CN208459265U - A kind of detection device of miniature ethanol solution concentration - Google Patents
A kind of detection device of miniature ethanol solution concentration Download PDFInfo
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- CN208459265U CN208459265U CN201820590413.3U CN201820590413U CN208459265U CN 208459265 U CN208459265 U CN 208459265U CN 201820590413 U CN201820590413 U CN 201820590413U CN 208459265 U CN208459265 U CN 208459265U
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- photonic crystal
- concentration
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Abstract
The utility model relates to a kind of detection devices of miniature ethanol solution concentration, comprising: light source, input coupling lens, photonic crystal, output coupling lens, photoelectric detector, display；The light source uses the laser of certain wavelength, the selection of laser according toIt determines, a (μm) is lattice constant, and Δ Gap is the corresponding maximum normalization bandgap range central value of TE mould, λ under solution various concentration to be measured0It is the central wavelength of selected laser, the wave-length coverage of tuning is depending on wavelength corresponding at maximum band gap.A kind of miniature ethanol monitoring instrument device sensitivity is high in the utility model, as long as concentration has small variation, dielectric constant will change, and then band gap will change, and photoelectric detector can detect.
Description
Technical field
The utility model discloses a kind of detection device of solution concentration, especially a kind of detection of miniature ethanol solution concentration
Device.
Background technique
Ethyl alcohol is commonly called as alcohol, is a kind of raw material of industry on basis, is widely used in the neck such as military project, medicine, chemical industry, food
Domain.China is Chan Jiu big country, there is time-honored " spirits culture ", and compatriots more than half have the habit drunk.It is suitable
It drinks, can not only relieve fatigue and mitigate psychological pressure, but also can build pleasant atmosphere, be conducive to the daily life of people
Living and work.It is well known that wine in the market is various in style, and quality difference is very big.The quality of wine depends primarily on production
The control of fermented product quality in the process, and the measurement of concentration of alcohol is the key that wine and related fermented product quality control
One.Concentration of alcohol is procedure parameter important in fermentation process, and the control, optimization and fermentation for directly affecting fermentation process produce
The quality and yield of product.In industrial circle, alcohol fuel is " 15 " demonstration project major project, and China will greatly develop fuel
Ethyl alcohol.Therefore the measuring device for developing concentration of alcohol is necessary, the measuring device of especially miniature concentration of alcohol.
Have both at home and abroad about the measurement method of concentration of alcohol at present: Refractive Index Method, density bottle method, alcohol meter method, chemical oxygen
The methods of change method, spectrophotometric method, near infrared spectroscopy, fluorimetry, laser Raman spectrometry, microorganism electrode.
Refractive Index Method utilizes the difference of ethyl alcohol and methanol physical property, but precision is not high；Density bottle method measuring accuracy is high, but operates numerous
Trivial time-consuming, analysis time is longer；Alcohol meter method operates simple and fast, is the common method of alcohol determining, but interference free performance is poor；
Chemical oxidization method and spectrophotometric method are easy using instrument, easy to operate；Near infrared spectroscopy have it is pollution-free, without destruction
Property, without pre-treatment, it is convenient and efficient the advantages that, but integrated level is not high；The fluorimetry range of linearity is wide, sensitivity is higher, selection
Property is good, but needs strict temperature control；Expensive equipment needed for laser Raman spectrometry is not suitable for the quick detection at scene；Micro- life
Preferably, monitoring can be traced, but electrode life is low in object electrode method reproducibility, selectivity.Therefore, develop it is a kind of have high integration,
High precision, pollution-free, the operable ethanol monitoring instrument device and method of room temperature have the fields such as industry, food great
Meaning.
Summary of the invention
The purpose of this utility model is the Properties Forbidden Band using photonic crystal, designs and has made a kind of Concentration Testing dress
It sets, present apparatus core technology is the Properties Forbidden Band using photonic crystal, and constructs detection device with this.By photonic crystal designs at
Two-dimentional triangular crystal lattice, silicon dielectric posts, air background material.By select monocrystalline silicon be base material, using exposure mask, HBr etc. from
The method of son etching prepares photonic crystal.Silicon dielectric posts and lattice constant are all micron orders, are easily integrated encapsulation.The detection device
Sensitivity with higher.Meanwhile because being neither related to chemical change in detection process, other impurity are not introduced yet, so
This detection device also have many advantages, such as cleaning, it is pollution-free.This detection device both can carry out offline inspection with independent finished products, can also
To be encapsulated in container bottom, on-line real-time measuremen is carried out.
The photonic crystal band that the utility model is mentioned is characterized according to the photonic crystal parameters designed in the utility model
It is studied using plane wave expansion method.In two-dimensional photon crystal structure, dielectric posts (or airport) are evenly distributed
Made of, dielectric constant is periodic arrangement on the direction vertical with dielectric posts (or airport).In passive space, electricity
Magnetic wave is propagated in photonic crystal (isotropism is lossless nonmagnetic) to be described with following two wave equation:
By periodic functionExpand into fourier series form:
In formulaFor the wave vector in first Brillouin-Zone,For lattice two dimension reciprocal lattice vector.Above three formula is substituted into
Wave equation abbreviation obtains
TE modal eigenvalue equation:
TM modal eigenvalue equation:
For the photonic crystal of triangular crystal lattice, the dielectric constant in above-mentioned eigen[value is represented by
Wherein J1It is first-order bessel function,For the fill factor of triangular crystal lattice, εaBe dielectric posts dielectric it is normal
Number, εbIt is the dielectric constant of background material.R is the radius of dielectric posts, and a is lattice constant.
Dielectric constant is substituted into above-mentioned two eigen[value, calculates the bandgap structure of triangular crystal lattice photonic crystal.It is computed,
For the photonic crystal of silicon dielectric posts (dielectric constant 11.7) triangular crystal lattice, TM mode does not occur apparent band gap, and
There are larger band gap for TE mode, therefore the utility model is only limitted to TE mode.(dielectric constant is greater than different background dielectric constant
11.7) band gap width is also different, and the two is in linear approximate relationship:
Δgap=m × εb+n, (1)
Wherein ΔgapFor band gap width, m is regression coefficient, εbFor background dielectric constant, n is constant term.Take different back
Scape dielectric constant substitutes into eigen[value and calculates, and above-mentioned calculated result is fitted, and regression coefficient is 0.00063 in above formula,
Constant term is -0.00455.
For specific solution, ε can also be indicated with linear approximate relationship between concentration and dielectric constantb=p × C+
T,
(2)
Wherein C is concentration, and p is regression coefficient, εbIt is background dielectric constant, t is constant term.According to document (A Budu external force
Application study [D] Xinjiang University of the A Budu gram force wood photonic crystal band theory in solution concentration detection, 2015.) in
Data (as shown in table 1.1), fitting obtain the relationship between the dielectric constant of ethanol solution and percentage: εb=-0.5
× C+81.6, degree of fitting 0.99 are in highly linear relationship.Simultaneous (1), (2) two formulas can find out concentration C and band gap width
ΔgapBetween relationship
The concentration of solution can be found out by band gap width.
Specifically, for ethanol solution (temperature 293.15K), percentage C and band gap width ΔgapBetween close
It is formula are as follows:
C=-317.4603 × Δgap+148.756。
According to above-mentioned principle, proposes a kind of concentration detection method and design a kind of miniature concentration detection apparatus.
The utility model relates to miniature concentration detection apparatus main composition part include: a kind of miniature Concentration Testing dress
It sets, it is characterised in that: include: light source, input coupling lens, photonic crystal, output coupling lens, photoelectric detector, display；
The light source uses the laser of certain wavelength；The photonic crystal both ends have input coupling lens, output coupling lens；Institute
It states photoelectric detector to be used to measure the light intensity after photonic crystal, show that the forbidden band of photonic crystal is wide by light intensity variation
Degree, and then obtain solution concentration to be measured；The display is used to export the concentration value of display measurement.
The photonic crystal is triangular crystal lattice structure, and a=1 μm of lattice constant, silicon dielectric posts, radius r=0.4a, dielectric is normal
Number is 11.7.
The selection of the laser according toIt determines, a (μm) is lattice constant, and Δ Gap is that solution to be measured is different
The corresponding maximum normalization bandgap range central value of TE mould, λ under concentration0It is the central wavelength of selected laser, the wavelength of tuning
Range is depending on wavelength corresponding at maximum band gap.
The utility model has the advantages that
(1) the utility model uses silicon as photonic crystal substrate, and since silicon is in nature rich content, price is low
It is honest and clean, and manufacturing process is simple, batch production easy to accomplish；
(2) in the present invention, photonic crystal is small-sized, is convenient for integration packaging.Both can with independent finished products, carry out from
Line detection, can also be encapsulated in inside some containers, carry out on-line checking；
(3) the utility model is not related to chemical change, does not also introduce other impurity, therefore this concentration of alcohol detection dress
Setting has many advantages, such as pollution-free, cleaning；
(4) a kind of miniature ethanol monitoring instrument device sensitivity is high in the utility model, as long as concentration has small variation,
Dielectric constant will change, and then band gap will change, and photoelectric detector can detect；
(5) the device substantial length of operation of the utility model is simple, safe, is easy universal.
Detailed description of the invention
Fig. 1 is the graph of relation of table 1.1 ethyl alcohol (293.15K) percentage and dielectric constant；
Fig. 2 is the graph of relation of table 1.2 dielectric constant and band gap width；
Fig. 3 is background dielectric constant calculated TE mode energy band diagram when being 70；
Fig. 4 is background dielectric constant calculated TE mode energy band diagram when being 35；
Fig. 5 is the lattice structure figure of triangular crystal lattice, circular media column；
Fig. 6 is photon crystal structure top view；
Fig. 7 is photonic crystal incident end face figure；
Fig. 8 is photonic crystal outgoing end view drawing；
Fig. 9 is photonic crystal incident end face perspective view；
Figure 10 is photonic crystal production flow diagram；
Figure 11 is a kind of miniature concentration detection apparatus figure.
In figure: 1- coupling input lens, 2- couple output lens, 3- silicon dielectric posts, 4- silicon base, 5- light source, 6- photon
Crystal, 7- photoelectric detector, 8- display, 9- solution to be measured.
Specific embodiment
The utility model is described in further detail combined with specific embodiments below.
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, with reference to the accompanying drawing to this reality
It is described in further detail with novel.It should be appreciated that specific embodiment described herein is only used to explain the utility model,
It is not used to limit the utility model.
The miniature concentration detection apparatus of one of the utility model includes: light source, input coupling lens, photonic crystal, defeated
Coupled lens, photoelectric detector, display out.
Light source uses the laser of certain wavelength in a kind of miniature concentration detection apparatus.The selection of laser according toIt determines, a (μm) is lattice constant, and Δ Gap is the corresponding maximum normalization band of TE mould under solution various concentration to be measured
Gap range central value, λ0It is the central wavelength of selected laser, the wave-length coverage of tuning is according to corresponding wavelength at maximum band gap
Depending on.
Photonic crystal making step includes: to select monocrystal as substrate in a kind of miniature concentration detection apparatus；
Wafer Cleaning and low temperature drying；The mask film covering version on silicon wafer；The SiO2 of thermally grown one layer of 500nm or so；Mask plate is removed,
The SiO2 layers of mask plate new as substrate silicon；With HF acid soak 15 seconds, cleaning；It is packed into the etching container containing a certain amount of helium, and
With HBr plasma etching, air pressure 6.65Pa, total gas couette 100sccm, etch period 3 hours；Remove SiO2 layers；Then
The particle of removal silicon face is cleaned with NH4OH；Finally obtain photonic crystal.
Photonic crystal both ends have input coupling lens in a kind of miniature concentration detection apparatus, and output coupling is saturating
Mirror.
Photoelectric detector is used to measure the light intensity after photonic crystal in a kind of miniature concentration detection apparatus,
The forbidden bandwidth of photonic crystal (immersing prepare liquid such as ethanol solution) is obtained by light intensity variation, and then show that solution to be measured is dense
Degree.
Display in a kind of miniature concentration detection apparatus is used to export the concentration value of display measurement.
Photonic crystal in a kind of miniature concentration detection apparatus is triangular crystal lattice structure, a=1 μm of lattice constant,
Silicon dielectric posts, radius r=0.4a, dielectric constant 11.7, such as Fig. 5.Background material is solution to be measured, is selected in the utility model
It uses ethanol water as case study on implementation, other solution (dielectric constant is greater than silicon, such as methanol solution) can also be selected to make
For background material.
A kind of miniature Concentration Testing principle: for the silicon dielectric posts photonic crystal of triangular crystal lattice structure, difference back
Scape dielectric constant, it is different corresponding to the band gap width under TE mode, such as Fig. 3, Fig. 4；And different background dielectric constants is corresponding not
With the ethanol solution of concentration, such as table 1.1.
Table 1.1 different concentration of alcohol percentage and corresponding dielectric constant
Through over-fitting, finds concentration of alcohol percentage (%) and dielectric constant is in linear approximate relationship, such as Fig. 1, fitting song
Line are as follows: y=81.6-0.5 × x, degree of fitting: R2=0.99；Dielectric constant is also linear with band gap width, such as Fig. 2, intends
Close curve: y=0.00063 × x-0.00455, degree of fitting: R2=0.97319.
Table 1.2 takes different background dielectric constant to substitute into the band gap width that eigen[value calculates
Fig. 6 is the top view of photonic crystal in a kind of miniature concentration detection apparatus, and wherein blank parts are by HBr
Plasma etching, circular is silicon dielectric posts, and the projected square part of four side black is silicon, and total is full of medium just as one
The photonic crystal slot of column, blank parts are exactly the solution to be measured (ethanol solution) accommodated.
Fig. 7 is the incident end face figure of photonic crystal in a kind of miniature concentration detection apparatus, wherein 1 be exactly couple it is defeated
Enter lens.
Fig. 8 is the outgoing end view drawing of photonic crystal in a kind of miniature concentration detection apparatus, wherein 2 be exactly couple it is defeated
Lens out.
Fig. 9 is the perspective view of the incident end face of photonic crystal in a kind of miniature concentration detection apparatus, wherein 3 be silicon
Dielectric posts, 4 be silicon base.
Figure 11 is a kind of miniature concentration detection apparatus, is followed successively by light source 5, input coupling lens 1, light from left to right
Sub- crystal 6, solution to be measured 9, silicon dielectric posts 3, output coupling lens 2, photoelectric detector 7, display 8.
The coupling input lens 1 of photonic crystal are coupled with front end light source 5 in a kind of miniature concentration detection apparatus.
The coupling output lens 2 of photonic crystal and rear end photoelectric detector 7 in a kind of miniature concentration detection apparatus
Coupling.
The rear end photoelectric detector 7 of photonic crystal is connected with display 8 in a kind of miniature concentration detection apparatus.
The above is only the preferred embodiment of the utility model, not makees limit in any form to the utility model
System, any person skilled in the art are not departing within the scope of technical solutions of the utility model, according to the utility model
Technical spirit, any simple modifications, equivalent substitutions and improvements to the above embodiments etc., still falls within the utility model
Within the protection scope of technical solution.
Claims (3)
1. a kind of detection device of miniature ethanol solution concentration, it is characterised in that: include: light source, input coupling lens, photon crystalline substance
Body, output coupling lens, photoelectric detector, display；The light source uses the laser of wavelength；The photonic crystal both ends tool
There are input coupling lens, output coupling lens；The photoelectric detector is used to measure the light intensity after photonic crystal, passes through
Light intensity changes the forbidden bandwidth for obtaining photonic crystal, and then obtains solution concentration to be measured；The display is used to export display and surveys
The concentration value of amount.
2. the detection device of miniature ethanol solution concentration according to claim 1, it is characterised in that: the photonic crystal is
Triangular crystal lattice structure, a=1 μm of lattice constant, silicon dielectric posts, radius r=0.4a, dielectric constant 11.7.
3. the detection device of miniature ethanol solution concentration according to claim 1, it is characterised in that: the choosing of the laser
Select basisIt determines, a μm is lattice constant, and Δ Gap is the corresponding maximum normalizing of TE mould under solution various concentration to be measured
Change bandgap range central value, λ0It is the central wavelength of selected laser, the wave-length coverage of tuning is according to corresponding at maximum band gap
Depending on wavelength.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535197A (en) * | 2018-04-24 | 2018-09-14 | 南京信息工程大学 | A kind of detection device and method of miniature ethanol solution concentration |
| CN112683793A (en) * | 2020-12-09 | 2021-04-20 | 哈尔滨工程大学 | Sensor for detecting concentration of liquid drops based on double-microsphere coupling mode splitting |
-
2018
- 2018-04-24 CN CN201820590413.3U patent/CN208459265U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535197A (en) * | 2018-04-24 | 2018-09-14 | 南京信息工程大学 | A kind of detection device and method of miniature ethanol solution concentration |
| CN112683793A (en) * | 2020-12-09 | 2021-04-20 | 哈尔滨工程大学 | Sensor for detecting concentration of liquid drops based on double-microsphere coupling mode splitting |
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| GR01 | Patent grant | ||
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Granted publication date: 20190201 Termination date: 20210424 |