CN106596475A - Apparatus and method for measuring alcohol content by using graphene and PVDF (polyvinylidene fluoride) terahertz plasmon resonance effect - Google Patents
Apparatus and method for measuring alcohol content by using graphene and PVDF (polyvinylidene fluoride) terahertz plasmon resonance effect Download PDFInfo
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- CN106596475A CN106596475A CN201611123623.3A CN201611123623A CN106596475A CN 106596475 A CN106596475 A CN 106596475A CN 201611123623 A CN201611123623 A CN 201611123623A CN 106596475 A CN106596475 A CN 106596475A
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000002033 PVDF binder Substances 0.000 title claims abstract description 32
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000000694 effects Effects 0.000 title claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 30
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 29
- 239000010703 silicon Substances 0.000 claims abstract description 29
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 26
- 239000000758 substrate Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000243 solution Substances 0.000 claims description 40
- 239000010409 thin film Substances 0.000 claims description 24
- 239000012528 membrane Substances 0.000 claims description 23
- 239000002356 single layer Substances 0.000 claims description 23
- 229950000845 politef Drugs 0.000 claims description 22
- 230000001476 alcoholic effect Effects 0.000 claims description 21
- 238000005259 measurement Methods 0.000 claims description 21
- 150000001336 alkenes Chemical class 0.000 claims description 5
- 239000012086 standard solution Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 235000013361 beverage Nutrition 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- -1 graphite Alkene Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 238000001237 Raman spectrum Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000013334 alcoholic beverage Nutrition 0.000 description 1
- 239000012472 biological sample Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000005865 ionizing radiation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 229940058401 polytetrafluoroethylene Drugs 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000005616 pyroelectricity Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009923 sugaring Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- 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
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
- G01N21/553—Attenuated total reflection and using surface plasmons
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses an apparatus and method for measuring alcohol content by using graphene and PVDF (polyvinylidene fluoride) terahertz plasmon resonance effect; in the apparatus, graphene, PVDF film, silicon dioxide film, alcohol solution to be detected and a high-resistance silicon substrate are arranged sequentially on the lower surface of a high-resistance silicon prism; when a turntable where the silicon prism locates rotates by a certain angle, a turntable where a detector locates rotates by a double angle correspondingly and rotational angles scan-vary in a specific range, the detector may acquire an angle-reflection coefficient curve. Resonant peaks of the angle-reflection coefficient curve move with changes in alcohol content. As a backward wave oscillator has high powder, the turntable where the detector locates has large radius, and the resolution of the rotational angle can be less than 1 minute; in the apparatus, the resonant peaks move at an angle of greater than 16 degrees when solution to be detected varies from pure water to pure alcohol, the precision under which the apparatus measures the alcohol content is up to one thousandth and above.
Description
Technical field
The invention belongs to THz wave technology field, is related to one kind using single-layer graphene and PVDF thin film Terahertz surface
The alcohol concentration measurement apparatus of plasma resonance effect and its method.
Background technology
Terahertz (Terahertz or THz) ripple typically refers to frequency in 0.1～10THz interval electromagnetic wave, its photon
Energy be about 1～10meV, just the energy of transition is roughly the same between molecular vibration and rotational energy level.Most of polarity
Molecule such as hydrone, amino molecule etc. have strong absorption, the vibration of many organic macromolecules (DNA, protein etc.) to THz radiation
Transition between energy level and rotational energy level is also just in THz wavelength bands.Therefore, the THz spectrum of material are (including transmitting, reflection
And transmitted spectrum) including abundant physics matter and chemical information, it absorbs and dispersion characteristics can be used to do explosive, medicine
Deng the detection and identification of chemistry and biological sample, in physicss, chemistry, biomedicine, astronomy, material science and environmental science
Etc. aspect have important using value.
Graphene is a kind of two-dimensional material of six side comb shapes of only monolayer carbon atomic thickness, found from 2004 with
Come, increasingly paid attention to by people, with being extremely widely applied prospect.Graphene is (200 times of intensity highest material in the world
In steel), there are very high heat conduction (5300W/mK) and electric conductivity (50 Ω/cm), there is high specific surface area (2630m2/ g), there is height
Elastic high rigidity (130GPa).The chemical reactivity of Graphene is strong, easily forms compound with other chemical reactions, moreover it is possible to
Ionizing radiation is born, while very slim and graceful, with the toughness similar to carbon fiber, and Joule effect is less than carbon fiber.Graphene
Support surface plasmon is can be very good in THz wave bands, there are many potential applications at aspects such as sensing, communications.
PVDF is the copolymer of fluorine-containing vinyl monomer, and it has the characteristic of fluororesin and resins for universal use concurrently, except with good
Chemical resistance, heat-resisting quantity, oxidative resistance, weatherability, outside resistance to x radiation x performance, also with piezoelectricity, dielectricity,
The properties such as pyroelectricity.PVDF has four kinds of polymorphic structures：α, β, γ, δ phase, wherein β phases are electric polarity forms, with higher
Piezoelectric property.Particularly the THz dielectric properties of the PVDF of β phases can be described with Drude models, and its plasma frequency is located at THz
Frequency range so that can excite THz surface plasmons at medium-PVDF interfaces, have important application in sensory field.
Solution concentration is an important physical amount, in chemical industry, metallurgy, papermaking, wine brewing, sugaring, environmental protection industry (epi) and scientific research etc.
Field all usually needs to measure solution concentration.It is state control product to be wherein particularly alcoholic beverages, to therein
There are strict requirements for ethanol content.Rapidly and accurately determine ethanol content in beverage particularly significant in food industry quality control.
The optical parametrics such as refractive index and the absorbance due to solution are directly related with its concentration and temperature therefore by measuring the light of solution
Parameter is learned to measure solution concentration be one of conventional method, such as Fibre Optical Sensor, infrared and Raman spectrometry etc..Together
Membrance separation is compared with reference to the electrochemistry method such as enzyme process, this kind of fast with measuring speed, and high precision is especially suitable for inflammable and explosive etc.
Place measures.Near-infrared, mid-infrared and Raman spectrum have been applied to the measurement of ethanol content in beverage, but build in measuring method
Vertical initial stage, needs complete high-volume experiment to set up chemometric model.And model is more with light intensity signal or and intensity
Measured perception is realized in the change of directly related amount, and the stability requirement to light source is high, and calculates complicated.
The content of the invention
The present invention seeks to overcome the shortcomings of alcohol concentration in existing electrochemical process and spectroscopy measurements beverage, provide first
A kind of alcohol concentration measurement apparatus of utilization single-layer graphene and PVDF thin film Terahertz surface plasma resonance effect.Institute
The alcohol concentration measurement apparatus stated include that semicircle silicon prism (1), single-layer graphene (2), PVDF thin film (3), silicon dioxide are thin
Film (4), alcoholic solution to be measured (5), HR-Si substrate (6), the first turntable (7), backward wave oscillator (8), the first polytetrafluoroethyl-ne
Alkene lens (9), the second politef lens (10), the 3rd politef lens (11)；4th politef lens
(12)；Schottky diode detector (13), the second turntable (14)；
Semicircle silicon prism (1) lower surface is close to arrange that single-layer graphene (2), PVDF thin film (3), silicon dioxide are thin successively
Film (4), alcoholic solution to be measured (5) and HR-Si substrate (6), the THz ripples sent by backward wave oscillator (8) pass through the first polytetrafluoro
Ethylene lens (9), the second politef lens (10) focus on semicircle silicon prism (1), then through semicircle silicon prism (1)
And single-layer graphene (2), PVDF thin film (3), silica membrane (4), the wine to be measured for being close to be placed on HR-Si substrate (6)
Outgoing semicircle silicon prism (1) after smart solution (5) reflection, then through the 3rd politef lens (11), the 4th polytetrafluoroethyl-ne
Alkene lens (12) reach schottky diode detector (13)；
Semicircle silicon prism (1), single-layer graphene (2), PVDF thin film (3), silica membrane (4), ethanol to be measured are molten
Liquid (5), HR-Si substrate (6) are on the first turntable (7)；Schottky diode detector (13) is installed in the second rotation
On platform (14).
Present invention also offers a kind of alcohol concentration measuring method, its step is as follows：
1) alcoholic solution to be measured (5) is placed respectively between HR-Si substrate (6) and silica membrane (4) first；
2) THz wave that backward wave oscillator (8) sends is operated in 0.65THz, through silicon prism (1) and mono-layer graphite
Alkene (2), PVDF thin film (3), silica membrane (4), the wine to be measured of the variable concentrations for being close to be placed on HR-Si substrate (6)
Schottky diode detector (13), the first turntable (7) the rotational angle θ that prism is located, Xiao are reached after smart solution (5) reflection
The second turntable (14) that special based diode detector (13) is located rotates 2 θ；θ 20 to 80 degree scanning when, the step of angle scanning
It is long to be less than 1 point, form angle-reflection coefficient curve.
3) angle-reflection coefficient measured according to the alcoholic solution to be measured of unknown concentration, calculates resonance peak position；And generation
Enter the Exact concentrations that standard solubility-resonance peak measurement calibration trace obtains alcoholic solution to be measured.
Standard solubility-resonance peak measurement calibration trace is obtained as follows：
1) place respectively between HR-Si substrate (6) and silica membrane (4) first pure water, 5%, 10%, 15%,
20%th, 25%, 30%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%,
90%th, 95%, 100% proof-spirit solution；
2) THz wave that backward wave oscillator (8) sends is operated in 0.65THz, through silicon prism (1) and mono-layer graphite
Alkene (2), PVDF thin film (3), silica membrane (4), the wine to be measured of the variable concentrations for being close to be placed on HR-Si substrate (6)
Schottky diode detector (13), the first turntable (7) the rotational angle θ that prism is located, Xiao are reached after smart solution (5) reflection
The second turntable (14) that special based diode detector (13) is located rotates 2 θ；θ 20 to 80 degree scanning when, the step of angle scanning
It is long to be less than 1 point, form angle-reflection coefficient curve.
3) after the angle-reflection coefficient curve for measuring all standard solution, resonance peak position and and solution concentration are calculated
Data set up together standard solubility-resonance peak measurement calibration trace, from pure water to absolute alcohol change procedure in, reflection coefficient curve
On resonance peak move more than 16 degree, the step-length of angle scanning is less than 1 point so that measure alcohol concentration precision reach 0.1% with
On.
Description of the drawings
The alcohol concentration measurement dress of a kind of utilization Graphenes of Fig. 1 and PVDF thin film Terahertz surface plasma resonance effect
Put structural representation；
Terahertz reflection coefficient when Fig. 2 measurement pure water, 20%, 40%, 60%, 80%, 100% proof-spirit solution
Curve；
Fig. 3. measurement pure water, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% standard
Reflection coefficient resonance angle curve and its matched curve during alcoholic solution.
In figure：Semicircle silicon prism 1, single-layer graphene 2, PVDF thin film 3, silica membrane 4, alcoholic solution to be measured 5,
HR-Si substrate 6, the first turntable 7, backward wave oscillator 8, the first politef lens 9, the second politef lens 10,
3rd politef lens 11, the 4th politef lens 12, schottky diode detector 13, the second turntable 14；
Specific embodiment
As shown in figure 1, in a kind of utilization single-layer graphene and PVDF thin film Terahertz surface plasma resonance effect
Alcohol concentration measurement apparatus include semicircle silicon prism 1, single-layer graphene 2, PVDF thin film 3, silica membrane 4, wine to be measured
Smart solution 5, HR-Si substrate 6, the first turntable 7, backward wave oscillator 8, the first politef lens 9, the second polytetrafluoroethyl-ne
Alkene lens 10, the 3rd politef lens 11；4th politef lens 12；Schottky diode detector 13, second
Turntable 14；
The semicircle lower surface of silicon prism 1 is close to arrange single-layer graphene 2, PVDF thin film 3 successively, silica membrane 4, is treated
Alcoholic solution 5 and HR-Si substrate 6 are surveyed, the THz ripples sent by backward wave oscillator 8 pass through the first politef lens 9, second
Politef lens 10 focus on semicircle silicon prism 1, then through semicircle silicon prism 1 and single-layer graphene 2, PVDF thin film
3rd, silica membrane 4, outgoing semicircle silicon prism after being reflected by the alcoholic solution to be measured 5 being close to be placed on HR-Si substrate 6
1, then reach schottky diode detector 13 through the 3rd politef lens 11, the 4th politef lens 12；
Semicircle silicon prism 1, single-layer graphene 2, PVDF thin film 3, silica membrane 4, alcoholic solution to be measured 5, high resistant
Silicon substrate 6 is arranged on the first turntable 7；Schottky diode detector 13 is arranged on the second turntable 14.
Measuring process is as follows：
1) alcoholic solution 5 to be measured is placed respectively first between HR-Si substrate 6 and silica membrane 4；
2) THz wave that backward wave oscillator 8 sends is operated in 0.65THz, through silicon prism 1 and single-layer graphene 2,
PVDF thin film 3, silica membrane 4, the alcoholic solution to be measured 5 of the variable concentrations for being close to be placed on HR-Si substrate 6 reflects
Schottky diode detector 13, the rotational angle θ of the first turntable 7 that prism is located, schottky diode detector are reached afterwards
13 the second turntables 14 being located rotate 2 θ；In 20 to 80 degree scanning, the step-length of angle scanning is less than 1 point to θ, formed angle-
Reflection coefficient curve.
3) angle-reflection coefficient measured according to the alcoholic solution to be measured of unknown concentration, calculates resonance peak position；And generation
Enter the Exact concentrations that standard solubility-resonance peak measurement calibration trace obtains alcoholic solution to be measured.
Standard solubility-resonance peak measurement calibration trace is obtained as follows：
1) place respectively first between HR-Si substrate 6 and silica membrane 4 pure water, 5%, 10%, 15%,
20%th, 25%, 30%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%,
90%th, 95%, 100% proof-spirit solution；
2) THz wave that backward wave oscillator 8 sends is operated in 0.65THz, through silicon prism 1 and single-layer graphene 2,
PVDF thin film 3, silica membrane 4, the alcoholic solution to be measured 5 of the variable concentrations for being close to be placed on HR-Si substrate 6 reflects
Schottky diode detector 13, the rotational angle θ of the first turntable 7 that prism is located, schottky diode detector are reached afterwards
13 the second turntables 14 being located rotate 2 θ；In 20 to 80 degree scanning, the step-length of angle scanning is less than 1 point to θ, formed angle-
Reflection coefficient curve.
3) after the angle-reflection coefficient curve for measuring all standard solution, resonance peak position and and solution concentration are calculated
Data set up together standard solubility-resonance peak measurement calibration trace, from pure water to absolute alcohol change procedure in, reflection coefficient curve
On resonance peak move more than 16 degree, the step-length of angle scanning is less than 1 point so that measure alcohol concentration precision reach 0.1% with
On.
Claims (3)
1. a kind of alcohol concentration measurement apparatus of utilization Graphene and PVDF Terahertz plasma resonant vibration effects, it is characterised in that bag
Include semicircle silicon prism (1), single-layer graphene (2), PVDF thin film (3), silica membrane (4), alcoholic solution to be measured (5),
HR-Si substrate (6), the first turntable (7), backward wave oscillator (8), the first politef lens (9), the second polytetrafluoroethyl-ne
Alkene lens (10), the 3rd politef lens (11)；4th politef lens (12)；Schottky diode detector
(13), the second turntable (14)；
Semicircle silicon prism (1) lower surface is close to arrange single-layer graphene (2), PVDF thin film (3), silica membrane successively
(4), alcoholic solution (5) to be measured and HR-Si substrate (6), the THz ripples sent by backward wave oscillator (8) pass through the first polytetrafluoroethyl-ne
Alkene lens (9), the second politef lens (10) focus on semicircle silicon prism (1), then through semicircle silicon prism (1) and
Single-layer graphene (2), PVDF thin film (3), silica membrane (4), the ethanol to be measured for being close to be placed on HR-Si substrate (6)
Outgoing semicircle silicon prism (1) after solution (5) reflection, then through the 3rd politef lens (11), the 4th politef
Lens (12) reach schottky diode detector (13)；
Semicircle silicon prism (1), single-layer graphene (2), PVDF thin film (3), silica membrane (4), alcoholic solution to be measured
(5), HR-Si substrate (6) is on the first turntable (7)；Schottky diode detector (13) is installed in the second turntable
(14) on.
2. a kind of alcohol concentration measuring method using device as claimed in claim 1, it is characterised in that its measuring process is such as
Under：
1) alcoholic solution to be measured (5) is placed respectively between HR-Si substrate (6) and silica membrane (4) first；
2) THz wave that backward wave oscillator (8) sends is operated in 0.65THz, through silicon prism (1) and single-layer graphene
(2), PVDF thin film (3), silica membrane (4), the ethanol to be measured of the variable concentrations for being close to be placed on HR-Si substrate (6)
Schottky diode detector (13), the first turntable (7) rotational angle θ, Xiao Te that prism is located are reached after solution (5) reflection
The second turntable (14) that based diode detector (13) is located rotates 2 θ；θ 20 to 80 degree scanning when, the step-length of angle scanning
Less than 1 point, angle-reflection coefficient curve is formed.
3) angle-reflection coefficient measured according to the alcoholic solution to be measured of unknown concentration, calculates resonance peak position；And substitute into mark
Quasi- solubility-resonance peak measurement calibration trace obtains the Exact concentrations of alcoholic solution to be measured.
3. method as claimed in claim 2, it is characterised in that described standard solubility-resonance peak measurement calibration trace is by such as
Lower step is obtained：
1) place respectively between HR-Si substrate (6) and silica membrane (4) first pure water, 5%, 10%, 15%,
20%th, 25%, 30%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%,
90%th, 95%, 100% proof-spirit solution；
2) THz wave that backward wave oscillator (8) sends is operated in 0.65THz, through silicon prism (1) and single-layer graphene
(2), PVDF thin film (3), silica membrane (4), the ethanol to be measured of the variable concentrations for being close to be placed on HR-Si substrate (6)
Schottky diode detector (13), the first turntable (7) rotational angle θ, Xiao Te that prism is located are reached after solution (5) reflection
The second turntable (14) that based diode detector (13) is located rotates 2 θ；θ 20 to 80 degree scanning when, the step-length of angle scanning
Less than 1 point, angle-reflection coefficient curve is formed.
3) after the angle-reflection coefficient curve for measuring all standard solution, calculate resonance peak position and with solution concentration data
Set up standard solubility-resonance peak measurement calibration trace together, from pure water to absolute alcohol change procedure in, in reflection coefficient curve
Resonance peak moves more than 16 degree, and the step-length of angle scanning is less than 1 point so that measurement alcohol concentration precision reaches more than 0.1%.
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| CN201611123623.3A CN106596475B (en) | 2016-12-08 | 2016-12-08 | Alcohol concentration measuring device and method using graphene and PVDF terahertz plasma resonance effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324345A (en) * | 2021-11-01 | 2022-04-12 | 清华大学深圳国际研究生院 | Material imaging method and device, terminal equipment and storage medium |
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