CN109682779A - Femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method - Google Patents
Femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method Download PDFInfo
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- CN109682779A CN109682779A CN201910041909.4A CN201910041909A CN109682779A CN 109682779 A CN109682779 A CN 109682779A CN 201910041909 A CN201910041909 A CN 201910041909A CN 109682779 A CN109682779 A CN 109682779A
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- refractive index
- fiber
- sensing
- femtosecond laser
- fiber core
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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
- G01N21/41—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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- 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 discloses femtosecond laser and prepares fiber core mismatch type FBG temperature strain refractive index measurement method, which comprises the steps of: 1) the fiber core mismatched structures preparation based on arc discharge；2) the FBG preparation based on femtosecond laser；3) temperature refraction rate sensing testing system measures, and fibre optical sensor is placed in warm table surface, is connected by fiber optical circulator with light source, optical fiber sensing analyzer；Fibre optical sensor is placed in warm table surface, changes temperature height using it；Testing liquid is dripped in sensitive zones by rubber head dropper, carries out refractive index sensing measurement；4) Strain refraction rate sensing testing system measures, and fibre optical sensor is placed in beam of uniform strength surface, is connected by fiber optical circulator with light source, optical fiber sensing analyzer；Change strain height using it, testing liquid is dripped in sensitive zones by rubber head dropper, carries out refractive index sensing measurement.It can avoid electromagnetic interference, high temperature resistant is, it can be achieved that temperature strain refractive index measures simultaneously.
Description
Technical field
The invention belongs to fiber optic sensing device fields, and in particular to a kind of femtosecond laser prepares fiber core mismatch type FBG temperature
Strain refraction rate measurement method.
Background technique
Fibre optical sensor is with many good characteristics and with very extensive application value, it can be achieved that under complex environment
Measure work.It has the characteristics that electromagnetism interference, anti-radiation, high sensitivity, light-weight, insulation explosion-proof, corrosion-resistant, and optical fiber
Size is small, has good optical transmission performance.It is normal in fiber bragg grating (Fiber Bragg Grating, FBG)
The senser element seen has the advantages such as structure is simple, small in size, dynamic range is big, sensitivity is high, in aerospace, bridge water
It is received significant attention in the key areas such as benefit, circumference security protection, biomedicine.FBG is a kind of space phase formed in fibre core
The grid class formation of periodic distribution, the essence of effect are exactly the filter or reflecting mirror that a narrowband is formed in fibre core.When
When extraneous strain variation, fiber grating is influenced by axial stress and relative displacement occurs, so that reflection wavelength generates drift.
When ambient temperature variation, the relative displacement that will affect between grid class formation of expanding with heat and contract with cold of fiber optic materials, so that reflection
Wavelength generates drift.Therefore, Yao Shixian temperature-strain two-parameter measurement needs two or more FBG sensors while sensing.
It is light however, how to change the limitation of traditional fiber FBG sensor single-point detection, extension test object range
The developing direction of fiber sensor.Ordinary optic fibre FBG sensor is cylindrical structure, can not refractive index directly to ambient enviroment it is special
Property is detected.Fiber core mismatch structure is prepared by arc discharge, there are light between the light that the light and covering that fibre core is propagated are propagated
Path difference and generate interference.With the increase of extraneous solution refractive index, the effective refractive index of cladding mode will increase, and core mode has
It is constant to imitate refractive index, former interference spectrum is caused to generate drift.The variation composed by fiber core mismatch constructive interference can be realized extraneous molten
The sensing of liquid refractive index.
Summary of the invention
The object of the present invention is to provide a kind of femtosecond lasers to prepare fiber core mismatch type FBG temperature strain refractometry side
Method can avoid electromagnetic interference, and high temperature resistant is, it can be achieved that temperature-strain-refractive index measures simultaneously.Meanwhile structure and manufacture craft
Simply, good reliability, high sensitivity.
For achieving the above object, the technical scheme is that
Femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method, which comprises the steps of:
1) the fiber core mismatched structures preparation based on arc discharge；
2) the FBG preparation based on femtosecond laser；
3) temperature refraction rate sensing testing system measures, and fibre optical sensor is placed in warm table surface, passes through fiber optical circulator and light
Source, optical fiber sensing analyzer are connected；Fibre optical sensor is placed in warm table surface, changes temperature height using it；Pass through rubber head
Dropper drips testing liquid in sensitive zones, carries out refractive index sensing measurement；
4) Strain refraction rate sensing testing system measures, and fibre optical sensor is placed in beam of uniform strength surface, by fiber optical circulator with
Light source, optical fiber sensing analyzer are connected；Change strain height using it, is dripped testing liquid in sensing unit by rubber head dropper
Domain carries out refractive index sensing measurement.
Preferably as one kind of the invention, two sections of SMF-28 single mode optical fiber end faces are removed coat, warp first by the first step
Single mode optical fiber is cut flat with after alcohol wipe, is placed in welding in heat sealing machine；Using fibre core alignment, by single mode optical fiber both ends fibre core
It is taken out after dislocation welding, after setting single-mode optical fiber length, removes single mode optical fiber end face coat again, and cut after alcohol wipe
It is flat, then be placed in heat sealing machine, dislocation welding, completes the preparation of fiber core mismatch structure again.
Preferably as one kind of the invention, second step, the single mode optical fiber fiber core mismatch structure for first preparing previous step
It is placed in three-dimensional mobile platform, guarantees to get a clear view；Femtosecond laser hot spot is focused on fibre core again, is existed using direct writing means
FBG sensor is prepared respectively on fiber core mismatch structure and non-mismatched structures.
Preferably as one kind of the invention, third step, light source uses wavelength band for the ASE light source of 1520-1610nm.
Preferably as one kind of the invention, third step, spectral analysis apparatus uses the spectroanalysis instrument of Yokogawa company,
Carry out the acquisition of transmitted spectrum.
Compared with prior art, the beneficial effects of the present invention are:
Using this method, which uses all -fiber formula structure, can avoid influence of the electromagnetic interference to testing result.The sensing
Device is mainly made of double FBG of the fiber core mismatch structure of arc discharge preparation and femtosecond laser preparation, it can be achieved that temperature-strain-
It is measured while refractive index.Refractive index sensing may be implemented using fiber core mismatch structure prepared by arc discharge, swashed using femtosecond
The FBG of light preparation can be resistant to high temperature, sensing strain, therefore the structure can extend parameter sensing, while realize that temperature-is answered
The measurement of change-refractive index.The sensor reliability is high, and when use need to will only be partially disposed in environment to be measured where sensor, separately
The real-time measuring multiple parameters of test macro can be completed in one end connection spectrometer.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
Fig. 1 is the arc discharge that femtosecond laser of the present invention prepares fiber core mismatch type FBG temperature strain refractive index measurement method
Fiber core mismatched structures prepare schematic diagram.
Fig. 2 is the transmitted light spectrogram of the fiber core mismatched structures of the embodiment of the present invention.
Fig. 3 is that the femtosecond laser FBG of the embodiment of the present invention prepares schematic diagram.
Fig. 4 is the sensor structure schematic diagram of the embodiment of the present invention.
Fig. 5 is the sensor transmitted spectrum schematic diagram of the embodiment of the present invention.
Fig. 6 is the temperature refraction rate sensing measurement schematic diagram of the embodiment of the present invention.
Fig. 7 is the Strain refraction rate sensing measurement schematic diagram of the embodiment of the present invention.
Fig. 8 is the temperature test spectral schematic of the embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.
As shown in figs. 1-7, a kind of femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method, including
Following steps: 1) the fiber core mismatched structures preparation based on arc discharge；Two sections of SMF-28 single mode optical fiber end faces are gone first
Except coat, single mode optical fiber is cut flat with after alcohol wipe, is placed in welding in heat sealing machine；Using fibre core alignment, by single mode
It is taken out after the fibre core dislocation welding of optical fiber both ends, after setting single-mode optical fiber length, removes single mode optical fiber end face coat again, and pass through
It cuts flat with, then is placed in heat sealing machine after alcohol wipe, again dislocation welding, complete the preparation of fiber core mismatch structure.
2) the FBG preparation based on femtosecond laser；Single mode optical fiber fiber core mismatch structure first by previous step preparation is placed
In in three-dimensional mobile platform, guaranteeing to get a clear view；1 hot spot of femtosecond laser is focused on fiber core with single-mold again, using direct writing means
FBG is prepared respectively in fiber core mismatch structure and non-mismatched structures.
3) temperature refraction rate sensing testing system measures, and fibre optical sensor is placed in 4 surface of warm table, passes through fiber optical circulator
It is connected with light source, optical fiber sensing analyzer；Fibre optical sensor is placed in warm table surface, changes temperature height using it；Pass through
Rubber head dropper 5 drips testing liquid in sensitive zones, carries out refractive index sensing test；Light source uses wavelength band for 1520-
The ASE light source 2 of 1610nm.The spectroanalysis instrument 3 that spectral analysis apparatus is produced using Yokogawa company, carries out transmitted spectrum
Acquisition.
4) Strain refraction rate sensing testing system measures, and fibre optical sensor is placed in beam of uniform strength surface, passes through optical fiber ring
Device is connected with light source, optical fiber sensing analyzer；Change strain height using it, is dripped testing liquid in biography by rubber head dropper
Sensillary area domain carries out refractive index sensing measurement.
As shown in figure 8, the transmitted spectrum in experiment.When ambient temperature changes, transmitted spectrum spectral line can drift about,
Recording certain characteristic peak corresponding wavelength value under different temperatures, strain or refractive index can be realized the high-acruracy survey of the parameter.
Fiber core mismatch structure is prepared using arc discharge, and respectively using winged in fiber core mismatch structure and non-mismatched structures
Second laser direct-writing prepares FBG, and two kinds of optical fiber structures are combined and are measured, cross jamming when measuring multiple parameters is avoided, and realizes
Temperature-strain-refractive index three-parameter measuring.
Embodiments described above is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
Claims (5)
1. femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method, which is characterized in that including walking as follows
It is rapid: 1) the fiber core mismatched structures preparation based on arc discharge；
2) the FBG preparation based on femtosecond laser；
3) temperature refraction rate sensing testing system measures, and fibre optical sensor is placed in warm table surface, passes through fiber optical circulator and light
Source, optical fiber sensing analyzer are connected；Fibre optical sensor is placed in warm table surface, changes temperature height using it；Pass through rubber head
Dropper drips testing liquid in sensitive zones, carries out refractive index sensing measurement；
4) Strain refraction rate sensing testing system measures, and fibre optical sensor is placed in beam of uniform strength surface, by fiber optical circulator with
Light source, optical fiber sensing analyzer are connected；Change strain height using it, is dripped testing liquid in sensing unit by rubber head dropper
Domain carries out refractive index sensing measurement.
2. femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method, feature according to claim 1
It is, the first step, firstly, two sections of SMF-28 single mode optical fiber end faces are removed coat, single mode optical fiber is cut flat with after alcohol wipe,
It is placed in welding in heat sealing machine；It using fibre core alignment, will be taken out after the fibre core dislocation welding of single mode optical fiber both ends, set single mode
After fiber lengths, single mode optical fiber end face coat is removed again, and cut flat with after alcohol wipe, then be placed in heat sealing machine, then
Secondary dislocation welding completes the preparation of fiber core mismatch structure.
3. femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method, feature according to claim 1
It is, second step, single mode optical fiber fiber core mismatch structure prepared by previous step is placed in three-dimensional mobile platform；Again by femtosecond
Laser facula focuses on fibre core, prepares FBG sensing respectively in fiber core mismatch structure and non-mismatched structures using direct writing means
Device.
4. femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method, feature according to claim 1
It is, third step, light source uses wavelength band for the ASE light source of 1520-1610nm.
5. femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method, feature according to claim 1
It is, third step, spectral analysis apparatus uses the spectroanalysis instrument of Yokogawa company, carries out the acquisition of transmitted spectrum.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710631A (en) * | 2020-12-02 | 2021-04-27 | 北京信息科技大学 | Temperature refractive index testing method based on femtosecond laser direct writing inclined fiber bragg grating |
| CN112762983A (en) * | 2020-12-07 | 2021-05-07 | 北京信息科技大学 | Double-parameter testing method for femtosecond laser direct writing LFPG combined with optical fiber MZI structure |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203893826U (en) * | 2014-02-26 | 2014-10-22 | 深圳大学 | Intensity-modulation fiber Michelson strain sensor and sensor device |
| CN204330589U (en) * | 2014-12-26 | 2015-05-13 | 中国计量学院 | A kind of intensity demodulation type optical fibre refractivity meter |
| CN205940607U (en) * | 2016-04-26 | 2017-02-08 | 哈尔滨理工大学 | Temperature and refracting index sensor based on multimode fiber intermode interference and FBG |
| CN206161192U (en) * | 2016-11-14 | 2017-05-10 | 湖北师范大学 | Interference type optical fiber temperature sensor based on capillary glass tube encapsulation |
| CN106767488A (en) * | 2016-11-02 | 2017-05-31 | 北京信息科技大学 | Temperature and strain testing method based on LPFG and thin-core fibers |
| CN108195485A (en) * | 2017-12-29 | 2018-06-22 | 北京信息科技大学 | Temperature and the biparameter sensor of strain and preparation method thereof are measured based on LPFG and MZ cascades |
| CN108225211A (en) * | 2017-12-27 | 2018-06-29 | 北京信息科技大学 | A kind of bionical feeler of multicore bragg grating |
| CN108226131A (en) * | 2017-12-28 | 2018-06-29 | 北京信息科技大学 | A kind of space panorama laser differential confocal Raman spectrum imaging detection method and device |
-
2019
- 2019-01-16 CN CN201910041909.4A patent/CN109682779A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203893826U (en) * | 2014-02-26 | 2014-10-22 | 深圳大学 | Intensity-modulation fiber Michelson strain sensor and sensor device |
| CN204330589U (en) * | 2014-12-26 | 2015-05-13 | 中国计量学院 | A kind of intensity demodulation type optical fibre refractivity meter |
| CN205940607U (en) * | 2016-04-26 | 2017-02-08 | 哈尔滨理工大学 | Temperature and refracting index sensor based on multimode fiber intermode interference and FBG |
| CN106767488A (en) * | 2016-11-02 | 2017-05-31 | 北京信息科技大学 | Temperature and strain testing method based on LPFG and thin-core fibers |
| CN206161192U (en) * | 2016-11-14 | 2017-05-10 | 湖北师范大学 | Interference type optical fiber temperature sensor based on capillary glass tube encapsulation |
| CN108225211A (en) * | 2017-12-27 | 2018-06-29 | 北京信息科技大学 | A kind of bionical feeler of multicore bragg grating |
| CN108226131A (en) * | 2017-12-28 | 2018-06-29 | 北京信息科技大学 | A kind of space panorama laser differential confocal Raman spectrum imaging detection method and device |
| CN108195485A (en) * | 2017-12-29 | 2018-06-22 | 北京信息科技大学 | Temperature and the biparameter sensor of strain and preparation method thereof are measured based on LPFG and MZ cascades |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710631A (en) * | 2020-12-02 | 2021-04-27 | 北京信息科技大学 | Temperature refractive index testing method based on femtosecond laser direct writing inclined fiber bragg grating |
| CN112762983A (en) * | 2020-12-07 | 2021-05-07 | 北京信息科技大学 | Double-parameter testing method for femtosecond laser direct writing LFPG combined with optical fiber MZI structure |
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Application publication date: 20190426 |