CN105092535A - Distributed type surface plasma resonance optical fiber sensor - Google Patents
Distributed type surface plasma resonance optical fiber sensor Download PDFInfo
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- CN105092535A CN105092535A CN201510400263.6A CN201510400263A CN105092535A CN 105092535 A CN105092535 A CN 105092535A CN 201510400263 A CN201510400263 A CN 201510400263A CN 105092535 A CN105092535 A CN 105092535A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 70
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- 230000003287 optical effect Effects 0.000 claims description 26
- 239000010410 layer Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 4
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 4
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Abstract
The invention provides a distributed type surface plasma resonance optical fiber sensor. Pairing-distribution V-shaped grooves are formed on a section of twin-core optical fiber, the depth of the V-shaped grooves exceeds that of optical fiber cores, two V-shaped grooves of each pair of V-shaped grooves are in mutual dislocation arrangement, and an inclined plane of each V-shaped groove is plated with a sensing layer; in each pair of V-shaped grooves, wide-spectrum light incident from a first fiber core stimulates SPR at the inclined plane of the first V-shaped groove and generates total reflection, and the light is reflected to the inclined plane of the second V-shaped groove, also stimulates SPR and is reflected to a second fiber core; the light is transmitted successively in the pairs of the V-shaped grooves to realize distributed type sensing. The sensor can be well in low-loss connection with an all-optical-fiber system, and has the outstanding advantages of small size, simple structure and the like. According to the distributed type SPR optical fiber sensor, a plurality of groups of sensing regions are prepared on the side face of the optical fiber, the plurality of sensing regions are connected in series by the special structure of the optical fiber, and real-time multichannel distributed type measurement is achieved.
Description
Technical field
What the present invention relates to is a kind of Fibre Optical Sensor, particularly a kind of distributed SPR Fibre Optical Sensor being mainly used in the sensing measurements such as external environment refractive index, air concentration.
Background technology
Surface plasma body resonant vibration (SurfacePlasmonResonance, SPR) effect is that environmental change is highstrung to external world betides metal and the interfacial physical optics phenomenon of dielectric for one.Light wave is in metal and dielectric interface experiences total internal reflection, produce evanescent wave, evanescent wave is when incident light is equal with the wave vector of surface plasma wave along the wave vector in interface direction, cause surface plasma body resonant vibration, cause light wave produce power loss in transmitting procedure, namely in spectrum, occur the trough that significantly resonates.The change of external environment refractive index or gas concentration can cause the skew of resonance wave trough position, so by carrying out to resonance trough the sensing that Real-Time Monitoring can realize ambient refractive index or gas concentration to external world.
SPR sensing technology have highly sensitive, be easy to realize, without the need to advantages such as marks, be widely used in multiple detection field.The spr sensor realized the earliest is lens type spr sensor, but due to its have that cost is high, the application of shortcoming the limits this sensor such as system complex, volume are large, be inconvenient to carry.Doctor R.C.Jorgenson of the U.S. in 1993 proposes optical fiber SPR sensor (RalphCorleissenJorgenson.Fiber-opticchemicalsensorbasedo nsurfaceplasmonresonance.SensorsandActuator [J] s, B:Chemical, vB12, n3, Apr151993, p213-220), the new page of optical fiber SPR sensor has been started since then.Because optical fiber SPR sensor have volume little, easy of integration, not by the advantage such as mechanical vibration and light source fluctuation interference, become the main flow direction of spr sensor research at present.
Within 2003, Cao Zhen newly waits people successfully to develop genesis analysis formula SPR Fibre Optical Sensor, and applied for that (number of patent application is: 03113077.1) for the patent of invention of " Longitudianl distributive surface plasma wave sensors " by name, this genesis analysis formula SPR Fibre Optical Sensor producing principle is identical with the single channel spr sensor of traditional form, because the sensitive zones form of its optical fiber side is fixed, sensor only regulates resonant wavelength by changing thickness, the detecting light spectrum of its correspondence is the superposition that multiple incident angle tells on, cause measuring-signal half-band width and intensity all not ideal enough, the people such as Peng Wei in 2005 use core diameter to be that the multimode optical fiber of 600 μm have developed hyperchannel SPR Fibre Optical Sensor, and applied for that (number of patent application is: 201110089650.4) for the patent of invention of " angle adjustable multichannel optical fiber surface plasmon resonance sensing " by name, this SPR Fibre Optical Sensor is integrated with multiple sensing passage an optical fiber end, but it can only carry out the real-time detection of single channel, needs timesharing to detect for multiple parameter.
Summary of the invention
The object of the present invention is to provide a kind of structure simple, highly sensitive, the distributed surface plasma resonance optical fiber sensor that hyperchannel is measured in real time can be realized.
The object of the invention is to be realize like this:
One section of twin-core fiber is processed with the V-type groove of distribution in pairs, and the degree of depth of V-type groove exceedes fibre core, and two V-type groove mutual dislocation in often pair of V-type groove are arranged, the inclined-plane of V-type groove is coated with sensing layer; In often pair of V-type groove, excite SPR from the wide spectrum optical of the first fibre core incidence on the first V-type groove inclined-plane and be totally reflected, reflexing to the second V-type groove inclined-plane place and also excite SPR and reflex to the second fibre core; Light transmits successively and realizes distributed sensing in each pair of V-type groove.
The present invention can also comprise:
The magnitude of misalignment L of two V-type grooves 1, in often pair of V-type groove meets L=d*cot Φ, and wherein d is two fiber core distances, Φ is the corner angle of V-type groove.
The thickness of 2, described sensing layer is 35-65 nanometer, the material gold, silver of sensing layer, aluminium or copper.
The invention provides a kind of structure simple, highly sensitive, the distributed SPR Fibre Optical Sensor that hyperchannel is measured in real time can be realized.One section of twin-core fiber 1 side is processed with many group V-type grooves to 2, V-type groove is coated with sensing layer 3 on the inclined-plane of 2, excite SPR from the wide spectrum optical of the first fibre core 4 incidence on the first V-type groove inclined-plane 5 and be totally reflected, because two the V-type angle of the v-grooves misplacing relative are identical, therefore light can reflex to the second V-type groove inclined-plane 6 place, also can excite SPR and reflex to the second fibre core 7, the like realize distributed sensing.Two fiber core distances of twin-core fiber 1 are d.Often organizing V-type groove, to have equal angular Φ, magnitude of misalignment L to 2 by two be that the V-type groove of d*cot Φ forms, and the degree of depth of V-type groove exceedes fibre core.V-type groove can have identical angle to 2, also can have different angles, but should meet the angle conditions of excitation SPR.Sensing layer) different V-type groove to 2 on can have same thickness, also can have different-thickness, but the V-type groove with equal angular is to 2, should be coated with the sensing layer 3 of different-thickness.The gold, silver of sensing layer 3 can be thickness be 35-65 nanometer, aluminium or copper also can be that other can encourage the material of SPR.
Its principle of work is:
As shown in Figure 3, SPR sensing principle be incident field with metal/optical medium for incentive structure, be totally reflected at medium and metal film interface, produce evanescent wave, the wave vector K of evanescent wave
eWwith the wave vector K of metal surface plasma bulk wave
spzwhen matching, two kinds of mode of electromagnetic waves can be coupled strongly, cause the energy of a part of incident light to be absorbed by surface plasma wave, cause the intensity of reflected light obviously to reduce.Spr sensor realizes the detection to outside environment parameter based on this phenomenon just.
SPR wave vector matching formula is:
In formula, ω is optical frequency, and c is the light velocity, and θ is incident angle, ε
0, ε
1, ε
2, be respectively the specific inductive capacity of waveguide medium, metal film, testing medium, Δ k is the wave vector amount of mismatch that material causes.
In optical fiber SPR sensor, optical fiber to combine with metal film as optical medium and defines the perturbed surface of SPR effect, and in distributed SPR Fibre Optical Sensor, the V-shaped groove inclined-plane being coated with sensing layer is exactly the perturbed surface of SPR effect.Wide spectrum optical is radiated on the inclined-plane of V-type groove, when the incident angle (V-type groove bevel angle) of light, the thickness of sensing layer and surrounding medium refractive index are suitable, and light experiences total internal reflection produce evanscent field on inclined-plane, and make K
eWwith K
spzmatch, produce SPR effect, the energy of surface plasma wave meeting absorption portion incident light, causes the light intensity of a certain wavelength obviously to reduce.Light is through too much organizing V-type groove pair, light is alternately propagated in two fibre cores, because different V-type grooves is to the sensing layer on the inclined-plane or different-thickness with different angles, outgoing spectrum there will be many places and absorbs paddy, when changing extraneous a certain medium refraction index, corresponding spectral absorption paddy has obvious movement, can judge the change of medium refraction index according to the change of spectrum, many groups V-type groove on same sensor to realizing multichannel Real-Time Monitoring, i.e. distributed sensing.
Compared with prior art, advantage of the present invention is:
1, The present invention gives a kind of distributed SPR Fibre Optical Sensor based on twin-core fiber of novelty, this sensor can be good at carrying out low-loss with all optical fiber system and is connected, and has volume little, and structure simply waits outstanding advantages.
2, distributed SPR Fibre Optical Sensor makes at optical fiber side and organizes sensing unit more, utilizes the special construction of optical fiber to be connected multiple sensing unit, achieves real-time hyperchannel distributed measurement.
Accompanying drawing explanation
Fig. 1 is distributed SPR Fibre Optical Sensor three-dimensional structure schematic diagram.
Fig. 2 is distributed SPR Fibre Optical Sensor light path schematic diagram.
Fig. 3 is KretschnLann three layer medium waveguide illustraton of model.
Embodiment
Illustrate below and the present invention is described in more detail.
As shown in Figure 1, a kind of distributed SPR Fibre Optical Sensor comprises one section of twin-core fiber 1, the cladding diameter of twin-core fiber 1 is 125 microns, has two symmetrical fibre cores in covering, and two core diameters are 6-10 micron, the center distance d of fibre core is 30-100 micron.Twin-core fiber 1 side has two or more V-type groove to 2, the V-type angle of the v-groove often organizing V-type groove centering is Φ, magnitude of misalignment L is d*cot Φ, the bevel angle of V-type groove should be able to practical requirement meet light total internal reflection condition, the inclined-plane of V-type groove should be coated with the sensing layer 3 of 35-65 nanometer thickness; The degree of depth of V-type groove should cross corresponding fibre core 1-10 micron.Other multi-core fibers that SPR Fibre Optical Sensor in the present invention also can select fiber core symmetrical, its two symmetrical fibre cores should meet the basic distribution occasion of above-mentioned twin-core fiber 1 fibre core.
The concrete method for making of distributed SPR Fibre Optical Sensor of the present invention is: utilize femto-second laser to make distributed SPR Fibre Optical Sensor.Step is as follows:
1, predispersed fiber process: get the twin-core fiber 1 that one section of diameter is 125 microns, uses Miller pincers at a certain position peeling optical fibre coat 25 millimeters of optical fiber and is cleaned up by exposed fibre cladding with alcohol.
2, twin-core fiber 1 is placed on the fixed mount of femto-second laser, makes the exposed part of optical fiber be in the workspace of laser instrument, and ensure that two fibre core place plane orthogonal of optical fiber are in surface level.
3, use femto-second laser in twin-core fiber 1 side naked fibre place programming first V-type groove, fiber core distance due to twin-core fiber 1 is 35 microns, the V-type angle of the v-groove is 150 °, V-type groove magnitude of misalignment L controls at 60 microns by first group as calculated, V-type groove crosses fibre core about 10 microns, for making surface plasma body resonant vibration wavelength be 650 ran, therefore apart from the first V-type groove 40 microns and closer to position programming second V-shaped groove of light end.
4, repeat step 1,2,3 according to identical principle, programming completes other V-type grooves to 2.
5, the V-type groove region on deionized water and ultrasonic cleaners cleaning optical fiber is used.
6, make V-type groove upwards, optical fiber is fixed on microslide, use sputter coating technology plated film 3.5 minutes, make the golden film inclined-plane of V-type groove being coated with 50 nanometer thickness.
7, repeat step 6, each V-shaped groove is coated with golden film.
8, the V-type groove of twin-core fiber 1 be placed in U-shaped quartz cell to 2 parts and use epoxy resin to fix, namely forming distributed SPR Fibre Optical Sensor.
Distributed SPR Fibre Optical Sensor is utilized to realize the measurement of liquid refractivity.Step is as follows:
1, a segment standard single-mode fiber and a distributed SPR Fibre Optical Sensor completed is got, Miller pincers are used to remove optical fiber two ends coat about 30 millimeters and cleaned up by exposed fibre cladding with alcohol, use optical fiber cutter to cut at optical fiber two ends, the two ends end face of optical fiber is formed perpendicular to shaft axis of optic fibre and smooth section.
2, utilize optical fiber splicer to make the first fibre core of the fibre core of single-mode fiber and twin-core fiber 1 just right, use suitable welding current to be welded together by two optical fiber.
3, the pad of two optical fiber is placed in thermoplastic tube sealing, to the heating of thermoplastic tube sealing, guarantees that solder joint can obtain good protection.
4, use spectral range is the super continuum source of 400 ~ 1200 nanometers, is injected in single-mode fiber by the light that light source exports.
5, OSA spectrometer is accessed in one end of not welding of twin-core fiber 1, and the detection wavelength coverage adjusting spectrometer is 400 ~ 1200 nanometers.
6, the transducing part (V-type groove is to (2)) of sensor is put into the testing liquid that refractive index is about 1.333 (distilled water).
7, connect light source, the transmitted spectrum of observation sensor, due to the generation of SPR phenomenon, there will be obviously weakening of some wavelength light intensity in spectrum.
8, utilize the method dripping glycerine in water to change the refractive index of testing liquid, by the knots modification of observation spectrum, just can extrapolate the refractive index variable quantity of testing liquid.
Claims (3)
1. a distributed surface plasma resonance optical fiber sensor, it is characterized in that: the V-type groove being processed with distribution in pairs on one section of twin-core fiber, the degree of depth of V-type groove exceedes fibre core, and two V-type groove mutual dislocation in often pair of V-type groove are arranged, the inclined-plane of V-type groove is coated with sensing layer; In often pair of V-type groove, excite SPR from the wide spectrum optical of the first fibre core incidence on the first V-type groove inclined-plane and be totally reflected, reflexing to the second V-type groove inclined-plane place and also excite SPR and reflex to the second fibre core; Light transmits successively and realizes distributed sensing in each pair of V-type groove.
2. distributed surface plasma resonance optical fiber sensor according to claim 1, is characterized in that: the magnitude of misalignment L of two V-type grooves in often pair of V-type groove meets L=d*cot Φ, and wherein d is two fiber core distances, Φ is the corner angle of V-type groove.
3. distributed surface plasma resonance optical fiber sensor according to claim 1 and 2, is characterized in that: the thickness of described sensing layer is 35-65 nanometer, the material gold, silver of sensing layer, aluminium or copper.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866070A (en) * | 2016-05-27 | 2016-08-17 | 哈尔滨工程大学 | Distributed liquid refractive index sensing device based on optical fiber surface plasma resonance |
| CN105954231A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工程大学 | Hole-assisted dual-core optical fiber sensor based on mode coupling mechanism |
| CN105954235A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工程大学 | Hole-assisted dual-core optical fiber interferential refractive index sensor |
| CN106066313A (en) * | 2016-05-25 | 2016-11-02 | 哈尔滨工程大学 | Distributed surface plasma resonance optical fiber sensor and the method for measuring refractive indexes of liquid |
| CN106289340A (en) * | 2016-11-02 | 2017-01-04 | 中国计量大学 | A kind of multichannel light fiber sensor based on TFBG SPR |
| CN106525775A (en) * | 2016-10-20 | 2017-03-22 | 重庆三峡学院 | Multichannel SPR sensor for single-mode fiber and multi-mode fiber cascade application |
| CN108414453A (en) * | 2018-01-23 | 2018-08-17 | 大连理工大学 | A kind of multichannel optical fiber SPR system of comprehensive time division multiplexing and wavelength-division multiplex technique |
| CN110132893A (en) * | 2019-05-16 | 2019-08-16 | 西安柯莱特信息科技有限公司 | A kind of gas detector based on optical fiber structure |
| CN112432929A (en) * | 2020-12-08 | 2021-03-02 | 桂林电子科技大学 | V-groove structure plastic optical fiber SPR sensor and preparation method thereof |
| CN112461795A (en) * | 2020-12-08 | 2021-03-09 | 桂林电子科技大学 | Plastic optical fiber SPR array sensor and preparation method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954235B (en) * | 2016-04-26 | 2018-12-07 | 哈尔滨工程大学 | A kind of hole helps twin-core fiber interference-type index sensor |
| CN105954231A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工程大学 | Hole-assisted dual-core optical fiber sensor based on mode coupling mechanism |
| CN105954235A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工程大学 | Hole-assisted dual-core optical fiber interferential refractive index sensor |
| CN105954231B (en) * | 2016-04-26 | 2018-10-26 | 哈尔滨工程大学 | A kind of hole based on Mode Coupling mechanism helps twin-core fiber sensor |
| CN106066313A (en) * | 2016-05-25 | 2016-11-02 | 哈尔滨工程大学 | Distributed surface plasma resonance optical fiber sensor and the method for measuring refractive indexes of liquid |
| CN105866070A (en) * | 2016-05-27 | 2016-08-17 | 哈尔滨工程大学 | Distributed liquid refractive index sensing device based on optical fiber surface plasma resonance |
| CN106525775A (en) * | 2016-10-20 | 2017-03-22 | 重庆三峡学院 | Multichannel SPR sensor for single-mode fiber and multi-mode fiber cascade application |
| CN106289340A (en) * | 2016-11-02 | 2017-01-04 | 中国计量大学 | A kind of multichannel light fiber sensor based on TFBG SPR |
| CN108414453A (en) * | 2018-01-23 | 2018-08-17 | 大连理工大学 | A kind of multichannel optical fiber SPR system of comprehensive time division multiplexing and wavelength-division multiplex technique |
| CN108414453B (en) * | 2018-01-23 | 2020-09-11 | 大连理工大学 | Multi-channel optical fiber SPR system integrating time division multiplexing and wavelength division multiplexing technologies |
| CN110132893A (en) * | 2019-05-16 | 2019-08-16 | 西安柯莱特信息科技有限公司 | A kind of gas detector based on optical fiber structure |
| CN112432929A (en) * | 2020-12-08 | 2021-03-02 | 桂林电子科技大学 | V-groove structure plastic optical fiber SPR sensor and preparation method thereof |
| CN112461795A (en) * | 2020-12-08 | 2021-03-09 | 桂林电子科技大学 | Plastic optical fiber SPR array sensor and preparation method thereof |
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