CN105954231B - A kind of hole based on Mode Coupling mechanism helps twin-core fiber sensor - Google Patents
A kind of hole based on Mode Coupling mechanism helps twin-core fiber sensor Download PDFInfo
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- CN105954231B CN105954231B CN201610265797.7A CN201610265797A CN105954231B CN 105954231 B CN105954231 B CN 105954231B CN 201610265797 A CN201610265797 A CN 201610265797A CN 105954231 B CN105954231 B CN 105954231B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
Abstract
The invention belongs to technical field of optical fiber sensing, more particularly to a kind of hole based on Mode Coupling mechanism for sensing measurements such as external environment refractive index, gas concentrations helps twin-core fiber sensor.Sensor is to help twin-core fiber, single mode optical fiber, detector to be connected in turn by light source, single mode optical fiber, one section of hole with large diameter air hole；Hole helps twin-core fiber covering side there are one large scale airport, and a fibre core of optical fiber is located at the center of covering, and another fibre core is located at air hole inwall and the position nearest apart from previous fibre core.The present invention helps twin-core fiber as sensing probe part using hole, since hole helps twin-core fiber to have large scale airport, eccentric fibre core is easy to expose, processing cost is low, manufacture craft is simple, and the isolation of airport makes exposed fibre core surface not be damaged, and surface is smooth, device Insertion Loss is small, and surface chemical modification and physically changed all very convenient is carried out to exposed eccentric fibre core.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, more particularly to a kind of for external environment refractive index, gas concentration etc.
The hole based on Mode Coupling mechanism of sensing measurement helps twin-core fiber sensor.
Background technology
Optical fibre sensor structure is simple, light-weight, size is small, light and handy softness.It can be with measurement structure overhead with an optical fiber
Between multiple spot or unlimited multivariant parameter；In conjunction with time division multiplexing and wavelength-division multiplex technique, it is very suitable as distributed biography
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 spot.
With the continuous development of optical fiber technology, various new structure optical fiber also continue to bring out.In order to solve to reduce optical fiber light
The manufacturing cost of cable proposed multi-core optical fiber with this two hang-up of exploitation high density high fiber count cable, S.Inao in 1979
Concept.For multi-core optical fiber sensor due to small, compact-sized, constituent material is consistent, and coefficient of thermal expansion is identical, shows temperature
Response out is cross sensitivity problem that is the same, thus can be avoided temperature and other physical quantitys, has from temperature and mends
Many advantages such as repay.So causing the extensive concern of people using multi-core optical fiber as the research of sensing element.
Twin-core fiber is the simplest multi-core optical fiber of structure.Directional coupler, multiplexing/solution may be implemented using twin-core fiber
Multiplexer, twin-core fiber wave splitting/composing device, filter, sensor etc..The twin-core fiber of common meaning, it is parallel by two
Fibre core and surround the two fibre cores public covering composition without airport auxiliary solid core fibres.If wanting to make a fibre core naked
Expose, then needs that chemical attack or laser micro-machining technology, when making is utilized to need to accurately control etching time or laser energy
Amount, fibre core are easy to be damaged.Finished fibre core surface quality it is difficult to ensure that, Insertion Loss is larger, it is difficult to carry out again at surface 2 times
Reason.
The present invention is to help twin-core fiber based on the measurement of Mode Coupling mechanism realization physical quantity with a kind of hole.Due to Kong Zhushuan
There is core fibre large scale airport, eccentric fibre core to be easy to expose.Thus fibre core surface is unaffected, device Insertion Loss
It is small, surface chemical modification and physically changed all very convenient is carried out to exposed eccentric fibre core.
Invention content
The purpose of the present invention is to provide a kind of holes based on Mode Coupling to help twin-core fiber sensor.
The object of the present invention is achieved like this：
A kind of hole based on Mode Coupling mechanism helps twin-core fiber sensor, sensor be by light source, single mode optical fiber, one section
Hole with large diameter air hole helps twin-core fiber, single mode optical fiber, detector to be connected in turn；Hole helps twin-core fiber covering
There are one large scale airport, a fibre core of optical fiber is located at the center of covering for side, another fibre core be located at air hole inwall and
The position nearest apart from previous fibre core.
It is single mode that the hole, which helps two fibre cores of twin-core fiber, and refractive index is identical, during the diameter of eccentric fibre core is more than
Heart core diameter；Distance is less than 20 microns between two fibre cores, 30-50 microns of air bore dia.
The connection of the light source side single mode optical fiber and twin-core fiber is to utilize single mode optical fiber fibre core and twin-core fiber position
It is directly aligned in the fibre core of cladding center and carries out welding realization.
The connection of the detector side single mode optical fiber and twin-core fiber is that single mode optical fiber fibre core is located at twin-core fiber
The directly alignment of the fibre core of cladding center carry out welding realization or single mode optical fiber fibre core be aligned with twin-core fiber bias fibre core into
Row welding is realized.
The hole helps the eccentric fibre core of twin-core fiber to be exposed to the external world using the method for chemical attack.
The hole helps the eccentric fibre core of twin-core fiber to be exposed to the external world using laser micro-machining technology.
The eccentric fibre core carries out surface chemical modification.
The extraneous method that eccentric fibre core is exposed to constitutes microchannel device.
The beneficial effects of the present invention are：
1, help twin-core fiber as sensing probe part using hole, since hole helps twin-core fiber to have large scale airport,
Eccentric fibre core is easy to expose, and processing cost is low, and manufacture craft is simple, and the isolation of airport makes exposed fibre core surface not
It is damaged, surface is smooth, and device Insertion Loss is small, and surface chemical modification and physically changed all very square is carried out to exposed eccentric fibre core
Just.
2, help twin-core fiber that can very easily constitute microchannel using hole, device integration is high.
Description of the drawings
Fig. 1 is that hole helps twin-core fiber structure chart；
Fig. 2 a are the twin-core fiber cross-sectional views of eccentric fibre core exposing after chemical attack；
Fig. 2 b are the twin-core fiber cross-sectional views for being exposed eccentric fibre core using laser micro-machining technology；
Fig. 2 c are the twin-core fiber cross-sectional views for being exposed eccentric fibre core using laser micro-machining technology；
Fig. 3 is that the hole based on Mode Coupling mechanism helps twin-core fiber sensor schematic；
Fig. 4 is that the hole based on Mode Coupling mechanism helps twin-core fiber index sensor schematic diagram；
Fig. 5 is that detector side single mode optical fiber carries out welding schematic diagram with twin-core fiber bias fibre core；
Fig. 6 is the sensor schematic for having microchannel；
Fig. 7 a are the twin-core fiber energy profiles calculated；
Fig. 7 b be calculate two fibre cores of twin-core fiber in energy with transmission range variation.
Specific implementation mode
It illustrates below in conjunction with the accompanying drawings and the present invention is described in more detail：
Help twin-core fiber sensor the present invention provides a kind of hole based on Mode Coupling mechanism, sensor be by light source,
Single mode optical fiber, one section of hole with large diameter air hole help twin-core fiber, single mode optical fiber, detector to be connected in turn.Hole helps
There are one large scale airport, a fibre cores of optical fiber to be located at cladding center, another fibre core position for certain side of twin-core fiber covering
In air hole inwall and the position nearest apart from previous fibre core.When two fibre cores are apart from relatively close and size is where appropriate, two fibres
Pattern in core can be mutually matched, and the light transmitted in a fibre core can be coupled to another fibre core.When external environment becomes
When change, coupling ratio will change, and corresponding spectrum will also change, and the survey of external physical quantity may be implemented using this feature
Amount.Due to the presence of eccentric airport, corrosion or laser micro-machining technology can be utilized very easily to expose fibre core, into
And realize refractive index sensing and micro-fluidic chip.To exposed eccentric fibre core carry out surface chemical modification and it is physically changed also very
It is convenient.The sensor production is simple, is easy to interconnect with single mode optical fiber, high sensitivity, and in a waveguide because of two fibre cores, device
Part integrated level is high, has temperature compensation capability.The device will all have widely in terms of the sensings such as solution or gas concentration, bending
Using.
It is to have major diameter by light source, 6, one sections of single mode optical fiber that a kind of hole based on Mode Coupling, which helps twin-core fiber sensor,
The hole of airport helps twin-core fiber 5, single mode optical fiber 6, detector to be connected in turn.Hole helps the side of twin-core fiber covering 4 to have
One large scale airport 3, a fibre core 1 of optical fiber 5 are located at the center of covering 4, another fibre core 2 be located at air hole inwall and away from
The position nearest from previous fibre core.It is single mode, two fiber core refractive index phases that hole, which helps two fibre cores 1 and 2 of twin-core fiber 5,
Together.To ensure that two core mode matchings, the size of eccentric fibre core 2 are more than the size of central core 1.Distance is small between two fibre cores
In 20 microns, 30-50 microns of air bore dia.The connection of light source side single mode optical fiber 6 and twin-core fiber 5 is by single mode optical fiber fibre core
It is directly aligned with twin-core fiber central core 1 and carries out welding realization.The connection of detector side single mode optical fiber 6 and twin-core fiber 5,
It can be that single mode optical fiber fibre core is directly aligned with twin-core fiber central core 1 and is welded, can also be by single mode optical fiber fibre core
It is aligned and is welded with twin-core fiber bias fibre core 2.Hole helps the eccentric fibre core 2 of twin-core fiber that can utilize chemical attack or laser
Fibre core 2 is exposed to the external world by micro-processing technology in airport side processing microflute 7, and exposed eccentric fibre core can be carried out further
Surface chemical modification.Two slots 8, liquid or gas can be opened using chemical attack or laser micro-machining technology in airport side
Access is constituted by two slots 8, and then constitutes microchannel device.Hole based on Mode Coupling helps twin-core fiber sensor,
Operation principle is to work as light source to inject from single mode optical fiber 5, is coupled directly into hole and helps twin-core fiber fibre core 1.When the pattern of two fibre cores
Propagation constant is identical, and two patterns are mutually matched.When two fibre core distances are closer, by the transmission of a distance, a fibre core
In energy will be coupled to another fibre core.Therefore when hole helps two core modes of twin-core fiber to be mutually matched, in fibre core 1
Energy transmission a distance will be coupled to fibre core 2, recently enter single mode fibre and enter detector.External environment changes, and visits
Surveying the energy that device receives will also change, and then realize the sensing measurement of physical quantity.
Embodiment 1：
In conjunction with Fig. 1, Fig. 2 (a), Fig. 3-4 and Fig. 7, the diameter of fibre core 1 and 2 is respectively 8.1 and 12 microns, and wavelength 1.5 is micro-
Rice, a kind of hole based on Mode Coupling help twin-core fiber index sensor be had by light source, 6, one sections of single mode optical fiber it is big straight
The hole of diameter airport helps twin-core fiber 5, single mode optical fiber 6, detector to be connected in turn.Hole helps a fibre core 1 of twin-core fiber 5
Positioned at the center of covering 4, fibre cladding 4 is there are one large scale airport 3, before another fibre core 2 is located at air hole inwall and distance
The nearest position of one fibre core.It is matched for Assured Mode, the refractive index of fibre core 1 and 2 is 1.444, and diameter is respectively 8.1 and 12
Micron, core packet refringence 0.005.13 microns of distance between two fibre cores, 46 microns of air bore dia.Light source side single mode optical fiber
6 fibre core is directly aligned with twin-core fiber central core 1 and is welded.The fibre core of detector side single mode optical fiber 6 be also with it is double
The directly alignment of core fibre central core 1 is welded.Fibre diameter (Fig. 2 (a)) separately is thinned with hydrofluoric acid, corrosion cladding thickness is big
In 9.5 microns, core shift 2 can expose, and constitute microflute 7, corrosion length can be entire twin-core fiber length, can also be
Partial-length.If sensing unit is placed in saline solution, testing liquid can contact core shift, when the concentration of saline solution changes
When, liquid refractivity also changes, and the energy of output single mode fibre will change, and then realize refractive index sensing.Fig. 7 is 1.5
Energy coupling figure in the twin-core fiber fibre core calculated when micron.
Embodiment 2：
In conjunction with Fig. 1, Fig. 2 (b), Fig. 5, a kind of hole based on Mode Coupling helps twin-core fiber index sensor, with implementation
Unlike example 1, core shift 2 is to utilize high frequency CO2Laser in airport side cut exposed (Fig. 2 (b)).Detection
The fibre core of device side single mode optical fiber 6 is directly aligned with twin-core fiber bias fibre core 2 and is welded.
Embodiment 3：
In conjunction with Fig. 1, Fig. 2 (c) and Fig. 6, a kind of hole based on Mode Coupling helps twin-core fiber index sensor, with implementation
Unlike example 1, punching (Fig. 2 (c)) twice is carried out in airport side using femtosecond laser, eccentric fibre core 2 is exposed,
Two microflutes 8 are formed, and then constitute microchannel device.Liquid constitutes access by two slots 8, may be implemented to liquid, gas
The sensing measurements such as body.
Embodiment 4：
In conjunction with Fig. 1 and Fig. 3, it is by light source, single-mode optics that a kind of hole based on Mode Coupling, which helps twin-core fiber bending sensor,
Fine 6, one sections of holes with large diameter air hole help twin-core fiber 5, single mode optical fiber 6, detector to be connected in turn.Hole helps twin-core
One fibre core 1 of optical fiber 5 is located at the center of covering 4, and there are one large scale airport 3, another fibre cores 2 to be located at sky for fibre cladding 4
Stomata inner wall and the position nearest apart from previous fibre core.It being matched for Assured Mode, the refractive index of fibre core 1 and 2 is 1.444,
Diameter is respectively 8.1 and 12 microns, core packet refringence 0.005.13 microns of distance between two fibre cores, air bore dia 46 is micro-
Rice.Single mode optical fiber 6 fibre core in light source side is directly aligned with twin-core fiber central core 1 to be welded.Detector side single-mode optics
The fibre core of fibre 6 is also directly to be aligned to be welded with twin-core fiber central core 1.Light path when fibre-optical bending in two fibre cores
Change difference, make the energy of output single mode fibre that will change, and then realizes crooked sensory.
Claims (7)
1. a kind of hole based on Mode Coupling mechanism helps twin-core fiber sensor, it is characterized in that：Sensor is by light source, single-mode optics
Fine, one section of hole with large diameter air hole helps twin-core fiber, single mode optical fiber, detector to be connected in turn；Hole helps twin-core light
There are one large scale airport, a fibre cores of optical fiber to be located at the center of covering for fine covering side, and another fibre core is located at air
Hole inner wall and the position nearest apart from previous fibre core；
It is single mode that the hole, which helps two fibre cores of twin-core fiber, and refractive index is identical, and the diameter of eccentric fibre core is more than center fibre
Core diameter；Distance is less than 20 microns between two fibre cores, 30-50 microns of air bore dia.
2. a kind of hole based on Mode Coupling mechanism according to claim 1 helps twin-core fiber sensor, it is characterized in that：Institute
The connection of the light source side single mode optical fiber and twin-core fiber stated is to be located at cladding center with twin-core fiber using single mode optical fiber fibre core
Fibre core directly alignment carry out welding realization.
3. a kind of hole based on Mode Coupling mechanism according to claim 1 helps twin-core fiber sensor, it is characterized in that：Institute
The connection of the detector side single mode optical fiber and twin-core fiber stated is that single mode optical fiber fibre core is located at cladding center with twin-core fiber
Fibre core directly alignment carry out welding realization or single mode optical fiber fibre core be directed at twin-core fiber bias fibre core carry out weld reality
It is existing.
4. a kind of hole based on Mode Coupling mechanism according to claim 1 helps twin-core fiber sensor, it is characterized in that：Institute
The hole stated helps the eccentric fibre core of twin-core fiber to be exposed to the external world using the method for chemical attack.
5. a kind of hole based on Mode Coupling mechanism according to claim 1 helps twin-core fiber sensor, it is characterized in that：Institute
The hole stated helps the eccentric fibre core of twin-core fiber to be exposed to the external world using laser micro-machining technology.
6. the hole according to claim 1 based on Mode Coupling mechanism helps twin-core fiber sensor, it is characterized in that：Described
Eccentric fibre core carries out surface chemical modification.
7. the hole according to claim 1 based on Mode Coupling mechanism helps twin-core fiber sensor, it is characterized in that：It will be described
Eccentric fibre core be exposed to extraneous method and constitute microchannel device.
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| CN109752791A (en) * | 2017-11-03 | 2019-05-14 | 桂林电子科技大学 | A kind of twin-core fiber and preparation method of microchannel and light wave channel hybrid integrated |
| CN108191224A (en) * | 2017-12-29 | 2018-06-22 | 武汉长盈通光电技术有限公司 | A kind of multi-core optical fiber preparation method based on glass tube |
| CN108627187A (en) * | 2018-05-07 | 2018-10-09 | 哈尔滨工程大学 | The suspending core fiber interferometric sensor of coating redox graphene |
| CN108709569A (en) * | 2018-05-07 | 2018-10-26 | 哈尔滨工程大学 | Based on the suspension counter-bending sensor of core long-period fiber grating |
| CN108507977A (en) * | 2018-05-25 | 2018-09-07 | 哈尔滨工程大学 | A kind of hole based on grating auxiliary type Mode Coupling helps twin-core fiber sensor |
| CN108873165B (en) * | 2018-06-28 | 2020-05-15 | 哈尔滨工程大学 | Random polarization state synthesizer of double-core optical fiber based on super-structure surface integration |
| CN110260920A (en) * | 2019-06-26 | 2019-09-20 | 哈尔滨工程大学 | Temperature and refractive index dual sampling device based on directional coupler and long-period fiber grating |
| CN112747778A (en) * | 2019-10-29 | 2021-05-04 | 桂林电子科技大学 | Adjustable Mach-Zehnder interferometer based on thermo-optic effect |
| CN114111642B (en) * | 2021-11-16 | 2024-03-26 | 哈尔滨工程大学 | Double-air-hole three-core optical fiber bending sensor |
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