CN105241848A - Liquid refractive index and temperature dual-parameter sensor, and preparation method thereof - Google Patents
Liquid refractive index and temperature dual-parameter sensor, and preparation method thereof Download PDFInfo
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- CN105241848A CN105241848A CN201510621160.2A CN201510621160A CN105241848A CN 105241848 A CN105241848 A CN 105241848A CN 201510621160 A CN201510621160 A CN 201510621160A CN 105241848 A CN105241848 A CN 105241848A
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Abstract
The invention discloses a liquid refractive index and temperature dual-parameter sensor, and a preparation method thereof. The liquid refractive index and temperature dual-parameter sensor comprises an input optical fiber, an output optical fiber, a capillary tube, and a water drop-shaped curved fiber bragg grating structure; the input optical fiber and the output optical fiber are welded onto the two ends of the water drop-shaped curved fiber bragg grating structure respectively, and are stretched out from the same side of the capillary tube; the water drop-shaped curved fiber bragg grating structure is arranged to be close to the capillary tube; the side of the water drop-shaped curved fiber bragg grating structure close to the capillary tube is fixedly connected with the capillary tube; the water drop-shaped curved fiber bragg grating structure comprises a section of a fiber bragg grating without a coating layer; and refractive index and temperature double parameter determination is realized based on different response of transmissive wave trough of the fiber bragg grating and interference wave trough of the water drop-shaped curved fiber bragg grating structure on temperature and refractive index. Compared with the prior art, the liquid refractive index and temperature dual-parameter sensor is compact in structure, low in cost, and simple in sensitivity; and the preparation method is simple.
Description
Technical field
The present invention relates to Fibre Optical Sensor and biochemical field, particularly relate to a kind of all-fiber refractive index and temperature dual sampling device and preparation method thereof based on curved fiber grating (FBG).
Background technology
Fibre Optical Sensor, because have the advantages such as volume is little, highly sensitive, electromagnetism interference, distance sensing are long, receives in recent years and pays close attention to widely and study.Refractive index and temperature, as two Important Parameters of liquid, are carried out in real time it, are measured accurately simultaneously and have great importance in fields such as biological and chemicals.Under normal circumstances, because the mould field in FBG is limited in fibre core inside, it is the sensitive of temperature but refractive index change is insensitive to external world.In order to realize the refractometry of FBG, a kind of method utilizes the covering of acid solution to FBG to corrode, by the covering reducing FBG, the evanscent field of core mode field and environmental liquids are interacted, cause FBG reflection wavelength to drift about with the change of environmental liquids refractive index, carry out refractive index by the change detecting FBG resonance wavelength and carry out sensing; Another method utilizes laser to etch FBG grid region covering, forms the structure of D type xsect, evanscent field can be made equally to contact with environmental liquids, thus realize the measurement of refractive index.But in the manufacturing process of these existing sensors, or need danger, complicated corrosion process or need special optical fiber etching apparatus and technology, each of which increases manufacture difficulty and the cost of sensor, hinder the practical of sensors with auxiliary electrode.Therefore, make structure simple, make the two parameteric light fiber sensor of FBG easy, with low cost and seem particularly important.
Summary of the invention
For above-mentioned prior art and Problems existing, the present invention proposes a kind of liquid refractivity and temperature dual sampling device and preparation method thereof, carry out the refractive index of liquid to external world by the change of two trough centre wavelengths in monitoring transmission spectrum and temperature is measured simultaneously.
The present invention proposes a kind of liquid refractivity and temperature dual sampling device, this sensor comprises input optical fibre 1, output optical fibre 2, kapillary 4 and drops curved fiber optical grating construction 6, input optical fibre 1, output optical fibre 2 are welded on the two ends of drops curved fiber optical grating construction 6 respectively, input optical fibre 1, output optical fibre 2 pass from kapillary 4 the same side, drops curved fiber optical grating construction 6 is near kapillary 4, and drops curved fiber optical grating construction 6 is fixed near kapillary 4 side and kapillary 4; Curved fiber optical grating construction 6 comprises the Fiber Bragg Grating FBG 5 that a section is removed coat;
The different responses of interference trough to temperature and refractive index that this sensor causes based on described Fiber Bragg Grating FBG 5 transmission trough and described drops curved fiber structure 6 realize refractive index and temperature two parameter measurement.
The invention allows for a kind of liquid refractivity and temperature dual sampling device method for making, the method comprises the following steps:
The coat in curved fiber grating grid region is divested and cleans with alcohol, as Fiber Bragg Grating FBG 5; The input optical fibre 1, the output optical fibre 2 that are welded on curved fiber grating two ends are passed from kapillary the same side, input optical fibre 1 connects wideband light source, output optical fibre 2 connects spectrometer Real-Time Monitoring transmission spectrum, to curved fiber grating end slip kapillary, drops curved fiber structure 6 is formed at curved fiber grating region, observing transmission spectrum simultaneously, significantly interfering trough to producing; Finally fix near curved fiber grating side point glue at kapillary 4.
Compared with prior art, sensor of the present invention has compact conformation, making is simple, cost is low, sensitivity advantages of higher.
Accompanying drawing explanation
Fig. 1 is liquid refractivity of the present invention and temperature dual sampling device structural representation;
Fig. 2 be sensor be in extraneous refractive index be 1.0 and temperature be transmission spectrum schematic diagram under the environment of 20 DEG C;
Fig. 3 is the situation of change schematic diagram of transmission spectrum with ambient temperature of sensor;
Fig. 4 is the situation of change schematic diagram of centre wavelength with ambient temperature of trough 1 and trough 2;
Fig. 5 is the situation of change schematic diagram of transmission spectrum with extraneous refractive index of sensor;
Fig. 6 is the situation of change schematic diagram of centre wavelength with extraneous refractive index of trough 1 and trough 2;
Reference numeral: 1, input optical fibre, 2, output optical fibre, 3, fixing glue, 4, kapillary, 5, Fiber Bragg Grating FBG (FBG); 6, curved fiber (FBG) optical grating construction.
Embodiment
Below in conjunction with the drawings and the specific embodiments, be described in further detail technical scheme of the present invention.
Below in conjunction with drawings and Examples, the present invention is described further:
As shown in Figure 1, sensor of the present invention is formed primarily of input optical fibre 1, output optical fibre 2, kapillary 4 and curved fiber grating (FBG) structure 5, wherein input optical fibre 1, output optical fibre 2 are welded on the two ends of curved fiber optical grating construction 5 respectively, input optical fibre 1, output optical fibre 2 pass from kapillary 4, until curved fiber optical grating construction 5 is near kapillary 4, drop-shaped curved fiber optical grating construction 5 is fixed with by fixing glue 3 and kapillary 4 near kapillary 4 side, and curved fiber optical grating construction 5 comprises the Fiber Bragg Grating FBG that a section is removed coat.
Used in this example is common commercial FBG, and its input optical fibre 1, output optical fibre 2 are standard single-mode fiber (CorningSMF-28); Fixing glue 3 adopts ultra-violet curing glue; Kapillary 4 is the glass tube of 3mm for internal diameter is 0.5mm length; The length being removed the fiber grating (comprising the grid region of FBG) of coat in curved fiber optical grating construction 5 is 25mm, and the radius-of-curvature of drops structure is 4.5mm.FBG is the abbreviation of FiberBraggGrating, i.e. Fiber Bragg Grating FBG.
The concrete manufacturing process of this sensor is: first, and the coat in curved fiber grating FBG grid region is divested and cleaned with alcohol; The input optical fibre 1, the output optical fibre 2 that are welded on FBG two ends are passed from kapillary the same side, input optical fibre 1 with connect wideband light source, output optical fibre 2 connects spectrometer Real-Time Monitoring transmission spectrum, slip kapillary is held to FBG, drops structure is formed in FBG region, observing transmission spectrum simultaneously, significantly interfering trough to producing; Finally fix near FBG side point glue at kapillary.(3) response curve of FBG transmission trough and warp architecture interference trough refractive index and temperature variation is demarcated by experiment respectively.The carrying out that namely calibrated sensor can be used to refractive index and temperature is to external world measured simultaneously.
Sensor of the present invention can be regarded as a FBG and the combination in drops warp architecture (as shown in Figure 1).For a broadband input optical signal, output spectrum is the superposition of FBG and warp architecture transmission spectrum.The two separately can be discussed for the ease of analyzing:
(1), for FBG, because the fibre core pattern in bragg wavelength place fl transmission is almost all coupled in the fibre core pattern of reverse transfers, therefore its transmission spectrum shows as and to form a sharp-pointed trough at bragg wavelength place;
(2), for a drop-shaped warp architecture, because the bending of optical fiber causes a part of fibre core pattern to enter covering, reflect again at covering and extraneous interphase, thus formation Whispering-gallery-mode, this pattern partial coupling when sweep transmits returns fibre core, interfere between output optical fibre place core mode and Whispering-gallery-mode, output spectra is formed the trough that one or more are wider;
In sum, the transmission spectrum of sensor of the present invention there will be two class troughs: a class is caused by FBG, a class is caused by drops warp architecture.The centre wavelength of this two classes trough all can along with the change of extraneous refractive index or temperature and linear change, but its slope is different, therefore, after demarcating, by monitoring the change of two class trough centre wavelengths simultaneously, refractive index to external world and temperature are measured simultaneously.
As shown in Figure 2, can see, the carefully sharp trough (trough 1) at 1539.2nm place is that FBG causes, and two other wider trough is then because warp architecture causes.Choose the trough 1 shown in figure and trough 2 as monitoring target, measure their center wavelength with temperature and the change of refractive index respectively, sensor is demarcated.
As shown in Figure 3, when extraneous refractive index remains 1.0, the centre wavelength of trough 1 and trough 2 is all along with the increase of temperature is moved to long wave direction, but the amplitude of movement is different.
As shown in Figure 4, visible trough 1 and the center wavelength with temperature linear change both trough 2, slope of a curve represents the sensitivity of respective center wavelength versus temperature change.Can find out, the sensitivity of the transmission paddy centre wavelength that this sample sensor FBG and drops warp architecture produce temperature variation is to external world respectively 9.8pm/ DEG C and 31.7pm/ DEG C; Y is dependent variable, represents the variable quantity of the centre wavelength of trough.In figure, x is independent variable, represents the size of ambient temperature; R represents the fitting coefficient of linear fit.
As shown in Figure 5 be that ambient temperature keeps 20 DEG C, the transmission spectrum of sensor is with the situation of change of extraneous refractive index.Can find out, the centre wavelength of trough 1 and trough 2 is all along with the increase of extraneous refractive index is moved to long wave direction.
Be illustrated in figure 6 the change curve of centre wavelength with extraneous refractive index of trough 1 and trough 2, all in good linear relationship.Fitting result show FBG and warp architecture for the sensitivity of trough centre wavelength variations in refractive index be to external world respectively 0.5050nm/RIU and 165.9276nm/RIU (RIU is unit refractive index).In figure, y is dependent variable, represents the variable quantity of the centre wavelength of trough; X is independent variable, represents the size of extraneous refractive index; R represents linearly dependent coefficient.
After demarcating this sensor, the response of sensor two troughs to temperature and variations in refractive index can be expressed as matrix form:
Wherein Δ T and Δ n represents the variable quantity of ambient temperature and refractive index, Δ λ
1with Δ λ
2represent the variable quantity of the centre wavelength of trough 1 and trough 2 respectively.Numeral in formula is exactly the sensitivity parameter determined with above-mentioned calibration process.According to above formula, as long as record the variable quantity of two trough centre wavelengths, the variable quantity of corresponding temperature and refractive index can be calculated, thus achieve measurement while temperature and refractive index.
In summary it can be seen, the sensor in the present invention has refractive index and thermometric ability simultaneously, and this sensor has, and cost of manufacture is low, simple and compact for structure, sensitivity advantages of higher.
Claims (2)
1. a liquid refractivity and temperature dual sampling device, it is characterized in that, this sensor comprises input optical fibre (1), output optical fibre (2), kapillary (4) and drops curved fiber optical grating construction (6), input optical fibre (1), output optical fibre (2) is welded on the two ends of drops curved fiber optical grating construction (6) respectively, input optical fibre (1), output optical fibre (2) passes from kapillary (4) the same side, drops curved fiber optical grating construction (5) is near kapillary (4), drops curved fiber optical grating construction (5) is fixed near kapillary (4) side and kapillary (4), curved fiber optical grating construction (6) comprises the Fiber Bragg Grating FBG (5) that a section is removed coat,
The interference trough that this sensor causes based on described Fiber Bragg Grating FBG (5) transmission trough and described drops curved fiber structure (6) responds temperature and the different of refractive index, realizes refractive index and temperature two parameter measurement.
2. liquid refractivity and a temperature dual sampling device method for making, it is characterized in that, the method comprises the following steps:
The coat in curved fiber grating grid region is divested and cleans with alcohol, as Fiber Bragg Grating FBG (5); The input optical fibre (1), the output optical fibre (2) that are welded on curved fiber grating two ends are passed from kapillary (4) the same side, input optical fibre (1) connects wideband light source, output optical fibre (2) connects spectrometer Real-Time Monitoring transmission spectrum, to curved fiber grating end slip kapillary (4), fiber grating (5) is caused to bend, form drops curved fiber optical grating construction (6), observing transmission spectrum simultaneously, significantly interfering trough to producing; Finally fix near curved fiber grating side point glue at kapillary (4).
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| CN106706030A (en) * | 2016-11-22 | 2017-05-24 | 西北工业大学 | Method for realizing simultaneous sensing of temperature, strain and refractive index through single fiber bragg grating |
| CN109709070A (en) * | 2018-12-29 | 2019-05-03 | 天津大学 | Composite fiber grating sensor and its refractive index and temperature double parameter measuring method |
| CN110470240A (en) * | 2019-08-16 | 2019-11-19 | 天津大学 | A kind of optical fiber curvature measurement sensor and preparation method thereof, measuring system |
| CN112577628A (en) * | 2020-12-14 | 2021-03-30 | 武汉理工大学 | High-sensitivity temperature sensor of cascade light reflection device of interferometer with strong evanescent field |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106706030A (en) * | 2016-11-22 | 2017-05-24 | 西北工业大学 | Method for realizing simultaneous sensing of temperature, strain and refractive index through single fiber bragg grating |
| CN106706030B (en) * | 2016-11-22 | 2019-03-01 | 西北工业大学 | The method that temperature, strain and refractive index sense simultaneously is realized using simple optical fiber Bragg grating |
| CN109709070A (en) * | 2018-12-29 | 2019-05-03 | 天津大学 | Composite fiber grating sensor and its refractive index and temperature double parameter measuring method |
| CN109709070B (en) * | 2018-12-29 | 2021-07-20 | 天津大学 | Refractive index and temperature double-parameter measuring method by using composite fiber grating sensor |
| CN110470240A (en) * | 2019-08-16 | 2019-11-19 | 天津大学 | A kind of optical fiber curvature measurement sensor and preparation method thereof, measuring system |
| CN112577628A (en) * | 2020-12-14 | 2021-03-30 | 武汉理工大学 | High-sensitivity temperature sensor of cascade light reflection device of interferometer with strong evanescent field |
| CN112577628B (en) * | 2020-12-14 | 2023-01-17 | 武汉理工大学 | High-sensitivity temperature sensor of cascade light reflection device of interferometer with strong evanescent field |
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