CN108387555A - A kind of multi-cascade plasma resonance sensing system - Google Patents
A kind of multi-cascade plasma resonance sensing system Download PDFInfo
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- CN108387555A CN108387555A CN201810059441.7A CN201810059441A CN108387555A CN 108387555 A CN108387555 A CN 108387555A CN 201810059441 A CN201810059441 A CN 201810059441A CN 108387555 A CN108387555 A CN 108387555A
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- optical fiber
- solution
- light
- refractive index
- sensor
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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
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
- G01N21/553—Attenuated total reflection and using surface plasmons
Abstract
The present invention discloses a kind of multi-cascade plasma resonance sensing system,The system includes light source,Optical waveguide,Spectra collection and processing unit and several optical fiber surface plasmon resonance body spr sensors,Several optical fiber SPR sensors are cascaded by optical waveguide,The light that light source is sent out is transmitted to each optical fiber SPR sensor by optical waveguide,The optical fiber SPR sensor includes that solution places channel,The dielectric material and plasmasphere of changeable refractive index,The refractive index of solution to be measured in channel can be placed according to solution to adjust the refractive index of dielectric material,Change the service band of optical fiber SPR sensor,The refractive index of solution to be measured is set to detect operation interval in optical fiber SPR sensor refractive index,Simultaneously,By changing the service band of optical fiber SPR sensor come the service band of each sensor of reasonable distribution,So that a set of resonance sensing system can support multiple sensors to work at the same time,Relative to the more set sensor-based systems for using the prior art,Cost is saved.
Description
Technical field
The present invention relates to test equipment technology more particularly to a kind of multi-cascade plasma resonance sensing systems.
Background technology
Existing surface plasma body resonant vibration (Surface Plasmon resonance, SPR) sensor is by light
Nano level metal sensing layer is deposited on the surface of waveguide medium and manufactured.The light conducted in optical waveguide medium reaches medium
When with the interface of metal, meeting the part light of the plasma resonance condition in metal layer can be absorbed by metal layer, and convert
At the oscillation energy of metal layer plasma, light will appear the missing of the part light, such as Fig. 1 by the spectrum after sensor
Shown, spectrum will appear the form of formant, and the position of the formant can move, sensor with extraneous variations in refractive index
Extraneous refractive index can be detected according to the one-to-one relationship of resonant positions and extraneous refractive index.
Existing optical fiber SPR sensor conducts light due to the use of optical fiber, and the refractive index of fiber core is fixed, makes light
The service band of fine spr sensor is fixed, can not adjust the service band of optical fiber SPR sensor, and existing optical fiber
Sensor is not fully used just with partial spectrum range, most spectral region so that most of spectrum
Range is wasted, several optical fiber SPR sensors of connecting in a set of sensing and detecting system as a result, and each sensor is distributed
To different spectral detection sections, large-scale spectral detection can be made full use of, but in the prior art, due to optical fiber
The fiber core refractive index of sensor is the same, and multiple concatenated sensing and detecting systems of optical fiber SPR sensor work in same light
Detection interval is composed, being used in series for multiple sensors in a set of detecting system is cannot achieve.
Invention content
The main purpose of the present invention is to provide a kind of multi-cascade plasma resonance sensing systems, for solving existing skill
Since optical fiber SPR sensor service band is fixed in art, multiple optical fiber SPR sensor series connection in a set of detecting system are cannot achieve
The technical issues of use.
To achieve the above object, the present invention provides a kind of multi-cascade plasma resonance sensing system, the system comprises：
Light source, optical waveguide, spectra collection and processing unit and several optical fiber surface plasmon resonance body spr sensors；
Several described optical fiber SPR sensors are cascaded, and pass through the light between two optical fiber SPR sensors
Waveguide connects, and the light that the light source is sent out is transmitted to by the optical waveguide in each optical fiber SPR sensor；
The optical fiber SPR sensor include solution place channel, changeable refractive index dielectric material and plasmasphere；
The interior surface layers that the solution places channel are the dielectric material, and it is to be measured for placing that the solution places channel
Solution, the plasmasphere of the dielectric material and the interface setting thin layer of the solution to be measured；
The light that the light source is sent out is transmitted to by the optical waveguide in the solution to be measured, and the light is in the medium material
Expect that the interface with the solution to be measured is totally reflected, resonance, which occurs, with plasma in the plasmasphere generates SPR
Signal is detected, the reflected light of the total reflection carries the SPR and detects signal；
The spectra collection processing unit is used to acquire and handle the reflected light for carrying SPR detection signals, exports SPR
Detection information, the SPR detection informations carry the solution refractive index information to be measured.
From a kind of multi-cascade plasma resonance sensing system of above-mentioned offer it is found that first aspect：Light in the system
Fine spr sensor include solution place channel, changeable refractive index dielectric material and plasmasphere, solution place channel place
The refractive index of solution to be measured, dielectric material is changeable, can place the refractive index of solution to be measured in channel according to solution and be situated between to adjust
The refractive index of material makes the refractive index of solution to be measured in the optical fiber to change the service band of optical fiber SPR sensor
Sensor refractive index detect operation interval；Second aspect：The system include light source, optical waveguide, spectra collection and processing unit and
Several optical fiber SPR sensors, several optical fiber SPR sensors are cascaded, and the service band of optical fiber SPR sensor can change
Become, by changing the service band of optical fiber SPR sensor come the service band of each sensor of reasonable distribution so that a set of resonance
Sensor-based system can support multiple sensors to work at the same time, and relative to the more set sensor-based systems for using the prior art, save cost.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those skilled in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the normalization light spectrogram of Fiber Optic Sensor Based on Surface Plasmon Resonance；
Fig. 2 is a kind of structural schematic diagram of multi-cascade plasma resonance sensing system provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the Fiber Optic Sensor Based on Surface Plasmon Resonance provided in the embodiment of the present invention；
Fig. 4 is the normalization light spectrogram of multi-cascade plasma resonance sensing system.
Specific implementation mode
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described reality
It is only a part of the embodiment of the present invention to apply example, and not all embodiments.Based on the embodiments of the present invention, people in the art
The every other embodiment that member is obtained without making creative work, shall fall within the protection scope of the present invention.
Since optical fiber SPR sensor service band is fixed in the prior art, multiple light in a set of detecting system are cannot achieve
The technical issues of fine spr sensor is used in series.In order to solve the above-mentioned technical problem, the present invention proposes a kind of multi-cascade plasma
Resonance body sensor-based system.The multi-cascade plasma resonance sensing system is used for multiple solution, multiple sewage samples and multiple lifes
It is detected whiles changing sample etc..Wherein, strength of fluid, the pollution level of sewage, biochemical sample Parameters variation etc. can cause
The variation of liquid refractivity.
Referring to Fig. 2, Fig. 2 is a kind of structure of multi-cascade plasma resonance sensing system provided in an embodiment of the present invention
Schematic diagram, the multi-cascade plasma resonance sensing system include：If light source 1, optical waveguide 2, spectra collection and processing unit 3 and
Dry optical fiber SPR sensor 4, several optical fiber SPR sensors 4 are cascaded, and pass through light between two optical fiber SPR sensors 4
Waveguide 2 connects, and the light that light source 1 is sent out is transmitted to by optical waveguide 2 in each optical fiber SPR sensor 4.
Specifically, which includes that light source 1, optical waveguide 2, spectra collection and processing are single
Member 3 and several optical fiber SPR sensors 4, several optical fiber SPR sensors 4 form an optical fiber SPR sensor group by series connection,
It is connected by optical waveguide 2 between two optical fiber SPR sensors 4 in the optical fiber SPR sensor group, meanwhile, light source 1 and the optical fiber
Between spr sensor group, connected by optical waveguide 2 between the optical fiber SPR sensor group and spectra collection and processing unit 3.
Wherein, as shown in figure 3, Fig. 3 is the Fiber Optic Sensor Based on Surface Plasmon Resonance provided in the embodiment of the present invention
Structural schematic diagram, optical fiber SPR sensor 4 include：Solution place channel 5, changeable refractive index dielectric material 6 and plasmasphere
7, the interior surface layers that solution places channel 5 are dielectric material 6, and solution places channel 5 for placing solution to be measured, dielectric material 6
The plasmasphere 7 of thin layer is set with the interface of solution to be measured, and the light 8 that light source 1 is sent out is transmitted to solution to be measured by optical waveguide 2
In, light 8 is totally reflected on the interface of dielectric material 6 and solution to be measured, is occurred altogether with plasma in plasmasphere 7
It shakes and generates SPR detection signals, the reflected light of the total reflection carries SPR detection signals, and spectra collection and processing unit 3 are for adopting
Collect and handle the reflected light for carrying SPR detection signals, export SPR detection informations, which carries solution folding to be measured
Penetrate rate information.
Specifically, in the multi-cascade plasma resonance sensing system each optical fiber SPR sensor structure all same, light
Fine spr sensor 4 includes：Solution place channel 5, changeable refractive index dielectric material 6 and plasmasphere 7, solution is placed logical
Solution to be measured is placed in road 5, and it is dielectric material 6 that solution, which places the interior surface layers in channel 5, in dielectric material 6 and solution to be measured
Interface on plasmasphere 7, the light source 1 of setting thin layer send out the process optical waveguide 2 of light and enter each optical fiber SPR sensor
Solution to be measured in, light is totally reflected on the interface of dielectric material 6 and solution to be measured, wherein the thickness of plasmasphere 7
Only tens nanometers, therefore plasmasphere 7 is totally reflected incident light on the interface of solution to be measured and dielectric material 6
Influence can be ignored.Light occurs resonance with plasma in plasmasphere 7 and generates SPR detection signals, the total reflection
Reflected light carry SPR detection signals, spectra collection and processing unit 3 acquire and handle the reflection for carrying SPR detection signals
Light exports SPR detection informations, obtains the refractive index information in solution to be measured.
It is placed in channel 5 it should be noted that solution to be measured is located at solution, solution to be measured fills up solution and places channel 5, makes
Light transmits in solution to be measured, and solution to be measured connects the light path of optical fiber SPR sensor as light-conductive media.
It should also be noted that, dielectric material 6 is low refractive index dielectric material, the refractive index of dielectric material 6 is changeable.
Further, the refractive index of dielectric material 6 can be changed by applying voltage or changing temperature, can also passes through doping
Other dielectric materials change the refractive index of dielectric material 6, so that the refractive index of dielectric material 6 is modulated.
Further, plasmasphere 7 is metallic plasma layer or the semi-conducting material with abundant charged particle.
Wherein, there is plasma in metallic plasma layer and semi-conducting material with abundant charged particle, it should
Plasma is like charges charged particle, and plasma meets with the evanescent waves generated during light total reflection and resonates,
Part meets the energy of the incident light of resonance condition by plasma absorption, the part light of absorbed energy is converted to etc. from
The oscillation energy of daughter wave 9, to make the spectrum of reflected light part light missing occur, as shown in Figure 1, the spectrum of reflected light can produce
Raw formant, wherein the missing that the SPR detection signals that resonance generates later are the light of reflected beam portion wavelength occurs, i.e., should
Reflected light carries SPR and detects signal.
Further, the refractive index of dielectric material 6 is less than the refractive index of solution to be measured, so that light is incident on from solution to be measured
In dielectric material 6, it can be totally reflected.
Further, as shown in figure 3, optical fiber SPR sensor 4 further includes sensing passage substrate 10, liquid inlet 11 and liquid
Body outlet 12, the channel both ends of sensing passage substrate 10 are arranged optical waveguide 2, two optical waveguides 2 in 10 channel of sensing passage substrate
Between be partly that solution places channel 5 so that optical waveguide outputs and inputs light in solution to be measured, 10 liang of sensing passage substrate is outer
There is external part in side, which is respectively set liquid inlet 11 and liquid outlet 12, liquid inlet 11 and liquid outlet 12 with
Solution is placed channel 5 and is connected to, and makes the solution that solution is placed in channel 5 that can be inputted from liquid inlet 11, is exported from liquid outlet 12,
The solution to be measured being convenient for changing in solution placement channel 5, to change the light-conductive media of optical fiber SPR sensor 4.
Wherein, optical waveguide 2 is arranged in the channel both ends of sensing passage substrate 10 so that leads between two optical fiber SPR sensors 4
Cross the connection of optical waveguide 2.
Further, light source 1 is passed by first optical fiber in optical waveguide 2 and several concatenated optical fiber SPR sensors
Sensor connects, and spectra collection and processing unit 3 pass through the last one light in optical waveguide 2 and several concatenated optical fiber SPR sensors
Fine spr sensor connection.
Specifically, light source 1 is connect with first optical fiber SPR sensor of the optical fiber SPR sensor group, spectra collection and place
Reason unit 3 is connect with the last one spectra collection of optical fiber SPR sensor group and processing unit 3 so that the multi-cascade plasma
Resonance body sensor-based system is using the same light source and the same spectra collection and processing unit, and multiple optical fiber SPR sensors are one
It uses, economizes on resources in unjacketed optical fiber SPR sensorgram system.
It should be noted that the quantity of optical fiber SPR sensor is n, the value of n is not construed as limiting.
In embodiments of the present invention, the value of n takes 3, as shown in Fig. 2, the light that light source 1 is sent out is sequentially entered by optical waveguide 2
Optical fiber SPR sensor 401, optical fiber SPR sensor 402 and optical fiber SPR sensor 403, finally enter spectra collection and processing is single
Member 3 is acquired and processed output light spectrogram.Solution to be measured in each optical fiber SPR sensor is got by formant in spectrogram
Refractive index information.Wherein, the spectrogram that spectra collection and processing unit 3 export is as shown in figure 4, Fig. 4 is multi-cascade plasma
The normalization light spectrogram of resonance body sensor-based system, optical fiber SPR sensor 401, optical fiber SPR sensor 402 and optical fiber SPR sensor
403 3 fibre optical sensors work in different wave bands, have corresponding three formants in Fig. 4, three light can be obtained in Fig. 4
The refractive index information of solution to be measured in fine spr sensor, to obtain the other parameters of solution to be measured according to refractive index information.
Further, the dielectric material 6 in the multi-cascade plasma resonance sensing system in each optical fiber SPR sensor
Refractive index it is different so that the service band of each optical fiber SPR sensor is different.It is reflected in each optical fiber SPR sensor 4
In the case that rate detection range is smaller so that all optical fiber SPR sensors 4 work at the same time, and non-interference, realize efficiently and
Highly integrated refractive index detecting system.
Further, light source 1 is wideband light source, and wideband light source provides width for the multi-cascade plasma resonance sensing system
Spectral region light source so that the spectral region utilized by the multi-cascade plasma resonance sensing system is wider.
Further, optical waveguide 2 is multimode transmissions optical fiber, and the outer surface of the multimode transmissions optical fiber is additionally provided with optical fiber packet
Layer 13.
Optionally, can be replaced by can be by other optical waveguides of broadband light import system for multimode transmissions optical fiber.
From a kind of multi-cascade plasma resonance sensing system of above-mentioned offer it is found that first aspect：Light in the system
Fine spr sensor include solution place channel, changeable refractive index dielectric material and plasmasphere, solution place channel place
The refractive index of solution to be measured, dielectric material is changeable, can place the refractive index of solution to be measured in channel according to solution and be situated between to adjust
The refractive index of material makes the refractive index of solution to be measured in the optical fiber to change the service band of optical fiber SPR sensor
Sensor refractive index detect operation interval；Second aspect：The system include light source, optical waveguide, spectra collection and processing unit and
Several optical fiber SPR sensors, several optical fiber SPR sensors are cascaded, and the service band of optical fiber SPR sensor can change
Become, by changing the service band of optical fiber SPR sensor come the service band of each sensor of reasonable distribution so that a set of resonance
Sensor-based system can support multiple sensors to work at the same time, and relative to the more set sensor-based systems for using the prior art, save cost.
It is to a kind of description of multi-cascade plasma resonance sensing system provided by the present invention, for this field above
Technical staff, the thought of embodiment according to the present invention, there will be changes in the specific implementation manner and application range, comprehensive
On, the content of the present specification should not be construed as limiting the invention.
Claims (10)
1. a kind of multi-cascade plasma resonance sensing system, which is characterized in that the system comprises：Light source, optical waveguide, spectrum
Acquisition and processing unit and several optical fiber surface plasmon resonance body spr sensors；
Several described optical fiber SPR sensors are cascaded, and pass through the optical waveguide between two optical fiber SPR sensors
Connection, the light that the light source is sent out are transmitted to by the optical waveguide in each optical fiber SPR sensor；
The optical fiber SPR sensor include solution place channel, changeable refractive index dielectric material and plasmasphere；
The interior surface layers that the solution places channel are the dielectric material, and it is to be measured molten for placing that the solution places channel
Liquid, the plasmasphere of the dielectric material and the interface setting thin layer of the solution to be measured；
The light that the light source is sent out is transmitted to by the optical waveguide in the solution to be measured, the light the dielectric material with
The interface of the solution to be measured is totally reflected, and resonance, which occurs, with plasma in the plasmasphere generates SPR detections
Signal, the reflected light of the total reflection carry the SPR and detect signal；
The spectra collection processing unit is used to acquire and handle the reflected light for carrying SPR detection signals, output SPR detections
Information, the SPR detection informations carry the solution refractive index information to be measured.
2. system according to claim 1, which is characterized in that the optical fiber SPR sensor further includes：Sensing passage base
Bottom, liquid inlet and liquid outlet；
The channel both ends of the sensing passage substrate are arranged the optical waveguide, two light in the sensing passage substrate channel
It is partly that solution places channel between waveguide, so that the optical waveguide outputs and inputs light in the solution to be measured；
Two outside of the sensing passage substrate has external part, the external part that the liquid inlet and the liquid discharge is respectively set
Mouthful, the liquid inlet is placed channel with the solution with the liquid outlet and is connected to.
3. system according to claim 1, which is characterized in that the dielectric material is by adulterating other materials or by applying
Making alive or temperature change the refractive index of the dielectric material.
4. system according to claim 1, which is characterized in that the plasmasphere is metallic plasma layer or has
The semi-conducting material of abundant charged particle.
5. system according to claim 1, which is characterized in that the thickness of the plasmasphere is tens nanometers.
6. system according to claim 1, which is characterized in that the refractive index of the dielectric material is less than the solution to be measured
Refractive index.
7. system according to claim 1, which is characterized in that the light source passes through the optical waveguide and several concatenated institutes
First optical fiber SPR sensor connection in optical fiber SPR sensor is stated, the spectra collection and processing unit pass through the light wave
It leads and is connect with the last one optical fiber SPR sensor in several concatenated optical fiber SPR sensors.
8. system according to claim 1, which is characterized in that the medium in each described optical fiber SPR sensor
The refractive index of material is different, so that the service band of each optical fiber SPR sensor is different.
9. system according to claim 1, which is characterized in that the optical waveguide is multimode transmissions optical fiber or by the light guide
Enter other optical waveguides of system.
10. according to the system described in claim 1 to 9 any one, which is characterized in that the light source is wideband light source.
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Cited By (1)
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Application publication date: 20180810 |