CN110389111A - One kind being based on bimodulus core shift optical fiber interference type index sensor - Google Patents
One kind being based on bimodulus core shift optical fiber interference type index sensor Download PDFInfo
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- CN110389111A CN110389111A CN201910617654.1A CN201910617654A CN110389111A CN 110389111 A CN110389111 A CN 110389111A CN 201910617654 A CN201910617654 A CN 201910617654A CN 110389111 A CN110389111 A CN 110389111A
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/4133—Refractometers, e.g. differential
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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
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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Abstract
The present invention relates to one kind to be based on bimodulus core shift optical fiber interference type index sensor, belongs to technical field of optical fiber sensing.Sensor is connected in turn by light source, single mode optical fiber, bimodulus core shift optical fiber, single mode optical fiber, detector, the fibre core of bimodulus core shift optical fiber deviates cladding center, fibre core is exposed in air, core shift fiber core is connect by input terminal using dislocation welding skill with single mode optical fiber fibre core, and output end core shift optical fiber and the direct fibre core alignment of single mode optical fiber are welded.When light is from Single-Mode Fiber Coupling to core shift optical fiber, dislocation welding can excite basic mode and higher order mode in core shift, and stable space bimodulus interference occurs in core shift for two modes of excitation, and output single mode optical fiber can monitor the transmission spectrum of basic mode in bimodulus interference.When external environment variations in refractive index, output interference spectrum will drift about, and realize the sensing measurement of external environment refractive index.Inventive sensor production is simple, and device integration is high, and interference spectrum is pure, and high sensitivity has a extensive future.
Description
Technical field
The present invention relates to one kind to be based on bimodulus core shift optical fiber interference type index sensor, belongs to optical fiber sensing technology neck
Domain.
Background technique
Fibre optical sensor is with structure is simple, light-weight, size is small, light and handy softness, electromagnetism interference, electrical isolation, corrosion resistant
The advantages such as erosion, other fibre optical sensor high sensitivity, measuring speed is big, information capacity is big, suitable for various adverse circumstances
Measurement, makes its wide range of applications, is related to the numerous areas such as petrochemical industry, electric power, medicine, civil engineering.Fibre Optical Sensor
Device causes to transmit the loss of luminous intensity or the variation of resonance peak position by the microstrain of optical fiber structure, so as to be used to survey
The environment parameters such as amount temperature, humidity, strain, pressure.In fields of measurement such as temperature, humidity, refractive index, micro-nano fiber can use
And the sensing measurement interfered to realize the variations such as ambient temperature or refractive index in multimode fibre between multiple modes；It can also
To introduce microcellular structure to single mode or other special optical fibers, interfere core mode with cladding mode, to external environment
The variations such as refractive index carry out sensing measurement.It is extremely complex based on multiple-mode interfence and core model-covering Mode interference sensor transmissions spectrum,
It is unfavorable for practical application.Side throwing processing can also be carried out to optical fiber make fibre core is exposed to obtain stronger evanscent field in air and come pair
The variation of external environment measures.But the mechanical strength that similar processing can all destroy optical fiber makes it in practical applications
It is relatively difficult.
Based on traditional less fundamental mode optical fibre interferometric sensor due to thick covering, the change for perceiving extraneous refractive index is made it difficult to
Change, the type index sensor is rarely reported.On the one hand bimodulus core shift optical fiber is convenient for exciting the high-order mode in fibre core, and because
That bimodulus is interfered so that interference peaks are very pure, convenient for the modulation /demodulation of signal, through excessive erosion can make fibre core directly with sky
Gas contact is also conducive to the measurement changed to extraneous environment parameter, improves the sensitivity of device.
Summary of the invention
It is provided a kind of based on bimodulus core shift optical fiber interference type folding the purpose of the invention is to improve the sensitivity of device
Penetrate rate sensor.
The object of the present invention is achieved like this: including light source, the first single mode optical fiber, bimodulus core shift optical fiber, the second single mode
Optical fiber, detector；Light source, the first single mode optical fiber, bimodulus core shift optical fiber, the second single mode optical fiber, detector are sequentially connected, and bimodulus is inclined
The fibre core of core fibre is directly contacted with air.
The invention also includes structure features some in this way:
1, the bimodulus core shift fibre diameter is 125 microns, and fibre core is bimodulus, and 8-10 microns of diameter, fibre core deviates covering
Centre distance is greater than 30 microns, and core packet refringence is 0.006.
2, the bimodulus core shift optical fiber and input terminal single mode optical fiber are directly welded using lateral dislocation migration technology, and two
A single mode optical fiber fibre core misplaces 5 microns with the core shift fiber optic hub corroded, misplaces as radially outward side direction.
3, the bimodulus core shift optical fiber is aligned with the direct fibre core of output end single mode optical fiber and is welded.
4, the bimodulus core shift optical fiber corrodes by hydrofluoric acid, so that the fibre core of core shift optical fiber is directly contacted with air, it is rotten
Core shift fibre diameter after erosion is 78-82 microns, and core packet refringence is 0.006.
5, the fibre core of the bimodulus core shift optical fiber is located at clad boundary and directly directly contacts with air, outside the dual mode optical fiber
The coating warm humidity-sensitive material of the core shift of dew realizes temperature and humidity sensing measurement.
Compared with prior art, the beneficial effects of the present invention are: the present invention using the bimodulus core shift optical fiber corroded as
Sensing probe, bimodulus is interfered so that interference peaks are very pure, and convenient for modulating and demodulating signal, manufacture craft is simple, device integration
Height, core shift is exposed also to make it have extra high refractive index sensitivity in air.Single mode optical fiber and core shift optical fiber weld more
It is easy, and fibre strain is small, surface is smooth, and device Insertion Loss is small.Compared with micro-nano fiber or Holey optical fibres, the machinery of device is strong
Degree is greatly improved.Surface chemical modification and physically changed all very convenient, coating corresponding two dimension are carried out to exposed core shift
Material can realize the measurement of temperature and humidity or gas concentration.
Detailed description of the invention
Fig. 1 is uncorroded bimodulus core shift optical fiber and the core shift optical fiber structure figure that was corroded using hydrofluoric acid；
Fig. 2 is Surface Core bimodulus core shift optical fiber；
Fig. 3 is the bimodulus core shift optical fiber interference type index sensor schematic diagram corroded；
Fig. 4 is Surface Core optical fiber interference type index sensor schematic diagram；
Fig. 5 is based on the bimodulus core shift optical fiber interference type temperature sensor schematic diagram corroded；
Fig. 6 is the bimodulus core shift optical fiber interference type refractometry data corroded, transmission spectrum when (a) is variations in refractive index
Change curve is (b) refractive index sensitivity data.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing.
The present invention is to realize the measurement of refractive index based on mode-interference mechanism using a kind of bimodulus eccentric core fiber.It is inputting
End welded bimodulus eccentric core fiber and single mode optical fiber using lateral dislocation migration technology, not same order in excitation core shift optical fiber
Core model monitors interference spectrum in basic mode using single mode fibre in exit end.Since sensing unit bimodulus eccentric core fiber fibre core is exposed in sky
In gas, there is stronger evanscent field can make effective folding of interference pattern in core shift optical fiber when external environment variations in refractive index
Penetrating rate also can realize refractive index sensing measurement with changing.Compared to micro-nano fiber or other special construction optical fiber,
Production is simple, high sensitivity；With good mechanical strength, it is easy to interconnect with single mode optical fiber, device integration is high, interference spectrum
It is pure, while warm humidity-sensitive material can also be coated on the core shift of dual mode optical fiber, the temperature and humidity in environment is surveyed to realize
Amount.
The object of the present invention is achieved like this: one kind is by light based on bimodulus core shift optical fiber interference type index sensor
Source, single mode optical fiber 3, one sections of bimodulus core shift optical fiber 2, single mode optical fiber 3, detectors are connected in turn.2 diameter of bimodulus core shift optical fiber
It is 125 microns, fibre core 1 deviates cladding center distance and is greater than 30 μm.Core shift 1 be bimodulus, 8-10 microns of diameter.Bimodulus core shift optical fiber
2 directly welded with both ends single mode optical fiber 3 using lateral dislocation migration technology, is misplaced and is avoided wrapping for radially outward side direction
The excitation of layer mould, the position by adjusting dislocation welding make the energy coupling of single mode optical fiber into core shift and equivalent excitation in-core base
Mould and higher order mode.It is welded in output end core shift optical fiber and the direct fibre core alignment of single mode optical fiber, in exit end single mode fibre then
It can monitor the transmission spectrum of basic mode in stable bimodulus interference.The bimodulus core shift optical fiber passes through corrodes one section in hydrofluoric acid
Time, the covering for removing part enable core shift to be directly exposed to air；Or the fibre core of bimodulus core shift optical fiber is located at covering
Boundary is directly directly contacted with air.Exposed fibre core has stronger evanscent field, can directly interact with external environment, and
And exposed core shift can be coated related polymer or two-dimensional material with further progress surface chemistry or physical modification to complete
The sensing measurements such as temperature, gas concentration, humidity.One kind being based on bimodulus core shift optical fiber interference type index sensor, and work is former
Reason is to work as light source to inject from single mode optical fiber 3, is directly carried out two optical fiber using lateral dislocation migration technology in light source injection end
Welding, misplaces as radially outward side direction, makes in-core basic mode and the equivalent quilt of high-order mode by adjusting fiber core with single-mold transversal displacement
Excitation, stable space bimodulus interference occurs in core shift for two modes of excitation, in exit end core shift optical fiber 2 and single mode optical fiber
3 direct fibre core alignments are welded, and output single mode optical fiber can monitor the transmission spectrum of basic mode in bimodulus interference.The core shift corroded
When fiber core is directly exposed to air the refraction index changing with stronger evanscent field, around surface, basic mode and high-order
The effective refractive index of mode can change, and the optical path difference between Coherence Mode changes, therefore exporting interference spectrum will generation
Drift.Similar, after surface is coated corresponding two-dimensional material, when gas humidity and concentration change, interference peaks can also drift about,
Achieve the purpose that sensing.
Embodiment 1:
As shown in the picture, Fig. 1 is uncorroded bimodulus core shift optical fiber and the core shift optical fiber structure that was corroded using hydrofluoric acid
Figure；Fig. 3 is the bimodulus core shift optical fiber interference type index sensor schematic diagram corroded；Fig. 6 is the bimodulus core shift light corroded
Fiber interference type refractometry data, transmission spectrum change curve when (a) is variations in refractive index are (b) refractive index sensitivity data.
A kind of bimodulus core shift optical fiber interference type temperature sensor is the bimodulus core shift corroded by 3, one sections of light source, single mode optical fiber hydrofluoric acid
Optical fiber 2, single mode optical fiber 3, detector are connected in turn.The fibre core 1 of bimodulus core shift optical fiber 2 deviates 35 μm of cladding center.Corrosion
The core shift 1 crossed be bimodulus, 8-10 microns of diameter, core packet refringence 0.006.Core shift optical fiber is carried out first with hydrofluoric acid rotten
Erosion, corrosion makes fibre core after a certain period of time, and just in air, the core shift fibre diameter after corrosion is 78-82 microns for exposure.So
Afterwards in light source side, the bimodulus core shift optical fiber 2 and single mode optical fiber 3 corroded utilizes optical fiber bonding machine manual adjustment mode, makes list
Mode fiber fibre core misplaces about 5 microns with the core shift fiber optic hub that corroded, misplaces and avoids cladding mode for radially outward side direction
Excitation, from single mode optical fiber come out basic mode equivalent in bimodulus core shift optical fiber can inspire basic mode LP01 mould and higher order mode
Stable space bimodulus interference occurs in core shift for LP11 mould, two modes of excitation.It is in exit end that the bimodulus corroded is inclined
Core fibre 2 and single mode optical fiber 3 directly carry out fibre core alignment welding, and output single mode optical fiber can then monitor basic mode in bimodulus interference
Transmission spectrum.Due to being exposed to outer core shift there is biggish evanscent field to interfere mould in core shift when extraneous refractive index changes
The effective refractive index difference of formula will change, to make its interference peaks drift about, to realize the sensing of refractive index.Fig. 6
It is the measured data of experiment when sample is placed under different refractivity.As can be seen that the core shift optical fiber refractive index tool corroded
There is high sensitivity, as refractive index increases, interference spectrum drifts about to long wave, and near refractive index 1.4, refractive index sensitivity can
It is refractive index unit up to 2565.2nm/RIU, RIU.
Embodiment 2:
As shown in the picture, Fig. 2 is Surface Core bimodulus core shift optical fiber；Fig. 4 is Surface Core optical fiber interference type index sensor
Schematic diagram；Unlike the first embodiment, bimodulus core shift optical fiber is a surface core fibre, and fibre core is directly contacted with air and is not required to
Corroded.The higher order mode in Surface Core is set to be excited to generate interference, therefore using same dislocation welding technique
Directly the variation of ambient refractive index can be measured.
Embodiment 3:
As shown in the picture, Fig. 1 is uncorroded bimodulus core shift optical fiber and the core shift optical fiber structure that was corroded using hydrofluoric acid
Figure；Fig. 5 is based on the bimodulus core shift optical fiber interference type temperature sensor schematic diagram corroded；Unlike the first embodiment, in reality
On the basis of example 1, the aerial core shift surface of exposure is coated humidity-sensitive material, when the humidity variation in environment, will cause
The refractive index of humidity-sensitive material is changed, and then the sensing measurement to ambient humidity may be implemented.
To sum up, the present invention provides one kind to be based on bimodulus core shift optical fiber interference type index sensor, and sensor is by light
Source, single mode optical fiber, bimodulus core shift optical fiber, single mode optical fiber, detector are connected in turn.The fibre core of bimodulus core shift optical fiber deviates packet
Layer center, removing fiber section covering using corrosion technology keeps fibre core exposed in air.Dislocation welding skill is utilized in input terminal
Core shift fiber core is connect by art with single mode optical fiber fibre core, output end core shift optical fiber and the direct fibre core of single mode optical fiber be aligned into
Row welding.When light is from Single-Mode Fiber Coupling to core shift optical fiber, dislocation welding can excite basic mode and higher order mode in core shift,
Stable space bimodulus interference occurs in core shift for two modes of excitation, and output single mode optical fiber can monitor base in bimodulus interference
The transmission spectrum of mould.When external environment variations in refractive index, the effective refractive index of basic mode and higher order mode can change, output
Interference spectrum will drift about, and can realize the sensing measurement of external environment refractive index.The sensor production is simple, is easy to and list
Mode fiber interconnection, device integration is high, and interference spectrum is pure, and mechanical strength is big, which monitors and sense in ambient refractive index
Aspect will all be widely used.
Claims (7)
1. one kind is based on bimodulus core shift optical fiber interference type index sensor, it is characterised in that: including light source, the first single-mode optics
Fine, bimodulus core shift optical fiber, the second single mode optical fiber, detector；Light source, the first single mode optical fiber, bimodulus core shift optical fiber, the second single-mode optics
Fine, detector is sequentially connected, and the fibre core of bimodulus core shift optical fiber is directly contacted with air.
2. a kind of according to claim 1 be based on bimodulus core shift optical fiber interference type index sensor, it is characterised in that: described
Bimodulus core shift fibre diameter is 125 microns, and fibre core is bimodulus, and 8-10 microns of diameter, fibre core deviates cladding center distance and is greater than 30
Micron, core packet refringence are 0.006.
3. according to claim 1 or claim 2 a kind of based on bimodulus core shift optical fiber interference type index sensor, it is characterised in that:
The bimodulus core shift optical fiber is directly welded with input terminal single mode optical fiber using lateral dislocation migration technology, two single mode optical fibers
Fibre core misplace 5 microns with the core shift fiber optic hub that corroded, misplace as radially outward side direction.
4. according to claim 1 or claim 2 a kind of based on bimodulus core shift optical fiber interference type index sensor, it is characterised in that:
The bimodulus core shift optical fiber is aligned with the direct fibre core of output end single mode optical fiber and is welded.
5. a kind of according to claim 3 be based on bimodulus core shift optical fiber interference type index sensor, it is characterised in that: described
Bimodulus core shift optical fiber is aligned with the direct fibre core of output end single mode optical fiber and is welded.
6. a kind of according to claim 5 be based on bimodulus core shift optical fiber interference type index sensor, it is characterised in that: described
Bimodulus core shift optical fiber corrodes by hydrofluoric acid, so that the fibre core of core shift optical fiber is directly contacted with air, the core shift optical fiber after corrosion
Diameter is 78-82 microns, and core packet refringence is 0.006.
7. a kind of according to claim 6 be based on bimodulus core shift optical fiber interference type index sensor, it is characterised in that: described
The fibre core of bimodulus core shift optical fiber is located at clad boundary and directly directly contacts with air, and the exposed core shift of dual mode optical fiber is coated warm and humid quick
Material realizes temperature and humidity sensing measurement.
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Cited By (4)
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| CN111289021A (en) * | 2020-03-16 | 2020-06-16 | 中天科技光纤有限公司 | Optical fiber sensing device and detection system |
| CN112859237A (en) * | 2021-01-05 | 2021-05-28 | 武汉华之洋科技有限公司 | Composite detection device based on multi-core optical fiber sensor |
| CN113533255A (en) * | 2021-07-27 | 2021-10-22 | 广东海洋大学 | Refractive index sensor and system |
| CN115615921A (en) * | 2022-10-13 | 2023-01-17 | 哈尔滨工程大学 | Compact all-fiber speckle spectrometer based on microstructure multimode fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111289021A (en) * | 2020-03-16 | 2020-06-16 | 中天科技光纤有限公司 | Optical fiber sensing device and detection system |
| CN112859237A (en) * | 2021-01-05 | 2021-05-28 | 武汉华之洋科技有限公司 | Composite detection device based on multi-core optical fiber sensor |
| CN112859237B (en) * | 2021-01-05 | 2022-06-24 | 武汉华之洋科技有限公司 | Composite detection device based on multi-core optical fiber sensor |
| CN113533255A (en) * | 2021-07-27 | 2021-10-22 | 广东海洋大学 | Refractive index sensor and system |
| CN113533255B (en) * | 2021-07-27 | 2022-06-14 | 广东海洋大学 | Refractive index sensor and system |
| CN115615921A (en) * | 2022-10-13 | 2023-01-17 | 哈尔滨工程大学 | Compact all-fiber speckle spectrometer based on microstructure multimode fiber |
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Application publication date: 20191029 |