CN110308115A - A kind of interference-type optical fiber spr sensor - Google Patents
A kind of interference-type optical fiber spr sensor Download PDFInfo
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- CN110308115A CN110308115A CN201910514612.5A CN201910514612A CN110308115A CN 110308115 A CN110308115 A CN 110308115A CN 201910514612 A CN201910514612 A CN 201910514612A CN 110308115 A CN110308115 A CN 110308115A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N2021/258—Surface plasmon spectroscopy, e.g. micro- or nanoparticles in suspension
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
- G01N2021/458—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods using interferential sensor, e.g. sensor fibre, possibly on optical waveguide
Abstract
The present invention is suitable for fiber optic sensor technology field, provides a kind of interference-type optical fiber spr sensor, including the first single mode optical fiber, the second single mode optical fiber and coreless fiber；Coreless fiber is fixed between the first single mode optical fiber and the second single mode optical fiber；Coreless fiber includes the metal-coated surface of coreless fiber main body and covering part coreless fiber main body, and coreless fiber main body and metal-coated surface constitute surface plasma resonance structural body；When interference-type optical fiber spr sensor measures, external incident light wave is inputted by the first single mode optical fiber or the second single mode optical fiber；When incident light wave propagates to the contact surface of the first single mode optical fiber and coreless fiber or when propagating to the contact surface of the second single mode optical fiber and coreless fiber, multiple-mode interfence occurs in coreless fiber, plasma resonance occurs for the surface of coreless fiber.It is based on single-sensor through the invention, realizes the measurement based on SPR sensorgram and the measurement based on interference sensing, also achieves the synchro measure of multi-parameter.
Description
Technical field
The present invention relates to fiber optic sensor technology field more particularly to a kind of interference-type optical fiber spr sensors.
Background technique
Interferometric optical fiber sensor has been widely used in the energy, traffic, the industrial circles such as aviation.It is tied based on different interference
Interference sensor structure can be divided into Michelson, Mach Zeng De, plug lattice nanogram etc. by the division of structure.In addition, being based on multimode
Interferometric optical fiber sensor has also formed between the mode of optical fiber, in its structure, generally includes one and is fused to two single modes
Multimode fibre between optical fiber, when wide range optical signal is incident to multimode fibre from single-mode fiber end, due to Mode Coupling effect
Excitation generates higher order mode optical waveguide, and then causes core mode and the generation interference of disappearance mould, by analyzing the output of this sensor
The sensing to different parameters, such as temperature may be implemented in the drift of interference spectrum, strains, load, refractive index etc..
But the refractive index sensing sensitivity of conventional interference type fibre optical sensor is lower, is usually no more than 300nm/RIU,
To limit it in the application in highly sensitive refractive index monitoring field.So, field is monitored in highly sensitive refractive index, it is such as raw
Change detection, SPR (Surface Plasmon Resonance, surface plasma body resonant vibration) sensor, refractive index inspection will be selected
Surveying sensitivity is usually thousands of nm/RIU, it is seen that the sensitivity of spr sensor outclass traditional interferometric optical fiber sensor.
Spr sensor is a kind of fibre optical sensor, is mainly floated by the wavelength peak that surface plasmon resonance absorption is composed
It moves and realizes to the monitoring of different liquids refractive index, however, being only able to achieve single liquid in synchronization, same optical fiber SPR sensor
The detection of body refractive index, is unable to complete the synchro measure of multiple parameters, still significantly limits the application in field of sensing technologies.
Summary of the invention
It is a primary object of the present invention to propose a kind of interference-type optical fiber spr sensor, to solve to interfere in the prior art
Type fibre optical sensor susceptibility is low, can not apply and monitor field in highly sensitive refractive index, and is applied to highly sensitive refractive index
The optical fiber SPR sensor in monitoring field is only able to achieve single parameter detection, so that detection efficiency is low, and limits its application field
Problem.
To achieve the above object, first aspect of the embodiment of the present invention provides a kind of interference-type optical fiber spr sensor, including
One single mode optical fiber, the second single mode optical fiber and coreless fiber；
The coreless fiber is fixed between first single mode optical fiber and second single mode optical fiber；
The coreless fiber includes the metal-coated surface of coreless fiber main body described in coreless fiber main body and covering part,
The coreless fiber main body and the metal-coated surface constitute surface plasma resonance structural body；
When the interference-type optical fiber spr sensor measures, external incident light wave is by first single mode optical fiber or described the
The input of two single mode optical fibers；
When the incident light wave propagates to the contact surface of first single mode optical fiber and the coreless fiber or propagate to institute
When stating contact surface of second single mode optical fiber with the coreless fiber, multiple-mode interfence, the centreless light occur in the coreless fiber
Plasma resonance occurs for the surface that fiber covering is stamped metal film.
Optionally, interference-type optical fiber spr sensor further includes spectrometer；
When external incident light wave is inputted by first single mode optical fiber, second single mode optical fiber not with the coreless fiber
One end of contact is connect with spectrometer；
When external incident light wave is inputted by second single mode optical fiber, first single mode optical fiber not with the coreless fiber
One end of contact is connect with spectrometer；
The spectrometer analyzes the suction of the surface plasma resonance structural body for the spectrum according to visible light region
It receives in spectrum, the drift value of wavelength peak；
The spectrometer is also used to the spectrum according near infrared region, analyzes in the coreless fiber and multiple-mode interfence occurs
When, the drift value of the wavelength peak of the interference spectrum exported.
Optionally, first single mode optical fiber and second single mode optical fiber include fibre cladding and are placed in the optical fiber
Fiber core among covering；
The fiber core center pair at the coreless fiber center and first single mode optical fiber and second single mode optical fiber
Together.
Optionally, the metal-coated surface includes the golden metal film of preset thickness.
Optionally, the golden metal film is plated in coreless fiber main body by magnetron sputtering coater.
Optionally, the coreless fiber main body includes earth silicon material.
The embodiment of the present invention proposes a kind of interference-type optical fiber spr sensor, including the first single mode optical fiber, the second single mode optical fiber
And coreless fiber, coreless fiber is fixed among the first single mode optical fiber and the second single mode optical fiber, by wide spectrum light source from wherein one
Incident light wave when one end input of a single mode optical fiber, when incident light waveguide is traveled to up to single mode optical fiber and coreless fiber contact surface
When, it is excited by optical waveguide mode coupling effect and generates different type higher order mode optical waveguide, and then make to generate in coreless fiber
Multiple-mode interfence realizes the function of conventional interference type fibre optical sensor；And the metal-coated surface of coreless fiber and coreless fiber master
Body constitutes surface plasma resonance structural body, therefore, when incident light waveguide is traveled to up to single mode optical fiber with coreless fiber contact surface,
The wavelength peak of surface plasmon resonance absorption spectrum generates drift, to realize the design of spr sensor.Therefore, the present invention is real
It applies example and is based on single-sensor, realize the measurement based on SPR sensorgram and the measurement based on interference sensing, also achieve multi-parameter
Synchro measure, compared with interferometric optical fiber sensor structure, have higher interference susceptibility, and with traditional single optical fiber
Spr sensor is compared, and interferometry can be achieved at the same time.Further, since SPR sensorgram and interference sensing use different transmissions
Spectral band and different sensing principles, measurement process is mutually unaffected, greatly optimizes sensor performance, makes it in life
Object, chemistry, physical detection sensory field have potential application potentiality.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the interference-type optical fiber spr sensor that the embodiment of the present invention one provides；
Fig. 2 is the composed structure schematic diagram of experimental provision provided by Embodiment 2 of the present invention；
Fig. 3 is the comparison of light source light spectrum provided by Embodiment 2 of the present invention and interference-type optical fiber spr sensor output spectrum
Figure；
Fig. 4 is the interference-type that the solution provided by Embodiment 2 of the present invention using different size refractive index is tested
Optical fiber SPR sensor output light spectrogram；
Fig. 5 is the interference-type optical fiber spr sensor output spectrum after mathematics smoothing processing provided by Embodiment 2 of the present invention
Figure.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
Herein, using the suffix for indicating such as " module ", " component " or " unit " of element only for advantageous
In explanation of the invention, there is no specific meanings for itself.Therefore, " module " can be used mixedly with " component ".
In subsequent description, inventive embodiments serial number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
Embodiment one
As shown in Figure 1, the embodiment of the present invention provides a kind of interference-type optical fiber spr sensor 100 (not marking in figure), including
First single mode optical fiber 10, the second single mode optical fiber 20 and coreless fiber 30 (not marked in figure).
In embodiments of the present invention, each position connection relationship of interference-type optical fiber spr sensor 100 is as follows:
Coreless fiber 30 is fixed between the first single mode optical fiber 10 and the second single mode optical fiber 20, then coreless fiber 30 both ends
Section and a section of the first single mode optical fiber 10 and the second single mode optical fiber 20 fit closely.
Wherein, coreless fiber 30 includes the surface metal plating of coreless fiber main body 31 and covering part coreless fiber main body 31
Film 32, coreless fiber main body 31 and metal-coated surface 32 constitute surface plasma resonance structural body.
In a particular application, the first single mode optical fiber and the second single mode optical fiber include fibre cladding and are placed in fibre cladding
Between fiber core.Wherein, coreless fiber center is aligned with the fiber core center of the first single mode optical fiber and the second single mode optical fiber,
So that straightline propagation of the external incident light wave in interference-type optical fiber spr sensor avoids other refractions when measurement.
In embodiments of the present invention, one end that the first single mode optical fiber 10 is not contacted with coreless fiber 30 can be interference-type light
The input terminal of fine spr sensor 100, one end that the second single mode optical fiber 20 is contacted with coreless fiber 30 may be interference-type optical fiber
The input terminal of spr sensor.So, when interference-type optical fiber spr sensor 100 measures, external incident light wave is by the first single-mode optics
Fibre 10 or the second single mode optical fiber 20 input；When incident light wave propagates to the first single mode optical fiber 10 and the contact surface of coreless fiber 30 or
When propagating to the second single mode optical fiber 20 and the contact surface of coreless fiber 30, multiple-mode interfence, coreless fiber occurs in coreless fiber 30
Plasma resonance occurs for 30 surface.
Wherein, the principle of the multiple-mode interfence occurred in coreless fiber 30 are as follows: when wide range optical signal is incident from single-mode fiber end
When to coreless fiber, higher order mode optical waveguide is generated since Mode Coupling effect excites, and then cause the core mode of coreless fiber
Interference is generated with disappearance mould.
In a particular application, the coreless fiber main body of metal-coated surface only covering part, without covering coreless fiber
Whole outer surfaces of main body, it is possible to reduce when wide range optical signal is incident to coreless fiber from single-mode fiber end, metal film believes light
Number absorption and the consumption that generates, to avoid weakening above-mentioned multiple-mode interfence effect.
In embodiments of the present invention, area coverage of the metal-coated surface in coreless fiber main body is not defined,
The effect of metal-coated surface covering part coreless fiber main body is schematically illustrated in Fig. 1.
In embodiments of the present invention, external incident light wave is that wide range optical signal transmitter or wide range optical signal source emit
Light beam.
In practical applications, multimode fibre is fibre core/cladding structure, wherein fibre core and clad doped a small amount of different micro members
Element respectively constitutes different materials.In the embodiment of the present invention use coreless fiber instead of multimode fibre, can be considered by fibre core with
Covering is combined into one.Compared with traditional interferometric optical fiber sensor, interference-type optical fiber SPR sensorgram provided in an embodiment of the present invention
Device is using coreless fiber as interference vector, and disappearance mould ratio is bigger in the high-order mode that Mode Coupling process generates, and power is more
Height, to improve interference susceptibility.
Wherein, the principle of plasma resonance occurs for the surface of coreless fiber 30 are as follows: coreless fiber main body and surface metal plating
Film constitutes surface plasma resonance structural body, when wide range optical signal is incident to coreless fiber from single-mode fiber end, emergent light meeting
Metal coating surface refractive index is caused to change.
In embodiments of the present invention, metal-coated surface 32 includes the golden metal film of preset thickness；
Golden metal film is plated in coreless fiber main body 31 by magnetron sputtering coater.
And coreless fiber main body 31 includes earth silicon material.
In a particular application, coreless fiber main body is constituted by the silica simple substance of high-purity, capacity is big, anti-interference ability
By force, be conducive to improve interference susceptibility.
In one embodiment, interference-type optical fiber spr sensor 100 further includes spectrometer, in interference-type optical fiber SPR sensorgram
When device measures, measurement result, such as the intensity of spectral line data are exported.
Wherein, when external incident light wave is inputted by first single mode optical fiber, second single mode optical fiber not with the nothing
One end of core fibre contact is connect with spectrometer；When external incident light wave is inputted by second single mode optical fiber, described first is single
One end that mode fiber is not contacted with the coreless fiber is connect with spectrometer；
The spectrometer analyzes the suction of the surface plasma resonance structural body for the spectrum according to visible light region
It receives in spectrum, the drift value of wavelength peak；The spectrometer is also used to the spectrum according near infrared region, analyzes the centreless light
When multiple-mode interfence occurring in fibre, the drift value of the wavelength peak of the interference spectrum exported.
In embodiments of the present invention, the above-mentioned measurement that physical quantity has been corresponded to the analysis result of spectrum, such as temperature, strain,
Load, refractive index etc..
The embodiment of the present invention provides a kind of interference-type optical fiber spr sensor, including the first single mode optical fiber, the second single mode optical fiber
And coreless fiber, coreless fiber is fixed among the first single mode optical fiber and the second single mode optical fiber, by wide spectrum light source from wherein one
One end of a single mode optical fiber inputs incident light wave, when incident light waveguide is traveled to up to single mode optical fiber with coreless fiber contact surface,
It is excited by optical waveguide mode coupling effect and generates different type higher order mode optical waveguide, and then make to generate multimode in coreless fiber
The function of conventional interference type fibre optical sensor is realized in interference；And the metal-coated surface of coreless fiber and coreless fiber main body structure
At surface plasma resonance structural body, therefore, when incident light waveguide is traveled to up to single mode optical fiber with coreless fiber contact surface, surface
The wavelength peak of plasma resonance absorption spectrum generates drift, to realize the design of spr sensor.Therefore, the embodiment of the present invention
Based on single-sensor, the measurement based on SPR sensorgram and the measurement based on interference sensing are realized, the same of multi-parameter is also achieved
Pacing amount, compared with interferometric optical fiber sensor structure, have higher interference susceptibility, and with traditional single optical fiber SPR
Sensor is compared, and interferometry can be achieved at the same time.Further, since SPR sensorgram and interference sensing use different transmitted lights
Wave band and different sensing principles are composed, measurement process is mutually unaffected, greatly optimizes sensor performance, and make it in biology,
Chemistry, physical detection sensory field have potential application potentiality.
Embodiment two
As shown in Fig. 2, the embodiment of the invention also provides the (figures of experimental provision 200 based on interference-type optical fiber spr sensor
In do not mark), to verify the performance for the interference-type optical fiber spr sensor 100 that embodiment one is proposed.
As shown in Fig. 2, in experimental provision 200, light source by wide range optical signal source 40 as external incident light wave is placed on
Spectrometer 50 is placed on the other end of interference-type optical fiber spr sensor 100 by one end of interference-type optical fiber spr sensor 100,
Spectrometer 50 will also treated that data export to showing in terminal 60；During experiment, interference-type optical fiber SPR sensorgram
Device 100 will be placed on tool there are two in the small-size glass pipe 70 for entering and leaving port, and the solution of different refractivity is respectively from glass tube
The solution in glass tube is discharged from other end after the test is finished for a port input.
As shown in figure 3, the embodiment of the present invention shows pair of light source light spectrum Yu interference-type optical fiber spr sensor output spectrum
Than figure, wherein abscissa indicates that wavelength, unit nm, ordinate indicate that optical power, unit dBm, solid black lines are light source
Spectrogram, black dotted lines are wide range figure of the light source after sensor.Since the observable spectrum maximum magnitude of spectrometer is
1000nm, because in the embodiment of the present invention, spectrometer scanning wavelength range selects 600~1600nm.
For the ease of observation, spectrum is also divided into visible light region A and near infrared region B in Fig. 3；
According to two spectral lines of Fig. 3 paired observation it is found that since the spectral wavelength of visible light region A is relatively small, in addition to light
Outside the floating of power, this region spectrum does not have obvious interference fringe, thus the spectrum of visible light region A is mainly for detection of base
Change in the liquid refractivity of surface plasma body resonant vibration mechanism.
According to the near infrared region B spectrum on the right side of Fig. 3 it is found that light source is after interference-type optical fiber spr sensor, spectrum hair
Raw apparent interference fringe, this shows in this area segments, and due to the increase of optical wavelength, interference effect becomes more obvious, because
And the spectrum of near infrared region B mainly for detection of based on the multiple-mode interfence occurred in coreless fiber when interference spectrum variation.
So, the physical quantity sensitive to interference signal can be measured by the mobile realization of this interference fringe, including temperature, strain,
Load, refractive index etc..
Sensitivity and interferometric optical fiber sensor for interference-type optical fiber spr sensor provided by verifying embodiment one
It is improved compared to having, the embodiment of the present invention is also in the A wave-length coverage of visible light region, by the glass tube of carrying sensor
The solution for injecting different size refractive index, analyzes different resonance absorbance spectrum curves, wherein the specific refraction of three kinds of different solutions
Rate is respectively 1.3342,1.3552,1.3762.
It is done as shown in figure 4, the embodiment of the present invention is shown using what the solution of different size refractive index was tested
Relate to type optical fiber SPR sensor output light spectrogram, wherein abscissa indicates wavelength, unit nm, and ordinate indicates optical power, single
Position is dBm, and solid line indicates that refractive index is 1.3342 spectrogram, and pecked line indicates that refractive index is 1.3552 spectrogram, and line is empty
Line indicates that refractive index is 1.3762 spectrogram.In Fig. 4, under surface plasmon resonance effect, under the conditions of different refractivity
Resonance absorbing peak is generated, and the wavelength peak of absorption peak drifts about with the variation of refractive index.
Fig. 4 is original absorbance spectrum, therefore its curve has " burr ", needs by mathematics smoothing processing, treated
Spectrum is as shown in figure 5, abscissa is wavelength in Fig. 5, and unit nm, ordinate is normalized intensity, and solid line indicates that refractive index is
1.3342 spectrogram, pecked line indicate that refractive index is 1.3552 spectrogram, and line dotted line indicates that refractive index is 1.3762 light
Spectrogram can be clearly apparent at this time, and as solution refractive index increases, the wavelength peak of resonance absorbing peak is mobile to long wavelength and right
The wavelength sensitivity answered is about 2397.6nm/RIU.
Complex chart 4 and Fig. 5 are defeated using wide spectrum optical it is found that for the interference-type optical fiber spr sensor that embodiment one is proposed
Enter and acquire corresponding transmitted spectrum signal, it, can be former based on surface plasma body resonant vibration using the spectrum change of visible light region A
Reason realizes the high-sensitivity measurement of refractive index；Using the spectrum change of near infrared region B, can be based on principle of interference can be real
The sensor monitoring of existing multiple physical quantitys, such as temperature, strain, load etc..And since two parts measure independently based on different
Sensing principle, measurement process is mutually unaffected, greatly optimizes sensor performance.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although previous embodiment
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of interference-type optical fiber spr sensor, which is characterized in that including the first single mode optical fiber, the second single mode optical fiber and centreless
Optical fiber；
The coreless fiber is fixed between first single mode optical fiber and second single mode optical fiber；
The coreless fiber includes the metal-coated surface of coreless fiber main body described in coreless fiber main body and covering part, described
Coreless fiber main body and the metal-coated surface constitute surface plasma resonance structural body；
When the interference-type optical fiber spr sensor measures, external incident light wave is by first single mode optical fiber or second list
Mode fiber input；
When the incident light wave propagates to the contact surface of first single mode optical fiber and the coreless fiber or propagate to described the
When two single mode optical fibers and the contact surface of the coreless fiber, multiple-mode interfence occurs in the coreless fiber, the coreless fiber is covered
Plasma resonance occurs for the surface for being stamped metal film.
2. interference-type optical fiber spr sensor as described in claim 1, which is characterized in that further include spectrometer；
When external incident light wave is inputted by first single mode optical fiber, second single mode optical fiber is not contacted with the coreless fiber
One end connect with spectrometer；
When external incident light wave is inputted by second single mode optical fiber, first single mode optical fiber is not contacted with the coreless fiber
One end connect with spectrometer；
The spectrometer analyzes the absorption spectra of the surface plasma resonance structural body for the spectrum according to visible light region
In, the drift value of wavelength peak；
The spectrometer is also used to the spectrum according near infrared region, when analyzing generation multiple-mode interfence in the coreless fiber, institute
The drift value of the wavelength peak of the interference spectrum of output.
3. interference-type optical fiber spr sensor as described in claim 1, which is characterized in that first single mode optical fiber and described
Second single mode optical fiber includes fibre cladding and the fiber core that is placed among the fibre cladding；
The coreless fiber center is aligned with the fiber core center of first single mode optical fiber and second single mode optical fiber.
4. interference-type optical fiber spr sensor as described in claim 1, which is characterized in that the metal-coated surface includes pre-
If the golden metal film of thickness.
5. interference-type optical fiber spr sensor as claimed in claim 4, which is characterized in that the gold metal film is splashed by magnetic control
Coating machine is penetrated to be plated in coreless fiber main body.
6. interference-type optical fiber spr sensor as described in claim 1, which is characterized in that the coreless fiber main body includes two
Silica material.
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| CN111928880A (en) * | 2020-09-03 | 2020-11-13 | 东北大学 | Mach-Zehnder interference optical fiber based on surface plasma effect and sensor thereof |
| CN113514421A (en) * | 2021-04-25 | 2021-10-19 | 南京邮电大学 | Optical fiber sensor for trace organic molecules in water |
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