CN109655964A - Online preparation has the method and device of the long-period fiber grating of fixed point coating - Google Patents
Online preparation has the method and device of the long-period fiber grating of fixed point coating Download PDFInfo
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- CN109655964A CN109655964A CN201910151131.2A CN201910151131A CN109655964A CN 109655964 A CN109655964 A CN 109655964A CN 201910151131 A CN201910151131 A CN 201910151131A CN 109655964 A CN109655964 A CN 109655964A
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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
-
- 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
- G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
- G02B6/021—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the core or cladding or coating, e.g. materials, radial refractive index profiles, cladding shape
- G02B6/02104—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the core or cladding or coating, e.g. materials, radial refractive index profiles, cladding shape characterised by the coating external to the cladding, e.g. coating influences grating properties
-
- 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
- G02B6/02147—Point by point fabrication, i.e. grating elements induced one step at a time along the fibre, e.g. by scanning a laser beam, arc discharge scanning
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The present invention devises a kind of method and device of long-period fiber grating of the online preparation with fixed point coating, when optical fiber is from cooling after drawing out in graphite furnace on wire-drawer-tower, the photoelectric encoder after wire-drawer-tower initiative traction wheel starts to emit pulse every unit distance with initiative traction wheel rotation.Pulse counter at laser receives pulse and starts counting.When count value reaches setting value, triggering laser emits laser pulse.Laser pulse is by phase/amplitude mask plate, and the refractive index of regional area forms cyclically-varying structure on fiber core.Coating unit is started according to step-by-step counting setting value positioned at pulse counter on coating unit simultaneously.Coating unit adjusts the length and thickness of applying coating by starting length of time, and coating material can be various functional materials.
Description
Technical field
The invention belongs to fiber grating preparation technical fields, more particularly to a kind of online preparation to have the long week of fixed point coating
The method and device of phase fiber grating.
Background technique
With the development of the times, the requirement to fibre optical sensor is continuously improved.At present fibre optical sensor just towards high-performance,
The direction of large capacity, many reference amounts and array is developed.Develop fiber optic sensor network of new generation and has become the information-based wave of a new round
The key subjects of tide.
Long-period fiber grating is New Generation Optical passive device, and good, the small in size, using flexible with stability is passed in light
Sense and the application of optical communication field are also further extensive.By on the optical fiber longitudinal axis carry out periodic refractive index modulation, by basic mode coupling
It closes in cladding mode, spectrally shows the loss of specific wavelength.By coating different materials on long-period gratings surface
Material, long-period gratings can measure the various parameters such as temperature, humidity, refractive index, strain, hydrogen.Tradition prepares long-period gratings
The method of sensor is normally based on to be prepared offline.Optical fiber removes coat after the completion of preparation, is then carved using laser
It writes, is finally coated with various sensitive coating materials.The long-period grating sensor of this method preparation can be applied in temperature, wet
The sensory fields such as degree, refractive index.But this method preparation efficiency is low, when needing largely to use long-period grating sensor,
It needs to prepare for a long time.Also, during removing optical fiber coating, easily make optical fiber surface mechanically damaged.This makes
Sensor intensity is obtained to be greatly lowered.
Chinese patent CN107632336A has invented a kind of long-period gratings and preparation method thereof.Utilize high-NA light
Fibre heats optical fiber with carbon dioxide laser transmitting laser after removing optical fiber coating.By allowing high-NA
Fibre core in doped chemical diffusion, mould field becomes larger.The structure of this repeatability just constitutes long-period gratings.This method needs
Coat is removed, not only preparation efficiency is low and is easy to damage sensor, reduces sensor intensity.
Chinese patent CN106018350A invented a kind of long-period fiber grating SPR heavy metal ion sensing head and its
Production method.The invention plates layer of metal film on long-period fiber grating surface, then prepares another layer in metallic film surface
Modification of chitosan film.Couple light into surface excitation spr signal by long-period gratings, sensor be able to detect heavy metal from
Son.But the preparation of this method need it is a large amount of in use, preparation time-consuming, it is difficult to quick large scale preparation.
Summary of the invention
The technical problem to be solved by the invention is to provide the long period optical fiber light that a kind of online preparation has fixed point coating
The method and device of grid realizes quick large scale preparation.
The technical solution adopted by the present invention to solve the technical problems is: present invention firstly provides a kind of online preparations to have
Pinpoint the device of the long-period fiber grating of coating, comprising: preform and feeding device, graphite furnace, coating unit, solidification
Furnace, initiative traction wheel, phase mask plate；Preform and feeding device are used to that prefabricated rods to be sent into graphite according to pre-set velocity
In furnace, temperature gradient and temperature level are controllable in graphite furnace, melt prefabricated rods tip, and initiative traction wheel drives according to setting speed
Fiber rotation, the photoelectric encoder after being mounted on initiative traction wheel send pulse according to the long size of arc of rotation；According to step-by-step counting
Device instruction, laser emit laser pulse, and laser pulse forms interference fringe by phase mask plate, forms the period on optical fiber
The striped of property, inscribes a long-period fiber grating；Coating unit receives instruction, and it is thick to coat setting in grating surface partial region
Degree, length, material special coating, into curing oven；Coating unit is applied in grating surface partial region and is covered according to instruction
The special coating for determining thickness, length, material, subsequently into solidification equipment.
The present invention also provides a kind of online preparations using above-mentioned apparatus to have the long-period fiber grating of fixed point coating
Method, method includes the following steps:
Step 1 after prefabricated rods are drawn into optical fiber by the thawing of wire-drawer-tower graphite furnace, passes through lens group and phase by laser
The interference fringe irradiation that mask plate is formed；Step 2, femtosecond laser are formd in optical fiber surface and core region and are periodically lacked
Region is fallen into, long-period gratings are formed；Step 3, according to the arteries and veins for being located at the subsequent luminous point encoder sending of wire-drawer-tower initiative traction wheel
Signal is rushed, the pulse counter return pulse signal in femto-second laser simultaneously emits laser pulse according to setting value；Step
Four, the counter return pulse signal on coating unit and the starting when counting reaches setting value；Step 5, coating unit
It is coated in the length and thickness of the coating material of grating surface partial region according to the control of the length of starting time, subsequently enters solid
Change and solidifies in furnace；Step 6, multiple coating unit series connection, forms multiple light with different coating region on fiber grating surface
Gate sensor.
According to the above technical scheme, initiative traction wheel fiber clamping sends pulse signal according to outer arc side unit turn distance,
It is calculated by following formula:
R=2 × π * R/N,
In formula, r is the arc length interval that photoelectric encoder sends signal, i.e., outer arc side unit turn distance；R is actively to draw
The radius of wheel；N is the pulse signal number that one circle photoelectric encoder of initiative traction wheel rotation is sent.
According to the above technical scheme, the setting value of pulse counter is L/r in laser, and L is is inscribed according to actual needs
The interval of grating is reset after count value reaches.
According to the above technical scheme, upon power-up of the system, laser emits first laser pulse, subsequent each pulse counter
It all resets, and is distributed as the grating a little, inscribed is started counting with inscribing positional symmetry.
According to the above technical scheme, when in coating unit pulse counter for the first time count when, setting value be (L0 ±
K)/r, wherein L0 is the interval that position and coating unit of the laser pulse on optical fiber coat position on optical fiber, and k is to deviate
The length of raster center；Subsequent pulse counter, which counts, to reset, and subsequent setting value is L/r.
The present invention also provides a kind of method that online preparation has the long-period fiber grating of fixed point coating, this method includes
Following steps, step 1 after prefabricated rods are drawn into optical fiber by the thawing of wire-drawer-tower graphite furnace, pass through lens group and phase by laser
The interference fringe irradiation that mask plate is formed；Step 2, femtosecond laser are formd in optical fiber surface and core region and are periodically lacked
Region is fallen into, long-period gratings are formed；Step 3, according to the arteries and veins for being located at the subsequent luminous point encoder sending of wire-drawer-tower initiative traction wheel
Signal is rushed, the pulse counter return pulse signal in initiative traction wheel simultaneously emits pulse signal according to setting value；Step
Four, laser return pulse signal simultaneously emits laser pulse.Coating unit return pulse signal, after delay procedure, starting
Special type coating transposition；Step 5, coating unit are coated in the painting of grating surface partial region according to the length control of starting time
The length and thickness of layer material, subsequently enter in curing oven and solidify；Step 6, multiple coating unit series connection, can be in optical fiber light
Grid surface forms multiple grating sensors with different coating region.
According to the above technical scheme, initiative traction wheel fiber clamping sends pulse signal according to outer arc side unit turn distance,
It is calculated by formula once:
R=2 × π * R/N,
In formula, r is the arc length interval that photoelectric encoder sends signal, i.e., outer arc side unit turn distance；R is actively to draw
The radius of wheel；N is the pulse signal number that one circle photoelectric encoder of initiative traction wheel rotation is sent.
According to the above technical scheme, the setting value of pulse counter is L/r, L be according to be actually needed between inscription grating
Every；It is reset after count value reaches.
According to the above technical scheme, the delay duration of delay procedure is (L0 ± k)/v, and wherein L0 is laser pulse in optical fiber
On position and coating unit the interval of position is coated on optical fiber, k is the length for deviateing raster center, and v is drawing optical fibers speed
Degree；Then when grating spacings L is less than L0, the delay duration of delay procedure is (LL ± k)/v, wherein LL=L0mod L, i.e. LL
It is LO divided by the remainder of L, when grating spacings L is more than or equal to L, when a length of (L0 ± k)/v of delay procedure, mod is to take
Remaining operator.
The beneficial effect comprise that: long-period fiber grating is prepared online, it can be extensive, inexpensive, efficient
The good preparation long-period fiber grating of rate, consistency；When by inscribing long-period fiber grating online, in long-period fiber grating
Surface coats different coating material, and long-period fiber grating sensor is enabled to measure multiple parameters simultaneously.It is online to inscribe tool
There is the long-period fiber grating of fixed point coating, preparation that can be extensive, efficient, inexpensive has many reference amounts measurement capability simultaneously
Long-period fiber grating sensor.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is that there is online extensive inscribe the apparatus structure of the long-period gratings of fixed point coating to show in the embodiment of the present invention
It is intended to；
Fig. 2 is the method flow diagram of the embodiment of the present invention one；
Fig. 3 is the method flow diagram of the embodiment of the present invention two；
Fig. 4 is the long period optical fibre sensor structure schematic diagram with fixed point coating prepared in the embodiment of the present invention；
Fig. 5 is the transmission spectrum of the long period fibre optical sensor of preparation of the embodiment of the present invention；
In Fig. 1: 101- preform and feeding device, 102- graphite furnace, 103- coating unit, 104- solidification equipment,
105- coating unit, 106- solidification equipment, 107- initiative traction wheel and take-up, 108- phase mask plate, 109- laser.
In Fig. 4: 401- optical fiber applies outside, 402- optical fiber quartz layer, applies in 403- optical fiber, 404- grating, and 405- optical fiber one applies
Layer material, 406- fiber core, another coating material of 407- optical fiber, another coating material of 408- optical fiber.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Embodiment one:
In the embodiment of the present invention, a kind of long-period fiber grating of the online large scale preparation with fixed point coating is provided first
Device, as shown in Figure 1, comprising: preform and feeding device 10111, graphite furnace 102, coating unit 103, curing oven
104, coating unit 105, solidification equipment 106, initiative traction wheel 107, phase mask plate 108, laser 109.
Preform and feeding device 101 are used to that prefabricated rods to be sent into graphite furnace according to command speed.Graphite furnace 102
Interior temperature gradient and temperature level are controllable, melt prefabricated rods tip.Initiative traction wheel 107 drives optical fiber to turn according to setting speed
It is dynamic.Photoelectric encoder after being mounted on initiative traction wheel sends pulse according to the long size of arc of rotation.It is instructed according to pulse counter,
Laser 109 emits laser pulse.Laser pulse forms interference fringe by phase mask plate 108, and the period is formed on optical fiber
The striped of property, inscribes a long-period fiber grating.Coating unit 103 receives instruction, applies and covers in grating surface partial region
Determine the special coating of thickness, length, material.Subsequently into curing oven 104.Device 105 is subsequently coated with according to instruction, in grating
Surface portion region coating sets the special coating of thickness, length, material, subsequently into curing oven 106.Last take-up
Optical Fiber Winding is kept well.
According to actual needs, the quantity of coating unit and curing oven, position can be changed.
Embodiment two:
There is the device of the long-period fiber grating of fixed point coating, the present embodiment using the online large scale preparation of embodiment kind
A kind of method of long-period fiber grating of the online large scale preparation with fixed point coating is provided, as shown in Figure 2.
Preform enters in curing oven under feeding device to be melted, and initiative traction wheel drives fiber rotation.Positioned at master
The dynamic subsequent photoelectric encoder of traction wheel is according to the long transmitting pulse signal of initiative traction wheel arc of rotation.Pulse signal cycle corresponds to light
The minimum resolution of fine length, minimum resolution are determined according to the yardage of photoelectric encoder and the radius of initiative traction wheel.It is minimum
Resolution ratio is calculated according to following formula:
R=2 × π × R/N,
In formula, r is the arc length interval that photoelectric encoder sends signal, i.e. minimum resolution；R is the half of initiative traction wheel
Diameter；N is the pulse signal number that initiative traction wheel per revolution photoelectric encoder is sent.
When total system starts, laser emits a laser pulse, and then all step-by-step countings are all reset, and with this
To start counting a little.
When formally bringing into operation, laser is triggered when the counting of the first pulse counter reaches setting value and emits laser arteries and veins
Punching, laser pulse form interference fringe by phase mask plate.Interference fringe forms refractive index periodic distribution on optical fiber
Region forms long-period fiber grating.Then the first pulse counter resets New count of laying equal stress on.The setting of first pulse counter
Value be L/r, L be according to be actually needed inscription grating interval.
Emit the rule of pulse signal according to photoelectric encoder, the numerical value of the first pulse counter multiplied by it is minimum it is distinguishable away from
From being converted to drawing optical fibers length, fiber lengths are the distance between adjacent gratings；When drawing optical fibers length is less than adjacent light
When the distance between grid, pulse counter continues to count；If length of string is equal to the spacing of adjacent gratings, driver is opened
It is dynamic.If grating spacings are L, when the signal that the first pulse counter receives reaches L/r, emit pulse signal, triggering swashs
Light device completes the inscription of a grating.First pulse counter resets and starts counting again.
Trigger coating unit 1 when the counting of the second pulse counter reaches setting value, coating unit 1 is according to setting
Program coats the coating of certain length, thickness and material in fiber grating surface specific region.The second pulse counter is clear simultaneously
It zero and starts counting again.
Second pulse counter counts when laser emits first laser pulse and resets and start counting again.Arteries and veins
The position and coating unit 1 of laser that the setting value of counter first time is issued according to laser on optical fiber are rushed in fiber grating
Surface specific region is related.Fiber grating inscribes positional symmetry distribution in optical fiber with laser pulse.Laser emits laser pulse
When, corresponding vertical place, as position of the grating on optical fiber on optical fiber.Second pulse counter first time setting value
Are as follows:
(L0 ± k)/r,
Wherein L0 is the interval that position of the laser pulse on optical fiber and coating unit 1 coat position on optical fiber, and k is
Deviate the length of raster center.Subsequent second pulse counter, which counts, to reset, and subsequent setting value is L/r.
Subsequent optical fiber, which enters in curing oven, to be solidified.
Optical fiber continuation is run under the drive of initiative traction wheel.The touching when the counting of third pulse counter reaches setting value
Coating unit 2 is sent out, coating unit 2 coats certain length, thickness in fiber grating surface specific region according to the program set
With the coating of material.Third pulse counter resets and starts counting again simultaneously.
Third pulse counter counts when laser emits first laser pulse and resets and start counting again.Arteries and veins
The position and coating unit 2 of femtosecond laser that the setting value of counter first time is issued according to laser on optical fiber are rushed in optical fiber
Grating surface specific region is related.Fiber grating inscribes positional symmetry distribution in optical fiber with laser pulse.Laser emits laser
When pulse, corresponding vertical place, as position of the grating on optical fiber on optical fiber.Third pulse counter is set for the first time
Definite value are as follows:
(L1 ± k)/r,
Wherein L1 is the interval that position of the laser pulse on optical fiber and coating unit 2 coat position on optical fiber, and k is
Deviate the length of raster center.Subsequent second pulse counter, which counts, to reset, and subsequent setting value is L/r.
Subsequent optical fiber, which enters in curing oven, to be solidified.
According to actual needs, more coating units and solidification equipment can be installed.Its setting value is set according to the method described above
It sets.
Optical fiber enters in take-up after coating, and upper disk saves.
Embodiment three:
There is the device of the long-period fiber grating of fixed point coating using the online large scale preparation of kind described in embodiment one,
The present embodiment provides a kind of methods that online large scale preparation has the long-period fiber grating of fixed point coating, as shown in Figure 3.
Preform enters in curing oven under feeding device to be melted, and initiative traction wheel drives fiber rotation.Positioned at master
The dynamic subsequent photoelectric encoder of traction wheel is according to the long transmitting pulse signal of initiative traction wheel arc of rotation.Pulse signal cycle corresponds to light
The minimum resolution of fine length, minimum resolution are determined according to the yardage of photoelectric encoder and the radius of initiative traction wheel.It is minimum
Resolution ratio is calculated according to following formula:
R=2 × π × R/N,
In formula, r is the arc length interval that photoelectric encoder sends signal, i.e. minimum resolution；R is the half of initiative traction wheel
Diameter；N is the pulse signal number that initiative traction wheel per revolution photoelectric encoder is sent.
Pulse counter return pulse signal in initiative traction wheel simultaneously emits pulse signal according to setting value.Pulse
The setting value of signal be L/r, L be according to be actually needed inscription grating interval.Laser return pulse signal simultaneously emits sharp
Light pulse.Laser pulse forms interference fringe by phase mask plate.Interference fringe forms refractive index periodic point on optical fiber
The region of cloth forms and inscribes grating.Then pulse counter resets New count of laying equal stress on.
Emit the rule of pulse signal according to photoelectric encoder, the numerical value of pulse counter multiplied by minimum distinguishable distance,
Drawing optical fibers length is converted to, fiber lengths are the distance between adjacent gratings；When drawing optical fibers length is less than adjacent gratings
The distance between when, pulse counter continues to count；If length of string is equal to the spacing of adjacent gratings, emit pulse signal.
If grating spacings are L, when the signal that pulse counter receives reaches L/r, emit pulse signal, pulse counter is reset
And it starts counting again.
1 return pulse signal of coating unit triggers driver 2, then starts coating unit after delay procedure 1
1.Coating unit 1 coats the painting of certain length, thickness and material in fiber grating surface specific region according to the program set
Layer.
Position of the laser that the delay duration of delay procedure is issued according to laser on optical fiber and coating unit 1 are in optical fiber
Grating surface specific region is related.Fiber grating inscribes positional symmetry distribution in optical fiber with laser pulse.
When laser transmitting laser pulse, corresponding vertical place, as position of the grating on optical fiber on optical fiber.
Delay procedure delay duration are as follows:
(L0 ± k)/v,
Wherein L0 is the interval that position of the laser pulse on optical fiber and coating unit 1 coat position on optical fiber, and k is
Deviate the length of raster center, v is drawing speed of optical fiber.
After delay procedure 1 completes first time, when grating spacings L is less than L0, the delay duration of delay procedure is changed to:
(LL ± k)/v, wherein LL=L0mod L, i.e. LL are remainder of the L0 divided by L.When grating spacings are more than or equal to L0, delay
When a length of (L0 ± k)/v of program.
2 return pulse signal of coating unit triggers driver 3, then starts coating unit after delay procedure 2
2.Coating unit 2 coats the painting of certain length, thickness and material in fiber grating surface specific region according to the program set
Layer.
Position of the laser that the delay duration of delay procedure is issued according to laser on optical fiber and coating unit 1 are in optical fiber
Grating surface specific region is related.Fiber grating inscribes positional symmetry distribution in optical fiber with laser pulse.Laser emits laser
When pulse, corresponding vertical place, as position of the grating on optical fiber on optical fiber.Delay procedure delay duration are as follows:
(L1 ± k)/v,
Wherein L1 is the interval that position of the laser pulse on optical fiber and coating unit 2 coat position on optical fiber, and k is
Deviate the length of raster center, v is drawing speed of optical fiber.
After delay procedure 2 completes first time, when grating spacings L is less than L1, the delay duration of delay procedure is changed to:
(LL1 ± k)/v, wherein LL1=L1mod L, i.e. LL1 are remainder of the L1 divided by L.When grating spacings are more than or equal to L0,
When a length of (L0 ± k)/v of delay procedure.
According to actual needs, more coating units and solidification equipment can be installed.Its setting value is set according to the method described above
It sets.
Optical fiber enters in take-up after coating, and upper disk saves.
Through the foregoing embodiment two and embodiment tripartite's method prepare have fixed point coating long period Fibre Optical Sensor
Device is as shown in figure 4, inscribe grating 404 on fiber core, optical fiber quartz layer 402, optical fiber coating 403 outside fiber core 406,
Optical fiber external coating 401 outside optical fiber coating, one coating material 405 of optical fiber, another coating material 407 of optical fiber, another painting of optical fiber
Layer material 408.Its transmission spectrum is as shown in Figure 5.
Example IV:
A kind of method that online large scale preparation has the long-period fiber grating for pinpointing coating, preform are being fed
Enter in curing oven under device and melt, initiative traction wheel drives fiber rotation.Positioned at the subsequent photoelectric encoder of initiative traction wheel
According to the long transmitting pulse signal of initiative traction wheel arc of rotation.Pulse signal cycle corresponds to the minimum resolution of fiber lengths, minimum
Resolution ratio is determined according to the yardage of photoelectric encoder and the radius of initiative traction wheel.Minimum resolution is calculated according to following formula:
R=2 × π × R/N,
In formula, r is the arc length interval that photoelectric encoder sends signal, i.e. minimum resolution；R is the half of initiative traction wheel
Diameter；N is the pulse signal number that initiative traction wheel per revolution photoelectric encoder is sent.
When total system starts, laser emits a laser pulse, and then all step-by-step countings are all reset, and with this
To start counting a little.
When formally bringing into operation, laser is triggered when the counting of the first pulse counter reaches setting value and emits laser arteries and veins
Punching, laser pulse form interference fringe by phase mask plate.Interference fringe forms refractive index periodic distribution on optical fiber
Region forms long-period fiber grating.Then the first pulse counter resets New count of laying equal stress on.The setting of first pulse counter
Value be L/r, L be according to be actually needed inscription grating interval.
Emit the rule of pulse signal according to photoelectric encoder, the numerical value of the first pulse counter multiplied by it is minimum it is distinguishable away from
From being converted to drawing optical fibers length, fiber lengths are the distance between adjacent gratings；When drawing optical fibers length is less than adjacent light
When the distance between grid, pulse counter continues to count；If length of string is equal to the spacing of adjacent gratings, driver is opened
It is dynamic.If grating spacings are L, when the signal that the first pulse counter receives reaches L/r, emit pulse signal, triggering swashs
Light device completes the inscription of a grating.First pulse counter resets and starts counting again.
Trigger coating unit 1 when the counting of the second pulse counter reaches setting value, coating unit 1 is according to setting
Program coats the coating of certain length, thickness and material in fiber grating surface specific region.The second pulse counter is clear simultaneously
It zero and starts counting again.
Second pulse counter counts when laser emits first laser pulse and resets and start counting again.Arteries and veins
The position and coating unit 1 of laser that the setting value of counter first time is issued according to laser on optical fiber are rushed in fiber grating
Surface specific region is related.Fiber grating inscribes positional symmetry distribution in optical fiber with laser pulse.Laser emits laser pulse
When, corresponding vertical place, as position of the grating on optical fiber on optical fiber.Second pulse counter first time setting value
Are as follows:
(L0 ± k)/r,
Wherein L0 is the interval that position of the laser pulse on optical fiber and coating unit 1 coat position on optical fiber, and k is
Deviate the length of raster center.Subsequent second pulse counter, which counts, to reset, and subsequent setting value is L/r.
Subsequent optical fiber, which enters in curing oven, to be solidified.
Optical fiber continuation is run under the drive of initiative traction wheel.The touching when the counting of third pulse counter reaches setting value
Coating unit 2 is sent out, coating unit 2 coats certain length, thickness in fiber grating surface specific region according to the program set
With the coating of material.Third pulse counter resets and starts counting again simultaneously.
Third pulse counter counts when laser emits first laser pulse and resets and start counting again.Arteries and veins
The position and coating unit 2 of femtosecond laser that the setting value of counter first time is issued according to laser on optical fiber are rushed in optical fiber
Grating surface specific region is related.Fiber grating inscribes positional symmetry distribution in optical fiber with laser pulse.Laser emits laser
When pulse, corresponding vertical place, as position of the grating on optical fiber on optical fiber.Third pulse counter is set for the first time
Definite value are as follows:
(L1 ± k)/r,
Wherein L1 is the interval that position of the laser pulse on optical fiber and coating unit 2 coat position on optical fiber, and k is
Deviate the length of raster center.Subsequent second pulse counter, which counts, to reset, and subsequent setting value is L/r.
Embodiment five:
A kind of method that online large scale preparation has the long-period fiber grating for pinpointing coating, preform are being fed
Enter in curing oven under device and melt, initiative traction wheel drives fiber rotation.Positioned at the subsequent photoelectric encoder of initiative traction wheel
According to the long transmitting pulse signal of initiative traction wheel arc of rotation.Pulse signal cycle corresponds to the minimum resolution of fiber lengths, minimum
Resolution ratio is determined according to the yardage of photoelectric encoder and the radius of initiative traction wheel.Minimum resolution is calculated according to following formula:
R=2 × π × R/N,
In formula, r is the arc length interval that photoelectric encoder sends signal, i.e. minimum resolution；R is the half of initiative traction wheel
Diameter；N is the pulse signal number that initiative traction wheel per revolution photoelectric encoder is sent.
Pulse counter return pulse signal in initiative traction wheel simultaneously emits pulse signal according to setting value.Pulse
The setting value of signal be L/r, L be according to be actually needed inscription grating interval.Laser return pulse signal simultaneously emits sharp
Light pulse.Laser pulse forms interference fringe by phase mask plate.Interference fringe forms refractive index periodic point on optical fiber
The region of cloth forms and inscribes grating.Then pulse counter resets New count of laying equal stress on.
Emit the rule of pulse signal according to photoelectric encoder, the numerical value of pulse counter multiplied by minimum distinguishable distance,
Drawing optical fibers length is converted to, fiber lengths are the distance between adjacent gratings；When drawing optical fibers length is less than adjacent gratings
The distance between when, pulse counter continues to count；If length of string is equal to the spacing of adjacent gratings, emit pulse signal.
If grating spacings are L, when the signal that pulse counter receives reaches L/r, emit pulse signal, pulse counter is reset
And it starts counting again.
1 return pulse signal of coating unit triggers driver 2, then starts coating unit after delay procedure 1
1.Coating unit 1 coats the painting of certain length, thickness and material in fiber grating surface specific region according to the program set
Layer.
Position of the laser that the delay duration of delay procedure is issued according to laser on optical fiber and coating unit 1 are in optical fiber
Grating surface specific region is related.Fiber grating inscribes positional symmetry distribution in optical fiber with laser pulse.Laser emits laser
When pulse, corresponding vertical place, as position of the grating on optical fiber on optical fiber.Delay procedure delay duration are as follows:
(L0 ± k)/v,
Wherein L0 is the interval that position of the laser pulse on optical fiber and coating unit 1 coat position on optical fiber, and k is
Deviate the length of raster center, v is drawing speed of optical fiber.
After delay procedure 1 completes first time, when grating spacings L is less than L0, the delay duration of delay procedure is changed to:
(LL ± k)/v, wherein LL=L0mod L, i.e. LL are remainder of the L0 divided by L.When grating spacings are more than or equal to L0, delay
When a length of (L0 ± k)/v of program.
2 return pulse signal of coating unit triggers driver 3, then starts coating unit after delay procedure 2
2.Coating unit 2 coats the painting of certain length, thickness and material in fiber grating surface specific region according to the program set
Layer.
Position of the laser that the delay duration of delay procedure is issued according to laser on optical fiber and coating unit 1 are in optical fiber
Grating surface specific region is related.Fiber grating inscribes positional symmetry distribution in optical fiber with laser pulse.Laser emits laser
When pulse, corresponding vertical place, as position of the grating on optical fiber on optical fiber.Delay procedure delay duration are as follows:
(L1 ± k)/v,
Wherein L1 is the interval that position of the laser pulse on optical fiber and coating unit 2 coat position on optical fiber, and k is
Deviate the length of raster center, v is drawing speed of optical fiber.
After delay procedure 2 completes first time, when grating spacings L is less than L1, the delay duration of delay procedure is changed to:
(LL1 ± k)/v, wherein LL1=L1mod L, i.e. LL1 are remainder of the L1 divided by L.When grating spacings are more than or equal to L0,
When a length of (L0 ± k)/v of delay procedure.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. the device that a kind of online preparation has the long-period fiber grating of fixed point coating characterized by comprising optical fiber prefabricating
Stick and feeding device, graphite furnace, coating unit, curing oven, initiative traction wheel, phase mask plate；
Preform and feeding device are used to that prefabricated rods to be sent into graphite furnace according to pre-set velocity, temperature gradient in graphite furnace
And temperature level is controllable, melts prefabricated rods tip, initiative traction wheel drives fiber rotation according to setting speed, is mounted on and actively leads
Photoelectric encoder after running wheel sends pulse according to the long size of arc of rotation；It is instructed according to pulse counter, laser emits laser
Pulse, laser pulse form interference fringe by phase mask plate, and periodic striped is formed on optical fiber, inscribe a long week
Phase fiber grating；Coating unit receives instruction, coats setting thickness, length, the extraordinary of material in grating surface partial region and applies
Layer, into curing oven；Coating unit coats the spy of setting thickness, length, material according to instruction, in grating surface partial region
Kind coating, subsequently into solidification equipment.
2. there is the method for the long-period fiber grating of fixed point coating using the online preparation of claim 1 described device, it is special
Sign is, method includes the following steps:
Step 1 after prefabricated rods are drawn into optical fiber by the thawing of wire-drawer-tower graphite furnace, passes through lens group and phase mask by laser
The interference fringe irradiation that plate is formed；Step 2, femtosecond laser form periodic defect area in optical fiber surface and core region
Domain forms long-period gratings；Step 3 is believed according to the pulse that the subsequent luminous point encoder of wire-drawer-tower initiative traction wheel issues is located at
Number, pulse counter return pulse signal in femto-second laser simultaneously emits laser pulse according to setting value；Step 4, position
In the counter return pulse signal on coating unit and the starting when counting reaches setting value；Step 5, coating unit according to
The length and thickness for starting coating material of the length control coated in grating surface partial region of time, subsequently enter curing oven
Middle solidification；Step 6, multiple coating unit series connection form multiple gratings with different coating region on fiber grating surface and pass
Sensor.
3. the method that online preparation according to claim 2 has the long-period fiber grating of fixed point coating, feature exist
In initiative traction wheel fiber clamping sends pulse signal according to outer arc side unit turn distance, calculated by following formula:
R=2 × π * R/N,
In formula, r is the arc length interval that photoelectric encoder sends signal, i.e., outer arc side unit turn distance；R is initiative traction wheel
Radius；N is the pulse signal number that one circle photoelectric encoder of initiative traction wheel rotation is sent.
4. the method that online preparation according to claim 2 or 3 has the long-period fiber grating of fixed point coating, feature
Be, in laser the setting value of pulse counter be L/r, L be according to be actually needed inscription grating interval, work as count value
It is reset after reaching.
5. the method that online preparation according to claim 2 or 3 has the long-period fiber grating of fixed point coating, feature
It is, upon power-up of the system, laser emits first laser pulse, and then each pulse counter is all reset, and as
The grating a little, inscribed is started counting to inscribe positional symmetry distribution.
6. the method that online preparation according to claim 2 or 3 has the long-period fiber grating of fixed point coating, feature
It is, when the pulse counter in coating unit counts for the first time, setting value is (L0 ± k)/r, and wherein L0 is laser
Position and coating unit of the pulse on optical fiber coat the interval of position on optical fiber, and k is the length for deviateing raster center；Then
Pulse counter, which counts, to reset, and subsequent setting value is L/r.
7. there is the method for the long-period fiber grating of fixed point coating using the online preparation of claim 1 described device, it is special
Sign is that this approach includes the following steps, step 1, after prefabricated rods are drawn into optical fiber by the thawing of wire-drawer-tower graphite furnace, is swashed
The interference fringe irradiation that light is formed by lens group and phase mask plate；Step 2, femtosecond laser is in optical fiber surface and core region
Domain forms periodic defect area, forms long-period gratings；Step 3, according to being located at, wire-drawer-tower initiative traction wheel is subsequent
The pulse signal that luminous point encoder issues, pulse counter return pulse signal in initiative traction wheel and according to setting value
Emit pulse signal；Step 4, laser return pulse signal simultaneously emit laser pulse.Coating unit return pulse signal, warp
After crossing delay procedure, start extraordinary coating transposition；Step 5, coating unit are coated in grating according to the length control of starting time
The length and thickness of the subregional coating material of surface element, subsequently enter in curing oven and solidify；Step 6, multiple coating unit strings
Connection, can form multiple grating sensors with different coating region on fiber grating surface.
8. the method that online preparation according to claim 7 has the long-period fiber grating of fixed point coating, feature exist
In initiative traction wheel fiber clamping sends pulse signal according to outer arc side unit turn distance, calculated by formula once:
R=2 × π * R/N,
In formula, r is the arc length interval that photoelectric encoder sends signal, i.e., outer arc side unit turn distance；R is initiative traction wheel
Radius；N is the pulse signal number that one circle photoelectric encoder of initiative traction wheel rotation is sent.
9. the method that online preparation according to claim 7 or 8 has the long-period fiber grating of fixed point coating, feature
Be, the setting value of pulse counter is L/r, L be according to be actually needed inscription grating interval；It is clear after count value reaches
Zero.
10. the method that online preparation according to claim 7 or 8 has the long-period fiber grating of fixed point coating, special
Sign is that the delay duration of delay procedure is (L0 ± k)/v, and wherein L0 is that position of the laser pulse on optical fiber and coating fill
The interval that position is coated on optical fiber is set, k is the length for deviateing raster center, and v is drawing speed of optical fiber；Then work as grating spacings
When L is less than L0, the delay duration of delay procedure is (LL ± k)/v, wherein LL=L0mod L, i.e. LL is remainder of the LO divided by L,
When grating spacings L is more than or equal to L, when a length of (L0 ± k)/v of delay procedure, mod are remainder operator.
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