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WO2010089872A1 - Détecteur de concentration d'alcool - Google Patents

Détecteur de concentration d'alcool Download PDF

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Publication number
WO2010089872A1
WO2010089872A1 PCT/JP2009/051977 JP2009051977W WO2010089872A1 WO 2010089872 A1 WO2010089872 A1 WO 2010089872A1 JP 2009051977 W JP2009051977 W JP 2009051977W WO 2010089872 A1 WO2010089872 A1 WO 2010089872A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
alcohol
scatterer
intensity
alcohol concentration
Prior art date
Application number
PCT/JP2009/051977
Other languages
English (en)
Japanese (ja)
Inventor
和義 上松
峰夫 佐藤
健司 戸田
起男 前野
由 長谷川
Original Assignee
国立大学法人 新潟大学
根本特殊化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 国立大学法人 新潟大学, 根本特殊化学株式会社 filed Critical 国立大学法人 新潟大学
Priority to PCT/JP2009/051977 priority Critical patent/WO2010089872A1/fr
Publication of WO2010089872A1 publication Critical patent/WO2010089872A1/fr

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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
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2835—Specific substances contained in the oils or fuels
    • G01N33/2852—Alcohol in fuels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04186—Arrangements for control of reactant parameters, e.g. pressure or concentration of liquid-charged or electrolyte-charged reactants
    • H01M8/04194—Concentration measuring cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0444—Concentration; Density
    • H01M8/04447—Concentration; Density of anode reactants at the inlet or inside the fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1009—Fuel cells with solid electrolytes with one of the reactants being liquid, solid or liquid-charged
    • 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
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/4133—Refractometers, e.g. differential
    • 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
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/02—Mechanical
    • G01N2201/022—Casings
    • G01N2201/0221—Portable; cableless; compact; hand-held
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/062—LED's
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the present invention relates to an alcohol concentration sensor, and more particularly to an alcohol concentration sensor for a direct fuel cell.
  • Patent Document 1 As a conventional method for measuring the alcohol concentration in a solution, a method using a refractive index, a method using a crystal resonator (see, for example, Patent Document 1), a method using a transmission speed of ultrasonic waves (eg, a patent) A method using a difference in infrared absorption (see, for example, Patent Documents 3 to 5) is known.
  • Japanese Patent Laid-Open No. 6-18394 JP 11-23541 A JP 2006-292474 A JP-A-5-223733 Japanese Patent Laid-Open No. 1-112137
  • the method using the refractive index is a method of collecting a small amount of a test solution and measuring the alcohol concentration with a refractometer, and is the most accurate method, but continuous measurement is difficult.
  • the method using the transmission speed of ultrasonic waves is a method using the fact that the transmission speed of ultrasonic waves in a liquid differs depending on the composition of the liquid. This method has a disadvantage that the ultrasonic oscillation / reception element and the measurement circuit are special and expensive.
  • the method using the difference in infrared absorption is a method using the difference in infrared absorption between water and methanol.
  • the infrared absorption of methanol is in the region of several micrometers, the optical element in that wavelength region becomes expensive, and the electronic circuit for measurement also has a drawback of requiring high accuracy.
  • an object of the present invention is to provide a small and low-priced alcohol concentration sensor that can be used in a direct fuel cell for mounting on a portable electronic device.
  • the alcohol concentration sensor according to the present invention is in contact with an alcohol aqueous solution, scatters light that passes through the alcohol aqueous solution, scatters light, irradiates light to the light scatterer, and transmits or reflects the light scatterer.
  • a light intensity detecting means for detecting the light intensity is provided.
  • the light scattering means is a porous body having translucency.
  • the light scattering means is a glass powder sintered body.
  • the alcohol concentration sensor of the present invention utilizes the fact that the refractive index of the alcohol aqueous solution is slightly different depending on the alcohol concentration, and the light scattering means in contact with the alcohol aqueous solution is irradiated with light and transmitted through the light scattering means. The intensity of the reflected light is detected. Even if the refractive index of the alcohol aqueous solution is a slight difference, the intensity of the transmitted or reflected light appears as a large difference, so that the alcohol is accurately based on the intensity of the transmitted or reflected light in spite of a very simple configuration. The concentration can be calculated.
  • FIG. 1 shows the configuration of the alcohol concentration sensor in this embodiment.
  • Reference numeral 1 denotes a flow path through which an aqueous alcohol solution to be measured flows, and a scatterer 2 as a light scattering means is disposed inside the flow path 1.
  • light irradiation means 3 for irradiating light to the scatterer 2 so as to sandwich both sides of the scatterer 2
  • light intensity detection means 4 for detecting the intensity of light transmitted through the scatterer 2.
  • a pump (not shown) is provided connected to the flow path 1.
  • the flow path 1 is composed of, for example, a transparent glass tube.
  • this flow path 1 is formed of a glass tube, in order to increase the detection accuracy in the light intensity detection means 4, the portions facing the light irradiation means 3 and the light intensity detection means 4 are flat glass tubes, that is, face each other. It is preferable to use a glass tube made of a glass plate having two parallel surfaces. Note that a glass tube whose two surfaces are not flat may be used, but in that case, the light intensity incident from the light irradiation means 3 and the light intensity detection means 4 are detected by the influence of the curved surface. The intensity of light decreases, and the detection accuracy in the light intensity detection means 4 decreases.
  • the scatterer 2 is formed of a transparent glass powder sintered body as a porous body having translucency.
  • the scatterer 2 is composed of a glass powder sintered body, for example, glass particles having a particle diameter of 10 to 100 ⁇ m, which are baked and hardened so as not to crush the pores, can be used. Depending on the situation, it can be changed appropriately. In the case of using a commercially available glass powder sintered body, for example, one used for a glass filter can be processed and used.
  • the light irradiation means 3 and the light intensity detection means 4 may be separately configured using a light emitting diode, a phototransistor, or the like, but can be integrally configured by, for example, a transmissive photo interrupter.
  • a photo interrupter By using a photo interrupter, the alcohol concentration sensor can be easily downsized.
  • the photo interrupter is an electronic component that is composed of a light emitting unit corresponding to the light irradiating unit 3 and a light receiving unit corresponding to the light intensity detecting unit 4, and is used to determine the presence or absence and position of an object.
  • the light-receiving unit is configured so that the light-receiving unit detects light from the light-emitting unit.
  • an infrared light emitting diode is preferably used as a measure against disturbance light.
  • a phototransistor or a photo IC is used as the light receiving element of the light receiving unit.
  • the alcohol concentration sensor of the present embodiment can be configured by arranging a portion where the scatterer 2 of the flow path 1 is provided between the light-emitting portion and the light-receiving portion of the photo interrupter.
  • FIG. 2 shows an example of an electric circuit of the alcohol concentration sensor in the present embodiment.
  • a constant current power source 6 is connected to the light emitting diode 5 of the light irradiation means 3 so that light of a certain intensity is irradiated.
  • a resistor 8 and a constant voltage power source 9 are connected in series to the phototransistor 7 of the light intensity detection means 4. Since the output voltage Vout across the resistor 8 changes in accordance with the change in the current of the phototransistor 7, that is, the intensity of light detected by the phototransistor 7, the scatterer 2 is detected by detecting the output voltage Vout. The intensity of the light transmitted through can be measured.
  • the aqueous alcohol solution As a measurement target is supplied to the flow channel 1 by a pump (not shown), the aqueous alcohol solution flows inside the scatterer 2 disposed in the flow channel 1.
  • the light irradiated to the scatterer 2 from the light irradiating means 3 is repeatedly refracted and reflected repeatedly at the interface between the scatterer 2 and the alcohol aqueous solution, and a part of the light passes through the scatterer 2 and the light intensity on the opposite side.
  • the detection means 4 is reached.
  • the intensity of the light reaching the light intensity detecting means 4 Decrease. That is, the intensity of the light reaching the light intensity detecting means 4 changes corresponding to the change in the refractive index of the alcohol aqueous solution. Therefore, the alcohol concentration of the alcohol aqueous solution can be obtained by measuring the intensity of the light reaching the light intensity detecting means 4 based on the fact that the refractive index of the alcohol aqueous solution varies depending on the alcohol concentration.
  • Table 1 shows refractive indexes of water, methanol, ethanol, representative transparent materials that can be used as materials of formic acid, acetaldehyde, and scatterer 2 which are by-products during power generation of the direct fuel cell.
  • a methanol aqueous solution was used as the alcohol aqueous solution, and the methanol concentration was gradually changed from 0% to 100% every 10% by mass to measure the response characteristics of the output voltage Vout .
  • the result is shown in FIG. It was confirmed that the output voltage responded promptly according to the change in methanol concentration.
  • FIG. 6 shows the relationship between the methanol concentration measured with a refractometer and the refractive index.
  • the output voltage curve shown in FIG. 4 and the refractive index curve shown in FIG. 6 have similar shapes, and it was confirmed that the output voltage changes according to the change in the refractive index of the aqueous methanol solution.
  • the output voltage showed a change of 91 mV. Therefore, it was confirmed that a change in the concentration of methanol of about 0.1% by mass can be detected sufficiently.
  • the alcohol concentration sensor of this embodiment when used for a direct fuel cell, the influence of by-products during power generation becomes a problem. Therefore, the influence of formic acid considered as a by-product during power generation of the direct fuel cell was examined.
  • the alcohol concentration sensor of the present embodiment includes the scatterer 2 that contacts the aqueous alcohol solution and scatters the light that passes through the aqueous alcohol solution, the light irradiation means 3 that irradiates the scatterer 2 with light, and the scattering.
  • Light intensity detecting means 4 for detecting the intensity of light transmitted through the body 2 is provided.
  • the fact that the refractive index of the alcohol aqueous solution is slightly different depending on the alcohol concentration is utilized, and the scatterer 2 in contact with the alcohol aqueous solution is irradiated with light and transmitted through the scatterer 2. The intensity of the light is detected.
  • the scatterer 2 is a porous body having translucency, the light irradiated from the light irradiating means 3 is refracted at the interface between the aqueous alcohol solution and the scatterer 2 before passing through the scatterer 2.
  • the number of reflections can be extremely increased, and as a result, the alcohol concentration can be accurately calculated.
  • the scatterer 2 is a glass powder sintered body, it is easy to obtain materials for forming the scatterer 2, and the manufacture of the scatterer 2 is easy, so an alcohol concentration sensor is provided at a low price. can do.
  • the alcohol concentration sensor of this embodiment by attaching the alcohol concentration sensor of this embodiment to the fuel supply flow path of the direct type fuel cell, it becomes possible to keep the alcohol concentration constant while constantly monitoring the alcohol concentration in the supplied fuel. .
  • the valve of the storage tank containing high concentration alcohol is opened, and when the target concentration is reached, the valve is closed.
  • the alcohol concentration can be kept within a certain range.
  • the alcohol concentration sensor of this embodiment can be used not only for direct fuel cells but also for fuel cells using alcohol as fuel and internal combustion engines in general.
  • FIG. 7 shows the configuration of the alcohol concentration sensor in this embodiment.
  • symbol is attached
  • the arrangement of the light irradiation means 3 and the light intensity detection means 4 is different from that in the first embodiment.
  • light irradiation means 3 for irradiating the scatterer 2 with light and light intensity detection means 4 for detecting the intensity of the light reflected from the scatterer 2 are arranged on one side of the scatterer 2. Yes.
  • the flow path 1 is formed of a glass tube
  • a glass tube having a flat portion facing the light irradiation means 3 and the light intensity detection means 4 in order to increase the detection accuracy of the light intensity detection means 4.
  • a glass tube having a non-flat portion may be used.
  • the intensity of light incident from the light irradiation means 3 and the light detected by the light intensity detection means 4 are affected by the curved surface. The intensity decreases, and the detection accuracy in the light intensity detection means 4 decreases.
  • the light irradiation means 3 and the light intensity detection means 4 may be separately configured using light emitting diodes, phototransistors, or the like.
  • the light irradiation means 3 and the light intensity detection means 4 can be integrally configured by a reflective photo interrupter, that is, a photo reflector. .
  • a photo reflector By using a photo reflector, the alcohol concentration sensor can be easily downsized.
  • the photo reflector is an electronic component that is composed of a light emitting unit corresponding to the light irradiating unit 3 and a light receiving unit corresponding to the light intensity detecting unit 4, and is used to determine the presence or absence and position of an object.
  • the light receiving unit is arranged adjacent to each other in the same direction, and is configured such that light from the light emitting unit is applied to the object and the reflected light is detected by the light receiving unit.
  • the electric circuit in the present embodiment can be configured in the same manner as in the first embodiment.
  • the intensity of the light reflected from the scatterer 2 can be measured by detecting the output voltage Vout .
  • the light irradiated to the scatterer 2 from the light irradiating means 3 advances in a repetitive manner by refraction and reflection at the interface between the scatterer 2 and the alcohol aqueous solution, and a part of the light is reflected from the scatterer 2 and the light intensity detecting means 4.
  • the greater the difference in refractive index between the alcohol aqueous solution and the scatterer 2 the greater the amount of light that is refracted, reflected and scattered at the interface between the scatterer 2 and the alcohol aqueous solution, so the intensity of the light reaching the light intensity detecting means 4 Will increase. Therefore, the alcohol concentration of the alcohol aqueous solution can be obtained by measuring the intensity of the light reaching the light intensity detecting means 4 based on the fact that the refractive index of the alcohol aqueous solution varies depending on the alcohol concentration.
  • the alcohol concentration sensor of the present embodiment has a smaller output voltage than that of the first embodiment, but the light irradiation means 3 and the light intensity detection means 4 can be integrally formed on one side of the flow path 1 and thus can be easily downsized. Has the advantage of being.
  • the alcohol concentration sensor of the present embodiment includes the scatterer 2 that contacts the aqueous alcohol solution and scatters the light that passes through the aqueous alcohol solution, the light irradiation means 3 that irradiates the scatterer 2 with light, and the scattering.
  • a light intensity detecting means 4 for detecting the intensity of light reflected from the body 2 is provided.
  • the fact that the refractive index of the alcohol aqueous solution is slightly different depending on the alcohol concentration is utilized. Light is applied to the scatterer 2 in contact with the alcohol aqueous solution, and the scatterer 2 is reflected. The intensity of the light is detected.
  • the material of the scatterer 2 various transparent plastics can be used in addition to glass. Further, not only the powder sintered body but also a chip-like, plate-like, or rod-like material can be used. In the case of a plate shape, the refraction and reflection of light can be adjusted by adjusting the angle of the plate with respect to the optical path. Furthermore, the scatterer 2 can be substituted by making the inner surface of the flow channel 1 rough, for example, ground glass.
  • a visible light emitting diode such as red or blue or a laser diode can be used.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrochemistry (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Pathology (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fuel Cell (AREA)

Abstract

La présente invention a pour objet un détecteur de concentration d'alcool de petite taille et bon marché qui peut être utilisé dans une pile à combustible directe destinée à être montée dans un dispositif électronique portatif. Le détecteur de concentration d'alcool est pourvu d'un diffuseur (2) pour diffuser la lumière transmise par une solution aqueuse d'alcool, qui est en contact avec la solution aqueuse d'alcool, d'un moyen d'irradiation de lumière (3) pour irradier le diffuseur (2) avec la lumière, et un moyen de détection de l'intensité lumineuse (4) pour détecter l'intensité de la lumière transmise par le diffuseur (2). La légère différence de l'indice de réfraction de la solution aqueuse d'alcool en fonction de la concentration d'alcool est utilisée. Le diffuseur (2) qui est en contact avec la solution aqueuse d'alcool est irradié avec la lumière, et l'intensité de la lumière transmise par le diffuseur (2) est détectée. Même si la différence de l'indice de réfraction de la solution aqueuse d'alcool est légère, la différence de l'intensité de la lumière transmise est grande, de sorte que la concentration d'alcool peut être précisément calculée sur la base de l'intensité de la lumière transmise en dépit d'une structure extrêmement simple.
PCT/JP2009/051977 2009-02-05 2009-02-05 Détecteur de concentration d'alcool WO2010089872A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/051977 WO2010089872A1 (fr) 2009-02-05 2009-02-05 Détecteur de concentration d'alcool

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Application Number Priority Date Filing Date Title
PCT/JP2009/051977 WO2010089872A1 (fr) 2009-02-05 2009-02-05 Détecteur de concentration d'alcool

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WO2010089872A1 true WO2010089872A1 (fr) 2010-08-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103630513A (zh) * 2013-11-01 2014-03-12 刘星铄 一种用于瓶装酒酒精浓度测量的装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6298237A (ja) * 1985-10-25 1987-05-07 Nippon Telegr & Teleph Corp <Ntt> 多孔質ガラス焼結体のカサ密度測定方法及び測定装置
JPH05223733A (ja) * 1992-02-10 1993-08-31 Japan Electron Control Syst Co Ltd 光学式アルコール濃度測定装置
JP2007024868A (ja) * 2005-06-15 2007-02-01 Fujifilm Corp 流体分析デバイス及び流体分析装置
JP2009079974A (ja) * 2007-09-26 2009-04-16 Niigata Univ アルコール濃度センサ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6298237A (ja) * 1985-10-25 1987-05-07 Nippon Telegr & Teleph Corp <Ntt> 多孔質ガラス焼結体のカサ密度測定方法及び測定装置
JPH05223733A (ja) * 1992-02-10 1993-08-31 Japan Electron Control Syst Co Ltd 光学式アルコール濃度測定装置
JP2007024868A (ja) * 2005-06-15 2007-02-01 Fujifilm Corp 流体分析デバイス及び流体分析装置
JP2009079974A (ja) * 2007-09-26 2009-04-16 Niigata Univ アルコール濃度センサ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BAUSHEV V N ET AL.: "Dispersion scatterer based on a porous matrix", OPTICS AND SPECTROSCOPY, vol. 50, no. 5, May 1981 (1981-05-01), pages 548 - 549 *
KAZUYOSHI UEMATSU ET AL.: "Chokusetsu Methanol-gata Nenryo Denchi-yo Kogata Alcohol Nodo Sensor no Kaihatsu", NEN (HEISEI 20 NEN) SHUKI DAI 69 KAI EXTENDED ABSTRACTS; THE JAPAN SOCIETY OF APPLIED PHYSICS, vol. 1, 2 September 2008 (2008-09-02), pages 133 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103630513A (zh) * 2013-11-01 2014-03-12 刘星铄 一种用于瓶装酒酒精浓度测量的装置
CN103630513B (zh) * 2013-11-01 2017-02-01 刘星铄 一种用于瓶装酒酒精浓度测量的装置

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