CN209727053U - 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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- CN209727053U CN209727053U CN201920730084.2U CN201920730084U CN209727053U CN 209727053 U CN209727053 U CN 209727053U CN 201920730084 U CN201920730084 U CN 201920730084U CN 209727053 U CN209727053 U CN 209727053U
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Abstract
The utility model 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 utility model has many advantages, such as that simple, small in size production, high sensitivity, fringe visibility are good.
Description
Technical field
The utility model belongs to fibre optical sensor field, and in particular to one kind is based on twin-core fiber-photonic crystal fiber knot
The strain transducer of structure.
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, the purpose of this utility model is that proposing a kind of brilliant based on twin-core fiber-photon
The strain transducer of body optical fiber structure, the sensor use twin-core fiber-photonic crystals optical fiber structure, and sensor is made to have machinery
Intensity is high, small advantage is lost in fusion.
The utility model is achieved through the following technical solutions: a kind of to be answered based on twin-core fiber-photonic crystals optical fiber structure
Become sensor, by amplified spontaneous emission source (1), fixed station (2), optical fiber sensor head (3), mobile station (4) and spectroanalysis instrument
It forms (5)；It is characterized by: the optical fiber sensor head (3) be by twin-core fiber (7) and photonic crystal fiber (8) cascade and
At the first single mode optical fiber of one end welding (6) is connect by fixed station (2) fixation with amplified spontaneous emission source (1), and the other end is molten
It connects the second single mode optical fiber (9) and forms light-path with spectroanalysis instrument (5) connection by the way that mobile station (4) are fixed, pass through and observe spectrum
The available interference spectrum of movement with strain variation of analyzer (5), and with available after computer disposal, calculating and fitting
The emergent property of strain transducer.
Twin-core fiber (7) cladding diameter is 125 microns, and centre is twin-core structure, and the diameter of twin-core is respectively 2
Micron and 2.5 microns, twin-core apart from fiber optic hub axial line distance be 1 micron；The refractive index model for the core that diameter is 2 microns in twin-core
Enclosing is 1.4544-1.4599, and the ranges of indices of refraction for the core that diameter is 2.5 microns is 1.4540-1.4590, the covering of twin-core fiber
Ranges of indices of refraction 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 utility model is: input light will be transmitted in fiber cores and fibre cladding, fiber cores and covering
In two optical paths can optical fiber end generate interference.For mach zehnder interferometer, the resonant wavelength of M rank cladding mode can
To be simply written as:
Wherein It is the refractive index of fundamental mode and M rank cladding mode respectively.λm
It is resonant wavelength, L is the physical length of MZI.When applying axial strain, the length of MZI be will increase, can be with by the differential equation
The offset of resonant wavelength is represented, formula is as follows:
As can be seen that resonant wavelength drift is the linear function for applying strain.Meanwhile strain sensitivity is depended primarily on and is answered
The changes delta n of changeeff, induced by the development length of MZI, that is,In addition, strain will also generate the object of joints
Reason deformation, 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 utility model are: being passed for a kind of based on the strain of twin-core fiber-photonic crystals optical fiber structure
Sensor is studied, which has many advantages, such as low cost, highly sensitive, electromagnetism interference, the structure be by twin-core fiber,
Photonic crystal fiber cascade is formed by interference structure.New structure has better fringe visibility than ordinary construction, 0~
Within the scope of 4000 μ ε, the reachable -1.95pm/ μ ε of strain sensitivity.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, has very strong innovative and practical value, has good
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), the first single mode optical fiber of one end welding
(6) it is connect by fixed station (2) fixation with amplified spontaneous emission source (1), the second single mode optical fiber of other end welding (9) passes through shifting
Dynamic platform (4) are fixed and spectroanalysis instrument (5) connection forms light-path, become by the way that observation spectroanalysis instrument (5) is available with strain
Change and mobile 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, length are 45 millimeters of optical fiber, and the first single mode optical fiber of sensing head one end welding (6) is fixed by fixed station (2) and amplifies certainly
Radiating light source (1) connection is sent out, the second single mode optical fiber of other end welding (9) passes through mobile station (4) fixation and spectroanalysis instrument (5) even
It connects to form light-path, by the available interference spectrum with strain variation movement of observation spectroanalysis instrument (5), and uses computer
The emergent property of available strain transducer after processing, calculating and fitting.
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| CN201920730084.2U CN209727053U (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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| CN201920730084.2U CN209727053U (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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109990727A (en) * | 2019-05-21 | 2019-07-09 | 中国计量大学 | It is a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109990727A (en) * | 2019-05-21 | 2019-07-09 | 中国计量大学 | It is a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer |
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