CN109990727A - It is a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer - Google Patents
It is a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer Download PDFInfo
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- CN109990727A CN109990727A CN201910423601.6A CN201910423601A CN109990727A CN 109990727 A CN109990727 A CN 109990727A CN 201910423601 A CN201910423601 A CN 201910423601A CN 109990727 A CN109990727 A CN 109990727A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 34
- 239000004038 photonic crystal Substances 0.000 title claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 43
- 230000002269 spontaneous effect Effects 0.000 claims abstract description 10
- 238000003466 welding Methods 0.000 claims abstract description 9
- 238000001228 spectrum Methods 0.000 claims abstract description 4
- 238000005253 cladding Methods 0.000 claims description 10
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 241000209094 Oryza Species 0.000 claims 2
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000001953 sensory effect Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Abstract
The invention discloses a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer, by amplified spontaneous emission source, fixed station, optical fiber sensor head, mobile station and spectroanalysis instrument composition, the optical fiber sensor head is cascaded by twin-core fiber and photonic crystal fiber, welding single mode optical fiber in one end is connect by the way that fixed station is fixed with amplified spontaneous emission source, other end welding single mode optical fiber connects to form light-path by the way that mobile station is fixed with spectroanalysis instrument, passes through the available interference spectrum with strain variation movement of observation spectroanalysis instrument.The invention has many advantages, such as that simple, small in size production, high sensitivity, fringe visibility are good.
Description
Technical field
The invention belongs to fibre optical sensor fields, and in particular to a kind of based on twin-core fiber-photonic crystals optical fiber structure
Strain transducer.
Background technique
Optical sensor because of particular advantages such as its is small in size, high resolution, electromagnetism interferences, be widely used in temperature,
The monitoring of the parameter sensings such as refractive index, magnetic field, humidity, strain.Wherein, application of the strain in bridge and building health detection
Play the role of vital.The Polychlorinated biphenyls sensing technology especially combined with functional material, at present in sensory field
It is widely used, and causes the extensive concern of people.For strain transducer, fibre optical sensor is easily achieved
Embedded, distributed measurement can play more in the application fields such as building structure health monitoring, bridge construction, geological prospecting
Big effect.
Traditionally there are many strain sizes that method can get structure, but mostly by the restriction of certain condition.Utilize electricity
The strain for hindering foil gauge measurement structure, can obtain the deformation of structure, but the measurement range of foil gauge is limited indirectly, become in macrobending
It is restricted in the measurement of shape, because it can not restore to the original state after excessive deformation, is less suitable for flush type measurement；And it is surveying
When measuring thin structure, the strain very little of body structure surface just seems relatively difficult with foil gauge measurement.Therefore, researchers propose
Measurement method based on fibre optical sensor, such as Sagnac ring, bragg grating, long-period fiber grating, Fabry-Perot
The methods of chamber, Brillouin scattering, Raman scattering.Current most commonly used fibre optic strain sensor, be usually used fiber grating,
The Techniques of wavelength detection of long-period fiber grating, these method systems are complicated, involve great expense, by external environment (such as temperature)
It is affected, it may appear that the problem of cross sensitivity.Therefore, the height that a kind of structure is simple, is not influenced by variation of ambient temperature is developed
Sensitivity fibre optic strain sensor has important application value.
Summary of the invention
In view of the deficiencies of the prior art, a kind of based on twin-core fiber-photonic crystal light it is an object of the invention to propose
The strain transducer of fine structure, the sensor use twin-core fiber-photonic crystals optical fiber structure, and sensor is made to have mechanical strength
Small advantage is lost in high, fusion.
The invention is realized by the following technical scheme: a kind of to be passed based on the strain of twin-core fiber-photonic crystals optical fiber structure
Sensor, by amplified spontaneous emission source (1), fixed station (2), optical fiber sensor head (3), mobile station (4) and spectroanalysis instrument composition
(5)；It is characterized by: the optical fiber sensor head (3) is cascaded by twin-core fiber (7) and photonic crystal fiber (8), one end
Welding single mode optical fiber (6) is connect by fixed station (2) fixation with amplified spontaneous emission source (1), other end welding single mode optical fiber
(9) light-path is formed with spectroanalysis instrument (5) connection by the way that mobile station (4) are fixed, it is available by observation spectroanalysis instrument (5)
The interference spectrum of movement with strain variation, and answered with available strain transducer after computer disposal, calculating and fitting
Become characteristic.
Twin-core fiber (7) cladding diameter is 125 microns, and centre is twin-core structure, and the diameter of twin-core is respectively 2 micro-
Rice and 2.5 microns, twin-core apart from fiber optic hub axial line distance be 1 micron；The ranges of indices of refraction for the core that diameter is 2 microns in twin-core
It is 1.4544-1.4599, the ranges of indices of refraction for the core that diameter is 2.5 microns is 1.4540-1.4590, the covering folding of twin-core fiber
Penetrating rate range is 1.4115-1.4539.
The photonic crystal fiber (8) is to be made of six layers of stomata, and core diameter is 10.1 microns, cladding diameter 125
The optical fiber of micron.
The transducing head structure is as made of single mode optical fiber-twin-core fiber-photonic crystal fiber-single mode optical fiber welding
Cascade structure, and twin-core fiber (7) and photonic crystal fiber (8) length are 45 millimeters.
The amplified spontaneous emission source (1) that the light source is 1528 nanometers -1602 nanometers of C+L wave band.
The working principle of the invention is: input light will be transmitted in fiber cores and fibre cladding, in fiber cores and covering
Two optical paths can generate interference in optical fiber end.For mach zehnder interferometer, the resonant wavelength of M rank cladding mode can letter
Singly it is written as:
WhereinIt is the refractive index of fundamental mode and M rank cladding mode respectively.λmIt is
Resonant wavelength, L are the physical lengths of MZI.When applying axial strain, the length of MZI be will increase, can be with table by the differential equation
The offset of resonant wavelength is shown, formula is as follows:
As can be seen that resonant wavelength drift is the linear function for applying strain.Meanwhile strain sensitivity depends primarily on strain
Changes delta neff, induced by the development length of MZI, that is,In addition, strain also becomes the physics for generating joints
Shape, therefore, output light intensity can change with the increase of strain.
When light wave is propagated in twin-core fiber, two fuses are symports, and what each fuse generated suddenly can be to another like field
One fuse has an impact, and during transmitting light, two fuses can interact, so that Power Exchange occurs between fuse, i.e.,
For the orientation misfit of mode, this directional couple can be applied to sensory field of optic fibre.Twin-core fiber given below is two
Fuse is parallel to each other and symmetrical structure.The distance between two fibre cores are denoted as d, and the area of section of two fibre cores is denoted as S1, S2 respectively,
The relative dielectric constant of two fibre cores is denoted as ε 1, ε 2 respectively, and the relative dielectric constant of covering is denoted as ε 3, wherein ε 1, ε 2, between ε 3
Meet relational expression min (ε 1, ε 2) > ε 3.The refractive index of two fibre cores is denoted as n1 and n2 respectively, and the refractive index of covering is denoted as n3；According to
The relationship of relative dielectric constant and refractive index has ε 1=n12, ε 2=n22, ε 3=n32 that can then release the folding of two fibre cores and covering
The rate difference of penetrating is respectively dn1 and dn2.The eigen mode of two fibre cores is expressed as E1(r)=E1(x, y) exp (- i β1And E z)2(r)=
E2(x, y) exp (- i β2Z) for when two fuses of twin-core fiber do not interfere other side, respective electric field is E1(r) and E2
(r).Two fuses, which can generate, in actual use influences each other, and couples.
The beneficial effects of the present invention are: for a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer
It is studied, which has many advantages, such as low cost, highly sensitive, electromagnetism interference, which is by twin-core fiber, photon
Crystal optical fibre cascade is formed by interference structure.New structure has better fringe visibility than ordinary construction, 0~4000
Within the scope of μ ε, the reachable -1.95pm/ μ ε of strain sensitivity.In addition, the sensor production is simple, strain measurement range is big, production
It is lost small, the development of pair of strain sensors has certain attraction, has very strong innovative and practical value, has good
Application prospect.
Detailed description of the invention
Fig. 1 is based on twin-core fiber-photonic crystals optical fiber structure strain transducer strain measurement experiment schematic device.
Fig. 2 is sensing arrangement schematic diagram.
Specific embodiment
As shown in Figure 1, it is a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer, by Amplified Spontaneous spoke
It penetrates light source (1), fixed station (2), optical fiber sensor head (3), mobile station (4) and spectroanalysis instrument (5) composition；It is characterized by: institute
Stating optical fiber sensor head (3) is cascaded by twin-core fiber (7) and photonic crystal fiber (8), and one end welding single mode optical fiber (6) is logical
It crosses fixed station (2) fixation to connect with amplified spontaneous emission source (1), other end welding single mode optical fiber (9) is solid by mobile station (4)
The connection of fixed and spectroanalysis instrument (5) forms light-path, available with strain variation movement by observation spectroanalysis instrument (5)
Interference spectrum, and with the emergent property of available strain transducer after computer disposal, calculating and fitting.
As shown in Fig. 2, described optical fiber sensor head (3) structure is one section of twin-core fiber of splicing between two single mode optical fibers
It is formed with photonic crystal fiber.Twin-core fiber-photonic crystals optical fiber structure MZI is fixed in two stages.One is fixed station, separately
One is mobile station.Meanwhile amplified spontaneous emission source and spectroanalysis instrument being connected, the change of real-time monitoring transmission spectrum
Change.When strain progressively increases to 4000 μ ε from 0, entire resonant wavelength is mobile to shorter wavelength direction.The experimental results showed that
The strain sensitivity of MZI and the resonant wavelength of cladding mode are close, and the wavelength of high-order cladding mode is more sensitive to additional strain.It is novel
Structure MZI has better fringe visibility than ordinary construction, within the scope of 0-4000 μ ε, strain sensitivity is reachable-
1.95pm/ μ ε, greater than the MZI based on taper PCF and PM-PCF.In addition, the sensor production is simple, strain measurement range is big,
Production loss is small, and the development of pair of strain sensors has certain attraction.
Claims (1)
1. it is a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer, by amplified spontaneous emission source (1), Gu
Determine platform (2), optical fiber sensor head (3), mobile station (4) and spectroanalysis instrument (5) composition；It is characterized by: the optical fiber sensor head
It (3) is to be cascaded by twin-core fiber (7) and photonic crystal fiber (8), the twin-core fiber (7) cladding diameter is 125 micro-
Rice, centre are twin-core structure, and the diameter of twin-core is respectively 2 microns and 2.5 microns, and twin-core fiber length is 45 millimeters, twin-core away from
It is 1 micron from fiber optic hub axial line distance；The ranges of indices of refraction for the core that diameter is 2 microns in twin-core is 1.4544-1.4599, directly
The ranges of indices of refraction for the core that diameter is 2.5 microns is 1.4540-1.4590, and the cladding index range of twin-core fiber is 1.4115-
1.4539；The photonic crystal fiber (8) is to be made of six layers of stomata, and core diameter is 10.1 microns, and cladding diameter is 125 micro-
Rice, the optical fiber that length is 45 millimeters, sensing head one end welding single mode optical fiber (6) pass through fixed station (2) fixation and Amplified Spontaneous spoke
Light source (1) connection is penetrated, other end welding single mode optical fiber (9) is fixed by mobile station (4) and spectroanalysis instrument (5) connection forms light
Access, by the available interference spectrum with strain variation movement of observation spectroanalysis instrument (5), and with computer disposal, count
The emergent property of available strain transducer after calculating and being fitted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910423601.6A CN109990727A (en) | 2019-05-21 | 2019-05-21 | It is a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer |
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| CN201910423601.6A CN109990727A (en) | 2019-05-21 | 2019-05-21 | It is a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer |
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|---|---|---|---|---|
| WO2007100924A1 (en) * | 2006-03-02 | 2007-09-07 | The Board Of Trustees Of The Leland Stanford Junior University | Multiple-core photonic-bandgap fiber with coupling between the cores |
| EP1939659A1 (en) * | 2006-12-26 | 2008-07-02 | Institut de Ciències Fotòniques, Fundació Privada | All-optical fiber interferometer |
| US20080239282A1 (en) * | 2006-10-20 | 2008-10-02 | Lufan Zou | Method and system for simultaneous measurement of strain and temperature |
| CN201181206Y (en) * | 2008-04-18 | 2009-01-14 | 中国科学院上海光学精密机械研究所 | Strain sensor based on porous microstructure optical fiber |
| CN202066638U (en) * | 2011-04-28 | 2011-12-07 | 浙江师范大学 | Apparatus realizing hydraulic sensing based on double-core and double-hole optical fiber |
| CN103148957A (en) * | 2013-03-04 | 2013-06-12 | 杭州电子科技大学 | Twin-core photonic crystal fiber-based interferometric temperature sensing method and device |
| US20140204456A1 (en) * | 2013-01-18 | 2014-07-24 | Np Photonics, Inc. | Ir supercontinuum source using low-loss heavy metal oxide glasses |
| WO2015163963A2 (en) * | 2014-02-10 | 2015-10-29 | University Of Central Florida Research Foundation, Inc. | Multicore optical fiber apparatus, methods, and applications |
| CN205262638U (en) * | 2015-12-10 | 2016-05-25 | 武汉工程大学 | A two core photonic crystal optical fiber sensor for being directed at temperature and simultaneous measurement of meeting an emergency |
| CN107121083A (en) * | 2017-06-23 | 2017-09-01 | 燕山大学 | A kind of asymmetric thick wimble structure less fundamental mode optical fibre strain transducer |
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-
2019
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|---|---|---|---|---|
| WO2007100924A1 (en) * | 2006-03-02 | 2007-09-07 | The Board Of Trustees Of The Leland Stanford Junior University | Multiple-core photonic-bandgap fiber with coupling between the cores |
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