CN102830069B - Alcohol concentration measuring device by using terahertz anisotropic medium resonance effect and method thereof - Google Patents
Alcohol concentration measuring device by using terahertz anisotropic medium resonance effect and method thereof Download PDFInfo
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- CN102830069B CN102830069B CN201210292860.8A CN201210292860A CN102830069B CN 102830069 B CN102830069 B CN 102830069B CN 201210292860 A CN201210292860 A CN 201210292860A CN 102830069 B CN102830069 B CN 102830069B
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Abstract
The invention discloses an alcohol concentration measuring device by using terahertz anisotropic medium resonance effect and a method thereof. The terahertz anisotropic medium in the invention is formed by arranging two layers of metal resonance ring arrays on upper and lower surfaces of a polyimide substrate. An alcohol solution to be measured is disposed on the metal resonance ring array at one side of the anisotropic medium; terahertz waves sent by a backward wave oscillator vertically enter the metal resonance ring array at the other side; when the terahertz waves scan and change within a certain frequency range, a double-layer metal resonance ring array reflection coefficient curve is obtained by detection by two schottky diode detectors. The resonance effect of the metal resonance rings allows the resonance peaks on the reflection coefficient curve to move with the change of the alcohol concentration. The frequency spectrum resolution of the backward wave oscillator is less than 5 MHz, and the resonance peak movement in the reflection coefficient curve is more than 25 GHz when the solution to be measured changes from pure water to pure alcohol, so the precision of the measuring device for measuring alcohol concentration is up to more than 0.02%.
Description
Technical field
The invention belongs to THz wave technical field, relate to a kind of alcohol concentration measurement mechanism and method thereof of utilizing Terahertz anisotropic media resonance effect.
Background technology
Terahertz (Terahertz or THz, 1THz=10
12hz) ripple typically refers to the electromagnetic wave of frequency in 0.1～10THz interval, and the energy of its photon is about 1～10meV, just in time with molecular vibration and rotational energy level between the energy of transition roughly suitable.Most of polar molecules have strong absorption to terahertz emission as hydrone, amino molecule etc., and the transition between vibrational energy level and the rotational energy level of many organic macromolecules (DNA, protein etc.) is also just in time at THz wave segment limit.Therefore, the tera-hertz spectra (comprising transmitting, reflection and transmitted spectrum) of material includes abundant physics matter and chemical information, its absorption and dispersion characteristics can be used for doing the detecting and identifying of the chemistry such as explosive, medicine and biological sample, have important using value at aspects such as physics, chemistry, biomedicine, uranology, material science and environmental sciences.
In recent years, with left-handed materials (Left_Handed_Material, be called for short LHM) or be called the metamaterial that material with negative refractive index (Negative Refractive Index Material, be called for short NIM) is representative and become one of hot subject of the area researches such as electromagnetics, optoelectronics and material science.The various marvellous characteristic of metamaterial is thought by academia, has not only reformed basic physical theory as negative refraction, electromagnetic focusing effect etc., has huge potential application foreground simultaneously.In the metamaterial by resonant ring or resonance bar construction, electromagnetic wave, at specific band and material generation resonance, forms harmonic peak in the transmittance graph along frequency change.And metamaterial just may possess " left hand " characteristic at the residing frequency band of harmonic peak.Such as common split ring resonator array has very high quality factor, near the arrowband of electromagnetic wave resonance frequency propagated, and excited magnetic dipole, produce equivalent negative magnetoconductivity during much smaller than wavelength in split ring resonator unit size.The electromagnetic field local enhancement that opening resonance loop structure has and high quality factor feature, can be used as sensor and use.
Solution concentration is an important physical amount, all usually needs solution concentration to measure in fields such as chemical industry, metallurgy, papermaking, wine brewing, sugaring, environmental protection industry (epi) and scientific researches.Wherein particularly alcoholic beverages is state control product, and to ethanol content wherein, there are strict requirements.Measure rapidly and accurately in drink ethanol content very important in food industry quality control.Because the optical parametrics such as the refractive index of solution and absorptivity are directly related with its concentration and temperature, therefore by measuring the optical parametric of solution, to measure solution concentration be one of conventional method, for example Fibre Optical Sensor, infrared and Raman spectrum mensuration etc.The electrochemical method such as enzyme process measurement that separates combination with film is compared, and it is fast that this class has measuring speed, and precision is high, is especially applicable to the inflammable and explosive place measurement that waits.Near infrared, in infrared and Raman spectrum be applied to the measurement of ethanol content in drink, but set up the initial stage in measuring method, need to complete experiment in enormous quantities to set up stoichiometry model.And model realizes measured perception mainly with the variation of light intensity signal or the amount directly related with intensity, high to the stability requirement of light source, and calculation of complex.
Summary of the invention
The deficiency that the present invention seeks to overcome existing electrochemical process and spectroscopy measurements alcohol concentration, provides
oneplant alcohol concentration measurement mechanism and the method thereof of utilizing Terahertz anisotropic media resonance effect.
Utilize the alcohol concentration measurement mechanism of Terahertz anisotropic media resonance effect to comprise polyimide substrate, metal resonant ring array, alcoholic solution to be measured, backward wave oscillator, high resistant silicon chip beam splitter, the first teflon lens, the second teflon lens, the first schottky diode detector, the 3rd teflon lens 9 and the second schottky diode detector;
The metal resonant ring structure that polyimide substrate upper surface is arranged, on metal resonant ring array, place the alcoholic solution to be measured of variable concentrations, the metal resonant ring array of polyimide substrate lower surface arrangement, the THz wave of being sent by backward wave oscillator impinges perpendicularly on the metal resonant ring array of lower surface arrangement after high resistant silicon chip beam splitter reflection and the first teflon lens focus, and the THz wave being reflected sees through high resistant silicon chip beam splitter and the second teflon lens arrive the first schottky diode detector; Meanwhile, the THz wave of being sent by backward wave oscillator sees through high resistant silicon chip beam splitter and the 3rd teflon lens arrive the second schottky diode detector.
Utilize the step of alcohol concentration measuring method of Terahertz anisotropic media resonance effect as follows:
1) in the metal resonant ring structure of polyimide substrate upper surface, place respectively pure water, precision in 0.01% above weight percent concentration is: 5%, 10%, 15%, 20%, 25%, 30%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% proof-spirit solution;
2) THz wave that backward wave oscillator sends is in the interscan of 0.35 ~ 0.5THz frequency range, sweep frequency is spaced apart 5MHz, obtains the proof-spirit solution Terahertz reflection coefficient curve of the first schottky diode detector and the ratio of the second schottky diode detector signal;
3) according to proof-spirit solution Terahertz reflection coefficient curve; settle the standard alcoholic solution Terahertz reflection coefficient curve harmonic peak position and with proof-spirit solution concentration Criterion alcoholic solution concentration-harmonic peak measurement update curve; from the proof-spirit solution change procedure of pure water to 100%; more than harmonic peak in proof-spirit solution Terahertz reflection coefficient curve moves and can reach 25GHz, the measurement of concetration precision of proof-spirit solution is reached more than 0.02%;
4) place alcoholic solution to be measured, make THz wave that backward wave oscillator sends in the interscan of 0.35 ~ 0.5THz frequency range, sweep frequency is spaced apart 5MHz, obtains the alcoholic solution Terahertz reflection coefficient curve to be measured of the first schottky diode detector and the ratio of the second schottky diode detector signal;
5) according to alcoholic solution Terahertz reflection coefficient curve to be measured, determine alcoholic solution Terahertz reflection coefficient curve harmonic peak to be measured position, and substitution is by step 1)～step 3) proof-spirit solution concentration-harmonic peak measurement update curve of setting up, obtain the accurate concentration of alcoholic solution to be measured.
The present invention utilizes the resonance effect of Terahertz anisotropic media to measure alcohol concentration in drink, principle is that alcohol concentration is directly corresponding with the refractive index of solution, follow the variations in refractive index of concentration change to cause that the harmonic peak on Terahertz anisotropic media reflection coefficient is moved, thereby accurately measure alcohol content wherein.Because the Terahertz spectral resolution of backward wave oscillator can reach 5MHz, more than moving from pure water to the harmonic peak of absolute alcohol reflection coefficient in this sensor and can reaching 25GHz, measuring accuracy can be reached more than 0.02%.
Brief description of the drawings
A kind of alcohol concentration measurement mechanism structural representation that utilizes Terahertz anisotropic media resonance effect of Fig. 1;
The alcohol concentration sensing device schematic diagram of Fig. 2 Terahertz anisotropic media resonance effect;
Terahertz reflection coefficient curve when Fig. 3 measures pure water, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% proof-spirit solution;
In figure: polyimide substrate 1, metal resonant ring array 2, alcoholic solution to be measured 3, backward wave oscillator 4, high resistant silicon chip beam splitter 5, the first teflon lens 6, the second teflon lens 7, the first schottky diode detector 8, the 3rd teflon lens 9 and the second schottky diode detector 10;
Embodiment
As shown in Figure 1, 2, utilize the alcohol concentration measurement mechanism of Terahertz anisotropic media resonance effect to comprise polyimide substrate 1, metal resonant ring array 2, alcoholic solution to be measured 3, backward wave oscillator 4, high resistant silicon chip beam splitter 5, the first teflon lens 6, the second teflon lens 7, the first schottky diode detector 8, the 3rd teflon lens 9 and the second schottky diode detector 10;
The metal resonant ring structure 2 that polyimide substrate 1 upper surface is arranged, on metal resonant ring array 2, place the alcoholic solution to be measured 3 of variable concentrations, the metal resonant ring array 2 of polyimide substrate 1 lower surface arrangement, the THz wave of being sent by backward wave oscillator 4 reflects through high resistant silicon chip beam splitter 5 the metal resonant ring array 2 that impinges perpendicularly on polyimide substrate 1 lower surface arrangement after focusing on the first teflon lens 6, and the THz wave being reflected sees through high resistant silicon chip beam splitter 5 and the second teflon lens 7 arrive the first schottky diode detector 8; Meanwhile, the THz wave of being sent by backward wave oscillator 4 sees through high resistant silicon chip beam splitter 5 and the 3rd teflon lens 9 arrive the second schottky diode detector 10.
Described resonant ring array 2 adopts copper split ring resonator unit, and copper split ring resonator unit is of a size of 600 microns of cycles, 500 microns of element diameters, 100 microns of live widths, 100 microns of opened gaps, thickness is 18 microns, polyimide substrate thickness is 50 microns.The overall dimension of the Terahertz anisotropic media that the metal resonant ring array that polyimide substrate 1 upper and lower surface is arranged forms is long 1.5 centimetres, wide 1.5 centimetres, thick 86 microns.
Utilize the step of alcohol concentration measuring method of Terahertz anisotropic media resonance effect as follows:
1) in the metal resonant ring structure 2 of polyimide substrate 1 upper surface, place respectively pure water, precision in 0.01% above weight percent concentration is: 5%, 10%, 15%, 20%, 25%, 30%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% proof-spirit solution;
2) THz wave that backward wave oscillator 4 sends is in the interscan of 0.35 ~ 0.5THz frequency range, sweep frequency is spaced apart 5MHz, obtains the proof-spirit solution Terahertz reflection coefficient curve of the ratio of the first schottky diode detector 8 and the second schottky diode detector 10 signals;
3) according to proof-spirit solution Terahertz reflection coefficient curve; settle the standard alcoholic solution Terahertz reflection coefficient curve harmonic peak position and with proof-spirit solution concentration Criterion alcoholic solution concentration-harmonic peak measurement update curve; from the proof-spirit solution change procedure of pure water to 100%; more than harmonic peak in proof-spirit solution Terahertz reflection coefficient curve moves and can reach 25GHz, the measurement of concetration precision of proof-spirit solution is reached more than 0.02%;
4) place alcoholic solution 3 to be measured, make THz wave that backward wave oscillator 4 sends in the interscan of 0.35 ~ 0.5THz frequency range, sweep frequency is spaced apart 5MHz, obtains the alcoholic solution Terahertz reflection coefficient curve to be measured of the ratio of the first schottky diode detector 8 and the second schottky diode detector 10 signals;
5) according to alcoholic solution Terahertz reflection coefficient curve to be measured, determine alcoholic solution Terahertz reflection coefficient curve harmonic peak to be measured position, and substitution is by step 1)～step 3) proof-spirit solution concentration-harmonic peak measurement update curve of setting up, obtain the accurate concentration of alcoholic solution to be measured.
As shown in Figure 3, utilize Terahertz reflection coefficient curve when to measure pure water, weight percent concentration on the alcohol concentration measurement mechanism of Terahertz anisotropic media resonance effect be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% proof-spirit solution.Can see that this curve is because the reflection coefficient curve harmonic peak that the Terahertz anisotropic media of double-level-metal resonant ring array composition forms moves with alcoholic solution concentration change.Because the Terahertz spectral resolution of backward wave oscillator can reach 5MHz, this biography can reach more than 0.02% alcoholic solution measurement of concetration precision more than moving from pure water to the harmonic peak of absolute alcohol reflection coefficient in inventing and can reaching 25GHz.
Claims (1)
1. an alcohol concentration measuring method of utilizing Terahertz anisotropic media resonance effect that uses alcohol concentration measurement mechanism, is characterized in that its step is as follows:
1) in the metal resonant ring structure (2) of polyimide substrate (1) upper surface, place respectively pure water, precision in 0.01% above weight percent concentration is: 5%, 10%, 15%, 20%, 25%, 30%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% proof-spirit solution;
2) THz wave that backward wave oscillator (4) sends is in the interscan of 0.35 ~ 0.5THz frequency range, sweep frequency is spaced apart 5MHz, obtains the proof-spirit solution Terahertz reflection coefficient curve of the ratio of the first schottky diode detector (8) and the second schottky diode detector (10) signal;
3) according to proof-spirit solution Terahertz reflection coefficient curve; settle the standard alcoholic solution Terahertz reflection coefficient curve harmonic peak position and with proof-spirit solution concentration Criterion alcoholic solution concentration-harmonic peak measurement update curve; from the proof-spirit solution change procedure of pure water to 100%; more than harmonic peak in proof-spirit solution Terahertz reflection coefficient curve moves and can reach 25GHz, the measurement of concetration precision of proof-spirit solution is reached more than 0.02%;
4) place alcoholic solution to be measured (3), make THz wave that backward wave oscillator (4) sends in the interscan of 0.35 ~ 0.5THz frequency range, sweep frequency is spaced apart 5MHz, obtains the alcoholic solution Terahertz reflection coefficient curve to be measured of the ratio of the first schottky diode detector (8) and the second schottky diode detector (10) signal;
5) according to alcoholic solution Terahertz reflection coefficient curve to be measured, determine alcoholic solution Terahertz reflection coefficient curve harmonic peak to be measured position, and substitution is by step 1)～step 3) proof-spirit solution concentration-harmonic peak measurement update curve of setting up, obtain the accurate concentration of alcoholic solution to be measured;
Described alcohol concentration measurement mechanism comprises polyimide substrate (1), metal resonant ring array (2), alcoholic solution to be measured (3), backward wave oscillator (4), high resistant silicon chip beam splitter (5), the first teflon lens (6), the second teflon lens (7), the first schottky diode detector (8), the 3rd teflon lens (9) and the second schottky diode detector (10);
The metal resonant ring structure (2) that polyimide substrate (1) upper surface is arranged, at the upper alcoholic solution to be measured (3) of placing variable concentrations of metal resonant ring array (2), the metal resonant ring array (2) of polyimide substrate (1) lower surface arrangement, the THz wave of being sent by backward wave oscillator (4) impinges perpendicularly on the metal resonant ring array (2) of lower surface arrangement after high resistant silicon chip beam splitter (5) reflection and the focusing of the first teflon lens (6), the THz wave being reflected sees through high resistant silicon chip beam splitter (5) and the second teflon lens (7) arrive the first schottky diode detector (8), meanwhile, the THz wave of being sent by backward wave oscillator (4) sees through high resistant silicon chip beam splitter (5) and the 3rd teflon lens (9) arrive the second schottky diode detector (10).
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| CN103335976B (en) * | 2013-06-04 | 2015-12-23 | 中国石油大学(北京) | Utilize the method for terahertz time-domain spectroscopy detecting the contet of sulphate, nitrate solution concentration |
| CN103364973A (en) * | 2013-06-29 | 2013-10-23 | 天津大学 | Soft terahertz wave modulator |
| CN106442424B (en) * | 2016-12-08 | 2024-01-30 | 中国计量大学 | Alcohol concentration measuring device and method using graphene terahertz surface plasma effect |
| CN106596475B (en) * | 2016-12-08 | 2024-05-17 | 中国计量大学 | Alcohol concentration measuring device and method using graphene and PVDF terahertz plasma resonance effect |
| CN106483104A (en) * | 2016-12-08 | 2017-03-08 | 中国计量大学 | Alcohol concentration measurement apparatus and method using PVDF Terahertz plasma resonance effect |
| CN108375556B (en) * | 2018-01-16 | 2021-04-30 | 南京大学 | Novel terahertz sensor for measuring monomolecular layer with high sensitivity and no mark |
| CN108414473B (en) * | 2018-03-13 | 2021-07-13 | 重庆邮电大学 | Terahertz waveband metamaterial sensor |
| CN109502540B (en) * | 2018-11-12 | 2020-11-03 | 中国科学院长春光学精密机械与物理研究所 | Preparation method of polarization type infrared detector based on film bulk acoustic resonator |
| CN110455743B (en) * | 2019-08-19 | 2021-08-06 | 中央民族大学 | Method for detecting aflatoxins B1 and B2 by utilizing terahertz waveband metamaterial sensor |
| CN110763650B (en) * | 2019-09-26 | 2022-01-18 | 北京农业信息技术研究中心 | Metamaterial structure and method for enhancing norfloxacin terahertz weak signal |
| CN112285029B (en) * | 2020-10-26 | 2022-11-15 | 南开大学 | Terahertz microstructure polarization sensing system for liquid chiral sample and detection method thereof |
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| CN202837178U (en) * | 2012-08-17 | 2013-03-27 | 中国计量学院 | Alcohol concentration measuring equipment utilizing terahertz incongruous medium resonance effect |
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