CN208672668U - A kind of wind speed measuring device based on surface plasma body resonant vibration - Google Patents
A kind of wind speed measuring device based on surface plasma body resonant vibration Download PDFInfo
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- CN208672668U CN208672668U CN201821664344.2U CN201821664344U CN208672668U CN 208672668 U CN208672668 U CN 208672668U CN 201821664344 U CN201821664344 U CN 201821664344U CN 208672668 U CN208672668 U CN 208672668U
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Abstract
The utility model belongs to photoelectric detection technology field, is related to a kind of wind speed measuring device based on surface plasma body resonant vibration.The device includes wide spectrum light source, heated light sources, fibre optical sensor, spectrometer, coupler, isolator B, isolator C, circulator, single mode optical fiber, measuring wind speed pipeline, the fibre optical sensor is the fibre optic temperature sensor based on surface plasma body resonant vibration and strain compensation, the sensor fibre is coated with the metallic film for generating surface plasma body resonant vibration by two medium holes inner walls of the relative edge center of the outside second layer hexagon medium aperture layer of fibre core respectively, it is coated with filled media A in a medium holes and two medium holes that same layer is adjacent for metallic film, filled media B in the unfilled All Media hole of medium A, when the temperature of fibre optical sensor changes, the resonant wavelength variation of metallic film A and B are inconsistent, acquire strain value, and then it eliminates strain influence and acquires temperature value, optical fiber heat is calculated with this again Line wind speed.
Description
Technical field
The utility model belongs to photoelectric detection technology field, is related to a kind of measuring wind speed based on surface plasma body resonant vibration
Device.
Background technique
For hot line wind measurement method as a kind of widely used gas flow rate measurement method, principle is logical using air-flow
Relationship when high temp objects between taken away high temp objects surface heat and air-flow velocity is crossed, realizes the measurement to air-flow velocity, is led to
Air flow velocity can be obtained in the temperature for crossing measurement high temp objects.
Due to requirement of explosion proof is higher, electromagnetic interference is relatively strong and strong corrosive environment in electronic type hot line wind speed sensing equipment without
Method uses, and fiber plant has the characteristics that intrinsic safety, electromagnetism interference, anti-deep-etching, therefore optical fiber hot line measuring wind speed
Technology becomes one of the important directions of gas flow rate sensing.At present optical fiber hot line wind speed method for sensing mainly utilize fiber grating,
Temperature and wind speed of the fiber resonance cavity as sensor measurement test environment.But since fiber grating and fiber resonance cavity are corresponding
Power is also sensitive, therefore while measuring temperature and wind speed, measurement result will receive the influence of stress.In addition, fiber grating and
The temperature of fiber resonance cavity and wind speed sensitivity are not high enough, for example, the temperature sensitivity of fiber grating is 0.01nm/ DEG C, and mesh
The optical wavelength resolving power of preceding general spectrometer only has 0.02nm, therefore cannot achieve high-precision measuring wind speed, and wind speed
Measuring range is also restrained.
Surface plasma resonance is a kind of nonlinear optical phenomena, when the light met certain condition penetrates optical medium
When being irradiated to metal surface, Light energy transfer electron can be formed plasma, this phenomenon is surface plasma body resonant vibration,
Generation surface plasma body resonant vibration optical wavelength corresponding when most strong is surface plasma body resonant vibration wavelength.Due to surface etc.
Gas ions resonant wavelength has higher sensitivity to optical medium refractive index, while utilizing the design feature of photonic crystal fiber, light
Fine surface plasma body technique is widely used in the measurement of highly sensitive medium refraction index, further, using medium refractive index with
Relational implementation temperature measurement between medium temperature, and utilize relational implementation measuring wind speed between temperature and wind speed.Due to photonic crystal
The geometric dimension and structure of optical fiber and metal equally will affect resonant wavelength, therefore when fibre optical sensor is generated by stress influence
When strain, the measurement result of wind speed can be made to generate deviation.But the current optical fiber based on Applications of surface plasmon resonance passes
Sensor can not eliminate the influence strained to measurement result.
Utility model content
For overcome the deficiencies in the prior art, by the way that the total based on surface plasma of strain and temperature can be measured simultaneously
The fibre optical sensor of vibration realizes not strained influence and has highly sensitive fiber wind speed measuring device and method.In device
Two different surface plasma resonances of middle generation, using two surface plasma resonances resonant wavelength with
Wind speed and the feature of strain movement calculate strain value, and calculate the air speed value after strain compensation in turn.
The utility model the specific technical proposal is:
A kind of wind speed measuring device based on surface plasma body resonant vibration, including wide spectrum light source, heated light sources, Fibre Optical Sensor
Device, spectrometer, coupler, isolator B, isolator C, circulator, single mode optical fiber, measuring wind speed pipeline；Spectral region covers light
Fiber sensor operating wavelength range；The operating wavelength range of spectrometer covers fibre optical sensor operating wavelength range；Wide spectrum light source
It is connected by single mode optical fiber with isolator B, heated light sources are connected by single mode optical fiber with isolator C, and isolator only allows light to believe
Number one-way transmission；Isolator B and isolator C passes through single mode optical fiber respectively and is connected with coupler；Circulator passes through single mode optical fiber point
It is not connected with coupler, fibre optical sensor and spectrometer, wherein from the light of single mode optical fiber BE incidence circulator from single mode optical fiber BF
Output is exported from the light of single mode optical fiber BF incidence circulator from single mode optical fiber BG；Fibre optical sensor be located at measuring wind speed pipeline it
In；The fibre optical sensor is the fibre optic temperature sensor based on surface plasma body resonant vibration and strain compensation, is mainly tied
Structure is sensor fibre, which is solid photonic crystal fiber, and the medium holes of photonic crystal fiber are centered on fibre core
It arranges in regular hexagon multilayer, medium holes are arranged at least two layers of the number of plies, the diameter of the medium holes medium holes adjacent with any two
Between the ratio of distance be 3:5, by two media of the relative edge center of the outside second layer hexagon medium aperture layer of fibre core
Hole inner wall is coated with metallic film respectively, and the metallic film is using the metal material that can generate surface plasma body resonant vibration；It is described
Be coated with filled media A in a medium holes and two medium holes that same layer is adjacent for metallic film, the refractive index of the medium A with
It is negative correlativing relation between temperature；Filled media B in the unfilled All Media hole of medium A, the refractive index of the medium B is not by temperature
Degree influences.
The medium distance between borehole of the fibre optical sensor is 2 μm.
Protection sleeve pipe is wrapped up outside the sensor fibre, protection sleeve pipe material is quartz or organic glass.
The thickness of metal film is 20nm~60nm, and the metal material of metallic film is gold or silver.
The medium A is diethylene glycol (DEG).
The medium B is air.
Using the wind measurement method of above-mentioned apparatus are as follows: the optical signal that wide spectrum light source issues enters isolation by single mode optical fiber
Device B, the optical signal that heated light sources issue enter isolator C by single mode optical fiber, and the optical signal of isolator B output is through single mode optical fiber
Into coupler, the optical signal of isolator C output enters coupler through single mode optical fiber, and the optical signal of coupler output is through single-mode optics
Fine BE enters circulator, and the output optical signal of circulator enters fibre optical sensor by single mode optical fiber BF, in fibre optical sensor,
Light signal strength at the surface plasma resonance wavelength of metallic film A and metallic film B is lost, and produces wide range optical signal
Raw two light intensity paddy, and when optical signal reaches the distal end faces of fibre optical sensor, part optical signals reflect, by list
Mode fiber BF enters circulator, and the output optical signal of circulator enters spectrometer by single mode optical fiber BG, by observing spectrometer
The wavelength location of two light intensity paddy of upper display, can be obtained air speed value.
Specific measuring process is as follows:
1. starting heated light sources, wide spectrum light source and spectrometer.
2. observing the surface plasma resonance wavelength value of metallic film A and metallic film B on spectrometer.
3. strain value is calculated according to the surface plasma resonance wavelength value of metallic film B.
4. calculating the strained influence of surface plasma body resonant vibration wavelength of metallic film A according to the strain value being calculated
The variable quantity of generation.
5. subtracting and being calculated using the surface plasma body resonant vibration wavelength value of the metallic film A observed on spectrometer
Metallic film A surface plasma body resonant vibration wavelength it is strained influence generate variable quantity, the table of metallic film A is calculated
The wavelength value that surface plasma resonance wavelength is only moved to by air speed influence.
6. the wave being only moved to by air speed influence according to the surface plasma body resonant vibration wavelength for the metallic film A being calculated
Long value calculates air speed value.
Further, the measuring principle of the above-mentioned wind measurement method based on Applications of surface plasmon resonance is: heating
The stable optical signal of source device output optical power, heats fibre optical sensor, and the temperature of fibre optical sensor is made to be higher than environment temperature
Degree, in the environment that no gas flows, the temperature value highest of light sensor, when wide range optical signal enters light sensor B,
Since metallic film A and metallic film B are excited to generate surface plasma resonance, in wide range optical signal metallic film A and
Light signal strength at the surface plasma body resonant vibration wavelength of metallic film B is weakened, and therefore, can be observed on spectrometer
Two light intensity decline paddy, and the wavelength that light intensity declines the lowest point is corresponding with metallic film A and metallic film B resonant wavelength, surface etc.
Gas ions resonant wavelength is related with the geometry of the refractive index of filled media in medium holes and metallic film, works as fibre optical sensor
When in gas flowfield, since air-flow takes away the heat of fibre optical sensor, the temperature of light sensor with wind speed increasing
It reduces greatly, since the refractive index of medium A changes with temperature, and the refractive index of medium B does not change with temperature, because
This, the surface plasma body resonant vibration wavelength of metallic film A generates movement with the variation of wind speed, and the surface etc. of metallic film B
Gas ions resonant wavelength does not change, in addition, gas flowfield makes light sensor B generate strain, makes metallic film A and metal
The surface plasma wavelength of film B generates movement, is moved using the wavelength of the decline paddy of light intensity corresponding to spectrometer measurement metallic film B
Momentum can measure strain value, in wind speed and strain while be made using the decline paddy of light intensity corresponding to spectrometer measurement metallic film A
Wavelength moving total under, in conjunction with the strain value measured, calculate the surface plasma body resonant vibration wavelength of metallic film A only by
Amount of movement under wind speed effect, and then air speed value is acquired, effectively eliminate the influence that strain generates measuring wind speed.
The utility model has the following beneficial effects:
1) the utility model proposes the fibre optic temperature sensor based on surface plasma body resonant vibration and strain compensation, realize
A kind of highly sensitive temperature based on optical fiber technology, strain measurement method simultaneously.
2) the utility model proposes the wind measurement method based on surface plasma body resonant vibration, solve optical fiber hot line wind
The low problem of fast instrument sensitivity.
3) the utility model proposes the wind measurement method based on surface plasma body resonant vibration, expand optical fiber hot line wind
The range of fast instrument.
4) the utility model proposes the wind measurement method based on surface plasma body resonant vibration, solve strain to optical fiber
The influence problem of hot-wire anemometer measurement accuracy.
5) the utility model proposes the wind speed measuring device based on surface plasma body resonant vibration, it is corrosion-resistant, not vulnerable to electricity
Magnetic disturbance can be applied in harsh detection environment.
Detailed description of the invention
Fig. 1 is the fibre optic temperature sensor knot provided by the utility model based on surface plasma body resonant vibration and strain compensation
Structure schematic diagram.
Fig. 2 is sensor fibre structural schematic diagram provided by the utility model.
Fig. 3 is that the fibre optic temperature sensor provided by the utility model based on surface plasma body resonant vibration and strain compensation exists
Spectrogram under different temperatures.
Fig. 4 is the surface plasma resonance wavelength with temperature change curve of metallic film A provided by the utility model.
The surface plasma resonance wavelength that Fig. 5 is metallic film A provided by the utility model and metallic film B becomes with strain
Change curve graph.
Fig. 6 is the structural schematic diagram of the wind speed measuring device provided by the utility model based on surface plasma body resonant vibration.
Fig. 7 is metallic film A resonant wavelength provided by the utility model with wind speed change curve.
Fig. 8 is on the wind measurement method measuring wind speed provided by the utility model based on Applications of surface plasmon resonance
Limit schematic diagram.
In figure: 11 protection sleeve pipes；12 sensor fibres；131 medium holes A；132 medium holes B；133 medium holes C；134 medium holes
D；141 metallic film A；142 metallic film B；15 photonic crystal fibers；31 wide spectrum light sources；32 heated light sources；33 isolator B；34
Isolator C；35 couplers；36 circulators；37 fibre optical sensors；38 spectrometers；39 measuring wind speed pipelines；313 optical fiber BA；324
Optical fiber BB；335 optical fiber BC；345 optical fiber BD；356 optical fiber BE；367 optical fiber BF；368 optical fiber BG.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with specific embodiment, and
Referring to attached drawing, the specific structure of the utility model, principle and the course of work are described in further detail.
As shown in Figure 1 for the utility model proposes based on the fiber optic temperature of surface plasma body resonant vibration and strain compensation pass
Sensor structure chart.The fiber optic temperature based on Applications of surface plasmon resonance, strain transducer are by 11 and of protection sleeve pipe
Sensor fibre 12 forms.11 outer diameter of protection sleeve pipe is 1mm, using quartz material, for protecting sensor fibre not by test environment
It influences to generate the damage such as fracture.It is illustrated in figure 2 the structure chart of sensor fibre 12.Sensor fibre 12 by photonic crystal fiber 15,
Metallic film A141, metallic film B142, filled media A and filled media B composition, in the medium holes of photonic crystal fiber 15
B132 inner surface is coated with metallic film A141, and the inner surface of medium holes D134 is coated with metallic film B142, metallic film A141 and
Metallic film B142 is the metal that can produce surface plasma resonance, selects gold, thickness is usually 40nm.Medium holes
It A131, medium holes B132, is medium A, remaining All Media Kong Zhongwei medium B, wherein the refraction of medium A in medium holes C133
Rate generates variation with temperature, and the refractive index of medium B does not generate variation with temperature, in the feasibility verifying of the utility model, is situated between
Matter A is diethylene glycol (DEG), and medium B is air.
The utility model proposes the fibre optic temperature sensor based on surface plasma body resonant vibration and strain compensation work
Principle is: when environment temperature changes, the refractive index of medium A changes simultaneously, and the refractive index of medium B does not become
Change, since resonant wavelength is related with filled media refractive index, the surface plasma body resonant vibration wavelength hair of metallic film A141
The surface plasma body resonant vibration wavelength of changing, metallic film B142 does not change, as shown in Figure 3, wherein metallic film
Linear trends of change is presented in the surface plasma body resonant vibration wavelength with temperature of A141, and slope is 6.8nm/ DEG C, as shown in Figure 4；When
When optical fiber receives the effect of external force, cross section of optic fibre becomes ellipse by circle, is influenced by geometry variation, metal foil
The surface plasma body resonant vibration wavelength of film A141 and metallic film B142 changes, as shown in figure 5, metallic film A141 and
The linear change of Different Slope is presented with strain for the surface plasma body resonant vibration wavelength of metallic film B142, and slope is respectively
1318nm/ ε and 190nm/ ε.
Based on the utility model proposes fibre optic temperature sensor based on surface plasma body resonant vibration and strain compensation
Working principle, the utility model proposes the wind measurement method of the wind speed measuring device based on surface plasma body resonant vibration, structures
As shown in Figure 6.Its course of work are as follows: the optical signal that wide spectrum light source 31 issues enters isolator B33 by optical fiber BA313, heats
The optical signal that light source 32 issues enters isolator C34 by optical fiber BB324, and the optical signal of isolator B33 output is through optical fiber BC335
Into coupler 35；The optical signal of isolator C34 output enters coupler 35 through optical fiber BD345；The light letter that coupler 35 exports
Number entering circulator 36 through optical fiber BE356, the output optical signal of circulator 36 enters fibre optical sensor 37 by optical fiber BF367,
Fibre optical sensor 37 be the utility model proposes the fibre optic temperature sensor based on surface plasma body resonant vibration and strain compensation；
Into in the optical signal of fibre optical sensor 37, the optical signal for resulting from heated light sources 32 is warmed fibre optical sensor 37, generates
Light letter in the optical signal of wide spectrum light source 31, at metallic film A141 and metallic film B142 surface plasma body resonant vibration wavelength
It number is depleted, for generating surface plasma phenomenon；Fibre optical sensor 37 is placed in measuring wind speed pipeline 39；Fibre Optical Sensor
The optical signal that device 37 exports enters circulator 36 by optical fiber BF367, the output optical signal of circulator 36 by optical fiber BG368 into
Enter spectrometer 38, the surface plasma body resonant vibration wavelength position of metallic film A141 and metallic film B142 is shown on spectrometer 38
It sets.When the wind speed in measuring wind speed pipeline 39 increases, the heat that air-flow takes away fibre optical sensor 37 increases therewith, causes optical fiber
The temperature of sensor 37 reduces, so that the refractive index of medium A be made to generate variation, and then makes the surface plasma of metallic film A141
Resonance body wavelength generates variation；Simultaneously as wind speed changes, the strain for causing fibre optical sensor 37 to be generated by wind-force becomes
Change, the surface plasma body resonant vibration wavelength of metallic film A141 and metallic film B142 is caused to generate variation.Metallic film A141
With the relation table of air speed value and strain in the surface plasma body resonant vibration wavelength and measuring wind speed pipeline 39 of metallic film B142
Up to formula are as follows:
| λA=f (v)+bAΔη | (1) | |
| ΔλB=bBΔη | (2) |
In formula, λAIndicate the surface plasma body resonant vibration wavelength of metallic film A141；V indicates air speed value；F (v) indicates wind
The surface plasma body resonant vibration wavelength X of fast v and metallic film A141ARelation function；ΔλBIndicate the surface of metallic film B142
The variable quantity of plasma resonance wavelength；Δ η indicates strain variation amount；bAIndicate that the surface plasma of metallic film A141 is total
The long coefficient of relationship between strain variation amount Δ η of vibration wave；bBIndicate metallic film B142 surface plasma body resonant vibration wavelength with
Coefficient of relationship between strain variation amount Δ η.It, can by calculating the surface plasma body resonant vibration wavelength variable quantity of metallic film B142
To calculate the strain of the generation of fibre optical sensor 37, and then calculate the surface plasma of the metallic film A141 generated due to strain
Resonance body wavelength variable quantity, thus what the surface plasma body resonant vibration wavelength for calculating metallic film A141 was generated by air speed influence
Variable quantity, to effectively eliminate the influence of strain and measure accurate air speed value.
It is illustrated in figure 7 the wind speed v and metallic film A141's obtained using comsol multiphysics simulation calculation
Surface plasma body resonant vibration wavelength XARelation curve, i.e. f (v).As shown in fig. 7, λAIt is therefore monotonous curve utilizes public affairs with v
Show that (2) can calculate the dependent variable of the generation of fibre optical sensor 37, and then calculates λ under the influence of eliminating strainAValue, Jin Erqiu
Air speed value out realizes that the wind speed eliminated under strain interference accurately measures.As shown in Figure 7, Δ λAReduce with the increase of v, works as v
Increase to a certain extent, since spectrometer can not differentiate λAVariable quantity and be unable to measure out accurate air speed value, then wind speed survey
Measure relationship between range and spectrometer resolving power are as follows:
| σ≤min[f(v)-f(v-δ)] | (3) |
In formula, σ indicates the wavelength discrimination of spectrometer；δ indicates wind speed resolving power.It is illustrated in figure 8 wind speed resolving power point
Not Wei 0.2m/s and 0.4m/s when f (v)-f (v- δ) curve condition, wherein spectrometer wavelength resolving power σ be 0.02nm.Such as figure
8 it is found that when wind speed resolving power requirement reaches 0.4m/s, the measuring wind speed upper limit can achieve 27.8m/s, when wind speed resolving power is wanted
It asks when reaching 0.2m/s, the measuring wind speed upper limit also can reach 19m/s, effectively expand the measurement amount of optical fiber hot line wind measurement method
Journey.
Claims (6)
1. a kind of wind speed measuring device based on surface plasma body resonant vibration, which is characterized in that including wide spectrum light source, heating light
Source, fibre optical sensor, spectrometer, coupler, isolator B, isolator C, circulator, single mode optical fiber, measuring wind speed pipeline；Spectrum
Range covers fibre optical sensor operating wavelength range；The operating wavelength range of spectrometer covers fibre optical sensor operation wavelength model
It encloses；Wide spectrum light source is connected by single mode optical fiber with isolator B, and heated light sources are connected by single mode optical fiber with isolator C, isolator
Only allow optical signal one-way transmission；Isolator B and isolator C passes through single mode optical fiber respectively and is connected with coupler；Circulator passes through
Single mode optical fiber is connected with coupler, fibre optical sensor and spectrometer respectively, wherein from the incident circulator of single mode optical fiber BE (356)
Light is exported from single mode optical fiber BF (367), is exported from the light of the incident circulator of single mode optical fiber BF (367) from single mode optical fiber BG (368)；
Fibre optical sensor is located among measuring wind speed pipeline；The fibre optical sensor is to be mended based on surface plasma body resonant vibration and strain
The fibre optic temperature sensor repaid, primary structure are sensor fibre, which is solid photonic crystal fiber, and photon is brilliant
The medium holes of body optical fiber are arranged centered on fibre core in regular hexagon multilayer, and medium holes are arranged at least two layers of the number of plies, medium holes
The ratio of the diameter medium distance between borehole adjacent with any two is 3:5, by the second layer hexagon medium aperture layer that fibre core is outside
Two medium holes inner walls of relative edge center be coated with metallic film respectively, the metallic film is using can generate surface etc.
The metal material of ion resonance body；It is filled in a medium holes for being coated with metallic film and adjacent two medium holes of same layer
Medium A is negative correlativing relation between the refractive index and temperature of the medium A；Filled media in the unfilled All Media hole of medium A
The refractive index of B, the medium B are not affected by temperature.
2. the wind speed measuring device according to claim 1 based on surface plasma body resonant vibration, which is characterized in that the light
The medium distance between borehole of fiber sensor is 2 μm.
3. the wind speed measuring device according to claim 1 based on surface plasma body resonant vibration, which is characterized in that the biography
Photosensitive fine outer package protection sleeve pipe, protection sleeve pipe material is quartz or organic glass.
4. the wind speed measuring device according to claim 1 based on surface plasma body resonant vibration, which is characterized in that the gold
Category film thickness is 20nm~60nm, and the metal material of metallic film is gold or silver.
5. the wind speed measuring device according to claim 1 based on surface plasma body resonant vibration, which is characterized in that given an account of
Matter A is diethylene glycol (DEG).
6. the wind speed measuring device according to claim 1 based on surface plasma body resonant vibration, which is characterized in that given an account of
Matter B is air.
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| CN201821664344.2U CN208672668U (en) | 2018-10-15 | 2018-10-15 | A kind of wind speed measuring device based on surface plasma body resonant vibration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109142781A (en) * | 2018-10-15 | 2019-01-04 | 辽宁省计量科学研究院 | A kind of wind speed measuring device and method based on surface plasma body resonant vibration |
-
2018
- 2018-10-15 CN CN201821664344.2U patent/CN208672668U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109142781A (en) * | 2018-10-15 | 2019-01-04 | 辽宁省计量科学研究院 | A kind of wind speed measuring device and method based on surface plasma body resonant vibration |
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