CN107990926A - Fiber grating based on wavelength shift locks demodulating system and method one by one - Google Patents
Fiber grating based on wavelength shift locks demodulating system and method one by one Download PDFInfo
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- G—PHYSICS
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- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
Abstract
The present invention relates to a kind of fiber grating based on wavelength shift to lock demodulating system one by one, it includes microcontroller, bragg grating ripple deflection device, bragg grating labelling apparatus, traction wheel, collimater, (FBG) demodulator and computer, wherein, the data communication end connection of the data communication end connection microcontroller of computer, the control signal input of the inclined control signal output connection bragg grating ripple deflection device of bragg grating ripple of microcontroller, the signal input part of the bragg grating marking of control signal output part connection bragg grating labelling apparatus of microcontroller, the initiating terminal of one end access bragg grating sensor array of collimater, the other end connects the optical signal communications end of (FBG) demodulator.The present invention can carry out quality testing to the FBG that is inscribed online, have that demodulation speed is fast, power system capacity is big.
Description
Technical field
The present invention relates to quasi-distributed optical fiber sensing detection technical field, and in particular to a kind of optical fiber based on wavelength shift
Grating locks demodulating system and method one by one.
Background technology
Fibre optical sensor has the characteristics that electromagnetism interference, electrical insulation capability are good, corrosion-resistant, transmission loss is small, has it
His sensor incomparable advantage and application range.With the development of FBG technologies, FBG sensor by single-point detect by
Step develops into the quasi- distribution of multiple spot or super distributed detection, the multiplexing networking of FBG so that numerous sensing units can share a set of ripple
Long demodulated equipment, significantly reduces the cost of single sensor, improves the cost performance of sensor, promotes FBG sensing technologies
Application in fields such as large scale structure safety, aerospace, national defense and military and environmental monitorings.FBG is multiplexed the wide scope of networking
Using adding the application demand of large capacity grating array, the production task of FBG increased, at present for the large capacity of production
FBG arrays, are all that piecewise demodulates to detect the recording quality of FBG, this method ten respectively by segmentation after production
The problem of dividing inconvenience, not only taking consumption manpower, but also cannot find production in time causes larger waste；Therefore one kind is designed to exist
The device of the recording quality parameter of line monitoring FBG arrays (grating number is up to tens thousand of) is most important.
Currently, in order to improve the multiplexing capacity of FBG sensor arrays, mainly there is following several method：Wavelength-division multiplex (WDM),
Be time-multiplexed (TDM), space division multiplexing (SDM), and the combination multiplexing method of these types of multiplex mode.Above-mentioned several technologies are very
Big degree improves the multiplexing capacity of FBG sensor arrays, makes it possible that FBG sensor is multiplexed networking, but all there are itself
Shortcoming.For WDM multiplexing technologies since each FBG sensor takes certain spectral region, it is wide to be multiplexed quantity light source on simple optical fiber
Degree and measurement range limitation, are multiplexed negligible amounts；In TDM technologies, simple optical fiber from light source bandwidth influence, multiplexing capacity compared with
Greatly, but since each FBG sensor operation wavelength section is overlapping and presence signal crosstalk, the FBG of antiradar reflectivity can effectively drop
The influence of low crosstalk, but reflectivity is lower, and transducing signal is fainter, and signal-to-noise ratio is lower, it will so that subsequent demodulation is very difficult；
SDM technologies need photoswitch switching channel, realize different sensor array selections, there are insertion loss, spatial division multiplexing due to photoswitch
Bigger with the cascade more insertion loss of level, the addressing time of interchannel is longer, and system configuration is complicated.
Currently, FBG array sensings array demodulation method includes being based on optical time domain reflection (OTDR) demodulation techniques and optical frequency
(OFDR) demodulation techniques are reflected in domain.(" large capacity dim light grid sensing network is at a high speed for the patent No. 2014100788296.9 for Differential Compression
Demodulation method and device ") data transmission method, realize high efficiency of the high-capacity and high-speed FBG demodulating systems to big data quantity
Transmission, under 4KHz demodulation rates, FBG stationary singnal data compression rates have reached 16.56%, FBB sensor series quantity can
Reach 512.Light amplification is eventually after (" the vast capacity fiber grating based on optical amplification repeater passes the patent No. 201310450293.9
Sensing system ") super amount FBG sensor-based systems can overcome shadow effect in existing time-multiplexed FBG sensor-based systems and
Harmful effect of the signal cross-talk to demodulation, improve to large capacity, long range light FBG arrays (Fiber Bragg Grating,
Fiber grating) detection, FBG numbers can reach more than 1000.Above-mentioned several method can meet general application requirement,
But online fiber grating inscribes scene, FBG productions may be drawn several days in succession, and the FBG length of inscription has more than 50Km, and number reaches
As many as tens thousand of, the quality that the demodulation for this large capacity FBG arrays is inscribed with on-line real time monitoring grating, above-mentioned several sides
Method is difficult to meet the requirements, and temporarily also can solve the problems, such as this without disclosed technology.
The content of the invention
It is an object of the invention to for problems of the prior art, propose a kind of optical fiber light based on wavelength shift
Grid lock demodulating system and method one by one, and the present invention can carry out quality testing to the FBG inscribed online, have demodulation speed
It hurry up, the features such as power system capacity is big, stability is good, apparatus structure is simple.
In order to solve the above technical problems, a kind of fiber grating based on wavelength shift disclosed by the invention locks demodulation one by one
System, it is characterised in that：It includes microcontroller, bragg grating ripple deflection device, bragg grating labelling apparatus, leads
Running wheel, collimater, (FBG) demodulator and computer, wherein, the data communication end connection of the data communication end connection microcontroller of computer,
The control signal of the inclined control signal output connection bragg grating ripple deflection device of bragg grating ripple of microcontroller
Input terminal, the letter of the bragg grating marking of control signal output part connection bragg grating labelling apparatus of microcontroller
Number input terminal, bragg grating ripple deflection device are used to produce the bragg grating of bragg grating sensor array
Raw wavelength shift, bragg grating labelling apparatus are used for Prague light to being inscribed in bragg grating sensor array
Fine grating is marked；
The traction wheel is used to quartz pushrod draw online to form bragg grating sensor array, collimater
One end is used for the initiating terminal for accessing bragg grating sensor array, and the other end of collimater is used for the light letter for connecting (FBG) demodulator
Signal communication end, the (FBG) demodulator communication interface of the electrical signal communication end connection computer of (FBG) demodulator.
A kind of to lock demodulation method one by one using the fiber grating of said system, it includes the following steps：
Step 1：Computer control single chip computer, so as to control bragg grating ripple deflection device to set bragg fiber light
The bragg grating wavelength shift value of grid sensor array, and make the wavelength of bragg grating by the offset value offset,
(FBG) demodulator obtains bragg grating wavelength shift value from computer, and (FBG) demodulator passes through the bragg grating wavelength shift
The scanning wavelength scope of value adjustment (FBG) demodulator inner scanning light source and sweep spacing, wherein, scanning wavelength scope needs to include cloth
The centre wavelength of glug fiber grating, sweep spacing are predetermined interval；
Step 2：Open traction wheel so that traction wheel starts to draw raster manipulation online, quartz pushrod is formed Bradley
Lattice optical fibre optical grating sensing array, during drawing raster manipulation online, according to each light in bragg grating sensor array
Pitch from (FBG) demodulator position modulation (FBG) demodulator scan frequency, so as to ensure to include bragg fiber light in (FBG) demodulator acquisition range
The otdr signal of each grating in grid sensor array；
Step 3：Narrowband optical signal in the range of (FBG) demodulator output scanning wavelength, and the narrowband optical signal is modulated into light arteries and veins
Signal output is rushed, light pulse signal is by entering bragg grating sensor array after collimater；
Step 4：Filled partially when each grating in bragg grating sensor array is drawn to bragg grating ripple
When putting correspondence position, bragg grating ripple deflection device causes in bragg grating sensor array in corresponding grating
Cardiac wave, which is grown, to drift about, and the wavelength of the grating is deviated a distance from bragg grating sensor array overlapping wavelengths area,
Reach in wavelength domain as it can be seen that (FBG) demodulator locks the reflection spectral coverage of the grating in bragg grating sensor array, institute
Light pulse signal is stated to be scanned in the reflection spectral coverage region of the grating；
Step 5：The time-domain signal that (FBG) demodulator collection light pulse signal is reflected back in bragg grating sensor array,
And reflectance spectrum is spliced into according to the time-domain signal being reflected back, further according to reflectance spectrum and OTDR principles to bragg grating
The corresponding grating of current bragg grating ripple deflection device in sensor array is positioned；
Step 6：The reflectance spectrum of above-mentioned grating after positioning is demodulated, light is carried out to the reflectance spectrum after demodulation
Gate signal quality evaluation handles (bibliography：The Chinese lasers such as Wang Yuangan .2005,03), you can determine the quality of corresponding grating
Parameter, computer determine whether above-mentioned grating is qualified according to above-mentioned mass parameter；
Step 7：With the traction of traction wheel, which further moves, when Prague light
When the above-mentioned grating of quality examination had already passed through in fine grating sensing array moving to marker bit, bragg grating mark dress
Put the grating determined according to computer it is whether qualified as a result, carrying out quality status stamp to the grating.
The principle of the present invention is：FBG is with the tethered sliding of traction wheel, when moving at ripple deflection device, ripple deflection device
The parameters such as temperature or ess-strain by adjusting FBG so that the corresponding centre wavelengths of FBG are drifted about so that its wavelength
A distance is deviated from sensor array overlapping wavelengths area, is reached in wavelength domain as it can be seen that (FBG) demodulator locks FBG reflection spectral coverages
Fixed, narrow-band light source is quickly scanned near FBG reflection spectral coverages, while the optical time domain of data collecting module collected FBG is anti-
Signal is penetrated so as to be spliced into reflectance spectrum, the signal and OTDR principles arrived further according to data collecting module collected is realized to FBG
Positioning, be finally demodulated with certain demodulating algorithm, so as to quickly detect mass parameter.With leading for traction wheel
Draw, which further moves, when it is moved at labelling apparatus, after microcontroller is transferred to computer disposal according to (FBG) demodulator
As a result, it is whether up-to-standard according to FBG, select corresponding marker color.In FBG moving process, its final corresponding middle cardiac wave
Length is equal with the other raster center wavelength of FBG arrays.
The present invention proposes that the fiber grating based on wavelength shift locks demodulation techniques one by one, by simply before traction wheel
Install ripple deflection device and labelling apparatus additional, it is possible to which the quality of the light FBG to being inscribed is detected one by one, and is marked accordingly
Note.This method can not be demodulated the FBG arrays of large capacity enormous amount before easily solving the problems, such as, Ke Yi
Line carries out quality testing to the FBG inscribed, has demodulation speed is fast, power system capacity is big, stability is good, apparatus structure is simple etc.
Feature.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is optical fiber optical grating array of the present invention by wavelength change schematic diagram before and after ripple deflection device；
In Fig. 2, λ 1 is archicenter wavelength, and λ 2 is the centre wavelength after wavelength shift, and has 1 ≠ λ of λ 2.
Wherein, 1-microcontroller, 2-computer, 3-bragg grating ripple deflection device, 4-(FBG) demodulator, 5-traction
Wheel, 6-collimater, 7-bragg grating labelling apparatus, 8-bragg grating sensor array.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail：
A kind of fiber grating based on wavelength shift of the present invention locks demodulating system one by one, as shown in Figure 1, it includes list
Piece machine 1, bragg grating ripple deflection device 3 (optical fiber heating unit or optical fiber puller system), bragg grating mark
((FBG) demodulator 4 includes light source module, optical modulator module, data acquisition module, core for device 7, traction wheel 5, collimater 6, (FBG) demodulator 4
Heart control module) and computer 2, wherein, the data communication end connection of the serial data communication end connection microcontroller 1 of computer 2,
The control letter of the inclined control signal output connection bragg grating ripple deflection device 3 of bragg grating ripple of microcontroller 1
Number input terminal, the bragg grating marking of control signal output part connection bragg grating labelling apparatus 7 of microcontroller 1
Signal input part, bragg grating ripple deflection device 3 is used to make the bragg fiber of bragg grating sensor array 8
Grating generation wavelength deviates, and bragg grating labelling apparatus 7 is used for inscribing in bragg grating sensor array 8
Bragg grating is marked；
The traction wheel 5 is used to quartz pushrod draw online to form 8 (Prague of bragg grating sensor array
Optical fibre optical grating sensing array 8 is made of tens thousand of a FBG, and the centre wavelength of each FBG is identical or different), one end of collimater 6
For accessing the initiating terminal of bragg grating sensor array 8, the other end of collimater 6 is used for the light letter for connecting (FBG) demodulator 4
Signal communication end, the (FBG) demodulator communication interface of the electrical signal communication end connection computer 2 of (FBG) demodulator 4.
In above-mentioned technical proposal, the bragg grating ripple deflection device 3 is sensed by adjusting bragg grating
The temperature and/or stress of array 8 and/or strain realize that the bragg grating of bragg grating sensor array 8 produces
Wavelength shift.
In above-mentioned technical proposal, the bragg grating sensor array 8 is entirely with FBG arrays or non-entirely with FBG gusts
Row.Here the non-repetitive cycling array for referring to several centre wavelength FBG with FBG arrays generation entirely.It is entirely each with FBG arrays
The centre wavelength of grating is identical.
In above-mentioned technical proposal, bragg grating ripple deflection device 3 is controlled by microcontroller 1, and wave length shift value can be with
Set, the centre wavelength of FBG and the centre wavelength of other FBG is not completely overlapping in order to make after drift, its wavelength shift value is
500pm~800pm；Bragg grating labelling apparatus 7 is controlled by microcontroller 1, by spraying oily ink pair to FBG
FBG makes marks, and oily ink has two kinds of colors, the color marked respectively according to the injection of the handling result automatic decision of computer 2,
It is up-to-standard and underproof spray different inks respectively.
A kind of to lock demodulation method one by one using the fiber grating of said system, it includes the following steps：
Step 1：2 control single chip computer 1 of computer, so as to control bragg grating ripple deflection device 3 to set Prague light
The bragg grating wavelength shift value of fine grating sensing array 8, and make the wavelength of bragg grating by the deviant
Offset, (FBG) demodulator 4 obtain bragg grating wavelength shift value by network interface from computer 2, and (FBG) demodulator 4 passes through the Prague
The scanning wavelength scope of optic fiber grating wavelength deviant adjustment 4 inner scanning light source of (FBG) demodulator and sweep spacing, wherein, scan ripple
Long scope needs to include the centre wavelength of bragg grating, and sweep spacing is predetermined interval；
Step 2：Open traction wheel 5 so that traction wheel 5 starts to draw raster manipulation online, quartz pushrod is formed cloth
Glug optical fibre optical grating sensing array 8, during drawing raster manipulation online, according to each in bragg grating sensor array 8
A grating apart from (FBG) demodulator 4 position modulation (FBG) demodulator scan frequency, so as to ensure to include Prague in 4 acquisition range of (FBG) demodulator
The otdr signal of each grating in optical fibre optical grating sensing array 8；
Step 3：(FBG) demodulator 4 exports the narrowband optical signal in the range of scanning wavelength, and the narrowband optical signal is modulated into light
Output of pulse signal, light pulse signal is by entering bragg grating sensor array 8 after collimater 6；
Step 4：Filled partially when each grating in bragg grating sensor array 8 is drawn to bragg grating ripple
When putting 3 correspondence position, bragg grating ripple deflection device 3 causes corresponding grating in bragg grating sensor array 8
Centre wavelength drift about, make the wavelength of the grating from bragg grating sensor array overlapping wavelengths area deviate one section away from
From reaching in wavelength domain as it can be seen that as shown in Fig. 2, (FBG) demodulator is to the reflectance spectrum of the grating in bragg grating sensor array 8
Duan Jinhang is locked, and the light pulse signal is scanned in the reflection spectral coverage region of the grating；
Step 5：(FBG) demodulator 4 gathers the time domain letter that light pulse signal is reflected back in bragg grating sensor array 8
Number, and reflectance spectrum is spliced into according to the time-domain signal being reflected back, further according to reflectance spectrum and OTDR principles to bragg fiber
Current 3 corresponding grating of bragg grating ripple deflection device in grating sensing array 8 is positioned；
Step 6：The reflectance spectrum of above-mentioned grating after positioning is demodulated, light is carried out to the reflectance spectrum after demodulation
Gate signal quality evaluation (assessing the centre wavelength, intensity and secondary lobe of grating signal) is handled, you can determines corresponding grating
Mass parameter, computer 2 determines whether above-mentioned grating qualified according to above-mentioned mass parameter；
Step 7：With the traction of traction wheel 5, which further moves, and works as Prague
When the above-mentioned grating of quality examination had already passed through in optical fibre optical grating sensing array 8 moving to marker bit, bragg grating mark
Remember grating that device 7 is determined according to computer 2 it is whether qualified as a result, carrying out quality status stamp to the grating.
Quality mark is carried out to all gratings in bragg grating sensor array 8 by the method for step 4~step 7
Note.FBG is after heating unit, its temperature is gradually reduced in moving process, its final corresponding centre wavelength will be equal to and add
Corresponding centre wavelength before heat, and the other FBG centre wavelengths of FBG arrays are equal.
In above-mentioned technical proposal, during quartz pushrod is formed bragg grating sensor array 8, with
The increase of grating number, the scope that (FBG) demodulator 4 monitors change therewith, position of the (FBG) demodulator 4 to the fiber grating newly inscribed, spectrum
And wavelength information is monitored demodulation.
In above-mentioned technical proposal, in the step 4, bragg grating ripple deflection device 3 is by adjusting bragg fiber
The temperature and/or stress of grating sensing array 8 and/or strain so that corresponding grating in bragg grating sensor array 8
Centre wavelength drift about.
In above-mentioned technical proposal, the sweep spacing is 20pm.Scanning wavelength scope will be according to the raster center detected
Wavelength determines that scanning wavelength scope should include the centre wavelength after archicenter wavelength and wavelength shift, such as
The grating of 1550nm, ripple deflection device cause off-centre 500pm, which is changed into 1550.5nm, then scanning wavelength
Scope should include 1550~1550.5nm.
Invention adjusts the parameters such as temperature or the stress and strain of fiber grating by ripple deflection device, makes newly to inscribe to be measured
The shadow region that all optical grating reflection wavelength are covered before optical grating reflection wavelength departs from, reaches independently visible in wavelength domain；Root again
According to the grating spectrum centre wavelength to be measured and spectrum width after offset so that light source is only in the narrower range for covering grating spectrum to be measured
Scanning, while realized on demodulating algorithm according to the change quick lock in grating present position of fiber lengths to selecting grating light
The quick positioning differentiated with spectral position of correlated characteristic is composed, so as to lock single fiber grating reflectance spectrum and it is quickly solved
Adjust；Microcontroller carries out respective markers according to the grating quality parameter obtained after demodulation, control labelling apparatus to grating.Present invention solution
Determine and limited by transmission loss and spectrum shade and the technology that be monitored on-line of grating quality can not be inscribed to continuous production
Problem, can realize and be demodulated and carry out respective markers to inscribed high-capacity optical fiber grating array one by one, so as to even
Continuous on-line monitoring inscribes the quality of grating, has demodulation speed is fast, power system capacity is big, stability is good, apparatus structure is simple etc.
Feature.
The content that this specification is not described in detail belongs to the prior art known to professional and technical personnel in the field.
Claims (9)
1. a kind of fiber grating based on wavelength shift locks demodulating system one by one, it is characterised in that：It include microcontroller (1),
Bragg grating ripple deflection device (3), bragg grating labelling apparatus (7), traction wheel (5), collimater (6), demodulation
Instrument (4) and computer (2), wherein, the data communication end connection of the data communication end connection microcontroller (1) of computer (2), monolithic
The control letter of the inclined control signal output connection bragg grating ripple deflection device (3) of bragg grating ripple of machine (1)
Number input terminal, the bragg grating marking of control signal output part connection bragg grating mark dress of microcontroller (1)
The signal input part of (7) is put, bragg grating ripple deflection device (3) is used to make bragg grating sensor array (8)
Bragg grating generation wavelength deviates, and bragg grating labelling apparatus (7) is used to sense bragg grating
The bragg grating inscribed in array (8) is marked；
The traction wheel (5) is used to quartz pushrod draw online to form bragg grating sensor array (8), collimater
(6) one end is used for the initiating terminal for accessing bragg grating sensor array (8), and the other end of collimater (6) is used to connect
The optical signal communications end of (FBG) demodulator (4), the (FBG) demodulator communication interface of the electrical signal communication end connection computer (2) of (FBG) demodulator (4).
2. the fiber grating according to claim 1 based on wavelength shift locks demodulating system one by one, it is characterised in that：Institute
Bragg grating ripple deflection device (3) is stated by adjusting the temperature and/or stress of bragg grating sensor array (8)
And/or the bragg grating generation wavelength offset of bragg grating sensor array (8) is realized in strain.
3. the fiber grating according to claim 1 based on wavelength shift locks demodulating system one by one, it is characterised in that：Institute
It is entirely with FBG arrays or non-entirely with FBG arrays to state bragg grating sensor array (8).
4. a kind of fiber grating using system described in claim 1 locks demodulation method one by one, it is characterised in that it is included such as
Lower step：
Step 1：Computer (2) control single chip computer (1), so as to control bragg grating ripple deflection device (3) to set Prague
The bragg grating wavelength shift value of optical fibre optical grating sensing array (8), and make the wavelength of bragg grating inclined by this
Shifting value deviates, and (FBG) demodulator (4) obtains bragg grating wavelength shift value from computer (2), and (FBG) demodulator (4) passes through the Bradley
The scanning wavelength scope of lattice optic fiber grating wavelength deviant adjustment (FBG) demodulator (4) inner scanning light source and sweep spacing, wherein, sweep
Retouching wave-length coverage needs to include the centre wavelength of bragg grating, and sweep spacing is predetermined interval；
Step 2：Open traction wheel (5) so that traction wheel (5) starts online drawing raster manipulation, quartz pushrod is formed cloth
Glug optical fibre optical grating sensing array (8), during drawing raster manipulation online, according to bragg grating sensor array (8)
In each grating apart from (FBG) demodulator (4) position modulation (FBG) demodulator scan frequency, so as to ensure bag in (FBG) demodulator (4) acquisition range
The otdr signal of each grating in sensor array containing bragg grating (8)；
Step 3：Narrowband optical signal in the range of (FBG) demodulator (4) output scanning wavelength, and the narrowband optical signal is modulated into light arteries and veins
Signal output is rushed, light pulse signal enters bragg grating sensor array (8) afterwards by collimater (6)；
Step 4：When each grating in bragg grating sensor array (8) is drawn to bragg grating ripple deflection device
(3) during correspondence position, bragg grating ripple deflection device (3) is so that corresponding in bragg grating sensor array (8)
The centre wavelength of grating is drifted about, and the wavelength of the grating is deviated one from bragg grating sensor array overlapping wavelengths area
Segment distance, reach in wavelength domain as it can be seen that (FBG) demodulator to the reflection spectral coverage of the grating in bragg grating sensor array (8) into
Row locking, the light pulse signal are scanned in the reflection spectral coverage region of the grating；
Step 5：The time domain letter that (FBG) demodulator (4) collection light pulse signal is reflected back in bragg grating sensor array (8)
Number, and reflectance spectrum is spliced into according to the time-domain signal being reflected back, further according to reflectance spectrum and OTDR principles to bragg fiber
The corresponding grating of current bragg grating ripple deflection device (3) in grating sensing array (8) is positioned；
Step 6：The reflectance spectrum of above-mentioned grating after positioning is demodulated, the reflectance spectrum after demodulation is believed into line raster
Number quality evaluation processing, you can determine the mass parameter of corresponding grating, computer (2) determines above-mentioned light according to above-mentioned mass parameter
Whether grid are qualified；
Step 7：With the traction of traction wheel (5), the bragg grating sensor array (8) is further mobile, works as Prague
When the above-mentioned grating of quality examination had already passed through in optical fibre optical grating sensing array (8) moving to marker bit, bragg grating
Grating that labelling apparatus (7) is determined according to computer (2) it is whether qualified as a result, carrying out quality status stamp to the grating.
5. fiber grating according to claim 4 locks demodulation method one by one, it is characterised in that：Pass through step 4~step 7
Method in bragg grating sensor array (8) all gratings carry out quality status stamp.
6. fiber grating according to claim 4 locks demodulation method one by one, it is characterised in that：Progressively make quartzy stick
During bragg grating sensor array (8), with the increase of grating number, the scope of (FBG) demodulator (4) monitoring with
Change, position, spectrum and the wavelength information of fiber grating of the (FBG) demodulator (4) to newly inscribing are monitored demodulation.
7. fiber grating according to claim 4 locks demodulation method one by one, it is characterised in that：In the step 4, Bradley
Lattice fiber grating ripple deflection device (3) by adjust bragg grating sensor array (8) temperature and/or stress and/or should
Become so that the centre wavelength of corresponding grating is drifted about in bragg grating sensor array (8).
8. fiber grating according to claim 4 locks demodulation method one by one, it is characterised in that：The scanning wavelength scope
Include the centre wavelength after fiber grating archicenter wavelength and wavelength shift.
9. fiber grating according to claim 4 locks demodulation method one by one, it is characterised in that：The sweep spacing is
20pm。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260904A (en) * | 2019-04-28 | 2019-09-20 | 武汉烽理光电技术有限公司 | The quality on-line automaticization detection method and system of large capacity grating array fibre optical sensor |
| CN111766046A (en) * | 2020-06-02 | 2020-10-13 | 武汉烽理光电技术有限公司 | Intelligent monitoring method and system for annealing aging of fiber Bragg grating |
| CN113670350A (en) * | 2020-05-15 | 2021-11-19 | 大连理工大学 | High-precision optical frequency domain reflection method, device and system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324447A (en) * | 2008-07-25 | 2008-12-17 | 北京交通大学 | Bragg grating sensing demodulation system based on CCD and long-period optical fiber grating |
| CN102914321A (en) * | 2012-10-15 | 2013-02-06 | 武汉理工大学 | Ultra-low fiber bragg grating sensing system and query method thereof |
| CN103557854A (en) * | 2013-11-06 | 2014-02-05 | 中北大学 | Novel gyroscope based on nanometer optical grating detection |
| CN104931081A (en) * | 2015-06-10 | 2015-09-23 | 天津大学 | Composite wavelength reference-based fiber bragg grating sensing demodulation device and method |
| CN105043458A (en) * | 2015-09-17 | 2015-11-11 | 山东大学 | Device and method for on-line detection of lightning damage of fiber composite material |
| CN205664921U (en) * | 2016-06-13 | 2016-10-26 | 山西省交通科学研究院 | Dynamic weighing system based on fiber grating sensing technology |
| CN206258396U (en) * | 2016-11-30 | 2017-06-16 | 广东溢达纺织有限公司 | Raster pattern cloth cover broken hole detection means |
-
2017
- 2017-11-23 CN CN201711180764.3A patent/CN107990926B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324447A (en) * | 2008-07-25 | 2008-12-17 | 北京交通大学 | Bragg grating sensing demodulation system based on CCD and long-period optical fiber grating |
| CN102914321A (en) * | 2012-10-15 | 2013-02-06 | 武汉理工大学 | Ultra-low fiber bragg grating sensing system and query method thereof |
| CN103557854A (en) * | 2013-11-06 | 2014-02-05 | 中北大学 | Novel gyroscope based on nanometer optical grating detection |
| CN104931081A (en) * | 2015-06-10 | 2015-09-23 | 天津大学 | Composite wavelength reference-based fiber bragg grating sensing demodulation device and method |
| CN105043458A (en) * | 2015-09-17 | 2015-11-11 | 山东大学 | Device and method for on-line detection of lightning damage of fiber composite material |
| CN205664921U (en) * | 2016-06-13 | 2016-10-26 | 山西省交通科学研究院 | Dynamic weighing system based on fiber grating sensing technology |
| CN206258396U (en) * | 2016-11-30 | 2017-06-16 | 广东溢达纺织有限公司 | Raster pattern cloth cover broken hole detection means |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260904A (en) * | 2019-04-28 | 2019-09-20 | 武汉烽理光电技术有限公司 | The quality on-line automaticization detection method and system of large capacity grating array fibre optical sensor |
| CN110260904B (en) * | 2019-04-28 | 2022-07-15 | 武汉烽理光电技术有限公司 | Quality online automatic detection method and system of large-capacity grating array optical fiber sensor |
| CN113670350A (en) * | 2020-05-15 | 2021-11-19 | 大连理工大学 | High-precision optical frequency domain reflection method, device and system |
| CN113670352A (en) * | 2020-05-15 | 2021-11-19 | 大连理工大学 | Low-cost quasi-distributed physical quantity measuring method, device and system |
| CN113670350B (en) * | 2020-05-15 | 2022-06-21 | 大连理工大学 | High-precision optical frequency domain reflection method, device and system |
| CN113670352B (en) * | 2020-05-15 | 2024-02-27 | 大连理工大学 | Low-cost quasi-distributed physical quantity measuring method, device and system |
| CN111766046A (en) * | 2020-06-02 | 2020-10-13 | 武汉烽理光电技术有限公司 | Intelligent monitoring method and system for annealing aging of fiber Bragg grating |
| CN114777822A (en) * | 2022-04-18 | 2022-07-22 | 南京大学 | Fiber grating array synchronous sensing system based on multi-wavelength tunable laser |
| CN114777822B (en) * | 2022-04-18 | 2024-03-19 | 南京大学 | Fiber bragg grating array synchronous sensing system based on multi-wavelength tunable laser |
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