CN207936923U - A kind of ethyl alcohol filling photonic crystal fiber bending sensor based on directional couple - Google Patents
A kind of ethyl alcohol filling photonic crystal fiber bending sensor based on directional couple Download PDFInfo
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- CN207936923U CN207936923U CN201820453287.7U CN201820453287U CN207936923U CN 207936923 U CN207936923 U CN 207936923U CN 201820453287 U CN201820453287 U CN 201820453287U CN 207936923 U CN207936923 U CN 207936923U
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Abstract
The utility model discloses a kind of ethyl alcohol filling photonic crystal fiber bending sensor based on directional couple, including sensor and the mating measuring device of sensor.The sensor introduces 4 defect cavities by the level (X-direction) in 5 layers of regular hexagon photonic crystal fiber with vertical direction (Y-direction), and ethyl alcohol is filled in defect cavity, realizes any direction crooked sensory of temperature-insensitive.According to coupled mode effect, Defect Modes can be formed by filling the defect cavity of ethyl alcohol, and directional couple effect occurs with basic mode and forms fundamental mode loss peak.When optical fiber is in horizontal or vertical bend, the Defect Modes of corresponding direction couple the loss peak to be formed with basic mode and will produce bimodal division, and more ironically, the curvature that the difference of bimodal drift is bent photonic crystal fiber is sensitive and to temperature-insensitive.By the way that any direction is bent Orthogonal Decomposition to horizontal vertical direction, any direction crooked sensory that temperature-compensating may be implemented in bimodal drift difference is measured.As a result it shows：X-direction is bent has respectively reached 3.212nm/m with the curvature sensitivity of Y-direction bending‑1And 4.086nm/m‑1.The sensor structure is simple and reliable, is simple to manufacture, high sensitivity, is suitable for multi-field realization crooked sensory.
Description
Technical field
The utility model is related to a kind of fibre optical sensor more particularly to a kind of ethyl alcohol filling photon based on directional couple are brilliant
Body optical fibre bending sensor.
Background technology
Photonic crystal fiber（PCF, Photonic Crystal Fibers）Become due to its unique control light characteristic
Outstanding sensing platform.Sensor based on PCF has many advantages, such as compact-sized, high sensitivity, anti-outside electromagnetic interference, in recent years
To be widely used.Deepening continuously and develop with PCF researchs, PCF sensors are widely used to temperature, magnetic
Various parameters detection in field, refractive index, curvature, stress distributed sensor-based system.For PCF crooked sensories, one is heavy
The temperature or stress variation that problem is adjoint in bending process are wanted, to influence the precision of crooked sensory.In addition bending direction and
Curvature is two key indexes of monitoring structural health conditions, but at present most bending sensors usually require it is true in bending direction
The measurement of curvature is carried out under conditions of fixed.It is therefore proposed that a kind of can measure bending direction and the bending sensor of curvature simultaneously
To be work more with practical value.
Invention content
The purpose of this utility model is to provide a kind of ethyl alcohol filling photonic crystal fiber crooked sensory based on directional couple
Device.The problem of being measured simultaneously with curvature for cross sensitivity in crooked sensory and bending direction proposes double using horizontal vertical
The method of channel directional couple realizes that the bending direction of temperature-insensitive measures simultaneously with curvature.This sensor has structure letter
The features such as single, easily fabricated, high sensitivity.
To realize that above-mentioned target, the technical solution of the utility model are as follows：
A kind of ethyl alcohol filling photonic crystal fiber bending sensor based on directional couple, it is characterised in that：Regular hexagon
The outer first layer of fibre core is macropore (5) in symmetrical airport, and vertical direction introduces defect cavity VD1 and VD2 (6), horizontal
Direction introduces defect cavity HD1 and HD2 (7), fills ethyl alcohol (8) inside four defect cavities, vertical direction defect cavity internal layer has
Adjustment hole (9)；It is made of light source part (1), coupling part (2), Sensor section (3), demodulation part (4), light source part is used
Wideband light source provides light source for entire sensor-based system, and coupling part includes Polarization Controller and single mode optical fiber, using single-mode optics
Wideband light source signal after polarization filtering is introduced sensor to fibre and modulated optical signal is passed to demodulation part, and Sensor section is used
In modulated optical signal, demodulation part is using spectrometer demodulation output through the modulated optical signal of sensor.
A kind of ethyl alcohol filling photonic crystal fiber bending sensor based on directional couple, it is characterised in that：Fibre core outer the
One layer of diameter macropores are 1.62 μm, and a diameter of 1.3 μm of airport, air pitch of holes is 2.5 μm, and defect cavity VD1 and VD2 is a diameter of
0.6 μm, HD1 and a diameter of 0.65 μm of HD2, a diameter of 0.5 μm of defect cavity adjustment hole；When temperature is 20 DEG C, the refraction of ethyl alcohol is taken
Rate is 1.36048.
A kind of ethyl alcohol filling photonic crystal fiber bending sensor based on directional couple, it is characterised in that：It is horizontal and vertical
Histogram will produce Defect Modes to defect cavity filling ethyl alcohol, can be generated with basic mode couple to generate fundamental mode loss peak, water respectively
Flat or vertical curvature effect can make its loss peak generated for direction Defect Modes and basic mode that bimodal division occur, and this is divided
Bimodal difference is linearly sensitive to bending curvature, and to temperature-insensitive.
Utility model works principle is as follows：
Because of directional couple effect, basic mode will produce loss with filling ethyl alcohol defect cavity basic mode under the conditions of meeting Wavelength matched
Peak can make the horizontal coupled wavelength with vertical direction defect cavity and basic mode be in different-waveband by structure design.Shadow by bending
It rings, fundamental mode loss summit is divided, and different directions bending influences difference, and two to horizontal vertical direction loss peak splitting degree
Division loss peak to peak value is insensitive and only sensitive to curvature to extraneous factors such as temperature.It can will be arbitrary by way of Orthogonal Decomposition
Bending direction is decomposed into two components in horizontal vertical direction, by the way that temperature can be achieved not to the measurement of two division loss peak to peak values
Sensitive any direction crooked sensory.
The beneficial effects of the utility model are：
The utility model realizes a kind of ethyl alcohol filling photonic crystal fiber bending sensor based on directional couple, can be with
It realizes to being sensed while bending direction and curvature, and solves Temperature cross-over sensitive issue.With it is simple in structure, be easy to
The features such as manufacture, high sensitivity.
Description of the drawings
Fig. 1 is the mating measuring device schematic diagram of sensor.
Fig. 2 is sensor section structural schematic diagram.
Fig. 3 is fibre core basic mode X polarizations and Defect Modes directional couple schematic diagram.
Fig. 4 is curvature and loss spectra relational graph under differently curved direction.
Fig. 5 is curvature and loss peak drift value relational graph under different temperatures.
Fig. 6 is that any direction is bent decomposition diagram.
Specific implementation mode
In order to make technical problem solved by the invention, technical solution and advantageous effect be more clearly understood, with reference to
The utility model is described in detail in attached drawing 1-6.It should be appreciated that specific embodiment described herein is only explaining this hair
It is bright, it is not intended to limit the present invention.
A kind of ethyl alcohol filling photonic crystal fiber bending sensor based on directional couple proposed in the utility model,
Measuring device schematic diagram is as shown in Figure 1, including light source part (1), coupling part (2), Sensor section (3), demodulation part
(4).Wherein Sensor section is made of sensor and bending bringing device, two single mode optical fibers of the both ends welding of sensor,
This two single mode optical fibers are fixed on respectively on two scale rotation fiber holders, pass through the rotatable sensor light of runing rest
It is fine.Sensor is fixed by the bracket on platform, manufactures bending by hanging up counterweight with line on a sensor, changing counterweight can
Change bending curvature.
The utility model proposes ethyl alcohol based on directional couple fill photonic crystal fiber bending sensor, structure is such as
Shown in Fig. 2, sensor section includes 5 layers of regular hexagon airport, and the outer first layer of fibre core is macropore (5), and vertical direction, which introduces, to be lacked
Chamber VD1 and VD2 (6) are fallen into, horizontal direction introduces defect cavity HD1 and HD2 (7), ethyl alcohol (8) is filled inside four defect cavities,
Vertical direction defect cavity internal layer has adjustment hole (9).
The utility model proposes ethyl alcohol based on directional couple fill photonic crystal fiber bending sensor, bending is surveyed
The realization process of amount is specific as follows：On the basis of Fig. 2 sensor structures, using finite element method and perfect domination set to passing
Sensor electromagnetic field mode is analyzed and researched, and the results are shown in Figure 3.It is fixed with Defect Modes that fibre core basic mode X polarizations are illustrated in figure
Into coupling process, pattern effective refractive index and limitation Dissipation change situation.It can be seen that horizontal and vertical direction defect
With fibre core basic mode X polarizations directional couple can occur for mould respectively, to make basic mode go out to generate loss peak in different wave length.Vertical direction
The coupled wavelength of defect cavity VD1, VD2 and basic mode is at 1433.5nm, and the coupling of horizontal direction defect cavity HD1, HD2 and basic mode
Wavelength is at 1549nm.Next, applying the bending of any direction to optical fiber using Fig. 1 corollary apparatus.In FEM calculation,
Bending is equivalent to gradually changed refractive index model, shown in the following formula of relationship between curvature and fiber optic materials refractive index, whereinC
For curvature,n’(x,y)For fiber cross-sections each point refractive index after bending,n(x,y)For fiber cross-sections each point refractive index before bending.
。
Variations in refractive index that bending generates is substituted into finite element model and is calculated, is bent and builds with fundamental mode confinement losses
Relationship.It is illustrated in figure 4 curvature and loss spectra relational graph under differently curved direction.From the graph, it is apparent that in optical fiber along Y
When direction is bent, the loss peak of the coupling generation of vertical direction defect cavity VD1, VD2 and basic modeAs bending curvature increases,
Gradually it is split into two peaksWith, loss peak that the coupling of horizontal direction defect cavity HD1 at this time, HD2 and basic mode generates
It remains unchanged.And optical fiber is when being bent in X direction, the loss peak that the coupling of horizontal direction defect cavity HD1, HD2 and basic mode generates
As bending curvature increases, it is gradually split into two peaksWith, vertical direction defect cavity VD1 at this time, the coupling of VD2 and basic mode
Close the loss peak generatedIt remains unchanged.
Consider the influence factor of temperature, the influence to fiber optic materials is mainly thermo-optic effect and thermal expansion effects.Take heat
Backscatter extinction logarithmic ratio, coefficient of thermal expansion is, the thermo-optical coeffecient of ethyl alcohol is, to not
Synthermal lower bending and fundamental mode confinement losses relationship is studied.Curvature under different temperatures is illustrated in figure 5 to drift about with loss peak
Magnitude relation figure.Randomly select 5 arbitrary temps, respectively 45 DEG C, 51 DEG C, 37 DEG C, 69 DEG C, 31 DEG C.Since ethyl alcohol is to temperature
It is sensitive, it can be seen that loss peakAnd its division is bimodalWith, loss peakAnd its division is bimodalWith
Drift value be all influenced by temperature, movement with the non-linear variation of curvature.But the drift value of bimodal difference
WithIt is not acted upon by temperature changes, linear relationship is kept with curvature.Thus the drift of bimodal difference can be used
Amount carries out curvature sensing, can exclude the factor of Temperature cross-over sensitivity.Transducer curvature sensitivity can be obtained according to following formula,
X-direction is bent the curvature sensitivity with Y-direction bendingWith3.212nm/m-1 and 4.086nm/m-1 are respectively reached.
。
Finally by can any direction bending be decomposed orthogonal direction as shown in Figure 6, to poor using two drift values
Value is sensed.According to Fig. 4 characteristics, different directions are bent to loss peakWithDifference is influenced, it is orthogonal so as to utilize
The bending of any direction is decomposed XY axis by the mode of decomposition, to be solved.Optical fiber axial direction can be defined as to z-axis, vertically
It is y-axis in optical fiber fixed pan, level is x-axis in optical fiber fixed pan, then fiber cross-sections are in X/Y plane, at this time bending side
It is indicated to an angle, θ can be used in X/Y plane.It, can be in the hope of the song of any direction θ using following formula according to the above characteristic
Rate, and eliminate the cross sensitivity of temperature.
。
By the above-mentioned means, the utility model realizes a kind of ethyl alcohol filling photonic crystal fiber bending based on directional couple
Sensor is realized any direction crooked sensory of temperature-insensitive by way of ethyl alcohol filling and directional couple, has knot
The characteristics of structure is simple, high sensitivity.
Claims (3)
1. a kind of ethyl alcohol based on directional couple fills photonic crystal fiber bending sensor, it is characterised in that：Regular hexagon pair
The outer first layer of fibre core is referred to as macropore (5) in the airport of distribution, and vertical direction introduces defect cavity VD1 and VD2 (6), level side
To defect cavity HD1 and HD2 (7) is introduced, ethyl alcohol (8) is filled inside four defect cavities, vertical direction defect cavity internal layer, which has, to be adjusted
Knothole (9)；Its mating sensing device is by light source part (1), coupling part (2), Sensor section (3), demodulation part (4) group
At light source part provides light source with wideband light source for entire sensor-based system, and coupling part includes Polarization Controller and single-mode optics
Wideband light source signal after polarization filtering is introduced sensor using single mode optical fiber and modulated optical signal is passed to demodulation section by fibre
Point, Sensor section is used for modulated optical signal, and demodulation part is using spectrometer demodulation output through the modulated optical signal of sensor.
2. a kind of ethyl alcohol based on directional couple according to claim 1 fills photonic crystal fiber bending sensor,
It is characterized in that：The outer first layer diameter macropores of fibre core are 1.62 μm, and a diameter of 1.3 μm of airport, air pitch of holes is 2.5 μm, is lacked
Fall into a diameter of 0.6 μm of chamber VD1 and VD2, HD1 and a diameter of 0.65 μm of HD2, a diameter of 0.5 μm of defect cavity adjustment hole；Temperature is 20
DEG C when, take ethyl alcohol refractive index be 1.36048.
3. a kind of ethyl alcohol based on directional couple according to claim 1 fills photonic crystal fiber bending sensor,
It is characterized in that：Both horizontally and vertically defect cavity filling ethyl alcohol will produce Defect Modes, respectively can with basic mode generate couple thus
Fundamental mode loss peak is generated, curvature effect horizontally or vertically can be such that its loss peak generated for direction Defect Modes and basic mode occurs
Bimodal division, and this to divide bimodal difference linearly sensitive to bending curvature, and to temperature-insensitive.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132894A (en) * | 2019-05-16 | 2019-08-16 | 中国矿业大学 | A kind of photonic crystal fiber methane sensing device of temperature-compensating |
-
2018
- 2018-04-02 CN CN201820453287.7U patent/CN207936923U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132894A (en) * | 2019-05-16 | 2019-08-16 | 中国矿业大学 | A kind of photonic crystal fiber methane sensing device of temperature-compensating |
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