CN208043656U - A kind of SPR fibre optical sensors based on temperature self-compensation - Google Patents
A kind of SPR fibre optical sensors based on temperature self-compensation Download PDFInfo
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- CN208043656U CN208043656U CN201820441273.3U CN201820441273U CN208043656U CN 208043656 U CN208043656 U CN 208043656U CN 201820441273 U CN201820441273 U CN 201820441273U CN 208043656 U CN208043656 U CN 208043656U
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Abstract
The utility model discloses a kind of SPR fibre optical sensors based on temperature self-compensation, the SPR fibre optical sensors include a single-mode fiber and are connected to the multimode fibre at single mode optical fiber both ends, single mode optical fiber respectively includes single mode optical fiber fibre core, single mode optical fiber covering, first layer metal film and second layer metal film from inside to outside, multimode fibre respectively includes multimode fibre fibre core and multimode fibre covering from inside to outside, and the central shaft of single mode optical fiber fibre core and multimode fibre fibre core is point-blank.SPR fibre optical sensors can not only generate SPR effects, but also the structure with FP chambers.Manufacture craft is simple, cheap, realizes high-precision, the detection and analysis of highly sensitive sample refractive index, all has good foreground in all kinds of detection fields.
Description
Technical field
The utility model is related to technical field of optical fiber sensing, specifically a kind of SPR optical fiber based on temperature self-compensation passes
Sensor.
Background technology
Surface plasma body resonant vibration (Surface Plasmon Resonance, SPR) is a kind of physical optics phenomenon, when
The optical fiber surface that light beam injection is coated with certain thickness metallic film is totally reflected, and when meeting certain condition, light is coupled
Into metallic film, electronics is caused to resonate, that is, generates SPR effects.Since SPR phenomenons are to the medium refraction index of metal surface
It is very sensitive, related transducer related with refractive index can be carried out.Compared with traditional sensors, optical fiber SPR sensor has miniature
The advantages that change, high sensitivity, electromagnetism interference, fast response time.Since SPR effects have very high sensitivity, to extraneous ring
The variation in border is very sensitive, therefore more demanding to sensed condition, and most optical fiber SPR sensors are applied to scientific research field more.Cause
This needs designs the highly sensitive, optical fiber SPR sensor with self-compensating function.
Germany scientist Otto and Kretschmann propose the design structure of different SPR sensors, the two
All it is to use prism as in the carrier of conduction light wave.In recent years, the SPR of prism-type produced a series of progress.2012
Thomas et al. proposes a kind of sensor for measuring the novel SPR of carbon dioxide.The advantage of the sensor is can
To realize that continuity detects, and solubilised state and gaseous carbon dioxide can be detected.Yanase in 2013 et al. is proposed
It is used to detect its refractive index under the refractive index and stimulation of individual living cells in conjunction with the SPR sensors of CMOS cameras.
Seung-A in 2013 et al. has studied plasticised polyvinyl chloride（PVD）Sense influence of the layer thickness to SPR sensor performances.
Zhiyou in 2014 et al. proposes a kind of surface plasma resonance sensor of three-layer metal structure.2015
Nizamov et al. proposes a kind of SPR sensors of the novel self-reference based on micro- printing.Measured zone half region is
Sensing unit the other half be reference area.Graphical modification is done in measurement zone using micro- contact impact system and is used as survey area, unmodified area
Domain, which is used as, refers to area.It is advantageous that not needing individual Measurement channel to make the reference of SPR signals.
From optical fibre Fabry-perot (optical fiber Fabry-P é rot, F-P) sensor in 1988 by Lee
Since C E et al. successfully make, the measurement of the different kinds of parameters such as temperature, strain, pressure, vibration has been widely used in it.This sensor
Have many advantages, such as high sensitivity, small, fast response time, electromagnetism interference.
Patent document CN106442419A discloses a kind of self compensation SPR optical fiber biochemical sensors, by miniature quartz capillary
Pipe is coated with the gold nanoparticle of golden film and fixed single layer respectively as sensing element, in its surface adjacent regions, and inside it
Deionized water is injected, the body compensation of refractive index channels LSPR and FP temperature-compensatings channel are formed, this structure equally also uses certainly
The method of compensation improves the precision of sensor.Patent document CN105738325A discloses a kind of bilateral grinding of multi-clad
Type SPR dual sampling devices, the SPR dual sampling devices based on the bilateral grinding of more coverings are in bilateral grinding multi-clad
First layer metal material and second layer metal material on plated film on X-direction abradant surface, metal material on plated film on Y-direction abradant surface
Material.The difference of the parameters such as two facet coatings materials causes corresponding SPR loss spectras different to external environment parameters sensitivity, therefore when outer
When boundary's environmental change, two loss spectra variations are different, and to reach double-sensing purpose, this structure can accomplish to measure simultaneously double
Parameter.But all there is complicated, complex manufacturing technology in them, the higher problem of cost, and the value of practical application is not high.
Invention content
The purpose of this utility model be for the above-mentioned prior art in deficiency, provide a kind of at low cost, highly sensitive, high
The SPR fibre optical sensors based on temperature self-compensation of precision.
The purpose of this utility model is achieved through the following technical solutions：
A kind of SPR fibre optical sensors based on temperature self-compensation, including a single-mode fiber and it is connected to the list
The multimode fibre at mode fiber both ends, the single mode optical fiber respectively include single mode optical fiber fibre core, single mode optical fiber covering, from inside to outside
Layer of metal film and second layer metal film, the multimode fibre respectively include multimode fibre fibre core and multimode fibre packet from inside to outside
Layer, the central shaft of the single mode optical fiber fibre core and multimode fibre fibre core point-blank, the first layer metal film and second
Gold or silver or copper or aluminium is respectively adopted in layer metal film.
In the further design scheme of the utility model, the material of above-mentioned first layer metal film is silver, the second layer gold
The material for belonging to film is gold.
In the further design scheme of the utility model, the length of above-mentioned single mode optical fiber is 10mm, the single mode optical fiber and
A diameter of 125 μm of multimode fibre, the single mode optical fiber core diameter are 10 μm, and the multimode fibre core diameter is 50 μm.
In the further design scheme of the utility model, first layer metal film thickness is 40nm~50nm, second layer metal
Film thickness is 10nm~20nm.
The utility model has advantageous effect following prominent：
The SPR fibre optical sensors of the utility model can both generate SPR effects, to measure the refractive index of sample, simultaneously
Structure with FP chambers again, can be with measuring environment temperature, to compensate the mistake that ambient temperature generates SPR detection signals
Difference.High-precision can be realized without additional compensation to detect.In addition the production method of the SPR fibre optical sensors is ground without polishing
The complexity means such as mill, laser processing, chemical attack, only need to melt multimode fibre and single mode optical fiber using optical fiber splicer
It is connected together, manufacture craft is simple, cheap, realizes high-precision, the detection and analysis of highly sensitive sample refractive index.Each
Class detection field all has good foreground.
Description of the drawings
Fig. 1 is the SPR optical fibre sensor structure schematic diagrams of non-overlay film in embodiment；
Fig. 2 is the SPR optical fibre sensor structure schematic diagrams of overlay film in embodiment；
In figure, 1- multimode fibre coverings, 2- multimode fibre fibre cores, 3- single mode optical fiber coverings, 4- single mode optical fiber fibre cores, 5- is more
Mode fiber covering, 6- multimode fibre fibre cores, 7- second layer metal films, 8- first layer metal films.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and embodiments.
Embodiment 1
When ambient temperature changes, the spectroscopic data of existing SPR fibre optical sensors can change accordingly, be embodied in altogether
It shakes the movement at peak.Measurement accuracy is caused to decline to change.Therefore it needs to take certain measure to carry out compensation temperature variation to draw
The variation of the spectroscopic data risen.
Referring to attached drawing 1 and attached drawing 2, a kind of SPR fibre optical sensors based on temperature self-compensation of the utility model, including one
Section single-mould fiber and the multimode fibre for being connected to single mode optical fiber both ends, single mode optical fiber respectively include single mode optical fiber from inside to outside
Fibre core, single mode optical fiber covering, first layer metal film and second layer metal film, multimode fibre respectively include multimode fibre from inside to outside
The central shaft of fibre core and multimode fibre covering, single mode optical fiber fibre core and multimode fibre fibre core point-blank, first layer metal
The material of film is silver, and the material of second layer metal film is gold.The length of single mode optical fiber is 10mm, single mode optical fiber and multimode fibre
A diameter of 125 μm, single mode optical fiber core diameter is 10 μm, and multimode fibre core diameter is 50 μm.First layer metal film thickness is
40nm~50nm, second layer metal film thickness are 10nm~20nm.
Referring to Fig. 1, in the SPR fibre optical sensors of the utility model, the right side of left side multimode fibre and the right multimode light
Fine left side constitutes the structure of FP chambers, and the monitoring of temperature may be implemented using the principle of FP fibre optical sensors.In optical fiber
The phase of the light of middle propagation by fibre-optic waveguide physical length;Optical fibre refractivity radial distribution;The lateral geometry of fibre-optic waveguide
Three factors of size determine.When sensor is placed in the environment of temperature change, due to the thermo-optic effect and fiber optic materials of optical fiber
Thermal expansion effects can directly cause the variation of three factors above, to generate phase change.The variation of phase is proportional to temperature
Variation, therefore by FP fibre optical sensors, i.e. the SPR fibre optical sensors of the utility model measure phase change, so that it may to obtain
Temperature change to be measured.Then pass through the movement at the peaks SPR caused by certain algorithm compensation temperature.
Referring to Fig. 2, in the SPR fibre optical sensors of the utility model, by multimode fibre-single mode optical fiber-multimode fibre and
The double layer of metal film on single mode optical fiber surface constitutes spr sensor structure, and the cardinal principle of the spr sensor of the utility model is
When incident light injects single mode optical fiber by multimode fibre, due to the light there are many pattern in multimode fibre, and in single mode optical fiber only
There is the light of one mode, to which the cladding mode in single mode optical fiber can be inspired, to excite metallic surface plasma wave,
When evanescent wave wave vector is identical as the wave vector of metallic surface plasma wave, then SPR effects can be excited.Incident optical energy at this time
Amount is absorbed by surface plasma wave so that portion of energy drastically declines, so as to observe apparent absorption peak.Metal film
The selection of material is typically gold, silver, copper, aluminium.It is very high with its plated film sensitivity for gold, but signal-to-noise ratio can be relatively low, and it is silver-colored
It is then that sensitivity is relatively low, signal-to-noise ratio can be very high, and unstable chemcial property, is oxidized easily.Copper and aluminium are also used as film,
With with similar property.Metallic combination mode has been selected in the present embodiment to solve the contradiction of sensitivity and signal-to-noise ratio, inside
Layer choosing selects the silver of high sensitivity, plates one layer of thin layer gold again outside to improve the stability of sensor, and composite metal membrane can be with
Increase the sensitivity of sensor.
The production method of the SPR fibre optical sensors based on temperature self-compensation of the utility model, specifically includes following steps：
Step 1, optical fiber includes three layers, outmost coat, covering and core layer, by single mode optical fiber and multimode fibre
The coat of outside is removed, and is made marks to single mode optical fiber and multimode fibre, following welding is convenient for.
Step 2, the end face of one root multimode fiber and a single mode optical fiber is cut flat with cutter, it will using optical fiber splicer
Multimode fibre and single mode optical fiber are welded together.
Step 3, the other end of single mode optical fiber is cut flat with cutter, makes the length of single mode optical fiber in 10mm or so, then
Another root multimode fiber end face is cut flat with, with optical fiber splicer by the other end of the single mode optical fiber of step 2 welding multimode fibre
It is fused to together with multimode fibre.
Step 4, in multimode fibre-single mode optical fiber-multimode fibre structure that above-mentioned steps 2, step 3 are formed, using magnetic
Control sputtering method sputters the Ag films of a layer thickness 40nm~50nm thickness on single mode optical fiber cross section, then is sputtered on Ag films layer
The gold thin film of one layer of 10nm~20nm thickness.
When experiment measures, at 25 DEG C of room temperature, wideband light source is transferred to the spr sensor by optical fiber, is sensing
Region is detected sample modulation, and it is sodium chloride solution that refractive index, which detects sample, and is calibrated using Abbe refractometer instrument, with
The variation of sample refractive index, SPR absorption peaks generate corresponding movement, track peak method measurement refractive index by peak value and resonate with SPR
The relationship at peak.By heating sodium chloride solution, it is used in combination temperature to measure the temperature of solution, while observing what spectrometer demodulated
FP transmission spectrums obtain the variation of the corresponding transmitted spectrum of specific temperature change, are then caused by certain algorithm compensation temperature
The peaks SPR movement.
It is the preferred embodiment of the utility model above, it is all to change according to made by technical solutions of the utility model, it is produced
Function without departing from technical solutions of the utility model range when, belong to the scope of protection of the utility model.
Claims (4)
1. a kind of SPR fibre optical sensors based on temperature self-compensation, which is characterized in that including a single-mode fiber and be separately connected
Multimode fibre in the single mode optical fiber both ends, the single mode optical fiber respectively include single mode optical fiber fibre core, single-mode optics from inside to outside
Fine covering, first layer metal film and second layer metal film, the multimode fibre respectively include from inside to outside multimode fibre fibre core and
Point-blank, the first layer is golden for the central shaft of multimode fibre covering, the single mode optical fiber fibre core and multimode fibre fibre core
Belong to film and gold or silver or copper or aluminium is respectively adopted in second layer metal film.
2. the SPR fibre optical sensors according to claim 1 based on temperature self-compensation, which is characterized in that the first layer
The material of metal film is silver, and the material of the second layer metal film is gold.
3. the SPR fibre optical sensors according to claim 1 based on temperature self-compensation, which is characterized in that the single-mode optics
Fine length is 10mm, and a diameter of 125 μm of the single mode optical fiber and multimode fibre, the single mode optical fiber core diameter is 10 μ
M, the multimode fibre core diameter are 50 μm.
4. the SPR fibre optical sensors according to claim 1 based on temperature self-compensation, which is characterized in that the first layer
Thickness of metal film is 40nm~50nm, and second layer metal film thickness is 10nm~20nm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414474A (en) * | 2018-03-30 | 2018-08-17 | 南京信息工程大学 | A kind of SPR fibre optical sensors and preparation method thereof based on temperature self-compensation |
| CN110207760A (en) * | 2019-07-08 | 2019-09-06 | 南京信息工程大学 | The fibre optical sensor and preparation method thereof of temperature and humidity is detected simultaneously |
-
2018
- 2018-03-30 CN CN201820441273.3U patent/CN208043656U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414474A (en) * | 2018-03-30 | 2018-08-17 | 南京信息工程大学 | A kind of SPR fibre optical sensors and preparation method thereof based on temperature self-compensation |
| CN110207760A (en) * | 2019-07-08 | 2019-09-06 | 南京信息工程大学 | The fibre optical sensor and preparation method thereof of temperature and humidity is detected simultaneously |
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Granted publication date: 20181102 Termination date: 20200330 |