CN108152880A - A kind of production method for the long-period fiber grating for being used for temperature and strain measurement - Google Patents
A kind of production method for the long-period fiber grating for being used for temperature and strain measurement Download PDFInfo
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- CN108152880A CN108152880A CN201711430681.5A CN201711430681A CN108152880A CN 108152880 A CN108152880 A CN 108152880A CN 201711430681 A CN201711430681 A CN 201711430681A CN 108152880 A CN108152880 A CN 108152880A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02152—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating involving moving the fibre or a manufacturing element, stretching of the fibre
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Abstract
The present invention provides a kind of production method for temperature and the long-period fiber grating of strain measurement and includes：Long-period fiber grating platform for making is built, fiber clamp is fixed on high-precision three-dimensional motion platform, 1060 optical fiber of HI for removing removing coating is fixed on fiber clamp；High reflective mirror is arranged right over fiber clamp；Femtosecond laser sequentially passes through the half-wave plate, polarizer, attenuator and window, 1060 optical fiber of HI on the fiber clamp is focused to by 45 times of microcobjective after stating high reflective mirror reflection, it crosses and inscribes to 1060 optical fiber of HI, screen periods are obtained as 200um, point-by-point scribing line spacing is 20um, it is 100um that length is inscribed in monocycle, and duty ratio is 0.5 long-period fiber grating；Arrange charge coupling device right over the high reflective mirror, the focal position and laser of the charge-coupled device observation laser are to the processing pattern of 1060 optical fiber of HI on the fixture.The long-period fiber grating that the present invention makes is realized while measures temperature and strain, and ensure that the precision of measurement.
Description
Technical field
It is more particularly to a kind of for temperature and the long period light of strain measurement the present invention relates to fiber optic sensor technology field
The production method of fine grating.
Background technology
In recent years, it is received significant attention in optic communication and sensory field of optic fibre long-period fiber grating (LPFG).Tradition
The fibre optical sensor mostly measurement based on light intensity, cause stability not high, and LPFG is using Wavelength-encoding mode, not by light intensity
It influences, stability greatly improves.In addition, LPFG periods compared with bragg grating are longer, up to tens or even hundreds of
Micron, in transmission process can by the energy coupling in fibre core basic mode to each cladding mode, therefore LPFG to external environment such as
Temperature, strain, refractive index etc. have higher sensitivity.And in the prior art, intersect sensing to solve the problems, such as, it is most of to be all
LPFG is combined to form sensor with other optical grating constructions, these methods increase sensor while sensing arrangement is complicated
Volume.
Therefore, to solve the above-mentioned problems, need a kind of for temperature and the system of the long-period fiber grating of strain measurement
Make method.
Invention content
The purpose of the present invention is to provide a kind of production method of the long-period fiber grating for temperature and strain measurement,
The method includes：
Long-period fiber grating platform for making is built, the platform for making includes 800nm femto-second lasers, high-precision three-dimensional
Motion platform, focusing objective len and high reflective mirror；
Fiber clamp is fixed on the high-precision three-dimensional motion platform, the HI-1060 optical fiber for removing removing coating is fixed on
On the fiber clamp；
The high reflective mirror is arranged right over the fiber clamp, the 800nm is sequentially arranged in the high reflective mirror front end
Femto-second laser, half-wave plate, polarizer, attenuator and the window passed through for laser, the 800nm femto-second lasers are to cross
Mode emit femtosecond laser, the femtosecond laser sequentially passes through the half-wave plate, polarizer, attenuator and window, through described
The HI-1060 optical fiber on the fiber clamp is focused to by 45 times of microcobjective after high reflective mirror reflection, to the HI-1060 light
Fibre scribing line is inscribed, and obtains screen periods as 200um, and point-by-point spacing of crossing is 20um, and it is 100um that length is inscribed in the monocycle, is accounted for
Sky is than the long-period fiber grating for 0.5；
Arrange charge coupling device right over the high reflective mirror, the focal position of the charge-coupled device observation laser and
Laser is to the processing pattern of HI-1060 optical fiber on the fixture.
Preferably, the HI-1060 optical fiber is between testing broad-band light source and test spectral analyzer, the HI-
1060 optical fiber one end connect the testing broad-band light source, and the other end connects the test spectral analyzer, the test spectral point
Analyzer observes the transmitted spectrum of the testing laser of the testing broad-band light source transmitting in real time.
Preferably, the wave-length coverage of the testing laser of the testing broad-band light source transmitting is 1530nm~1610nm.
Preferably, the operating wavelength range of the test spectral analyzer be 1200nm~2400nm, minimum resolving accuracy
For 0.05nm.
Preferably, in the HI-1060 optical fiber scribing process, control the high-precision three-dimensional motion platform movement and
Closure/unlatching of the window, makes the long-period fiber grating.
Preferably, the core diameter of the HI-1060 optical fiber is 6.2um, cladding diameter 125um.
Preferably, the amplification factor of the microcobjective is 45 times, numerical aperture 0.75.
Preferably, LED illumination device is installed respectively above and below the fiber clamp.
Preferably, the femtosecond laser process velocity of the 800nm femto-second lasers transmitting is 10um/s, power 50uw.
A kind of production method for temperature and the long-period fiber grating of strain measurement provided by the invention can be effective
Simplify the structure of sensor, reduce the volume of sensor, while the long-period fiber grating made can be realized to temperature and be answered
The high-acruracy survey of change.
It should be appreciated that aforementioned description substantially and follow-up description in detail are exemplary illustration and explanation, it should not
As the limitation to the claimed content of the present invention.
Description of the drawings
With reference to the attached drawing of accompanying, the more purposes of the present invention, function and advantage will pass through the as follows of embodiment of the present invention
Description is illustrated, wherein：
Fig. 1 diagrammatically illustrates the schematic diagram that the present invention makes long-period fiber grating；
Fig. 2 shows the microstructure schematic diagrames of the long-period fiber grating of the invention made；
Fig. 3 shows the transmitted spectrum schematic diagram of long-period fiber grating that the present invention makes；
Fig. 4 shows that the long-period fiber grating of use production of the present invention measures the schematic diagram of temperature and strain simultaneously.
Specific embodiment
By reference to exemplary embodiment, the purpose of the present invention and function and the side for being used to implement these purposes and function
Method will be illustrated.However, the present invention is not limited to exemplary embodiment as disclosed below；Can by different form come
It is realized.The essence of specification is only to aid in the detail of the various equivalent modifications Integrated Understanding present invention.
Hereinafter, the embodiment of the present invention will be described with reference to the drawings, relevant technical terms should be people in the art
Known to member.In the accompanying drawings, identical reference numeral represents same or similar component or same or like step,
Unless otherwise indicated.Present disclosure is illustrated below by specific embodiment, the present invention makes length as shown in Figure 1
The schematic diagram of period optical fiber grating, it is according to an embodiment of the invention, a kind of for temperature and the long period of strain two-parameter measurement
The production method of fiber grating, including：Long-period fiber grating platform for making is built, platform for making includes 800nm femtosecond lasers
105 devices, high-precision three-dimensional motion platform 101, focusing objective len 103 and high reflective mirror 104.
Fiber clamp (not shown) is fixed on high-precision three-dimensional motion platform 101, the HI-1060 of removing coating will be removed
Optical fiber 102 is fixed on fiber clamp.
Right over fiber clamp arrange high reflective mirror 104, be sequentially arranged in high reflective mirror front end 800nm femto-second lasers 105,
Half-wave plate 106, polarizer 107, attenuator 108 and the window 109 passed through for laser, 800nm femto-second lasers 105 are with scribing line
Mode emit femtosecond laser, femtosecond laser sequentially passes through half-wave plate 106, polarizer 107, attenuator 108 and window 109, warp
High reflective mirror 104 is focused to the HI-1060 optical fiber 102 on fiber clamp by 45 times of microcobjective 103 after reflecting, to HI-1060
The scribing line of optical fiber 102 is inscribed.In HI-1060 optical fiber scribing process, the movement of control high-precision three-dimensional motion platform 101 and window
109 closure/unlatching makes long-period fiber grating, obtains screen periods as 200um, and point-by-point spacing of crossing is 20um, single-revolution
It is 100um that length is inscribed in phase, and duty ratio is 0.5 long-period fiber grating.Preferably, the HI-1060 used in embodiment
The core diameter of optical fiber 102 is 6.2um, cladding diameter 125um.
The arrangement charge coupling device 110 right over high reflective mirror 104, charge-coupled device 110 observe the focal position of laser
With laser to the processing pattern of HI-1060 optical fiber 102 on fixture.LED illumination is installed respectively above and below fiber clamp
Equipment, to ensure that charge coupling device accurately observes focal position and light of the femtosecond laser hot spot in HI-1060 optical fiber 102
Fine processing pattern.
According to an embodiment of the invention, preferably 800nm femto-second lasers 105 select laser center wavelength 800nm, arteries and veins
Rush the titanium sapphire femto-second laser of width 35fs, repetition rate 1kHz.The femtosecond laser that 800nm femto-second lasers 105 emit
Process velocity is 10um/s, power 50uw.
According to an embodiment of the invention, HI-1060 optical fiber 102 is between testing broad-band light source 111 and test spectral analyzer
Between 112,102 one end connecting test wideband light source 111 of HI-1060 optical fiber, other end connecting test spectroanalysis instrument 112 is surveyed
Examination spectroanalysis instrument observes the transmitted spectrum of the testing laser of testing broad-band light source transmitting in real time.
It should be appreciated that during above-mentioned making long-period fiber grating, testing broad-band light source 111 emits testing laser,
Test spectral analyzer 112 observes the transmitted spectrum of testing laser in real time, while controls the shifting of high-precision three-dimensional motion platform 101
Dynamic and window 109 closure/unlatching, makes long-period fiber grating.According to an embodiment of the invention, testing broad-band light source 111
The wave-length coverage of the testing laser of transmitting is 1530nm~1610nm.The operating wavelength range of test spectral analyzer is 1200nm
~2400nm, minimum resolving accuracy are 0.05nm.The amplification factor of microcobjective is 45 times, numerical aperture 0.75.
The microstructure schematic diagram of long-period fiber grating that the present invention as shown in Figure 2 makes, it is of the invention as shown in Figure 3 to make
The transmitted spectrum schematic diagram of the long-period fiber grating of work, the long-period fiber grating as can be seen from the figure made in embodiment
In wavelength in the range of 1520nm~1610nm, to occur two loss peaks in transmitted spectrum, the resonance wavelength of loss peak is respectively
1539.15nm and 1571.98nm.
Below to using the long-period fiber grating temperature that the method for the present invention makes and straining while measure theoretical point of progress
Analysis.
The fibre core basic mode of fl transmission is coupled in each order cladding mode of symport by LPFG, can by coupled mode theory
Knowing the phase-matching condition of LPFG is：
In formula, λmFor resonance wavelength, Λ is the period of LPFG,WithRespectively m covering of fibre core basic mode and single order
The effective refractive index of mould.Above formula distinguishes temperature T and stress ε derivations, can obtain the temperature and strain sensitivity of centre wavelength：
In formula, ξco、ξclThe respectively thermo-optical coeffecient of fibre core and covering, α are coefficient of thermal expansion；ρco、ρclRespectively fibre core and
The elasto-optical coefficient of covering, k are the stress coefficient of optical fiber.
Assuming that temperature causes the drift of LPFG resonance wavelengths to be independent from each other with strain, therefore when temperature and strain are made simultaneously
During for LPFG, the drift that the resonance wavelength of two loss peaks occurs is represented by：
Therefore temperature can be obtained and the variable quantity of strain is：
Therefore can be by observing in transmitted spectrum the resonance wavelength variable quantities of different loss peaks, combination temperature, strain are rung
Sensitivity and sensitivity coefficient matrix are answered, is realized to being measured while temperature and strain.
The long-period fiber grating made in embodiment using the method for offer of the present invention is into trip temperature and strain
It measures simultaneously, the long-period fiber grating of use production of the present invention as shown in Figure 4 measures the schematic diagram of temperature and strain simultaneously, surveys
Amount process carries out as follows：
Test system building, test system include wideband light source 402, circulator 404, long-period fiber grating sensor
201st, heating platform 401, mobile stretching platform and spectroanalysis instrument 403.
Long-period fiber grating 201 is fixed on heating platform 401, while the mobile platform that stretches fixes long period optical fiber
The both ends of grating sensor 201.Change the temperature of heating platform, while move left and right the mobile stretching platform.Measurement process
In, accurate temperature value is 0.1 DEG C.
The transmitted spectrum of long-period fiber grating 201 is observed and recorded in real time to spectroanalysis instrument 403, according to resonance wavelength
Drift value calculates the temperature and gage factor of long-period fiber grating difference loss peak, can according to sensitivity coefficient matrix
To obtain current temperature and dependent variable.
In embodiment, a length of 80 μm of the fibre-optical F-P sensor chamber of making, the range of temperature of heating platform for 30 DEG C-
150 DEG C, 30 DEG C are divided between temperature sampling, utilizes the transmitted light of spectroanalysis instrument record long-period fiber grating at different temperatures
Spectrum.
The femto-second laser that the present invention is 800nm using centre wavelength fabrication cycle in multimode fibre is the double of 200um
Peak long-period fiber grating has higher sensitivity to temperature and strain, is changed by the wave length shift of different loss peaks
Amount realizes that temperature two-parameter measures simultaneously with strain with reference to sensitivity matrix.
A kind of production method for temperature and the long-period fiber grating of strain measurement provided by the invention can be effective
Simplify the structure of sensor, reduce the volume of sensor, while the long-period fiber grating made can be realized to temperature and be answered
The high-acruracy survey of change.
Explanation and practice with reference to the present invention disclosed here, the other embodiment of the present invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is regarded only as being exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (9)
- It is 1. a kind of for temperature and the production method of the long-period fiber grating of strain measurement, which is characterized in that the method packet It includes：Long-period fiber grating platform for making is built, the platform for making includes 800nm femto-second lasers, high-precision three-dimensional moves Platform, focusing objective len and high reflective mirror；Fiber clamp is fixed on the high-precision three-dimensional motion platform, the HI-1060 optical fiber for removing removing coating is fixed on described On fiber clamp；The high reflective mirror is arranged right over the fiber clamp, the 800nm femtoseconds are sequentially arranged in the high reflective mirror front end Laser, half-wave plate, polarizer, attenuator and the window passed through for laser, side of the 800nm femto-second lasers to cross Formula emits femtosecond laser, and the femtosecond laser sequentially passes through the half-wave plate, polarizer, attenuator and window, through described high anti- The HI-1060 optical fiber on the fiber clamp is focused to by 45 times of microcobjective after mirror reflection, the HI-1060 optical fiber is drawn Line is inscribed, and obtains screen periods as 200um, and spacing of crossing point by point is 20um, length is inscribed in the monocycle as 100um, duty ratio For 0.5 long-period fiber grating；Charge coupling device, the focal position and laser of the charge-coupled device observation laser are arranged right over the high reflective mirror To the processing pattern of HI-1060 optical fiber on the fixture.
- 2. according to the method described in claim 1, it is characterized in that, the HI-1060 optical fiber is between testing broad-band light source and survey Between trying spectroanalysis instrument, described HI-1060 optical fiber one end connects the testing broad-band light source, and the other end connects the test light Spectrum analysis instrument, the test spectral analyzer observe the transmitted spectrum of the testing laser of the testing broad-band light source transmitting in real time.
- 3. the according to the method described in claim 2, it is characterized in that, wavelength of the testing laser of testing broad-band light source transmitting Ranging from 1530nm~1610nm.
- 4. according to the method described in claim 2, it is characterized in that, the operating wavelength range of the test spectral analyzer is 1200nm~2400nm, minimum resolving accuracy are 0.05nm.
- 5. according to the method described in claim 1, it is characterized in that, in the HI-1060 optical fiber scribing process, described in control The movement of high-precision three-dimensional motion platform and closure/unlatching of the window, make the long-period fiber grating.
- 6. according to the method described in claim 1, it is characterized in that, the core diameter of the HI-1060 optical fiber be 6.2um, packet The a diameter of 125um of layer.
- 7. according to the method described in claim 1, it is characterized in that, the amplification factor of the microcobjective be 45 times, numerical aperture Diameter is 0.75.
- 8. it according to the method described in claim 1, it is characterized in that, is installed respectively above and below the fiber clamp LED illumination device.
- 9. according to the method described in claim 1, it is characterized in that, the femtosecond laser of 800nm femto-second lasers transmitting adds Work speed is 10um/s, power 50uw.
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| CN201711430681.5A CN108152880A (en) | 2017-12-26 | 2017-12-26 | A kind of production method for the long-period fiber grating for being used for temperature and strain measurement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112558215A (en) * | 2020-12-07 | 2021-03-26 | 北京信息科技大学 | Step type equal-grid-pitch grating based on femtosecond laser technology and preparation method thereof |
| CN112730331A (en) * | 2020-12-04 | 2021-04-30 | 北京信息科技大学 | Femtosecond laser direct-writing photonic chip diffraction grating detection method |
| CN113029333A (en) * | 2021-03-29 | 2021-06-25 | 中南大学 | Laser power detection device and measurement method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101266319A (en) * | 2008-04-21 | 2008-09-17 | 山东大学 | Long period optical fibre grating ultraviolet laser point-to-point writing method |
| CN104698531A (en) * | 2015-02-10 | 2015-06-10 | 山东交通学院 | Device and method for preparing long-periodic fiber bragg grating by femtosecond laser Talbot effect |
| CN106526741A (en) * | 2016-12-27 | 2017-03-22 | 南京理工大学 | Device for manufacturing spiral core long-period fiber grating |
| CN106707406A (en) * | 2016-11-02 | 2017-05-24 | 北京信息科技大学 | System for producing long-cycle optical fiber grating based on femtosecond laser direct writing method |
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2017
- 2017-12-26 CN CN201711430681.5A patent/CN108152880A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101266319A (en) * | 2008-04-21 | 2008-09-17 | 山东大学 | Long period optical fibre grating ultraviolet laser point-to-point writing method |
| CN104698531A (en) * | 2015-02-10 | 2015-06-10 | 山东交通学院 | Device and method for preparing long-periodic fiber bragg grating by femtosecond laser Talbot effect |
| CN106707406A (en) * | 2016-11-02 | 2017-05-24 | 北京信息科技大学 | System for producing long-cycle optical fiber grating based on femtosecond laser direct writing method |
| CN106526741A (en) * | 2016-12-27 | 2017-03-22 | 南京理工大学 | Device for manufacturing spiral core long-period fiber grating |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730331A (en) * | 2020-12-04 | 2021-04-30 | 北京信息科技大学 | Femtosecond laser direct-writing photonic chip diffraction grating detection method |
| CN112558215A (en) * | 2020-12-07 | 2021-03-26 | 北京信息科技大学 | Step type equal-grid-pitch grating based on femtosecond laser technology and preparation method thereof |
| CN113029333A (en) * | 2021-03-29 | 2021-06-25 | 中南大学 | Laser power detection device and measurement method thereof |
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Application publication date: 20180612 |