CN109682778A - Femtosecond laser prepares fiber core mismatch type FBG temperature refraction rate measurement method - Google Patents
Femtosecond laser prepares fiber core mismatch type FBG temperature refraction rate measurement method Download PDFInfo
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- CN109682778A CN109682778A CN201910039413.3A CN201910039413A CN109682778A CN 109682778 A CN109682778 A CN 109682778A CN 201910039413 A CN201910039413 A CN 201910039413A CN 109682778 A CN109682778 A CN 109682778A
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- fiber core
- femtosecond laser
- refraction rate
- fiber
- measurement method
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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
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- 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
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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
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- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- Immunology (AREA)
- Pathology (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The present invention discloses femtosecond laser and prepares fiber core mismatch type FBG temperature refraction rate 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；Change temperature height using warm table, testing liquid is dripped in sensitive zones by rubber head dropper, carries out refractive index sensing measurement.Can avoid electromagnetic interference, high temperature resistant, it can be achieved that temperature refraction rate while measure.Its structure and manufacture craft are simple, good reliability, high sensitivity.
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
Refractive index measurement method.
Background technique
Fibre optical sensor has very extensive application value, has many good characteristics, 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 ambient temperature changes, the relative displacement that will affect between grid class formation of expanding with heat and contract with cold of fiber optic materials, so that back wave
It is long to generate drift.By demodulating the range of wave length shift, the variation of ambient temperature can be intuitively calculated.
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 refraction rate measurement method, this
Method prepares fiber core mismatch structure by arc discharge, and prepares FBG using femtosecond laser direct write in fiber core mismatch structure.It can
Electromagnetic interference is avoided, high temperature resistant is, it can be achieved that temperature-refractive index measures simultaneously.Meanwhile structure and manufacture craft are simple, reliably
The good, high sensitivity of property.
For achieving the above object, the technical scheme is that
Femtosecond laser prepares fiber core mismatch type FBG temperature refraction rate measurement method, which comprises the steps of: 1) base
It is prepared in the fiber core mismatched structures of 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, by fiber optical circulator with
Light source, optical fiber sensing analyzer are connected；Change temperature height using warm table, is dripped testing liquid in biography by rubber head dropper
Sensillary area 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；Femtosecond laser hot spot is focused on fibre core again, using direct writing means in fiber core mismatch region
On prepare FBG sensor.
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:
Fiber core mismatch type FBG temperature refraction rate measurement method is prepared using femtosecond laser, using all -fiber formula structure, can avoid electricity
Influence of the magnetic disturbance to testing result.The sensor is mainly prepared by the fiber core mismatch structure and femtosecond laser of arc discharge preparation
Double FBG composition.Refractive index sensing may be implemented using fiber core mismatch structure prepared by arc discharge, prepared using femtosecond laser
FBG can be resistant to high temperature, sensing strain, therefore the structure can extend parameter sensing, while realize temperature and refractive index
Measurement.The sensor reliability is high, and when use need to will only be partially disposed in environment to be measured where sensor, and the other end connects spectrum
The real-time measuring multiple parameters of test macro can be completed in instrument.
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 light for the arc discharge that femtosecond laser of the present invention prepares fiber core mismatch type FBG temperature refraction rate measurement method
Long and slender 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 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 figures 1 to 6, femtosecond laser prepares fiber core mismatch type FBG temperature refraction rate measurement method, includes the 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 removed into coat first, single mode optical fiber is cut flat with after alcohol wipe, is placed in molten
Pick interior welding；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 optical fiber length
Afterwards, single mode optical fiber end face coat is removed again, and is cut flat with after alcohol wipe, then be placed in heat sealing machine, and dislocation is molten again
It connects, completes 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；1 hot spot of femtosecond laser is focused on fibre core again, is made on fiber core mismatch region using direct writing means
Standby FBG sensor.
3) temperature refraction rate sensing testing system measures, and fibre optical sensor is placed in 4 surface of warm table, passes through optical fiber ring
Device is connected with light source, optical fiber sensing analyzer；Change temperature height using warm table；By rubber head dropper 5 by testing liquid
It drips in sensitive zones, carries out refractive index sensing measurement.
Light source uses wavelength band for the ASE light source 2 of 1520-1610nm.Spectral analysis apparatus uses Yokogawa company
Spectroanalysis instrument 3, carry out the acquisition of transmitted spectrum.
As shown in fig. 7, the reflectance spectrum in experiment.When ambient temperature changes, reflectance spectrum spectral line can drift about,
Recording certain characteristic peak corresponding wavelength value under different temperatures or refractive index can be realized the high-acruracy survey two-parameter to this.
Fiber core mismatch structure is prepared using arc discharge, and is prepared on fiber core mismatch region using femtosecond laser direct write
Two kinds of optical fiber structures are combined and are measured by FBG, avoid cross jamming when measuring multiple parameters, realize temperature and refractive index
Two parameter measurements.
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 refraction rate measurement method, which comprises the steps of: 1)
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, by fiber optical circulator with
Light source, optical fiber sensing analyzer are connected；Change temperature height using warm table, is dripped testing liquid in biography by rubber head dropper
Sensillary area domain carries out refractive index sensing measurement.
2. femtosecond laser prepares fiber core mismatch type FBG temperature refraction rate measurement method according to claim 1, feature exists
In two sections of SMF-28 single mode optical fiber end faces are removed coat first, single mode optical fiber is cut flat with after alcohol wipe, is put by the first step
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 optics
After fine length, single mode optical fiber end face coat is removed again, and cut flat with after alcohol wipe, then be placed in heat sealing machine, again
Dislocation welding completes the preparation of fiber core mismatch structure.
3. femtosecond laser prepares fiber core mismatch type FBG temperature refraction rate measurement method according to claim 1, feature exists
In single mode optical fiber fiber core mismatch structure prepared by previous step is placed in three-dimensional mobile platform by second step first；It will fly again
Second laser facula focuses on fibre core, prepares FBG sensor on fiber core mismatch region using direct writing means.
4. femtosecond laser prepares fiber core mismatch type FBG temperature refraction rate measurement method according to claim 1, feature exists
In 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 refraction rate measurement method according to claim 1, feature exists
In 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118614A (en) * | 2019-05-29 | 2019-08-13 | 电子科技大学 | The sapphire fiber grating sensor and its temperature checking method of anti-extreme environment |
| CN112729599A (en) * | 2020-12-07 | 2021-04-30 | 北京信息科技大学 | Temperature sensing test method for femtosecond laser direct writing composite fiber bragg grating |
| CN112729600A (en) * | 2020-12-07 | 2021-04-30 | 北京信息科技大学 | Temperature and air pressure testing method for FBG (fiber Bragg Grating) combined with optical fiber microspheres by femtosecond laser direct writing |
| 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 (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944286A (en) * | 2012-11-14 | 2013-02-27 | 北京信息科技大学 | Liquid level detecting circuit and detecting method |
| CN103033945A (en) * | 2012-12-21 | 2013-04-10 | 北京信息科技大学 | Polarization convertor, vector light beam generating system and vector light beam generating method |
| 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 |
| CN108195482A (en) * | 2017-12-25 | 2018-06-22 | 北京信息科技大学 | Based on the cascade temperature of FBG and MZI and the two-parameter fibre optical sensor of alcoholic solution concentration |
| 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 |
-
2019
- 2019-01-16 CN CN201910039413.3A patent/CN109682778A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944286A (en) * | 2012-11-14 | 2013-02-27 | 北京信息科技大学 | Liquid level detecting circuit and detecting method |
| CN103033945A (en) * | 2012-12-21 | 2013-04-10 | 北京信息科技大学 | Polarization convertor, vector light beam generating system and vector light beam generating method |
| 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 |
| CN108195482A (en) * | 2017-12-25 | 2018-06-22 | 北京信息科技大学 | Based on the cascade temperature of FBG and MZI and the two-parameter fibre optical sensor of alcoholic solution concentration |
| 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118614A (en) * | 2019-05-29 | 2019-08-13 | 电子科技大学 | The sapphire fiber grating sensor and its temperature checking method of anti-extreme environment |
| CN112729599A (en) * | 2020-12-07 | 2021-04-30 | 北京信息科技大学 | Temperature sensing test method for femtosecond laser direct writing composite fiber bragg grating |
| CN112729600A (en) * | 2020-12-07 | 2021-04-30 | 北京信息科技大学 | Temperature and air pressure testing method for FBG (fiber Bragg Grating) combined with optical fiber microspheres by femtosecond laser direct writing |
| 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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