CN110376161A - A kind of D type the interferometric optical fiber sensor of photon crystal optical fibre device using double loss blob detections - Google Patents
A kind of D type the interferometric optical fiber sensor of photon crystal optical fibre device using double loss blob detections Download PDFInfo
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Abstract
The invention discloses a kind of D type the interferometric optical fiber sensor of photon crystal optical fibre devices using double loss blob detections, including base material, covering airport, metal film, test analyte liquid and perfect domination set.Base material is quartz；Covering airport in upper and lower five layers of arranged in parallel 25 airport and the 1 big airport below the optical fiber center of circle by forming.The present invention deposited one layer of golden film on the burnishing surface of D-type optical fiber, the induced material occurred as surface plasmon resonance effect；Outermost layer is fluid analysis object, sensor using when require for optical fiber to be fully immersed in test analyte.Implement in operation specific, this sensor can detect test analyte using two loss peaks, and different types of spectral detector can also be flexibly chosen for specific experiment condition and application demand or chooses one of those come any from two loss peaks and unimodal is detected.
Description
Technical field
The present invention relates to sensory field of optic fibre, especially a kind of D type photonic crystal fiber using double loss blob detections is rolled over
Penetrate rate sensor.
Background technique
When light transmits in a fiber, understand some light causes the light transmitted in fibre core to generate from fibre core to covering leakage
Loss has directional couple effect between the optical mode of fibre core transmission and occurs and cause in certain wavelength when meeting certain condition
Place generates apparent loss peak, and optical fiber can be made to the photons device such as optical filter, beam splitter or sensor using this phenomenon
Part.But be generally possible to detection when carrying out fiber parametric amplification using the loss peak that this directional couple effect generates is high folding
The area She Shuai, and sensing sensitivity is low, and be then more difficult to form effective loss peak phenomenon in low-index regions.In order to solve this
A problem, people introduce metal in the structure design of fibre optical sensor, and utilize and occur on the surface etc. of metal surface
Gas ions polarize (Surface plasmon polarization, SPP) effect to improve sensor performance.
Surface plasma body resonant vibration (Surface plasmon resonance, SPR) is a kind of occurs in metal medium table
The physical optics phenomenon in face.When meeting phase-matching condition, evanescent wave can resonate with surface plasma wave, will lead to
The light energy transmitted in fibre core is largely coupled in surface plasma wave, leads to the sharply decline of fibre core light energy, thus
Occurs loss formant on the loss spectra of the light transmitted in fibre core.SPR phenomenon can significantly improve the intensity of loss peak, improve
The position of loss peak and the sensitivity etc. for improving sensor, and this processing method had become current optical fiber sensor already and had set
One of meter mainstream means, also have become the research hotspot of industry, application prospect is very extensive.
Be otherwise known as photonic crystal fiber (Photonic Crystal Fibers, PCF) porous optical fiber or microstructured optical fibers
(Micro-Structured Fibers, MSF) generally can be divided into refractive index light-conducting type according to its leaded light mechanism and band gap guide
Type optical fiber etc..Optical fiber used in the present invention is refractive-index-guiding type optical fiber, is mainly characterized by the rounded optical fiber structure in end face,
By introducing airport in the covering of optical fiber, to generate the refringence between covering and fibre core, so that light can be complete
It is maintained in fibre core and is propagated under the action of internal reflection.Meanwhile porous structure design is also to carry out in the stomata of optical fiber
The coating filling of golden film or metal bar lays the foundation.In addition, using to optical fiber polishing and grinding technique can also be by circle
D-type optical fiber is made in shape optical fiber, and the coating of golden film is then carried out on burnishing surface, the photonic device based on D-type optical fiber is made,
This device is since the metal coating on burnishing surface can better contact with testing liquid, so effect is often more preferable.This
It is also one of the hot fields of current research.
SPR from be reported develop till now very rapidly, be also widely used in optical fiber sensing technology.
Wood reports SPR phenomenon within 1902, however does not cause the concern of researcher at that time.Until nineteen fifty-nine, researcher's hair
The generation of existing SPR is inevitable related with metal medium.Nineteen sixty Stern etc. is directed to SPR phenomenon, proposes surface plasma wave
(SPW) concept.Nineteen sixty-eight Otto devises the Otto model of prism-coupled mode according to the shooting condition of SPR；The same year,
The Kretschmann model by prism and golden film in such a way that fully reflecting surface realizes prism-coupled such as Kretschmann, golden film
With a thickness of 10-100nm.Above two prism model is that the research and development of spr sensor provides the foundation, and researcher exists
A large amount of improvement experiment has been carried out on the basis of Kretschmann model.SPR principle is applied to pass by nineteen eighty-two Nylander etc.
Sense field, and propose the spr sensor for gas detection.Hereafter, it is constantly reported out about the research of SPR sensorgram technology
Come.With going deep into for SPR sensorgram technical research, nineteen ninety Sweden Biacore AB company researches and develops the platform prism-type commercialization SPR that informs against
Biosensor.However, the volume of optical component is larger in prism-type spr sensor, the price of instrument and kit is very high
Expensive, the mechanical structure of instrument is affected to signal, needs the components such as large volume of mechanical angle turntable, cannot achieve distant
It surveys.Therefore, based on the superiority of optical fiber technology, the combination of SPR sensorgram and optical fiber technology causes the great interest of researcher.
The thought of SPR sensorgram is realized in the propositions such as nineteen ninety Villuendas with optical fiber structure.Jorgenson in 1993 etc. is former by SPR
It ought to be used for fibre-optical sensing device, replace prism fully reflecting surface to excite using the total reflection of fiber core and covering interface
SPR phenomenon is completed the SPR sensorgram technology of wavelength modulation using fibre core as matrix, realizes optical fiber SPR sensor, mention simultaneously
On-line normalization type and end reflection type optical fiber SPR sensor are gone out.Relative to prism-type spr sensor, optical fiber SPR sensor tool
There is small in size, at low cost and real-time telemetry, overcomes the limitation of traditional SPR sensorgram technology, while passing but also with optical fiber
The corrosion-resistant of sense technology, high temperature resistant, electromagnetism interference, passive, easy flexing and highly sensitive (such as optical fiber senses to SPR effect
Refractive index resolution be 1 × 10-6RIU) the features such as.Hereafter, optical fiber sensing technology has obtained extensive research, develops fast
Speed.
It should be pointed out that current SPR fibre optical sensor foundation is all partial loss consumption blob detection, this detection means is very
It is good but and it is imperfect, such as there are loss peak detection spectral region can not be selected, unimodal detection accuracy and identification are low the problems such as.Cause
This, developing again on existing Research foundation a kind of can overcome the new detection technique of existing detection technique weakness just to seem ten
Divide necessity.
Summary of the invention
It, can be with it is an object of that present invention to provide a kind of stable structure in order to solve the deficiencies in the prior art mentioned above
With the D type the interferometric optical fiber sensor of photon crystal optical fibre device for the completely new double loss blob detections for being different from current unimodal detection.
Specifically, the present invention provides a kind of D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections comprising
Base material, covering airport, golden film, test analyte liquid and perfect domination set；
The covering airport includes inner air hole and five layers of airport that the inner air hole periphery is arranged in, institute
The lower section that inner air hole is located at the optical fiber center of circle is stated, the aperture in the inner air hole is greater than the aperture of five layers of airport, described
Five layers of airport include that first layer airport, second layer airport, third layer airport, the 4th layer of airport and layer 5 are empty
Stomata, wherein the aperture of second layer airport, third layer airport, the 4th layer of airport and layer 5 airport it is equal and
Greater than the aperture of first layer airport,
The first layer airport include seven airports, the center of circle of the airport of intermediate position and the optical fiber center of circle and
The center of circle in inner air hole is located in same vertical straight line, and the center of circle of seven airports of first layer airport is in a level
On straight line；The airport in first layer airport middle position be provided in for light energy from the optical fiber center of circle to metal and to
Two leakage paths are provided when surveying analyte solution leakage；
There are six airport, third layer airport, the 4th layer of airport and layer 5 air for the setting of second layer airport
Hole is respectively set there are four airport, second layer airport, third layer airport, the 4th layer of airport and layer 5 airport
Respective airport the center of circle respectively on a horizontal linear, second layer airport, third layer airport, the 4th layer of air
Hole and the center of circle of the outermost airport of layer 5 airport be sequentially connected after be a regular hexagon half；
Second layer airport, third layer airport, the 4th layer of airport and layer 5 airport airport setting
For adjusting the relative index of refraction difference of control covering and fibre core, so that limiting light can be according to total internal reflection principle in fibre core
To be conducted；
The setting in the inner air hole is for preventing light from revealing down from fibre core and promoting light to metal and analysis to be measured
Object space is to transfer；
One layer of golden film is provided on the burnishing surface of the optical fiber, the golden film is that surface plasmon resonance effect mentions
For induction；
In use, optical fiber is immersed in test analyte liquid, the perfect domination set is located at test analyte liquid
Outside, for calculating boundary added when carrying out performance simulation to optical fiber.
Preferably, the base material of the optical fiber is silica.
Preferably, the circle center distance of optical fiber described in the distance of center circle in the center air hole of the first layer airport is 1.5 μm,
The circle center distance of optical fiber described in the distance of center circle in the inner air hole is 2 μm.
Preferably, the radius r of the first layer airportaIt is 0.5 μm, the radius r in institute's rheme inner air holecFor 1.5 μ
M, the airport r of remaining conventional spreadbRadius is 0.8 μm.
Preferably, the material of the golden film is gold, and the thickness t of the golden film is 40nm.
Preferably, distance d of the lower edge of the golden film away from the optical fiber center of circle is 3 μm.
Preferably, the circle of the center of circle of the airport in first layer airport middle position two airports adjacent thereto
Spacing ∧ between the heart2It is 2 μm, the spacing ∧ between the center of circle of remaining adjacent any two airport1It is 1.5 μm.
Preferably, the line shape in the center of circle of outermost airport of the second layer airport into layer 5 airport
At the half of a regular hexagon, the center of circle of the airport of secondary outer layer of the second layer airport into layer 5 airport
Line is similarly formed the half of a regular hexagon, and three adjacent air pore size distributions are in equilateral triangle lattice structure, and phase
Spacing ∧ between two adjacent airports3It is 2 μm.
It is preferably located at left several third airports in six airports of the second layer and second sky of left number in this layer
The center of circle of second airport of left number in stomata and third layer forms an equilateral triangle lattice structure, is located at the second layer six
The 5th airport of left number in the 4th airport of left number and this layer in a airport and left several thirds in third layer
The center of circle of a airport forms an equilateral triangle lattice structure, and the spacing ∧ between two adjacent airports3It is 2 μ
m。
Preferably, the Refractive Index Analysis range of the test analyte liquid is 1.377~1.385.
Compared with prior art, the present invention has the advantage that
1, the present invention is based on surface plasmon resonance effect, the sensor proposed can be used double loss peaks and carry out
The refractometry of more accurate test analyte, and the sensing measurement of other physical quantitys relevant to analyte.Especially
It is that two loss peaks of this sensor are located at two different wave bands of long and short wave, wherein can be with for first loss peak
The spectrometer detection of ccd detector is directly selected, and can then select lead selenide detector to carry out second loss peak
Observation, and the design of the double loss peaks of this sensor just for practical application provide well the compatibility of observation spectrometer selection with
Alternative, this is that have function not available for sensor at present.
2, the design of double loss peaks of the invention also provides the selection of a variety of usage modes for the application of sensor, makes
Used time not only can choose bimodal detection, but can choose it is therein some unimodal detected；It is also an option that using it
In one it is unimodal carry out main detection, and select other one is unimodal to carry out auxiliary and confirmatory detection.This be also at present
There is characteristic not available for sensor.
3, sensor of the invention is designed based on the structure of D-type optical fiber, gold-plated compared in optical fiber air on burnishing surface
Gold-plated in hole, the uniformity for operating the covering of more simple and golden film is more controllable.
4, test analyte is directly contacted microstructured optical fibers outer surface when in use by the present invention directly to pass
The detection of perceptual energy, operation convenience is good, and detection means is more accurate efficiently.And it is with good structural stability, with
The variation of refractive index, the position of trough is invariable in loss spectra.
5, sensor of the invention has good sensing capabilities, the wavelength sensitivity and product being calculated using secondary peak
Prime factor is up to 29000nm/RIU and 1115 respectively.
Detailed description of the invention
Fig. 1 is the fiber cross-sections schematic diagram of the embodiment of the present invention one；
Fig. 2 is double loss peak schematic diagrames of the embodiment of the present invention one；
Fig. 3 is the SPP mode distributions figure of the embodiment of the present invention one；
Fig. 4 is dispersion relation schematic diagram of the embodiment of the present invention one under refractive index 1.377；
Fig. 5 is dispersion relation schematic diagram of the embodiment of the present invention one under refractive index 1.383；
Fig. 6 is dispersion relation schematic diagram of the embodiment of the present invention one under refractive index 1.385；
Fig. 7 is the bimodal resonant wavelength of the embodiment of the present invention one and the function relation figure of analyte refractive index；
Fig. 8 is the quality factor of the embodiment of the present invention one with the variation relation figure of analyte refractive index；
Fig. 9 is the concrete operations operation instruction schematic diagram of the embodiment of the present invention two.
Specific embodiment
To show in detail below with reference to attached drawing and illustrates exemplary embodiment of the present invention and sensor characteristics etc.
Information.The same reference numbers in the drawings refer to elements functionally identical or similar.Although embodiment is shown in the attached drawings
Various aspects, but unless otherwise indicated, it is not necessary to attached drawing drawn to scale.
Specifically, the present invention provides a kind of D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections, such as Fig. 1
It is shown comprising base material, covering airport 4, golden film 1 and test analyte liquid 3.
Covering airport includes inner air hole and five layers of airport that internal 9 periphery of airport is arranged in, inner air
The aperture in hole 9 is greater than the aperture of five layers of airport, and five layers of airport include first layer airport 11, second layer airport 12, the
Three layers of airport 13, the 4th layer of airport 14 and layer 5 airport 15, second layer airport, third layer airport, the 4th
The aperture of layer airport and layer 5 airport is equal and is greater than the aperture of first layer airport 11.
First layer airport 11 includes including seven airports, the center of circle, the optical fiber center of circle of the airport 10 of intermediate position
And the center of circle in inner air hole 9 is located in same vertical straight line, the center of circle of seven airports of first layer airport 11 exists
On one horizontal linear；The airport 10 in 11 middle position of first layer airport be provided in for light energy from the optical fiber center of circle to
Metal and test analyte solution provide two leakage paths when revealing.Two leakage paths are respectively leakage channel 6 and leakage
Channel 7.
There are six airport, third layer airports 13, the 4th layer of airport 14 and the 5th for the setting of second layer airport 12
Layer airport 15 is respectively set there are four airport, second layer airport, third layer airport, the 4th layer of airport and the 5th
The center of circle of the respective airport of layer airport is respectively on a horizontal linear, second layer airport, third layer airport, the
The center of circle of four layers of airport and the outermost airport of layer 5 airport constitutes the one of a regular hexagon after being sequentially connected
Half；The center of circle of the airport of second layer airport, third layer airport, the 4th layer of airport and layer 5 airport time outer layer
Also the half of a regular hexagon is constituted after being sequentially connected.
Second layer airport 12, third layer airport 13, the 4th layer of airport 14 and layer 5 airport 15 air
The setting in hole is used to adjust the relative index of refraction difference of control covering and fibre core, so that limiting light can be according to complete interior in fibre core
Principle of reflection carries out biography light.
The setting in inner air hole 9 is for preventing light from revealing down from fibre core and promoting light to metal and test analyte side
To transfer.
It deposited one layer of golden film 1 on the burnishing surface of optical fiber, the induction material occurred as surface plasmon resonance effect
Material；Outermost layer is fluid analysis object, and optical fiber is completely submerged in test analyte liquid 3 by sensor when in use；Most
Outer layer is perfect domination set, added calculating boundary when for using FInite Element progress performance simulation.
Preferably, the base material of optical fiber is silica.
Preferably, the circle center distance of optical fiber described in the distance of center circle of the airport 10 of the centre of first layer airport is 1.5 μm,
The circle center distance of optical fiber described in below the optical fiber center of circle, the maximum inner air hole 10 of pore radius distance of center circle is 2 μm.
Preferably, the radius r of first layer airportaIt is 0.5 μm, it is below the optical fiber center of circle, pore radius is maximum
The radius r in inner air hole 9cIt is 1.5 μm, remaining air pore radius rbIt is 0.8 μm.
Preferably, the material of golden film 1 is gold, and its thickness t is 40nm.
Preferably, D type photonic crystal fiber polishes depth, i.e., the lower edge of the described golden film 1 is away from the distance d in the optical fiber center of circle
It is 3 μm.
Preferably, according to the position arrangement of airport in first layer from left to right, the ascending mode of name serial number, institute
State first and second, second in first layer airport and third, the 5th and the 6th, the 6th and the 7th
Spacing ∧ between the center of circle of airport1It is 1.5 μm；Third in first layer airport with the 4th, the 4th and the
Spacing ∧ between the center of circle of five airports2It is 2 μm.
Preferably, four airports of the edge of the second layer, the center of circle of the airport of third layer to layer 5 are all located at phase
It answers on regular hexagon whole range structure, the lattice structure row triangular in shape of three air pore size distributions of arbitrary neighborhood on these layers
Column, and the spacing ∧ of two adjacent airports3It is 2 μm.
Preferably, the Refractive Index Analysis range of testing liquid is 1.377~1.385.
Embodiment one
Fig. 1 is the end face knot of the D type the interferometric optical fiber sensor of photon crystal optical fibre device of available double loss blob detections of the present invention
Composition.In Fig. 1, deposited one layer of golden film 1 on the burnishing surface of optical fiber, golden film with a thickness of 40nm, be used as surface plasma
The induced material that resonance body effect occurs；What it is next to golden film is fluid analysis object 3, and sensor when in use soaks optical fiber completely
Not in test analyte liquid 3；Outermost layer is perfect domination set 5, is to carry out performance simulation when institute using FInite Element
The calculating boundary added and auxiliary setting.
The base material 2 of optical fiber is quartz；The not exactly the same airport of many sizes, packet are provided in quartz material
The presence of airport reduces the effective refractive index of fibre cladding in layer, to realize cladding regions to fiber core region
Refractive index reduces, and light is limited in transmission in fibre core and plays decisive role by this to realize total internal reflection.
The airport 4 of clad region wherein is constituted in five layers of topology layout up and down, and wherein different size of comprising three kinds
Airport, radius use r respectivelya、rbAnd rcIt indicates, wherein raFor the radius of the first layer airport, rcFor positioned at optical fiber circle
8 lower section of the heart, the maximum airport 9 of pore radius radius, rbFor second and third, identical size air hole in four and five layers
Radius.
Wherein, the center of circle of the airport 10 of the centre of first layer, the center of circle 8 of optical fiber and below the optical fiber center of circle, stomata
The center of circle three in the maximum inner air hole 9 of radius is sequentially located at from top to bottom in same vertical straight line.The center of first layer
The center of circle 8 of the distance of center circle optical fiber of airport 10 is apart from being 1.5 μm, below the optical fiber center of circle, the maximum inside of pore radius
The center of circle 8 of the distance of center circle optical fiber of airport 9 is apart from being 2 μm；D type photonic crystal fiber polishes depth, i.e., the lower edge of the described golden film 1
Distance d away from the optical fiber center of circle 8 is 3 μm.
In addition, according to airport in first layer position arrangement from left to right, the ascending mode of name serial number, first
First in layer airport with second, second with third, the 5th with the 6th and the 6th and the 7th air
Spacing ∧ between the center of circle in hole1It is 1.5 μm；Third in first layer airport with the 4th and the 4th and the 5th
Spacing ∧ between the center of circle of a airport2It is 2 μm.
Four airports of the edge of the second layer, the center of circle of the airport of third layer to layer 5 are all located at corresponding positive six side
On shape whole range structure, three air pore size distributions of arbitrary neighborhood lattice structure triangular in shape on these layers is arranged, and phase
The spacing ∧ of two adjacent airports3It is 2 μm.
In sensor use process, selective refraction rate range is the test analyte of 1.377-1.385, is surveyed according to real-time
Wavelength location corresponding to the paddy occurred in the spectrum obtained by loss is measured, fiber core mode in lower surface analysis will be just corresponded to
Loss peak position.In conjunction with following analysis, the position of two resonant wavelengths according to locating for double loss peaks can be more quasi-
The refractive index value of the testing liquid really is obtained, to realize the sensing measurement to liquid refractivity to be measured.
Fig. 2 is the fiber transmission attenuation figure of the embodiment of the present invention one.We order the double loss peaks occurred in loss figure
Entitled main peak and secondary peak represent different location with letter a-e and f-j respectively.As shown, with the increase of refractive index, it is main
Red shift and blue-shifted phenomenon has occurred in resonant wavelength corresponding to peak and secondary peak respectively, and the distance between double loss peaks is caused to become to get over
Come narrower.Meanwhile bimodal loss peak also becomes to become closer to.In addition, when refraction index changing, wave corresponding to trough
It is long maintain it is invariable 1050nm at, this illustrate sensor proposed by the invention can use double loss peaks sense it is same
When but also have highly stable performance.
Fig. 3 is the SPP mode distributions figure of the optical fiber of the embodiment of the present invention one.Wherein, a-f indicate SPP mould field respectively with
Loss peak resonant wavelength position in Fig. 2 is corresponding.We have found that when refractive index value is between 1.377-1.383, two
The corresponding SPP mode distributions in loss peak place are different, but when refractive index increases to 1.385, at two peaks SPP
Mode distributions it is the same.
Fig. 4-Fig. 6 be respectively the embodiment of the present invention one refractive index be 1.377,1.383 and 1.385 when fibre-optical dispersion close
It is schematic diagram.When the effective refractive index curve intersection of basic mode and SPP mode, show to meet table under resonant wavelength here
Phase-matching condition between surface plasma wave and evanescent wave.With being gradually increased for refractive index, due to depositing for mode competition
, the reduced trend of the type presentation of SPP mode, and the effective refractive index of SPP mode will also become to become closer in basic mode
Effective refractive index.When refractive index is 1.385, only it is left a kind of SPP mode and energy coupling has occurred in basic mode, so
There is the same phase-matching condition the phenomenon that different resonance wave strong points have occurred twice.
What Fig. 7 and Fig. 8 was respectively represented is the bimodal resonant wavelength of the embodiment of the present invention one with the letter of analyte refractive index
Relational graph and quality factor are counted with the variation relation figure of analyte refractive index.Mean wavelength sensitivity is usually on fibre optical sensor
The parameter used, the effect of sensor when it indicates to receive different wave length incident light, can be indicated with formula:
Sλ=d λpeak/dna
N is expressed as the refractive index of analyte in formula and λ is expressed as resonant wavelength, and unit is nm.SλLogical conventional unit
nm·RIU-1To indicate.Wherein d λ is the displacement of resonant wavelength, dnaThe variation of real analysis object refractive index.Quality can also be used
Factor carries out the Performance Evaluation of sensor, can be indicated with following formula:
FOM=Sλ/FWHM
S in formulaλThe mean wavelength sensitivity of representative, the full width at half maximum for referring to loss spectra that FWHM is represented.
As shown in fig. 7, utilizing main peak and the secondary peak calculating in double loss peaks that can obtain resonant wavelength and analyte respectively
The functional relation of refractive index, i.e. y=19000x-25357 and y=-29000x+41283, corresponding linear coefficient point
It Wei 0.89456 and 0.98899.According to calculation formula noted earlier, we can use main peak in double loss peaks and
Secondary peak calculating respectively obtains 19000nmRIU-1And 29000nmRIU-1Two kinds of mean wavelength sensitivity.Fig. 8 shows benefit
Available peak is calculated up to 1115 quality factor with secondary peak.In Fig. 8 when refractive index is 1.383, double loss peaks
The quality factor of middle main peak and secondary peak are equal, this is primarily due to being averaged under the test analyte refractive index main peak and secondary peak
The ratio between wavelength sensitivity is by chance equal with the ratio between the full width at half maximum of the two loss peaks, is reflected as two under the refractive index in figure
Curve is intersected.To sum up, the present invention has good sensing capabilities.
Embodiment two
The sensor structure parameter of the present embodiment is identical with embodiment one, and characteristic description and performance characterization are also and real
It is identical to apply example one.The present embodiment is by specific example and further illustrates a variety of usages of institute's invention sensor.
Fig. 9 shows concrete operations operation instruction schematic diagram of the invention.It is first that D type photon of the present invention is brilliant
The both ends difference welding single mode optical fiber of body optic fibre refractive index sensor constitutes sensor 102；Then, in one end of sensor 102
Wideband light source 100 is connected by coupling device 101, it, will by the arrival end welding of the other end of sensor 102 and beam splitter 103
The spectrometer 104 with ccd detector is respectively connected to by the two-beam that beam splitter comes out and surveys the near infrared light of near infrared spectrum
The good sensor 102 of welding is immersed in equipped with testing liquid by spectrometer 105 (such as lead selenide detector spectrometer), when experiment
In container.The light issued in this way through wideband light source can pass through sensor, enter back into beam splitter 103, light beam will be divided at this time
Two beams, and sensing conclusion is obtained finally by TuPu method by 104 and 105 spectrometer detection respectively.
Below by taking testing liquid refractive index is 1.384 as an example, a variety of usages of the invention are elaborated, it specifically, can be with
Selection carries out bimodal standard detection and unimodal selective enumeration method:
1, selection carries out the example of bimodal standard detection
When testing liquid refractive index is 1.384, detects and obtained spectrally on ccd detector spectrometer, in 939nm
Place can observe an apparent loss (i.e. the trough of spectrum), while can be in the transmission spectrum that near infrared spectrometer is shown
An apparent trough is observed at 1147nm.It can correspond to obtain this on following sensor calibration line shown in Fig. 7
The corresponding refractive index of two wavelength is 1.384.Therefore, from the available conclusion of Fig. 7: the testing liquid refractive index of this measurement
It is 1.384.Corresponding spectrum trough corresponds to loss peak described in above-mentioned analysis in actual spectrum described herein, and herein
The 939nm and 1147nm respectively corresponds the central wavelength of above-mentioned main peak and secondary peak.
In addition, can also correspond to obtain from Fig. 8, this measures the difference of quality factor corresponding to resulting main peak and secondary peak
For 504.18 and 773.82.
This example describes the application method of bimodal standard detection.
2, selection carries out the example of the alternative application of unimodal selective enumeration method and spectrometer
In the examples described above, two kinds of spectrometers of our simultaneous selections carry out the bimodal detection of standard.In practice, may be used also
It is detected with selecting any a spectrometer therein according to physical condition and demand；It is also an option that wherein a light
Spectrometer is decided detection, and in addition a spectrometer does auxiliary verifying detection.Therefore, sensor of the invention use is very flexible.
In conclusion being based on surface plasmon resonance effect, the sensor proposed can be used double loss peaks and carry out
The refractometry of more accurate test analyte.During using sensor, we are it can be found that work as analysis layer
When refractive index value with liquid is between 1.377 to 1.385, due to the presence of double loss peaks, so the short-wave band in spectrum
Two corresponding troughs can successively occur with long-wave band.We can choose carries out unimodal detection in short wave ranges；It can also
Unimodal detection is carried out in long wave limit with selection；It is also an option that using one of those it is unimodal carry out main detection, and select
In addition one is unimodal to carry out auxiliary and confirmatory detection, can greatly improve the accuracy of testing result in this way.
Finally, it should be noted that above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should understand that:
It can still modify to technical solution documented by previous embodiment, or to part of or all technical features into
Row equivalent replacement；And these modifications or substitutions, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side
The range of case.
Claims (10)
1. a kind of D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections, it is characterised in that: it includes substrate material
Material, covering airport, golden film, test analyte liquid and perfect domination set；
The covering airport includes inner air hole and five layers of airport that the inner air hole periphery is arranged in, it is described in
Portion's airport is located at the lower section in the optical fiber center of circle, and the aperture in the inner air hole is greater than the aperture of five layers of airport, and described five layers
Airport includes first layer airport, second layer airport, third layer airport, the 4th layer of airport and layer 5 air
Hole, wherein the aperture of second layer airport, third layer airport, the 4th layer of airport and layer 5 airport is equal and big
In the aperture of first layer airport,
The first layer airport includes seven airports, the center of circle and the optical fiber center of circle and inside of the airport of intermediate position
The center of circle of airport is located in same vertical straight line, and the center of circle of seven airports of first layer airport is in a horizontal linear
On；The airport in first layer airport middle position is provided in as light energy from the optical fiber center of circle to metal and to be measured point
Two leakage paths are provided when analysing the leakage of object solution；
There are six airport, third layer airport, the 4th layer of airport and layer 5 airports point for the setting of second layer airport
Not She Zhi there are four airport, second layer airport, third layer airport, the 4th layer of airport and layer 5 airport it is each
From the center of circle of airport respectively on a horizontal linear, second layer airport, third layer airport, the 4th layer of airport with
And the center of circle of the outermost airport of layer 5 airport be sequentially connected after be a regular hexagon half；
The setting of airport of second layer airport, third layer airport, the 4th layer of airport and layer 5 airport is used to
The relative index of refraction difference for adjusting control covering and fibre core, is passed in fibre core according to total internal reflection principle to limit light
It leads；
The setting in the inner air hole is for preventing light from revealing down from fibre core and promoting light to metal and test analyte side
To transfer；
One layer of golden film is provided on the burnishing surface of the optical fiber, the golden film provides for surface plasmon resonance effect to lure
It leads；
In use, optical fiber is immersed in test analyte liquid, the perfect domination set is located at the outside of test analyte liquid,
It is the added calculating boundary when carrying out performance simulation to optical fiber.
2. the D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections according to claim 1, feature exist
In: the base material of the optical fiber is silica.
3. the D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections according to claim 1, feature exist
In: the circle center distance of optical fiber described in the distance of center circle in the center air hole of the first layer airport is 1.5 μm, the inner air
The circle center distance of optical fiber described in the distance of center circle in hole is 2 μm.
4. the D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections according to claim 1, feature exist
In: the radius r of the first layer airportaIt is 0.5 μm, the radius r in the inner air holecIt is 1.5 μm, remaining airport
Radius rbIt is 0.8 μm.
5. the D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections according to claim 1, feature exist
In: the material of the golden film is gold, and the thickness t of the golden film is 40nm.
6. the D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections according to claim 5, feature exist
In: distance d of the lower edge of the golden film away from the optical fiber center of circle is 3 μm.
7. the D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections according to claim 1, feature exist
In: the spacing between the center of circle of the center of circle of the airport in first layer airport middle position two airports adjacent thereto
∧2It is 2 μm, the spacing ∧ between the center of circle of remaining adjacent any two airport1It is 1.5 μm.
8. the D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections according to claim 1, feature exist
In: the line in the center of circle of outermost airport of the second layer airport into layer 5 airport forms positive six side
The line of the half of shape, the center of circle of the airport of secondary outer layer of the second layer airport into layer 5 airport is similarly formed
The half of one regular hexagon, three adjacent air pore size distributions are in equilateral triangle lattice structure, and two adjacent air
Spacing ∧ between hole3It is 2 μm.
9. the D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections according to claim 1, feature exist
In: second airport of left number and third in left several third airports and this layer in six airports of the second layer
The center of circle of second airport of left number in layer forms an equilateral triangle lattice structure, in six airports of the second layer
The circle of the 5th airport of left number in the 4th airport of left number and this layer and left several third airports in third layer
The heart forms an equilateral triangle lattice structure.
10. the D type the interferometric optical fiber sensor of photon crystal optical fibre device of double loss blob detections according to claim 1, feature exist
In: the Refractive Index Analysis range of the test analyte liquid is 1.377~1.385.
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| CN113625389A (en) * | 2021-07-21 | 2021-11-09 | 中国地质大学（武汉） | Single-mode single-polarization photonic crystal fiber with air holes arranged by linear defects and introduced by gold wires |
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