CN106483104A - Alcohol concentration measurement apparatus and method using PVDF Terahertz plasma resonance effect - Google Patents
Alcohol concentration measurement apparatus and method using PVDF Terahertz plasma resonance effect Download PDFInfo
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- CN106483104A CN106483104A CN201611125163.8A CN201611125163A CN106483104A CN 106483104 A CN106483104 A CN 106483104A CN 201611125163 A CN201611125163 A CN 201611125163A CN 106483104 A CN106483104 A CN 106483104A
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000002033 PVDF binder Substances 0.000 title claims abstract description 35
- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims abstract description 35
- 238000005259 measurement Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000000694 effects Effects 0.000 title claims abstract description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 32
- 239000010703 silicon Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 87
- 239000000243 solution Substances 0.000 claims description 45
- 239000000377 silicon dioxide Substances 0.000 claims description 42
- 239000012528 membrane Substances 0.000 claims description 41
- 239000010409 thin film Substances 0.000 claims description 30
- 230000001476 alcoholic effect Effects 0.000 claims description 28
- 229950000845 politef Drugs 0.000 claims description 25
- 239000000758 substrate Substances 0.000 claims description 25
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000010408 film Substances 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 239000012086 standard solution Substances 0.000 claims description 3
- 241000790917 Dioxys <bee> Species 0.000 claims description 2
- 229910003978 SiClx Inorganic materials 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 235000013361 beverage Nutrition 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000000463 material Substances 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
- 238000002835 absorbance Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000013334 alcoholic beverage Nutrition 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000012472 biological sample Substances 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
- 238000010586 diagram 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
- 230000005621 ferroelectricity Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine 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
- VDGJOQCBCPGFFD-UHFFFAOYSA-N oxygen(2-) silicon(4+) titanium(4+) Chemical compound [Si+4].[O-2].[O-2].[Ti+4] VDGJOQCBCPGFFD-UHFFFAOYSA-N 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
- 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
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000009923 sugaring Methods 0.000 description 1
- 238000012360 testing method 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
Landscapes
- 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 a kind of alcohol concentration measurement apparatus of utilization PVDF Terahertz plasma resonance effect and method.Single-frequency Terahertz (THz) ripple being sent by backward wave oscillator reaches schottky diode detector after silicon prismatic reflection.When the turntable that silicon prism is located rotates to an angle and detector place turntable rotates corresponding twice angle, and the anglec of rotation is in particular range during scan variations, and detector can get angle reflection coefficient curve.Resonance peak in this reflection coefficient curve changes movement with alcohol concentration.Because the power of backward wave oscillator is larger, make the radius of detector place turntable larger, anglec of rotation resolution is allow to be less than one point, when in this measurement apparatus, solution to be measured changes from pure water to absolute alcohol, the resonance peak of angle reflection coefficient curve is mobile is more than 18 degree so that the precision that this measurement apparatus measures alcohol concentration reaches more than one thousandth.
Description
Technical field
The invention belongs to THz wave technology field, it is related to one kind and utilizes Kynoar (PVDF) thin film Terahertz surface
The alcohol concentration measurement apparatus of plasma resonance effect.
Background technology
Terahertz (Terahertz or THz) ripple typically refers to frequency in the interval electromagnetic wave of 0.1～10THz, its photon
Energy be about 1～10meV, just the energy of transition is roughly the same and molecular vibration and rotational energy level between.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 band.Therefore, the THz spectrum of material (includes 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 detection and the identification of chemistry and biological sample, in physicss, chemistry, biomedicine, astronomy, material science and environmental science
Etc. aspect there is important using value.
PVDF is the copolymer of fluorine-containing vinyl monomer, and it has the characteristic of fluororesin and resins for universal use concurrently, good except having
Chemical resistance, heat-resisting quantity, oxidative resistance, weatherability, outside resistance to x radiation x performance, also have piezoelectricity, ferroelectricity,
The properties such as pyroelectricity.PVDF has four kinds of polymorphic structures：α, β, γ, δ phase, wherein β phase are electric polarity forms, have higher
Piezoelectric property.Particularly the THz dielectric properties of the PVDF of β phase can be located at THz with the description of Drude model, its plasma frequency
Frequency range, so that can excite THz surface plasmons at medium PVDF interface, has 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 solution concentration is measured.Wherein particularly alcoholic beverages are state control products, to therein
There are strict requirements for ethanol content.Rapidly and accurately measure ethanol content in beverage particularly significant in food industry quality control.
Therefore pass through to measure the light of solution because the refractive index of solution is directly related with its concentration and temperature with optical parametrics such as absorbances
Learn parameter to measure solution concentration be one of conventional method, for example Fibre Optical Sensor, infrared and Raman spectrometry etc..With
Membrance separation is compared with reference to the electrochemistry method such as enzyme process, and this kind of have measuring speed soon, 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
At the vertical initial stage, need to complete in high volume to test to set up chemometric model.And how model is 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 complexity.
Content of the invention
The present invention seeks to overcoming the shortcomings of alcohol concentration in existing electrochemical process and spectroscopy measurements beverage, provide one kind
Alcohol concentration measurement apparatus and its method using Terahertz anisotropic media resonance effect.
The alcohol concentration measurement apparatus of the utilization PVDF Terahertz plasma resonance effect of the present invention include semicircle silicon
Prism (1), the first silica membrane (2), PVDF thin film (3), the second 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 be close to successively to arrange the first silica membrane (2), PVDF thin film (3), second
Silica membrane (4), alcoholic solution to be measured (5) and HR-Si substrate (6), are passed through by the THz ripple that backward wave oscillator (8) sends
First politef lens (9), the second politef lens (10) focus on semicircle silicon prism (1), then through semicircle
Shape silicon prism (1) and the first silica membrane (2), PVDF thin film (3), the second silica membrane (4), are close to be placed in height
Outgoing semicircle silicon prism (1) after alcoholic solution to be measured (5) reflection in resistance silicon substrate (6), then pass through the 3rd politef
Lens (11), the 4th politef lens (12) reach schottky diode detector (13)；
Semicircle silicon prism (1), the first silica membrane (2), PVDF thin film (3), the second silica membrane (4),
Alcoholic solution (5) to be measured, HR-Si substrate (6) are arranged on the first turntable (7)；Schottky diode detector (13) is installed
On the second turntable (14).
The thickness of the first silica membrane (2) and the second silica membrane (4) is 10 microns, the thickness of PVDF thin film
Spend for 30 microns, the thickness of alcoholic solution is 200 microns.
Alcohol concentration measuring process to be measured is as follows：
1) place alcoholic solution to be measured respectively between HR-Si substrate (6) and the second silica membrane (4) first；
2) THz wave that backward wave oscillator (8) sends is operated in 0.65THz, through semicircle silicon prism (1) and the
One silica membrane (2), PVDF thin film (3), the second silica membrane (4), are close to be placed on HR-Si substrate (6)
Schottky diode detector (13) is reached, the first turntable (7) angle of rotation that prism is located after alcoholic solution (5) reflection to be measured
Degree θ, the second turntable (14) that schottky diode detector (13) is located rotates 2 θ；θ in 20 to 80 degree scanning, sweep by angle
The step-length retouched is less than 1 point, angulation reflection coefficient curve.
3) the angle reflection coefficient being recorded according to the alcoholic solution to be measured of unknown concentration, calculates resonance peak position；And generation
Enter standard solubility-resonance peak and measure the Exact concentrations that calibration trace obtains alcoholic solution to be measured.
Standard solubility-resonance peak measurement calibration trace obtains as follows：
1) place respectively between HR-Si substrate (6) and the second silica membrane (4) first pure water, 5%, 10%,
15%th, 20%, 25%, 30%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%,
85%th, 90%, 95%, 100% proof-spirit solution；
2) THz wave that backward wave oscillator (8) sends is operated in 0.65THz, through silicon prism (1) and the first dioxy
SiClx thin film (2), PVDF thin film (3), the second silica membrane (4), are close to be placed in difference on HR-Si substrate (6) dense
Schottky diode detector (13) is reached, the first turntable (7) that prism is located turns after proof-spirit solution (5) reflection of degree
Dynamic angle, θ, the second turntable (14) that schottky diode detector (13) is located rotates 2 θ；θ 20 to 80 degree scanning when, angle
The step-length of degree scanning is less than 1 point, angulation reflection coefficient curve.
3) after the angle reflection coefficient curve measuring all standard solution, resonance peak position and solution concentration are calculated
Data Criterion solubility-resonance peak measurement calibration trace together, from pure water to absolute alcohol change procedure, reflection coefficient curve
On mobile more than 18 degree of resonance peak, the step-length of angle scanning be less than 1 point so that measure alcohol concentration precision reach 0.1% with
On.
Single-frequency Terahertz (THz) ripple being sent by backward wave oscillator reaches Schottky diode after silicon prismatic reflection
Detector.When the turntable that silicon prism is located rotates to an angle and the detector place turntable corresponding twice angle of rotation,
And in particular range during scan variations, detector can get angle reflection coefficient curve to the anglec of rotation.This reflection coefficient is bent
Resonance peak on line changes movement with alcohol concentration.Due to the power of backward wave oscillator larger so that detector place turntable
Radius larger so that anglec of rotation resolution can be less than one point, in this measurement apparatus, solution to be measured is from pure water to absolute alcohol
During change, the resonance peak of angle reflection coefficient curve is mobile is more than 18 degree so that this measurement apparatus measures the precision of alcohol concentration
Reach more than one thousandth.
Brief description
A kind of alcohol concentration using Kynoar (PVDF) thin film Terahertz surface plasma resonance effect of Fig. 1 is surveyed
Amount apparatus structure schematic diagram；
Fig. 2 measures Terahertz reflection coefficient when 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
Resonance angle and its matched curve in reflection coefficient curve during alcoholic solution.
In figure：Semicircle silicon prism 1, the first silica membrane 2, PVDF thin film 3, the second silica membrane 4, to be measured
Alcoholic solution 5, HR-Si substrate 6, the first turntable 7, backward wave oscillator 8, the first politef lens 9, the second polytetrafluoro
Ethylene lens 10, the 3rd politef lens 11, the 4th politef lens 12, schottky diode detector 13,
Two turntables 14.
Specific embodiment
As shown in figure 1, a kind of alcohol concentration measurement apparatus of utilization PVDF Terahertz plasma resonance effect, including half
Circular silicon prism 1, the first silica membrane 2, PVDF thin film 3, the second silica membrane 4, alcoholic solution to be measured 5, high resistant
Silicon substrate 6, the first turntable 7, backward wave oscillator 8, the first politef lens 9, the second politef lens the 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 the first silica membrane 2, PVDF thin film 3, the second titanium dioxide successively
Silicon thin film 4, alcoholic solution to be measured 5 and HR-Si substrate 6, the THz ripple being sent by backward wave oscillator 8 passes through the first politef
Lens 9, the second politef lens 10 focus on semicircle silicon prism 1, then through semicircle silicon prism 1 and the first titanium dioxide
Silicon thin film 2, PVDF thin film 3, the second silica membrane 4, are close to be placed in alcoholic solution to be measured 5 on HR-Si substrate 6 anti-
Penetrate rear outgoing semicircle silicon prism 1, then reach Xiao Te through the 3rd politef lens 11, the 4th politef lens 12
Based diode detector 13；
Semicircle silicon prism 1, the first silica membrane 2, PVDF thin film 3, the second silica membrane 4, ethanol to be measured
Solution 5, HR-Si substrate 6 are arranged on the first turntable 7；Schottky diode detector 13 is arranged on the second turntable 14
On.
The thickness of the first silica membrane 2 and the second silica membrane 4 is 10 microns, and the thickness of PVDF thin film is
30 microns, the thickness of alcoholic solution is 200 microns.
Measuring process is as follows：
1) place alcoholic solution to be measured respectively between HR-Si substrate 6 and the second silica membrane 4 first；
2) THz wave that backward wave oscillator 8 sends is operated in 0.65THz, through semicircle silicon prism 1 and the 1st
Silicon oxide film 2, PVDF thin film 3, the second silica membrane 4, are close to be placed in alcoholic solution to be measured on HR-Si substrate 6
Schottky diode detector 13 is reached after 5 reflections, the first turntable 7 rotational angle θ that prism is located, Schottky diode is visited
Survey the second turntable 14 rotation 2 θ that device 13 is located；In 20 to 80 degree scanning, the step-length of angle scanning is less than 1 point to θ, forms angle
Degree reflection coefficient curve.
The 3 angle reflection coefficients being recorded according to the alcoholic solution to be measured of unknown concentration, calculate resonance peak position；And substitute into
Standard solubility-resonance peak measures the Exact concentrations that calibration trace obtains alcoholic solution to be measured.
Standard solubility-resonance peak measurement calibration trace obtains as follows：
1) place respectively between HR-Si substrate 6 and the second 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 the first silicon dioxide
Thin film 2, PVDF thin film 3, the second silica membrane 4, the proof-spirit of the variable concentrations being close to be placed on HR-Si substrate 6
Schottky diode detector 13 is reached after solution 5 reflection, the first turntable 7 rotational angle θ that prism is located, Schottky two pole
The second turntable 14 that pipe detector 13 is located rotates 2 θ；In 20 to 80 degree scanning, the step-length of angle scanning is less than 1 point to θ, shape
Angled reflection coefficient curve, as shown in Figure 2.
3) after the angle reflection coefficient curve measuring all standard solution, resonance peak position and solution concentration are calculated
Data Criterion solubility-resonance peak measurement calibration trace (as shown in Figure 3) together, from pure water to absolute alcohol change procedure,
Mobile more than 18 degree of resonance peak in reflection coefficient curve, the step-length of angle scanning is less than 1 point so that measuring alcohol concentration precision
Reach more than 0.1%.
Claims (4)
1. a kind of alcohol concentration measurement apparatus of utilization PVDF Terahertz plasma resonance effect are it is characterised in that include semicircle
Shape silicon prism (1), the first silica membrane (2), PVDF thin film (3), the second 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), second poly- four
Fluorothene lens (10), the 3rd politef lens (11)；4th politef lens (12)；Schottky diode detects
Device (13), the second turntable (14)；
Semicircle silicon prism (1) lower surface is close to arrange the first silica membrane (2), PVDF thin film (3), the second dioxy successively
SiClx thin film (4), alcoholic solution to be measured (5) and HR-Si substrate (6), pass through first by the THz ripple that backward wave oscillator (8) sends
Politef lens (9), the second politef lens (10) focus on semicircle silicon prism (1), then through semicircle silicon
Prism (1) and the first silica membrane (2), PVDF thin film (3), the second silica membrane (4), are close to be placed in High Resistivity Si
Go out radiosilicon prism (1) after alcoholic solution to be measured (5) reflection on substrate (6), then through the 3rd politef lens (11), the
Four politef lens (12) reach schottky diode detector (13)；
Semicircle silicon prism (1), the first silica membrane (2), PVDF thin film (3), the second silica membrane (4), to be measured
Alcoholic solution (5), HR-Si substrate (6) are arranged on the first turntable (7)；Schottky diode detector (13) is arranged on
On two turntables (14).
2. device according to claim 1 is it is characterised in that described the first silica membrane (2) and the second titanium dioxide
The thickness of silicon thin film (4) is 10 microns, and the thickness of PVDF thin film is 30 microns, and the thickness of alcoholic solution is 200 microns.
3. a kind of wine utilizing PVDF Terahertz plasma resonance effect using device as claimed in claim 1 using Terahertz
Smart concentration measuring method is it is characterised in that its measuring process is as follows：
1) place alcoholic solution to be measured respectively between HR-Si substrate (6) and the second silica membrane (4) first；
2) THz wave that backward wave oscillator (8) sends is operated in 0.65THz, through semicircle silicon prism (1) and the one or two
Silicon oxide film (2), PVDF thin film (3), the second silica membrane (4), to be measured on HR-Si substrate (6) by being close to be placed in
Schottky diode detector (13) is reached after alcoholic solution (5) reflection, the first turntable (7) the rotational angle θ that prism is located,
The second turntable (14) that schottky diode detector (13) is located rotates 2 θ；θ 20 to 80 degree scanning when, angle scanning
Step-length is less than 1 point, angulation reflection coefficient curve；
3) the angle reflection coefficient being recorded according to the alcoholic solution to be measured of unknown concentration, calculates resonance peak position；And substitute into mark
Quasi- solubility-resonance peak measures the Exact concentrations that calibration trace obtains alcoholic solution to be measured.
4. method as claimed in claim 3 is it is characterised in that described standard solubility-resonance peak measurement calibration trace passes through such as
Lower step obtains：
1) place respectively between HR-Si substrate (6) and the second 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 semicircle silicon prism (1) and the one or two
Silicon oxide film (2), PVDF thin film (3), the second silica membrane (4), are close to be placed in difference on HR-Si substrate (6)
Schottky diode detector (13) is reached, the first turntable (7) that prism is located after proof-spirit solution (5) reflection of concentration
Rotational angle θ, the second turntable (14) that schottky diode detector (13) is located rotates 2 θ；θ 20 to 80 degree scanning when,
The step-length of angle scanning is less than 1 point, angulation reflection coefficient curve.
3) measure all standard solution angle reflection coefficient curve after, calculate resonance peak position and with solution concentration data
Criterion solubility-resonance peak measurement calibration trace together, from pure water to absolute alcohol change procedure, in reflection coefficient curve
Mobile more than 18 degree of resonance peak, 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112014913A (en) * | 2020-09-07 | 2020-12-01 | 中国计量大学 | Terahertz artificial surface plasma excitation device and gas detection device |
| 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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