CN205175909U - Surface plasma resonance refracting index sensor based on optic fibre encircles a little - Google Patents
Surface plasma resonance refracting index sensor based on optic fibre encircles a little Download PDFInfo
- Publication number
- CN205175909U CN205175909U CN201520877006.7U CN201520877006U CN205175909U CN 205175909 U CN205175909 U CN 205175909U CN 201520877006 U CN201520877006 U CN 201520877006U CN 205175909 U CN205175909 U CN 205175909U
- Authority
- CN
- China
- Prior art keywords
- fibre core
- air ring
- sensing unit
- optoisolator
- polarization controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model provides a surface plasma resonance refracting index sensor based on optic fibre encircles a little, its characteristic includes broadband light source, optical isolator, polarization controller, 3 port circulators, sensing district, spectrum appearance, the sensing district produces the air ring in the covering of careful optic fibre, plate one deck gold membrane at air ring lateral wall, in addition, plates one deck gold filming reflection sensor at the fiber end face, sensing district by interior be the fibre core in proper order outside to, near surplus covering, air bed, metal level, the surrounding layer of fibre core, owing to the influence that very easily receives the surrounding medium environment at the surperficial surperficial plasma resonance effect who arouses of metallic film, so pour into the material of different refracting indexes to the air in encircling into, the position of formant can change, through the position change of monitoring formant, can realize the measurement of material refracting index. The utility model discloses practical, anti external disturbance can the reinforce, sensitivity is high, and in addition, the reflection sensor makes the double reinforcing of resonance effect, easily monitoring.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, particularly a kind of surface plasma body resonant vibration (SurfacePlasmonResonance, SPR) index sensor based on the micro-ring of optical fiber.
Background technology
Surface plasma body resonant vibration (SurfacePlasmonResonance is called for short SPR) is a kind of optical physics phenomenon.When the P type polarization polychromatic light that light source sends enters optically thinner medium generation total reflection with a certain incident angle by optically denser medium, have a small part incident light and penetrate into golden film certain depth and exponentially decay, this part light is called evanescent wave.Evanescent wave excites the free electron be confined on metal surface, the interface of metallic film and surrounding medium forms a kind of electromagnetic wave of decaying along Z-direction, is called surface plasma wave (Surfaceplasmawave, SPW).When the wave vector of component and surface plasma wave that evanescent wave is parallel to metal/dielectric interface is mated completely, strong coupling can be there is in two kinds of mode of electromagnetic waves, produce SPR effect, the energy of portion of incident light will be absorbed by SPW, thus cause the minimizing rapidly of this wavelength region luminous energy, produce SPR resonance peak.
Nineteen sixty-eight, propose the surface plasma body resonant vibration model based on light prism first, observed SPR effect.The method of attenuated total reflection (AttenuatedTotalReflection is called for short ATR) was adopted to achieve exciting of the surface plasma of optical frequency wave band in an experiment afterwards.1993, the people such as Jorgenson successfully developed optical fiber SPR sensor, were that the spr sensor of carrier obtains concern with optical fiber.Compared to glass prism SPR sensor, it have highly sensitive, integration good, volume is little, anti-electromagnetic interference capability is strong, it is long apart from plurality of advantages such as online real-time monitored to be easy to realize, detect at food security monitoring, chemical molecular, the association area such as Pharmaceutical Analysis and environmental monitoring have broad application prospects.
Usually based on the surface plasma resonance sensor of optical fiber; that the covering of optical fiber is eroded; plate layer of metal film outward at fiber core, or fibre-optical drawing is become very thin cone then at the outside plated film of cone, realize evanescent wave in optical fiber and metal film and interact and produce SPR and resonate.This based on corrosion and the sensor drawing cone technology, easily broken in actual measurement uses, cause the wasting of resources; In addition, the spr sensor major part up to the present proposed is all transmission-type.A kind of surface plasma resonance refractive index sensor based on the micro-ring of optical fiber that the utility model proposes, produce air ring in careful fibre cladding, then one deck gold film is plated at air ring lateral wall, in addition, plate one deck gold film at sensing head end face and form reflection sensor, only sensing head need be inserted test substance, treat test sample material can automatic filling in the air ring of covering, carry out the sensing measurement of liquid, gas material, be convenient to realize Real-Time Monitoring, and sensing head is without cone district, durable.
Summary of the invention
The purpose of this utility model is to provide a kind of surface plasma resonance refractive index sensor based on the micro-ring of optical fiber.The variable quantity of material refractive index can be converted into the change of resonant wavelength by this device.Have structure simple, be easy to operation, the feature such as highly sensitive, practical.
The technical scheme that the utility model is taked for technical solution problem:
A kind of surface plasma resonance refractive index sensor based on the micro-ring of optical fiber, comprise wideband light source, optoisolator, Polarization Controller, 3 port circulators, sensing unit, spectrometer, it is characterized in that: the output terminal of wideband light source is connected with optoisolator, the output terminal of optoisolator is connected with Polarization Controller, the output terminal of Polarization Controller is connected with one end of 3 port circulators, and the another two ends of 3 port circulators are connected with spectrometer with sensing unit respectively; Described sensing unit produces air ring in the covering of careful optical fiber, plates one deck gold film at air ring lateral wall, in addition, plates one deck gold film form reflection sensor at fiber end face; Sensing unit is residue covering, air layer, metal level, the surrounding layer of fibre core, close fibre core from inside to outside successively, the radius of fibre core is 3.5 ~ 4.0um, the residue cladding thickness of close fibre core is between 10nm ~ 150nm, the thickness of air ring is between 10nm ~ 50nm, gold film thickness is between 30nm ~ 70nm, and the root mean square of surfaceness is less than or equal to 5nm; P polarized light is produced by wideband light source, optoisolator and Polarization Controller structure.
The beneficial effects of the utility model are:
A kind of surface plasma resonance refractive index sensor based on the micro-ring of optical fiber that the utility model proposes, produce air ring in careful fibre cladding, then plate one deck gold film at air ring lateral wall, in addition, plate one deck gold film at fiber end face and form reflection sensor.The design of this special construction can effectively excite SPR effect, only sensing head need be inserted test substance, treat test sample material can automatic filling in the air ring of covering, the change of material refractive index can cause the change of air ring refractive index, SPR spectrum is changed, owing to being reflection sensor, light passes twice through the interface of golden film and material, make the double enhancing of SPR effect, changed by the position detecting a wavelength range internal resonance wavelength, the measurement of refractive index can be realized; In addition, the structure of this sensor is without cone district, and sensing head is durable.
Accompanying drawing explanation
Fig. 1 is a kind of surface plasma resonance refractive index sensor structural representation based on the micro-ring of optical fiber of the present utility model.
Fig. 2 is the sensing unit cross sectional representation of a kind of surface plasma resonance refractive index sensor based on the micro-ring of optical fiber of the present utility model.
SPR spectrogram when Fig. 3 is measurement different refractivity material of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, based on an index sensor for the surface plasma body resonant vibration of the micro-ring of optical fiber, comprising: by wideband light source (1), optoisolator (2), Polarization Controller (3), 3 port circulators (4), sensing unit (5), spectrometer (6); The output terminal of wideband light source (1) is connected with optoisolator (2), the output terminal of optoisolator (2) is connected with Polarization Controller (3), the output terminal of Polarization Controller (3) is connected with the A port of 3 port circulators (4), and B, C port of 3 port circulators (4) is connected with spectrometer (6) with sensing unit (5) respectively; Described sensing unit (5) produces air ring in careful fibre cladding, then plates one deck gold film at air ring lateral wall, in addition, plates one deck gold film (f) form reflection sensor at fiber end face; Sensing unit (5) is residue covering (b), air layer (c), metal level (d), the surrounding layer (e) of fibre core (a), close fibre core from inside to outside successively, the radius of fibre core is 3.5 ~ 4.0um, the residue cladding thickness of close fibre core is between 10nm ~ 150nm, the thickness of air ring is between 10nm ~ 50nm, gold film thickness is between 30nm ~ 70nm, and the root mean square of surfaceness is less than or equal to 5nm; P polarized light is produced by LASER Light Source (1), optoisolator (2) and Polarization Controller (3) structure.
Working method of the present utility model is: wideband light source (1) produces flashlight, optoisolator (2) is input to by single-mode transmission optical fiber, the light signal that optoisolator (2) exports controls output by Polarization Controller (3) and becomes P polarized light, P polarized light is inputted by the A port of 3 port photocirculators (4), B port outputs to sensing unit (5), sensing unit (5) is due to the reduction of extramural cladding thickness, core mode portion of energy is coupled in air ring with the form of evanescent wave to be transmitted, SPR effect is there is in the evanescent wave in air ring and metal surface plasma bulk wave at the gold-plated membrane interface place of ring lateral wall, light reflects when propagating into gold-plated film (f) place of end face institute, when again passing through golden membrane interface, SPR effect doubles.The sensing unit (5) be made up of with extramural cladding (e) fibre core (a), residue covering (b) near fibre core, air layer (c), metal level (d) is very responsive to the change of refractive index in air layer, along with the material of different refractivity passes into air ring, the resonance wavelength producing SPR effect changes and is exported by spectrometer (6), by detecting the drift value of resonant wavelength, the measurement of highly sensitive material refractive index can be realized.
The gordian technique that this device can realize a kind of surface plasma resonance sensor refractometry based on the micro-ring of optical fiber has:
Fibre Optical Sensor plot structure: produce air ring in the covering of careful optical fibre optical fibre, plating the sensing unit structure that forms of one deck gold film at air ring lateral wall is the basis realizing refractive index sensing.The each parameter of sensor: fiber core radius is 3.5 ~ 4.0um; The thickness of fibre core residue covering should control between 50nm ~ 200nm; The thickness of air ring should control between 10nm ~ 50nm; The thickness of gold film should strictly between control 30nm ~ 70nm, and the root mean square of the roughness on golden film surface should be less than or equal to 5nm.
In a specific embodiment of the present utility model, use finite element analysis software method to carry out theoretical values research to the sensing characteristics of this sensor, have studied each structure parameter of optical fiber to the affecting laws of sensor characteristic.Be within the scope of 400 ~ 1400nm at measurement wavelength, each parameter: fiber core radius is 3.5um, near fibre core residue covering 50nm, air ring thickness 50nm, golden film thickness 50nm, obtain the curve of SPR resonant wavelength with test substance variations in refractive index as Fig. 3.Can find out when refractive index is 1.0, be there occurs SPR resonance near 800nm, and along with the increase of test substance refractive index, resonant wavelength moves to shortwave direction at wavelength.Near refractive index 1.0, the sensitivity of sensor can reach 2000nm/RIU.
Shown in the above and figure is only preferred implementation of the present utility model.Those of ordinary skill in the art, under the prerequisite not departing from principle of the present utility model, can also make some modification and improvement, and these also should be considered as belonging to protection domain of the present utility model.
Claims (1)
1., based on a surface plasma resonance refractive index sensor for the micro-ring of optical fiber, comprise wideband light source, optoisolator, Polarization Controller, 3 port circulators, sensing unit, spectrometer, it is characterized in that:
The output terminal of wideband light source is connected with optoisolator, and the output terminal of optoisolator is connected with Polarization Controller, and the output terminal of Polarization Controller is connected with one end of 3 port circulators, and the another two ends of 3 port circulators are connected with spectrometer with sensing unit respectively; Described sensing unit produces air ring in the covering of careful optical fiber, plates one deck gold film at air ring lateral wall, in addition, plates one deck gold film form reflection sensor at fiber end face; Sensing unit is residue covering, air layer, metal level, the surrounding layer of fibre core, close fibre core from inside to outside successively, the radius of fibre core is 3.5 ~ 4.0um, the residue cladding thickness of close fibre core is between 10nm ~ 150nm, the thickness of air ring is between 10nm ~ 50nm, gold film thickness is between 30nm ~ 70nm, and the root mean square of surfaceness is less than or equal to 5nm; P polarized light is produced by wideband light source, optoisolator and Polarization Controller structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520877006.7U CN205175909U (en) | 2015-11-05 | 2015-11-05 | Surface plasma resonance refracting index sensor based on optic fibre encircles a little |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520877006.7U CN205175909U (en) | 2015-11-05 | 2015-11-05 | Surface plasma resonance refracting index sensor based on optic fibre encircles a little |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205175909U true CN205175909U (en) | 2016-04-20 |
Family
ID=55739885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520877006.7U Expired - Fee Related CN205175909U (en) | 2015-11-05 | 2015-11-05 | Surface plasma resonance refracting index sensor based on optic fibre encircles a little |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205175909U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632659A (en) * | 2019-01-04 | 2019-04-16 | 京东方科技集团股份有限公司 | A kind of detector and detection method |
| CN111307763A (en) * | 2020-04-29 | 2020-06-19 | 东北石油大学 | Hollow double-core inner and outer thin cladding surface double-side coating PCF-SPR probe |
| CN112305318A (en) * | 2020-11-24 | 2021-02-02 | 桂林电子科技大学 | Relative dielectric constant measuring system based on SPR principle |
-
2015
- 2015-11-05 CN CN201520877006.7U patent/CN205175909U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632659A (en) * | 2019-01-04 | 2019-04-16 | 京东方科技集团股份有限公司 | A kind of detector and detection method |
| CN109632659B (en) * | 2019-01-04 | 2022-07-05 | 京东方科技集团股份有限公司 | Detector and detection method |
| CN111307763A (en) * | 2020-04-29 | 2020-06-19 | 东北石油大学 | Hollow double-core inner and outer thin cladding surface double-side coating PCF-SPR probe |
| CN111307763B (en) * | 2020-04-29 | 2023-02-24 | 东北石油大学 | Hollow double-core inner and outer thin cladding surface double-side coating PCF-SPR probe |
| CN112305318A (en) * | 2020-11-24 | 2021-02-02 | 桂林电子科技大学 | Relative dielectric constant measuring system based on SPR principle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104215610B (en) | Plasma resonance chamber-based fiber surface plasma sensor | |
| Tian et al. | All-solid D-shaped photonic fiber sensor based on surface plasmon resonance | |
| CN105277513A (en) | Surface plasmon resonance refraction index sensor based on optical fiber micro-rings | |
| CN109187440B (en) | Single-mode-few-mode/multi-mode fiber SPR sensor based on mode excitation | |
| CN106841108B (en) | A kind of adjustable optical fiber SPR sensor of fiber core refractive index and preparation method thereof | |
| CN109358038A (en) | Microstructured optical fibers surface plasma body resonant vibration Multifunction Sensor and preparation method thereof | |
| Verma et al. | Modeling of tapered fiber-optic surface plasmon resonance sensor with enhanced sensitivity | |
| CN205175909U (en) | Surface plasma resonance refracting index sensor based on optic fibre encircles a little | |
| CN105092536A (en) | Multimode-single- fiber surface plasma mode structured optical resonance sensor and detection method thereof | |
| CN104596992A (en) | Maximally tilted fiber bragg grating SPR (Surface Plasmon Resonance) biochemical sensor and manufacture method thereof | |
| Zhang et al. | A surface plasmon resonance sensor based on a multi-core photonic crystal fiber | |
| EP2041555A2 (en) | Fibre grating surface plasmon sensor | |
| CN104165684B (en) | Surface plasmon resonance-based supersensitive hydrophone | |
| CN103969221A (en) | Optical fiber refractive index sensor based on single mode-fine core-multimode-single mode structure | |
| CN110927113A (en) | Fiber integrated hydrogen sensor and manufacturing method thereof | |
| CN205656127U (en) | Reflective SPR refracting index sensor based on tapered fiber long period grating | |
| CN205317669U (en) | Hydrogen sensing device based on side is thrown and is ground gradient index fiber | |
| CN203965028U (en) | Ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration | |
| CN204255857U (en) | Based on the index sensor of the high sensitivity Wide measuring range of SPR | |
| Bing et al. | Theoretical and experimental researches on a PCF-based SPR sensor | |
| CN105911026A (en) | Terminal reflection type spiral core fiber surface plasma resonance sensor | |
| CN105548078A (en) | Hydrogen sensing device based on side-polished graded-index optical fiber | |
| CN110308115A (en) | A kind of interference-type optical fiber spr sensor | |
| Bhatia et al. | Surface plasmon resonance based fiber optic hydrogen sensor utilizing wavelength interrogation | |
| Zhao et al. | Numerical investigation into a surface plasmon resonance sensor based on optical fiber microring |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 310018, No. 258, source street, Xiasha Higher Education Park, Hangzhou, Zhejiang Patentee after: China Jiliang University Address before: 310018, No. 258, source street, Xiasha Higher Education Park, Hangzhou, Zhejiang Patentee before: China Jiliang University |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210324 Address after: 114001, No. 368, Qianshan Road, hi tech Zone, Liaoning, Anshan Patentee after: ANSHAN FENGLAN TECHNOLOGY Co.,Ltd. Address before: 310018, No. 258, source street, Xiasha Higher Education Park, Hangzhou, Zhejiang Patentee before: China Jiliang University |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Bu Zehua Document name: Refund approval notice |
|
| 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: 20160420 Termination date: 20211105 |