CN105136741A - Graphene coated tilted fiber grating-based liquid refractive index sensor - Google Patents
Graphene coated tilted fiber grating-based liquid refractive index sensor Download PDFInfo
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- CN105136741A CN105136741A CN201510228360.1A CN201510228360A CN105136741A CN 105136741 A CN105136741 A CN 105136741A CN 201510228360 A CN201510228360 A CN 201510228360A CN 105136741 A CN105136741 A CN 105136741A
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Abstract
The present invention relates to a graphene coated tilted fiber grating-based liquid refractive index sensor, the surface of a tilted fiber grating gate region is coated with graphene, by change of the evanescent field distribution and transmission spectral characteristics, a surrounding liquid environment refractive index sensing sensitive area can be enlarged, and the sensitive area moves toward a low refractive index region. When the external environmental parameters (such as molecular concentration, solution refractive index and the like) change to cause graphene complex dielectric constant change so as to cause consequent changes of the effective refractive index of the fiber cladding to cause cladding mode resonance wavelength shifts and coupling strength changes of a tilted fiber grating. By extracting and analyzing of cladding mode resonance wavelength and coupling strength and cladding mode upper and lower enveloping normalized area and other spectral feature amounts, and the external environment liquid refractive index change values can be obtained. Ultimately, the liquid refractive index sensor which has high sensitivity in a low refractive index region and is free of ambient temperature influence can be achieved.
Description
Technical field
The present invention relates to a kind of liquid refractive index sensor based on Graphene coating inclined optical fiber grating, belong to Fibre Optical Sensor field, particularly a kind of fiber-optic grating sensor measured for low-refraction.
Background technology
Inclined optical fiber grating is that a kind of grid face and fiber axis are to the special short period fiber grating having certain angle.Because there is certain inclination in its grid face relative to fiber axis, cause the incident light of fl transmission in a fiber to meet except the reverse transfer core mode of Bragg condition except a part is coupled as, also have another part to be coupled as the cladding mode of a series of reverse transfer.Due to different pattern features to external world environment have different susceptibility, and the effective refractive index of cladding mode is very easily subject to the impact of ambient refractive index, make the resonance wavelength of cladding mode and stiffness of coupling very responsive to the change of ambient refractive index.
Common inclined optical fiber grating liquid refractive index sensor, less to the sensing range of surrounding environment refractive index, and mainly concentrate on the high-refractive-index regions (1.40 ~ 1.45) close with fibre cladding refractive index, and poor at the perception of region of low refractive index (1.33 ~ 1.40).That is, for the region of low refractive index be concerned about in the field such as environmental monitoring, life science, especially a large amount of aqueous solution existing for material molecule, common inclined optical fiber grating has lower perceptual sensitivity.At present, improve the method for inclined optical fiber grating to region of low refractive index perceptual sensitivity to mainly contain: (1) increases the angle of inclination of inclined optical fiber grating, cladding mode is moved to short wavelength region, but, because the stiffness of coupling of short wavelength is more weak, this grid mask has the fiber grating at larger angle of inclination to be still difficult to reach close to sensitivity during cladding index in region of low refractive index; (2) covering or the core diameter of inclined optical fiber grating is reduced, by strengthening its evanescent field strength, the measurement range of refractive index can be expanded to a certain extent, but, the method still fundamentally can not change the inclined optical fiber grating situation low to region of low refractive index sensitivity, and is easily subject to the impact of ambient temperature.Therefore, exploitation one can be responsive to region of low refractive index, and not by the inclined optical fiber grating liquid refractive index sensor of ambient temperature variable effect, be with a wide range of applications.
Summary of the invention
The technical matters solved
In order to avoid the deficiencies in the prior art, the present invention proposes a kind of liquid refractive index sensor based on Graphene coating inclined optical fiber grating, by inclined optical fiber grating surface graphene coated coating, change the sensitivity characteristic of the evanscent field distribution of inclined optical fiber grating and environment to external world, final realization one has higher sensitivity in region of low refractive index, and liquid refractive index sensor not influenced by ambient temperature.
Thought of the present invention is: by being coated on inclined optical fiber grating by grapheme material, change evanscent field distribution and the transmission spectral signatures of inclined optical fiber grating, when external environment parameters is (as molecular conecentration, solution refractive index etc.) change time, the complex permittivity of Graphene can be caused to change, cause the effective refractive index of fibre cladding to change thus thereupon, thus cause the cladding mode resonant wavelength of inclined optical fiber grating to move changing with stiffness of coupling.By extracting and analyze the spectral signature amount such as lower envelope normalized area on cladding mode resonance wavelength, stiffness of coupling and cladding mode, the changing value of external environment liquid refractivity can be obtained.
Technical scheme
A liquid refractive index sensor for Graphene coating inclined optical fiber grating, is characterized in that: be made up of wideband light source 1, single-mode fiber 2, inclined optical fiber grating 3, sample cell 5 and spectroanalysis instrument 6; Wideband light source 1 is connected with one end of inclined optical fiber grating 3 by single-mode fiber 2, and the other end of inclined optical fiber grating 3 is connected with spectroanalysis instrument 6 by single-mode fiber 2.Inclined optical fiber grating 3 passes from two wall apertures of sample cell 5, and is sealed by aperture by structure glue, and keeps the axis of inclined optical fiber grating to be positioned at surface level.
The surface of described inclined optical fiber grating is coated with multi-layer graphene (representative value is 5 layers) coating, and its thickness is 2 ~ 5nm.
The grid face tilt angle of described inclined optical fiber grating is 4 ~ 10 °, and length is 5 ~ 15mm.
Described sample cell is square or hydrostatic column, and two opposing sidewalls has the aperture of 0.5mm, for introducing and drawing inclined optical fiber grating.
Described sample cell can remove in liquid in-situ is measured, and is directly immersed in testing liquid by the inclined optical fiber grating containing Graphene coat, does not need liquid sampling to inject sample cell.
Principle of work of the present invention is: wideband light source 1 sends broadband optical signal, inclined optical fiber grating 3 is entered by single-mode fiber 2, inclined optical fiber grating 3, through sample cell 5 two side, enters spectroanalysis instrument 6 from the light signal of inclined optical fiber grating 3 transmission through single-mode fiber 2.When injecting the liquid of different refractivity in sample cell 5, spectroanalysis instrument 6 is adopted to monitor the spectral signature change of inclined optical fiber grating 3 optical signal transmissive.
Beneficial effect
A kind of liquid refractive index sensor based on Graphene coating inclined optical fiber grating that the present invention proposes, the change of external environment liquid refractivity is converted into the spectral signatures such as the change of grating transmission spectrum cladding mode normalized area, realizes the monitoring to liquid refractivity change by the change of measuring its spectral signature.By the modulation of Graphene coat to fibre cladding modal refractive index, expand the sensitizing range of this sensor refractive index, and move to region of low refractive index, thus avoid when adopting naked inclined optical fiber grating to measure liquid refractivity, only responsive and to the insensitive deficiency of region of low refractive index to fibre cladding refractive index near zone.In addition, this sensor also has that highly sensitive, measurement range is large, carries out direct continuous coverage under the liquid environment that is adapted at region of low refractive index.
Accompanying drawing explanation
Fig. 1 is the liquid refractive index sensor structural representation based on Graphene coating inclined optical fiber grating.
Fig. 2 is the structural representation of Graphene coating inclined optical fiber grating.
Fig. 3 is the spectrogram adopting Graphene coating inclined optical fiber grating and naked inclined optical fiber grating to respond liquid refractivity.Fig. 3 (a) and Fig. 3 (b) respectively corresponding Graphene applies the response spectrum of inclined optical fiber grating and naked inclined optical fiber grating.
Fig. 4 is when adopting Graphene coating inclined optical fiber grating and naked inclined optical fiber grating, the response of refractive index correlation curve of lower envelope normalized area on the cladding mode of its transmitted spectrum.
Wherein: 1-wideband light source; 2-single-mode fiber; 3-inclined optical fiber grating; 4-solution example to be measured; 5-sample cell; 6-spectroanalysis instrument.
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
See accompanying drawing 1, the liquid refractive index sensor based on Graphene coating inclined optical fiber grating comprises wideband light source 1, single-mode fiber 2, inclined optical fiber grating 3, sample cell 5 and spectroanalysis instrument 6.Wherein, wideband light source 1 connects inclined optical fiber grating 3 one end of Graphene coating by single-mode fiber 2, and the other end of inclined optical fiber grating 3 accesses spectroanalysis instrument 6 by single-mode fiber 2, carries out monitoring and the record of transmitted spectrum.By inject successively respectively in sample cell 5 (aperture of both sides uses the sealing of ultra-violet curing glue) there is different refractivity solution (as water and the glycerine mixed solution of variable concentrations.Sample cell can remove in liquid in-situ is measured, directly the inclined optical fiber grating containing Graphene coat is immersed in testing liquid), record different solutions refractive index situation by spectroanalysis instrument 6 to have a down dip the transmitted spectrum of fiber grating, as shown in Figure 3.By these spectroscopic datas input computer data interpretation software, by extracting the upper and lower envelope size of cladding mode and doing normalized, obtain the response curve of normalization envelope size with variations in refractive index, as shown in Figure 4.
The wideband light source 1 selected in the present embodiment is amplified spontaneous emission (ASE) light source of spectral range at 1510 ~ 1610nm, single-mode fiber 2 is conventional SMF 125 optical fiber, inclined optical fiber grating 3 (structure for amplifying schematic diagram as shown in Figure 2: wherein, 7 is fiber core, 8 is inclined optical fiber grating grid faces, 9 is fibre cladding, and 10 is Graphene coat.) grid region length be 15mm, grid face tilt angle is 6 °, its surface coating five layer graphenes (being prepared by vapour deposition process), thickness is 2nm, and spectroanalysis instrument scanning accuracy is 0.02nm.Fig. 3 gives the transmitted spectrum when inclined optical fiber grating with Graphene coat and naked inclined optical fiber grating immerse different refractivity solution respectively successively, and horizontal ordinate is optical wavelength, and ordinate is transmitted spectrum intensity.The situation of change of transmitted spectrum during in order to distinguish different external environment refractive index (SRI), the ordinate of transmission spectrum light curve be with the addition of successively to the side-play amount of 33dB, as spectrum during SRI=1.333 relative to SRI=1.000 time spectrum increase the offseting of 33dB.The inclined optical fiber grating that accompanying drawing 3 (a) applies for Graphene is to the spectral response of different refractivity, and can find out, in region of low refractive index (1 ~ 1.413), cladding mode has obvious change.Accompanying drawing 3 (b), for naked inclined optical fiber grating is to the spectral response of different refractivity, can be found out, in region of low refractive index (1 ~ 1.413), spectrum changes hardly.When fig. 4 shows the inclined optical fiber grating (curve B) and naked inclined optical fiber grating (curve A) that adopt Graphene coating, the response of refractive index curve of lower envelope normalized area on the cladding mode of its transmitted spectrum, wherein horizontal ordinate is refractive index, and ordinate is the normalized area of lower envelope on cladding mode.As can be seen from accompanying drawing 4, in region of low refractive index, on the cladding mode in naked inclined optical fiber grating transmitted spectrum, lower envelope normalized area is almost constant, and that is, naked inclined optical fiber grating to external world ambient refractive index is insensitive; But the normalized area of the inclined optical fiber grating transmitted spectrum containing Graphene coat there occurs obvious change with the change of refractive index, and this shows, the increase of Graphene coat, improves the perception of inclined optical fiber grating in region of low refractive index.Therefore, by the surperficial coated with multiple layer Graphene at inclined optical fiber grating, mobile and the expansion from high-refractive-index regions (1.413 ~ 1.462) to region of low refractive index (1 ~ 1.413) of its sensitizing range can be realized, thus, for the region of low refractive index be concerned about in biochemical sensitive field, its perception strengthens.
Claims (5)
1., based on a liquid refractive index sensor for Graphene coating inclined optical fiber grating, it is characterized in that: be made up of wideband light source (1), single-mode fiber (2), inclined optical fiber grating (3), sample cell (5) and spectroanalysis instrument (6); Wideband light source (1) is connected by single-mode fiber (2) one end with inclined optical fiber grating (3), and the other end of inclined optical fiber grating (3) is connected with spectroanalysis instrument (6) by single-mode fiber (2); Inclined optical fiber grating (3) passes from two wall apertures of sample cell (5), and is sealed by aperture by structure glue, and keeps the axis of inclined optical fiber grating to be positioned at surface level.
2. a kind of liquid refractive index sensor based on Graphene coating inclined optical fiber grating according to claim 1, is characterized in that: the grid face tilt angle of described inclined optical fiber grating (8) is 4 ~ 10 °, and length is 5 ~ 15mm.
3. a kind of liquid refractive index sensor based on Graphene coating inclined optical fiber grating according to claim 1, is characterized in that: the surface of inclined optical fiber grating is coated with the Graphene coating (10) that representative value is 5 layers, and its thickness is 2 ~ 5nm.
4. a kind of liquid refractive index sensor based on Graphene coating inclined optical fiber grating according to claim 1, it is characterized in that: described sample cell (5) is square or hydrostatic column, two opposing sidewalls has the aperture of 0.5mm, for introducing and drawing inclined optical fiber grating.
5. a kind of liquid refractive index sensor based on Graphene coating inclined optical fiber grating according to claim 1, it is characterized in that: described sample cell (5) can remove in liquid in-situ is measured, directly the inclined optical fiber grating containing Graphene coat is immersed in testing liquid, do not need liquid sampling to be injected sample cell (5).
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Cited By (13)
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| CN105486639A (en) * | 2016-01-06 | 2016-04-13 | 胡兴柳 | Conical optical fiber liquid refraction index sensing and detecting platform and use method thereof |
| CN106019468A (en) * | 2016-07-21 | 2016-10-12 | 暨南大学 | Manufacturing method of graphene oxide microstructure cladding filter based on laser reduction |
| CN106290250A (en) * | 2016-07-29 | 2017-01-04 | 天津大学 | Optical-fiber type that modified graphene strengthens is poisonous/harmful gas sensor and preparation method thereof |
| CN108072631A (en) * | 2017-12-11 | 2018-05-25 | 华侨大学 | Index sensor based on graphene heptamer method promise resonance and preparation method thereof |
| CN108548807A (en) * | 2018-03-15 | 2018-09-18 | 国家纳米科学中心 | Graphene phasmon device and preparation method thereof for enhanced highpass filtering signal |
| CN108680531A (en) * | 2018-05-22 | 2018-10-19 | 温州大学 | Titanium deoxid film coats inclined optical fiber grating index sensor and detecting system |
| CN108732101A (en) * | 2018-07-27 | 2018-11-02 | 温州大学 | Graphene integrates inclined optical fiber grating index sensor and sensitivity regulates and controls method |
| 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 |
| CN110726681A (en) * | 2019-10-28 | 2020-01-24 | 中国科学院西安光学精密机械研究所 | Integrated optical fiber Bragg grating sensor for detecting temperature, humidity and pH value |
| CN112730325A (en) * | 2020-12-23 | 2021-04-30 | 汕头大学 | Preparation method of coated optical fiber, coated optical fiber and refractive index detection device |
| CN114111858A (en) * | 2021-11-29 | 2022-03-01 | 中国地质调查局水文地质环境地质调查中心 | Optical fiber Bragg grating sensor for simultaneously measuring concentration and temperature of petroleum hydrocarbon and manufacturing method thereof |
| CN114791294A (en) * | 2022-04-29 | 2022-07-26 | 南京信息工程大学 | Optical fiber sensor and method based on Mach-Zehnder interference |
| CN117233104A (en) * | 2023-11-16 | 2023-12-15 | 宁德时代新能源科技股份有限公司 | Battery lithium separation detection method and device based on optical fiber sensor |
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Cited By (17)
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| CN105486639B (en) * | 2016-01-06 | 2019-03-19 | 金陵科技学院 | A kind of detection method using conical fiber liquid refractivity sensing detection platform |
| CN105486639A (en) * | 2016-01-06 | 2016-04-13 | 胡兴柳 | Conical optical fiber liquid refraction index sensing and detecting platform and use method thereof |
| CN106019468A (en) * | 2016-07-21 | 2016-10-12 | 暨南大学 | Manufacturing method of graphene oxide microstructure cladding filter based on laser reduction |
| CN106290250A (en) * | 2016-07-29 | 2017-01-04 | 天津大学 | Optical-fiber type that modified graphene strengthens is poisonous/harmful gas sensor and preparation method thereof |
| CN108072631A (en) * | 2017-12-11 | 2018-05-25 | 华侨大学 | Index sensor based on graphene heptamer method promise resonance and preparation method thereof |
| CN108072631B (en) * | 2017-12-11 | 2023-07-18 | 华侨大学 | Refractive index sensor based on graphene heptamer Fano resonance and manufacturing method thereof |
| CN108548807A (en) * | 2018-03-15 | 2018-09-18 | 国家纳米科学中心 | Graphene phasmon device and preparation method thereof for enhanced highpass filtering signal |
| CN108680531B (en) * | 2018-05-22 | 2020-11-03 | 温州大学 | Titania film coating inclined optical fiber grating refractive index sensor and detection system |
| CN108680531A (en) * | 2018-05-22 | 2018-10-19 | 温州大学 | Titanium deoxid film coats inclined optical fiber grating index sensor and detecting system |
| CN108732101A (en) * | 2018-07-27 | 2018-11-02 | 温州大学 | Graphene integrates inclined optical fiber grating index sensor and sensitivity regulates and controls method |
| 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 |
| CN110726681A (en) * | 2019-10-28 | 2020-01-24 | 中国科学院西安光学精密机械研究所 | Integrated optical fiber Bragg grating sensor for detecting temperature, humidity and pH value |
| CN112730325A (en) * | 2020-12-23 | 2021-04-30 | 汕头大学 | Preparation method of coated optical fiber, coated optical fiber and refractive index detection device |
| CN114111858A (en) * | 2021-11-29 | 2022-03-01 | 中国地质调查局水文地质环境地质调查中心 | Optical fiber Bragg grating sensor for simultaneously measuring concentration and temperature of petroleum hydrocarbon and manufacturing method thereof |
| CN114791294A (en) * | 2022-04-29 | 2022-07-26 | 南京信息工程大学 | Optical fiber sensor and method based on Mach-Zehnder interference |
| CN117233104A (en) * | 2023-11-16 | 2023-12-15 | 宁德时代新能源科技股份有限公司 | Battery lithium separation detection method and device based on optical fiber sensor |
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