller (2) combination produce polarised light, pass through
The a ports of fiber optical circulator (3), along b ports PCF air chambers (5) are entered into and through, and are transmitted to inclined optical fiber grating (6).Incline
There is certain inclination angle in the grid plane of fiber grating (6), encourage two kinds of different transmission modes, cladding mode therein with optical fiber axial direction
Change to optical fiber surface ambient refractive index is very sensitive, along covering reverse transfer.By graphene oxide film (7) equably
The surface of inclined optical fiber grating (6) is plated in, the film is adsorbing and causing film refractive index to occur during disengaging hydrone
Change, significantly changes the wavelength of cladding mode.In the presence of PCF air chambers (5), a part of cladding mode is coupled into list again
The fibre core of mode fiber (4), returns to the b ports of fiber optical circulator (3), and along the c ports of fiber optical circulator (3) the first spectrum is entered
Instrument (8), by relative humidity information record in output spectrum.
Claims (4)
1. a kind of based on PCF air chambers and the relative humidity sensor of inclined optical fiber grating, it is characterised in that：By wideband light source
(1), Polarization Controller (2), fiber optical circulator (3), single-mode fiber (4), PCF air chambers (5), inclined optical fiber grating (6), oxidation
Graphene film (7), the first spectrometer (8), the second spectrometer (9) composition；Wideband light source (1) by Polarization Controller (2) with
The a ports of fiber optical circulator (3) are connected, and the b ports of fiber optical circulator (3) are connected with the left end of single-mode fiber (4)；Single-mode fiber
(4), PCF air chambers (5), inclined optical fiber grating (6) and graphene oxide film (7) constitute wet sensing probe, wherein aoxidizing
Graphene film (7) is uniformly plated in the surface of inclined optical fiber grating (6)；The c ports of fiber optical circulator (3) are connected to the first spectrum
Instrument (8), the right-hand member of inclined optical fiber grating (6) is connected to the second spectrometer (9).
2. according to claim 1 a kind of based on PCF air chambers and the relative humidity sensor of inclined optical fiber grating, it is special
Levy and be：Described PCF air chambers (5) length is 3mm～4mm.
3. according to claim 1 a kind of based on PCF air chambers and the relative humidity sensor of inclined optical fiber grating, it is special
Levy and be：Effective angle of inclination of described inclined optical fiber grating (6) is 6 °～10 °, and grid region length is 8mm～12mm.
4. according to claim 1 a kind of based on PCF air chambers and the relative humidity sensor of inclined optical fiber grating, it is special
Levy and be：The thickness of described graphene oxide film (7) is 1 μm～1.5 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621137701.0U CN206095937U (en) | 2016-10-19 | 2016-10-19 | Hygrometry sensor based on PCF air chamber and slope fiber grating |
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| CN201621137701.0U CN206095937U (en) | 2016-10-19 | 2016-10-19 | Hygrometry sensor based on PCF air chamber and slope fiber grating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248622A (en) * | 2016-10-19 | 2016-12-21 | 中国计量大学 | A kind of Based PC F air chamber and the relative humidity sensor of inclined optical fiber grating |
| CN108844655A (en) * | 2018-04-20 | 2018-11-20 | 武汉中航传感技术有限责任公司 | A kind of fiber grating Temperature Humidity Sensor |
| CN109187442A (en) * | 2018-09-12 | 2019-01-11 | 温州大学 | Graphene enhances inclined optical fiber grating tunnelling ray resonant transducer and its detection system |
-
2016
- 2016-10-19 CN CN201621137701.0U patent/CN206095937U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248622A (en) * | 2016-10-19 | 2016-12-21 | 中国计量大学 | A kind of Based PC F air chamber and the relative humidity sensor of inclined optical fiber grating |
| CN108844655A (en) * | 2018-04-20 | 2018-11-20 | 武汉中航传感技术有限责任公司 | A kind of fiber grating Temperature Humidity Sensor |
| CN108844655B (en) * | 2018-04-20 | 2021-02-26 | 武汉中航传感技术有限责任公司 | Fiber grating temperature and humidity sensor |
| CN109187442A (en) * | 2018-09-12 | 2019-01-11 | 温州大学 | Graphene enhances inclined optical fiber grating tunnelling ray resonant transducer and its detection system |
| CN109187442B (en) * | 2018-09-12 | 2021-04-23 | 温州大学 | Graphene enhanced inclined fiber grating leakage mode resonance sensor and detection system thereof |
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