CN109632713A - Femtosecond laser prepares fiber core mismatch type FP Strain refraction rate measurement method - Google Patents
Femtosecond laser prepares fiber core mismatch type FP Strain refraction rate measurement method Download PDFInfo
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- CN109632713A CN109632713A CN201910039242.4A CN201910039242A CN109632713A CN 109632713 A CN109632713 A CN 109632713A CN 201910039242 A CN201910039242 A CN 201910039242A CN 109632713 A CN109632713 A CN 109632713A
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- Prior art keywords
- strain
- femtosecond laser
- fiber core
- fiber
- refraction rate
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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
- 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 invention belongs to fiber optic sensing device field, open femtosecond laser prepares fiber core mismatch type FP Strain refraction rate measurement method, which comprises the steps of: 1) the fiber core mismatched structures preparation based on arc discharge；2) the FP preparation based on femtosecond laser；3) Strain 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 beam of uniform strength surface, changes strain height using it, is dripped testing liquid 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 strain and refractive index measure simultaneously.Meanwhile 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 FP strain folding
Penetrate rate measurement method.
Background technique
Fibre optical sensor is with many good characteristics, it can be achieved that the measurement work under complex environment has very extensive answer
With value.It has the characteristics that electromagnetism interference, anti-radiation, high sensitivity, light-weight, insulation explosion-proof, corrosion-resistant, and fiber optic ruler
It is very little small, there is good optical transmission performance.It is common sensor in optical fibre Fabry-perot (Fabry-Perot, FP)
Part has the advantages such as structure is simple, small in size, dynamic range is big, sensitivity is high, in aerospace, bridge water conservancy, circumference peace
It is received significant attention in the key areas such as anti-, biomedicine.The characteristics of optical fiber FP, is using simple optical fiber, utilizes beam interference
It is measured to detect, avoid the problem that double joint optical fiber matches.It is anti-that two beams are generated respectively after the light in optical fiber encounters two reflecting mirrors
Light is penetrated, this two beams reflected light generates interference after meeting.When extraneous strain variation, optical fiber FP chamber personal attendant's strain variation, two reflections
The phase difference of light changes, so that reflection wavelength generates drift.By demodulating the range of wave length shift, the external world can be calculated
The variation of strain.
It is optical fiber however, how to change the limitation of traditional fiber FP sensor single-point detection, extension test object range
The developing direction of sensor.Ordinary optic fibre FP sensor is cylindrical structure, can not be directly to the refractive index characteristic of ambient enviroment
It is detected.Fiber core mismatch structure is prepared by arc discharge, there are light paths between the light that the light and covering that fibre core is propagated are propagated
Difference and generate interference.With the increase of extraneous solution refractive index, the effective refractive index of cladding mode will increase, and core mode is effective
Refractive index is constant, and former interference spectrum is caused to generate drift.Extraneous solution can be realized in the variation composed by fiber core mismatch constructive interference
The sensing of refractive index.Fiber core mismatch structure is prepared using arc discharge, and uses femtosecond laser direct write in fiber core mismatch structure
FP is prepared, two kinds of optical fiber structures are combined and are measured, avoids cross jamming when measuring multiple parameters, realizes strain and refractive index
Two-parameter measurement.
Summary of the invention
The present invention is directed to the defect of the customer service prior art, a kind of femtosecond laser is provided and prepares fiber core mismatch type FP Strain refraction
Rate measurement method, this method prepare fiber core mismatch structure by arc discharge, and femtosecond laser is used in fiber core mismatch structure
Direct write prepares FP.It can avoid electromagnetic interference, high temperature resistant measures while, it can be achieved that straining with refractive index.Meanwhile structure and system
Make simple process, good reliability, high sensitivity.
For achieving the above object, the technical scheme is that
Femtosecond laser prepares fiber core mismatch type FP Strain refraction rate measurement method, which comprises the steps of: 1) is based on
It is prepared by the fiber core mismatched structures of arc discharge；
2) the FP preparation based on femtosecond laser；
3) Strain 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 beam of uniform strength surface, changes strain height using it, passes through
Rubber head dropper drips testing liquid in sensitive zones, carries out refractive index sensing measurement.
Preferably as one kind of the invention, the first step, firstly, two sections of SMF-28 single mode optical fiber end faces are removed into 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 optical fiber both ends fibre
It is taken out after core dislocation welding, after setting single-mode optical fiber length, removes single mode optical fiber end face coat again, and after alcohol wipe
It cuts flat with, then is placed in heat sealing machine, again dislocation welding, complete the preparation of fiber core with single-mold mismatched structures.
Preferably as one kind of the invention, second step places the single mode optical fiber fiber core mismatch structure of previous step preparation
In in three-dimensional mobile platform；Femtosecond laser hot spot is focused on fibre core again, is made on fiber core mismatch region using direct writing means
Standby FP 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:
The present invention uses all -fiber formula structure, can avoid influence of the electromagnetic interference to testing result.The sensor is mainly by electric arc
The fiber core mismatch structure of electric discharge preparation and the FP composition of femtosecond laser preparation measure while, it can be achieved that straining with refractive index.Make
Refractive index sensing may be implemented with fiber core mismatch structure prepared by arc discharge, height can be resistant to using FP prepared by femtosecond laser
Temperature, therefore the structure can extend parameter sensing, while realize strain and the measurement of refractive index.The sensor reliability is high, makes
Used time need to will only be partially disposed in environment to be measured where sensor, and the real-time of test macro can be completed in other end connection spectrometer
Two-parameter measurement.
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 optical fiber for the arc discharge that femtosecond laser of the present invention prepares fiber core mismatch type FP Strain refraction rate measurement method
Fiber core mismatch structure prepares 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 FP 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 Strain refraction rate sensing measurement schematic diagram of the embodiment of the present invention.
Fig. 7 is the strain testing 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 FP Strain refraction rate measurement method, includes the following steps:
1) the fiber core mismatched structures preparation based on arc discharge；Firstly, two sections of SMF-28 single mode optical fiber end faces are removed into 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 optical fiber both ends fibre
It is taken out after core dislocation welding, after setting single-mode optical fiber length, removes single mode optical fiber end face coat again, and after alcohol wipe
It cuts flat with, then is placed in heat sealing machine, again dislocation welding, complete the preparation of fiber core mismatch structure.
2) the FP preparation based on femtosecond laser；Single mode optical fiber fiber core mismatch structure prepared by previous step is placed in three-dimensional
On mobile platform；1 hot spot of femtosecond laser is focused on fibre core again, prepares FP biography on fiber core mismatch region using direct writing means
Sensor.
3) Strain refraction rate sensing testing system measures, and fibre optical sensor is placed in warm table surface, passes through fiber optical circulator
It is connected with light source, optical fiber sensing analyzer；Light source uses wavelength band for the ASE light source 2 of 1520-1610nm, spectrum analysis
Equipment uses the spectroanalysis instrument 3 of Yokogawa company, carries out the acquisition of transmitted spectrum.Fibre optical sensor is placed in the beam of uniform strength 4
Surface changes strain height using it, is dripped testing liquid in sensitive zones by rubber head dropper 5, carries out refractive index sensing survey
Amount.
As shown in fig. 7, the transmitted spectrum in experiment.When the external world, strain changes, and transmitted spectrum spectral line can drift about,
Recording certain characteristic peak corresponding wavelength value under differently strained 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 in fiber core mismatch structure using femtosecond laser direct write
Two kinds of optical fiber structures are combined and are measured by FP, avoid cross jamming when measuring multiple parameters, realize two ginsengs of Strain refraction rate
Number measurement.
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 FP Strain 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 FP preparation based on femtosecond laser；
3) Strain 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 beam of uniform strength surface, changes strain height using it, passes through glue
Head dropper drips testing liquid in sensitive zones, carries out refractive index sensing measurement.
2. femtosecond laser prepares fiber core mismatch type FP Strain refraction rate measurement method according to claim 1, which is characterized in that
The first step cuts flat with single mode optical fiber firstly, two sections of SMF-28 single mode optical fiber end faces are removed coat after alcohol wipe, places
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 optical fiber
After 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, it is wrong again
The preparation of fiber core mismatch structure is completed in position welding.
3. femtosecond laser prepares fiber core mismatch type FP Strain refraction rate measurement method according to claim 1, which is characterized in that
Single mode optical fiber fiber core mismatch structure prepared by previous step is placed in three-dimensional mobile platform by second step；Again by femtosecond laser
Hot spot focuses on fibre core, and FP sensor is prepared on fiber core mismatch region using direct writing means.
4. femtosecond laser prepares fiber core mismatch type FP Strain refraction rate measurement method according to claim 1, which is characterized in that
Third step, light source use wavelength band for the ASE light source of 1520-1610nm.
5. femtosecond laser prepares fiber core mismatch type FP Strain refraction rate measurement method according to claim 1, which is characterized in that
Third step, spectral analysis apparatus use the spectroanalysis instrument of Yokogawa company, carry out the acquisition of transmitted spectrum.
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Cited By (1)
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| CN110319786A (en) * | 2019-07-30 | 2019-10-11 | 南京信息工程大学 | A kind of strain sensing Fabry-Perot interferometer and the strain sensing method based on the interferometer |
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Application publication date: 20190416 |