CN108709569A - Based on the suspension counter-bending sensor of core long-period fiber grating - Google Patents
Based on the suspension counter-bending sensor of core long-period fiber grating Download PDFInfo
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- CN108709569A CN108709569A CN201810522735.9A CN201810522735A CN108709569A CN 108709569 A CN108709569 A CN 108709569A CN 201810522735 A CN201810522735 A CN 201810522735A CN 108709569 A CN108709569 A CN 108709569A
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- 239000000835 fiber Substances 0.000 title claims abstract description 122
- 238000005452 bending Methods 0.000 title claims abstract description 31
- 239000000725 suspension Substances 0.000 title claims abstract description 17
- 239000013307 optical fiber Substances 0.000 claims abstract description 37
- 238000003466 welding Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 12
- 238000000411 transmission spectrum Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 5
- 229910000679 solder Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002121 nanofiber Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—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
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention is to provide one kind based on the suspension counter-bending sensor of core long-period fiber grating.It is connected in turn by light source, the first section single-mould fiber, first segment suspending core fiber, second segment suspending core fiber, the second section single-mould fiber, detector, there are one the inner walls that large scale airport, fibre core hang on airport for the covering of the suspending core fiber, long-period fiber grating is carved on fibre core, the single mode optical fiber at the reversed 180 degree welding of two sections of suspending core fibers, suspending core fiber and both ends makes the energy of single mode optical fiber fibre core be all coupled in the fibre core of suspending core fiber using the directly welding of fibre core technique of alignment.Better bend performance can be achieved in the present invention；Since fibre core exposes to the open air in airport, when hole, inner stuffing matter is changed by external environment, grating transmission spectrum will change, and the measurement of external physical quantity may be implemented, and be immune to bending crosstalk；It makes simply, is easy to interconnect with single mode optical fiber, be widely used in terms of solution or the sensings such as gas concentration, counter-bending.
Description
Technical field
Being mainly used for immune external environment curvature the present invention relates to a kind of fibre optical sensor, especially one kind to intersect
The fibre optical sensor of the sensing measurements such as crosstalk.
Background technology
Optical fibre sensor structure is simple, light-weight, size is small, light and handy softness, can be with measurement structure overhead with an optical fiber
Between multiple spot or unlimited multivariant parameter be very suitable as distributed biography in conjunction with time division multiplexing and wavelength-division multiplex technique
Sensing unit embedding material and inside configuration are mounted on its surface realization multiple spot monitoring；Fibre optical sensor is because its many
Advantage and as structure monitoring and optical fiber technology research hot issue.And for fibre optical sensor, pass through optical fiber structure
Microstrain cause transmit luminous intensity loss or resonance peak position variation, so as to be used for measuring temperature, humidity, answer
The environment parameters such as change, pressure.In fields of measurement such as temperature, humidity, the compositions such as micro-nano fiber either fiber grating can be utilized
Fiber optic sensing device the variation of environment monitor and measure in real time.In flexural measurement field, long period optical fiber is utilized
The fiber optic sensing device that grating or bragg grating are constituted to bridge, road can measure and supervise in real time
Control.But it is intricate in the variation of many times external environment, it may be simultaneously present the several factors such as bending, temperature, humidity
Cross influence thus gives accurately measurement to bring larger difficulty.The intersection that measurement is brought in order to avoid bowing factor
It influencing, suspending core fiber sensor has larger airport, is easy to carry out good chemical modification to fibre core or material covers,
Simultaneously as itself has transverse property so as to realize the high-sensitivity measurement to external environments such as temperature, humidity, and it is immunized
Bending.But the unsymmetric structure of suspending core fiber can also introduce some small bending crosstalks, will influence to other physical quantitys reality
Now more accurately measure.So the research of bending resistance sensing element is still one of sensory field problem to be solved.
Invention content
The purpose of the present invention is to provide the immune bending crosstalk performance of one kind is good, make simply based on suspension core long period
The counter-bending sensor of fiber grating.
The object of the present invention is achieved like this：
Including light source, two section single-mould fibers, two sections of suspending core fibers and detector, light source, the first section single-mould fiber, first
Section suspending core fiber, second segment suspending core fiber, the second section single-mould fiber, detector are sequentially connected, the suspending core fiber
Covering is carved with long-period fiber grating, two sections outstanding there are one the inner wall that large scale airport, fibre core hang on airport on fibre core
It hangs the reversed 180 degree of core fibre to weld, the single mode optical fiber at suspending core fiber and both ends makes list using the directly welding of fibre core technique of alignment
The energy of mode fiber fibre core is all coupled in the fibre core of suspending core fiber.
The present invention can also include：
1, a diameter of 50-80 microns of the large scale airport.
2, the core diameter of suspending core fiber is 6-9 microns, is single mode optical fiber near infrared communication wave band, core shape is
Round or ellipse.
The present invention provides one kind based on the suspension counter-bending sensor of core long-period fiber grating.Suspending core fiber has big
Size air hole, is carved with long-period fiber grating on fibre core, and two sections of suspending core fibers carry out the welding of reversed 180 degree.Because
Welding has different bending directions different sensitivity in the same direction, and reversed welding can eliminate differently curved direction to bending
The influence of sensitivity, to realize bend performance.
It is by light source, the first single-mode optics that one kind of the present invention, which being based on the suspension counter-bending sensor of core long-period fiber grating,
It is fine, two sections be carved with the suspending core fiber of long-period fiber grating, the second section single-mould fiber, detector and be connected in turn.Suspension
There are one large scale airport, fibre cores to hang on the inner wall of airport for the covering of core fibre.The diameter of suspending core fiber airport
It it is 50-80 microns, 6-9 microns of core diameter is single mode optical fiber near infrared communication wave band, and core shape can be that circle also may be used
Think ellipse.Suspending core fiber is directly welded with both ends single mode optical fiber using fibre core technique of alignment, keeps single-mode optics long and slender
The energy of core is all coupled in suspension core.In order to offset the influence that differently curved directionality brings transducer sensitivity,
The reversed 180 degree welding of two sections of suspending core fibers, i.e. one section of suspending core fiber another section of suspending core fiber axial-rotation 180 degree relatively
Afterwards, the fibre core of two sections of optical fiber carries out center alignment welding.Two sections of suspending core fibers just form symmetrical structure, can thus eliminate
The influence that different directions bring sensitivity when being bent.Then CO is utilized on the suspension core at left and right sides of solder joint2Laser is carved
Write the long-period fiber grating of symmetric equal-length degree.Suspending core fiber weld airport does not deform upon, each section of suspension core light
All there is airport at fine both sides solder joint, forms microchannel, the filling of liquid or gas can be carried out.By hanging the length on core
Period optical fiber grating can carry out extraneous environmental change the measurement for the physical quantity for being immune to bending.Based on suspension core long period light
The fine counter-bending sensor of grating, operation principle are：When light source from single mode optical fiber inject, be coupled directly into suspending core fiber fibre
Core.It is coupled into single mode optical fiber by the long-period fiber grating on fibre core, the transmission spectrum of central core is due to long period optical fiber light
The presence of grid can be there are one resonance peak.When external environment from different directions to suspending core fiber generate bending when, grating it is reversed
Welding can eliminate the spectral drift that differently curved direction generates, to realize bend performance, and when ambient temperature or gas are dense
When the parameters such as degree change, transmission spectrum will change, to realize the sensing measurement for being immune to bending.
Compared with prior art, advantages of the present invention is：
1, it is being welded due to the reversed 180 degree welding of two sections of suspending core fibers using suspending core fiber as sensing probe part
All there is large scale airport at point, be easy to constitute microfluidic device, humidity, the gas concentration etc. of environment are measured.
2, the reversed welding of suspending core fiber enables the device to eliminate the influence in differently curved direction, exempts from so as to realize
Epidemic disease is in the measurement of other sensing characteristics such as temperature, the concentration of bending.
3, the fibre optical sensor optical fiber structure is complete, and device Insertion Loss is small, is also easy to interconnect with single mode optical fiber, high sensitivity,
Device integration is high, and immune electromagnetic interference.
Description of the drawings
Fig. 1 is suspending core fiber structure chart；
Fig. 2 is that suspending core fiber welds schematic diagram with single mode optical fiber；
Fig. 3 is based on the suspension counter-bending sensor schematic of core long-period fiber grating.
Specific implementation mode
It illustrates below and the present invention is described in more detail.
In conjunction with Fig. 1, Fig. 2 and Fig. 3, one kind is by light based on the suspension counter-bending index sensor of core long-period fiber grating
The suspending core fiber 4, single mode optical fiber 5, detector that long-period fiber grating 6 is carved in source, 5, two sections of single mode optical fiber be sequentially connected and
At.There are one large scale airport 2, the fibre cores 1 of suspending core fiber 4 to hang on the inner wall of airport 2 for fibre cladding 3.Hang core
A diameter of 125 microns of optical fiber, a diameter of 80 microns of suspending core fiber airport 2, core diameter is 8 microns, and core packing is penetrated
Rate difference is 0.004.In light source side, suspending core fiber 4 utilizes optical fiber bonding machine manual adjustment mode with single mode optical fiber 5, will hang
It hangs core fibre 4 and the alignment of 5 fibre core of single mode optical fiber is welded, utilize identical method by suspending core fiber 4 and list in exit end
Mode fiber 5 is welded.Simultaneously by another section of suspending core fiber axial-rotation 180 degree relatively of one section in two sections of suspending core fibers
Afterwards, the fibre core of two sections of optical fiber carries out center alignment welding, the i.e. reversed welding of 180 degree.It is hung after the welding is completed at two sections
Solder joint between core fibre nearby inscribes long-period fiber grating 6, and what long-period grating pair claimed is distributed in solder joint both sides, side
Single mode optical fiber connects light source, and other side single mode optical fiber connects spectrometer, and until the resonance peak extinction ratio of appearance is maximum, stopping grating being carved
It writes.Because welding has different bending directions different sensitivity in the same direction, and reversed welding just forms symmetrical structure
Influence of the differently curved direction to device sensitivity can be eliminated, can be achieved with transverse property in this way.When material refractive index is sent out in hole
When raw change, the resonance peak of output will drift about, and then realize resistant to bending refractive index sensing.
There are one large scale airports, the fibre core of optical fiber to be located in airport on the inside of the suspending core fiber covering of the present invention
Wall.Here two sections of suspending core fiber fibre cores are the welding of reversed 180 degree, are carved with long period optical fiber light pad is symmetrical
Grid.Because welding has different bending directions different sensitivity to fibre core in the same direction, and reversed welding is just formed symmetrically
Structure can eliminate influence of the differently curved direction to device sensitivity, while have the optical fiber itself of airport to have bending resistance special
Property, therefore the device can realize better bend performance.Since fibre core exposes to the open air in airport, when hole inner stuffing matter is by outer
When boundary's environment changes, grating transmission spectrum will change, and the measurement of external physical quantity may be implemented using this feature, and be immunized
In bending crosstalk.The sensor production is simple, is easy to interconnect with single mode optical fiber, in solution or the sensings such as gas concentration, counter-bending
Aspect will be widely used.
Claims (3)
1. one kind is based on the suspension counter-bending sensor of core long-period fiber grating, including light source, two section single-mould fibers, two sections of suspensions
Core fibre and detector, light source, the first section single-mould fiber, first segment suspending core fiber, second segment suspending core fiber, second segment list
Mode fiber, detector are sequentially connected, it is characterized in that：There are one large scale airport, fibre core are outstanding for the covering of the suspending core fiber
It is hung on the inner wall of airport, long-period fiber grating is carved on fibre core, core is hung in the reversed 180 degree welding of two sections of suspending core fibers
It is outstanding that optical fiber and the single mode optical fiber at both ends using the directly welding of fibre core technique of alignment make the energy of single mode optical fiber fibre core be all coupled to
In the fibre core for hanging core fibre.
2. it is according to claim 1 based on the suspension counter-bending sensor of core long-period fiber grating, it is characterized in that：It is described big
A diameter of 50-80 microns of size air hole.
3. it is according to claim 1 or 2 based on the suspension counter-bending sensor of core long-period fiber grating, it is characterized in that：It is outstanding
The core diameter for hanging core fibre is 6-9 microns, is single mode optical fiber near infrared communication wave band, core shape is round or oval
Shape.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810425294 | 2018-05-07 | ||
| CN2018104252940 | 2018-05-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108709569A true CN108709569A (en) | 2018-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810522735.9A Pending CN108709569A (en) | 2018-05-07 | 2018-05-28 | Based on the suspension counter-bending sensor of core long-period fiber grating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118539A (en) * | 2019-05-24 | 2019-08-13 | 西南交通大学 | A kind of optical fiber obliquity sensor overcoming temperature interference and method |
| CN112945284A (en) * | 2021-01-26 | 2021-06-11 | 广东海洋大学 | High-sensitivity high-temperature sensor based on suspension optical fiber dislocation welding |
| CN114088136A (en) * | 2021-11-16 | 2022-02-25 | 哈尔滨工程大学 | Temperature and humidity double-parameter sensor and preparation method and application thereof |
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| CN101914763A (en) * | 2010-07-20 | 2010-12-15 | 南昌大学 | Bending and twisting resistant protection method of long-period fiber grating sensor |
| CN103364102A (en) * | 2012-04-05 | 2013-10-23 | 电子科技大学 | Bending-resistant single-LPFG (Long Period Fiber Grating) sensor simultaneously measuring temperature and strain |
| CN105954235A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工程大学 | Hole-assisted dual-core optical fiber interferential refractive index sensor |
| CN105954231A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工程大学 | Hole-assisted dual-core optical fiber sensor based on mode coupling mechanism |
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2018
- 2018-05-28 CN CN201810522735.9A patent/CN108709569A/en active Pending
Patent Citations (4)
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| CN101914763A (en) * | 2010-07-20 | 2010-12-15 | 南昌大学 | Bending and twisting resistant protection method of long-period fiber grating sensor |
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| JING KONG,ET AL.: "Two-Axis Bending Sensor Based on Cascaded Eccentric Core Fiber Bragg Gratings", 《IEEE PHOTONICS TECHNOLOGY LETTERS》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118539A (en) * | 2019-05-24 | 2019-08-13 | 西南交通大学 | A kind of optical fiber obliquity sensor overcoming temperature interference and method |
| CN112945284A (en) * | 2021-01-26 | 2021-06-11 | 广东海洋大学 | High-sensitivity high-temperature sensor based on suspension optical fiber dislocation welding |
| CN112945284B (en) * | 2021-01-26 | 2021-09-21 | 广东海洋大学 | High-sensitivity high-temperature sensor based on suspension optical fiber dislocation welding |
| CN114088136A (en) * | 2021-11-16 | 2022-02-25 | 哈尔滨工程大学 | Temperature and humidity double-parameter sensor and preparation method and application thereof |
| CN114088136B (en) * | 2021-11-16 | 2024-03-26 | 哈尔滨工程大学 | Temperature and humidity double-parameter sensor and preparation method and application thereof |
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Application publication date: 20181026 |