JPH1123541A - Method and apparatus for measuring alcohol concentration - Google Patents
Method and apparatus for measuring alcohol concentrationInfo
- Publication number
- JPH1123541A JPH1123541A JP9174320A JP17432097A JPH1123541A JP H1123541 A JPH1123541 A JP H1123541A JP 9174320 A JP9174320 A JP 9174320A JP 17432097 A JP17432097 A JP 17432097A JP H1123541 A JPH1123541 A JP H1123541A
- Authority
- JP
- Japan
- Prior art keywords
- alcohol
- measuring
- concentration
- ultrasonic waves
- solution
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02809—Concentration of a compound, e.g. measured by a surface mass change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02818—Density, viscosity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02881—Temperature
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
(57)【要約】
【課題】 本発明は、アルコールの濃度測定に関し、特
にアルコールが添加された溶液での超音波の音速を測定
し、音速の温度変化率を測定することによって、アルコ
ールの濃度を精度良く判別できるアルコール濃度測定方
法および装置に関する。
【解決手段】 超音波を利用してアルコールの濃度を測
定する方法であって、被測定アルコール水溶液中に超音
波を送信する工程と、前記超音波のアルコール水溶液中
の速度を測定する工程と、前記アルコール水溶液を加熱
する工程と、加熱後のアルコール水溶液中の超音波の速
度を測定する工程と、前記アルコール水溶液中の加熱前
と加熱後の超音波伝播速度の変化によりアルコール濃度
を測定する工程とを有することを特徴とする。
(57) Abstract: The present invention relates to a method for measuring the concentration of alcohol, and in particular, by measuring the sound speed of ultrasonic waves in a solution to which alcohol is added, and measuring the rate of temperature change of the sound speed. The present invention relates to a method and an apparatus for measuring an alcohol concentration, which can accurately determine the alcohol concentration. SOLUTION: A method for measuring the concentration of alcohol using ultrasonic waves, comprising: transmitting ultrasonic waves into an aqueous alcohol solution to be measured; and measuring a speed of the ultrasonic waves in the aqueous alcohol solution. Heating the alcohol aqueous solution, measuring the speed of ultrasonic waves in the alcohol aqueous solution after heating, and measuring the alcohol concentration by changing the ultrasonic wave propagation speed before and after heating in the alcohol aqueous solution And characterized in that:
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アルコールの濃度
測定に関し、特にアルコールが添加された溶液での超音
波の音速を測定し、音速の温度変化率を測定することに
よって、アルコールの濃度を精度良く判別できるアルコ
ール濃度測定方法および装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the concentration of alcohol, and more particularly, to measuring the sound speed of ultrasonic waves in a solution to which alcohol is added, and measuring the rate of temperature change of the sound speed to accurately measure the alcohol concentration. The present invention relates to a method and an apparatus for measuring an alcohol concentration which can be distinguished well.
【０００２】[0002]
【従来の技術】超音波の伝播速度により水溶液中のアル
コール濃度を求めようとした場合、解が二つ存在するこ
とになり、精度的に十分なものとは言えなかった。この
ため、より高精度で簡便なアルコール濃度測定方法およ
び装置が望まれていた。2. Description of the Related Art When it is attempted to determine the alcohol concentration in an aqueous solution based on the propagation speed of an ultrasonic wave, there are two solutions, which cannot be said to be sufficiently accurate. Therefore, a more accurate and simple method and apparatus for measuring the alcohol concentration have been desired.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は、アル
コールを添加した溶液のアルコール濃度を測定する場合
に、超音波の音速測定による方法を検討し、事前に求め
たアルコール濃度と音速−温度変化率の関係から、精度
よく測定することを可能とするアルコール濃度測定方法
および装置を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to examine a method of measuring the sound speed of ultrasonic waves when measuring the alcohol concentration of a solution to which alcohol has been added, and to obtain the alcohol concentration and sound speed-temperature determined in advance. It is an object of the present invention to provide an alcohol concentration measuring method and apparatus which enable accurate measurement from the relationship of the rate of change.
【０００４】本発明の他の目的は、前記測定方法をアル
コール以外の他の二液混合液の濃度測定を検討し、低温
時の音速と高温時の音速から音速の温度変化率を求め、
これによって前記濃度を求める濃度測定方法および装置
を提供することにある。本発明の別の目的は、従来では
音速値に極大点を有する特定濃度に対しても、前記音速
−温度変化率から精度よく、かつ簡便に濃度測定を可能
とするアルコール濃度測定方法および装置を提供するこ
とにある。Another object of the present invention is to examine the above-mentioned measuring method by measuring the concentration of a two-liquid mixture other than alcohol, and determining the temperature change rate of the sound speed from the sound speed at a low temperature and the sound speed at a high temperature.
Accordingly, it is an object of the present invention to provide a method and an apparatus for measuring the concentration for obtaining the concentration. Another object of the present invention is to provide a method and an apparatus for measuring an alcohol concentration that can perform a concentration measurement with high accuracy from the sound velocity-temperature change rate, and also easily, for a specific concentration having a maximum point in the sound velocity value. To provide.
【０００５】[0005]
【課題を解決するための手段】上記の目的は、超音波を
利用してアルコールの濃度を測定する方法であって、被
測定アルコール水溶液中に超音波を送信する工程と、前
記超音波のアルコール水溶液中の速度を測定する工程
と、前記アルコール水溶液を加熱する工程と、加熱後の
アルコール水溶液中の超音波の速度を測定する工程と、
前記アルコール水溶液中の加熱前と加熱後の超音波伝播
速度の変化によりアルコール濃度を測定する工程とを有
することを特徴とするアルコール濃度測定方法によって
達成される。また、上記の目的は、超音波を利用してア
ルコールの濃度を測定する装置であって、被測定アルコ
ール水溶液中に超音波を送受信するトランスデューサ、
被測定物を加熱するヒータ、被測定物の温度を測定する
温度センサ、超音波の伝播距離を一定に保つ反射面、お
よび伝播時間を計測する電子回路部からなることを特徴
とするアルコール濃度測定装置によっても達成される。An object of the present invention is to provide a method for measuring the concentration of alcohol using ultrasonic waves, comprising: transmitting ultrasonic waves into an aqueous alcohol solution to be measured; Measuring the speed in the aqueous solution, heating the alcohol aqueous solution, and measuring the speed of the ultrasonic wave in the heated alcohol aqueous solution,
A method of measuring the alcohol concentration by a change in the ultrasonic wave propagation speed before and after heating in the alcohol aqueous solution. Further, the above object is an apparatus for measuring the concentration of alcohol using ultrasonic waves, a transducer for transmitting and receiving ultrasonic waves in the alcohol aqueous solution to be measured,
Alcohol concentration measurement characterized by comprising a heater for heating an object to be measured, a temperature sensor for measuring the temperature of the object to be measured, a reflecting surface for keeping the ultrasonic wave propagation distance constant, and an electronic circuit for measuring the propagation time This is also achieved by the device.
【０００６】[0006]
【発明の実施の形態】メタノール水溶液中の超音波の音
速と温度との関係を図３に、また、メタノール濃度と超
音波の音速との関係を図４にそれぞれ示す。これらの図
から、超音波を用いてメタノール水溶液中の濃度を測定
した時、図４のメタノール濃度３０％近傍では、一音速
値に対して、二組のメタノール濃度が存在する。すなわ
ち、ある濃度のところで音速の極大値を持つ場合には、
その場合、音速値のみから濃度を求めようとすると解が
二つ出る。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows the relationship between the sound speed of ultrasonic waves and the temperature in an aqueous methanol solution, and FIG. 4 shows the relationship between the methanol concentration and the sound speed of ultrasonic waves. From these figures, when the concentration in the methanol aqueous solution is measured using ultrasonic waves, there are two sets of methanol concentrations for one sound velocity value near the methanol concentration of 30% in FIG. That is, if the sound velocity has a maximum value at a certain density,
In that case, if the density is determined only from the sound velocity value, two solutions are obtained.
【０００７】本発明者等はこの問題を解決するために、
実験を行い次のような知見を得た。前記極大値の近傍に
おいても、図３に示されるように温度と超音波音速の関
係は一次関係を有する。図３では、各メタノール濃度の
水溶液に対して温度の音速との関係をとったものであ
る。これらの各濃度での温度と音速値の関係から、つま
り常用の温度範囲としての大気温では、温度に対する音
速の変化率が濃度に対して一定の割合で変化することが
認められ、この関係から音速値の濃度への変換ができ
る。[0007] To solve this problem, the present inventors have
An experiment was performed and the following findings were obtained. Even in the vicinity of the maximum value, the relationship between the temperature and the ultrasonic sound velocity has a linear relationship as shown in FIG. In FIG. 3, the relationship between the aqueous solution having each methanol concentration and the sound speed of the temperature is shown. From the relationship between the temperature and the sound velocity value at each of these concentrations, that is, at ambient temperature as a normal temperature range, the rate of change of the sound velocity with respect to temperature changes at a constant rate with respect to the concentration. Conversion of sound velocity value to density is possible.
【０００８】本発明では、アルコール等の混合された溶
液での、濃度を簡便でかつ精度よく超音波の音速から検
出することが可能となる。本発明の実施のための装置を
図２に示す。なお、本発明では、濃度測定装置は常にア
ルコール溶液に浸漬して使用されるものである。トラン
スデューサ１からアルコール溶液中に所定の周波数の超
音波を送信し、反射面４から跳ね返ってくる反射波を受
信する。このアルコール溶液中を伝播した超音波４の往
復時間ｔを伝播時間測定回路７で測定し、距離Ｌをｔで
割ることでアルコール溶液中の音速が求まる。溶液の温
度は、温度計６によって認識され、ヒータ３を制御する
ことによって一定に保持することができる。According to the present invention, it is possible to simply and accurately detect the concentration in a solution in which alcohol or the like is mixed from the sound speed of ultrasonic waves. FIG. 2 shows an apparatus for carrying out the present invention. In the present invention, the concentration measuring device is always immersed in an alcohol solution. An ultrasonic wave having a predetermined frequency is transmitted from the transducer 1 into the alcohol solution, and a reflected wave rebounding from the reflecting surface 4 is received. The reciprocating time t of the ultrasonic wave 4 propagating in the alcohol solution is measured by the propagation time measuring circuit 7, and the sound speed in the alcohol solution is obtained by dividing the distance L by t. The temperature of the solution is recognized by the thermometer 6 and can be kept constant by controlling the heater 3.
【０００９】図３では、３種の濃度のアルコールを添加
した水溶液について音速と温度の関係を整理したもの
で、濃度２０％、および３０％では変化率は小さいが、
４０％ではかなり大きな割合で変化する。しかし、図４
に示されるように、従来の密度と温度の関係におけるよ
うなアルコール濃度による音速との関係の極大点は存在
する。FIG. 3 shows the relationship between the sound speed and the temperature for an aqueous solution to which three kinds of alcohols are added. The change rate is small at the concentrations of 20% and 30%.
At 40% it changes at a fairly large rate. However, FIG.
As shown in the above, there is a local maximum in the relationship between the sound speed due to the alcohol concentration as in the conventional relationship between the density and the temperature.
【００１０】そこで温度の変化によって測定物性の温度
依存性による変化を伴い、音速は温度とともに変化す
る。図３では、前記３濃度のアルコール水溶液での音速
は温度の上昇とともに低下することを示している。この
ため、特性の評価にはある二点の温度での音速を求め、
音速−温度変化率で整理することによって、図１のよう
な関係が得られた。すなわち、該アルコール水溶液をヒ
ータ３によって加熱し、音速測定時の温度を変化させ
る。その時、低い温度の時の音速値と高い温度の時の音
速値から音速のオンと変化率を求めたものである。図１
から分かるように、アルコール水溶液の温度変化率は、
アルコール濃度の上昇とともに大きくなる。Therefore, a change in temperature accompanies a change due to the temperature dependency of the measured physical property, and the speed of sound changes with temperature. FIG. 3 shows that the sound speed in the three-concentration aqueous alcohol solution decreases as the temperature increases. For this reason, to evaluate the characteristics, the sound velocity at certain two temperatures was determined.
By arranging the sound velocity and the temperature change rate, the relationship as shown in FIG. 1 was obtained. That is, the alcohol aqueous solution is heated by the heater 3 to change the temperature at the time of measuring the speed of sound. At this time, the ON and the rate of change of the sound speed are obtained from the sound speed value at a low temperature and the sound speed value at a high temperature. FIG.
As can be seen from FIG.
Increases with increasing alcohol concentration.
【００１１】いずれの濃度のアルコール水溶液において
も濃度と音速−温度変化率は、直線的に変化しその傾き
がほぼ等しい範囲が存在するため、この直線に基づき一
定温度における変化率が分かればアルコール水溶液の濃
度を求めることができる。なお、本発明のアルコール類
は、メタノール、エタノール、プロピルアルコール、ブ
チルアルコール、アミルアルコール、ブタノール、オク
チルアルコール等が使用できる。In any concentration of alcohol aqueous solution, there is a range in which the concentration and the speed of change of sound velocity and temperature change linearly, and there is a range in which the gradients are almost equal. Can be determined. In addition, as the alcohols of the present invention, methanol, ethanol, propyl alcohol, butyl alcohol, amyl alcohol, butanol, octyl alcohol and the like can be used.
【００１２】[0012]
【発明の効果】本発明は、超音波の音速を測定して、ア
ルコール濃度を求めるものであって、従来のようなアル
コール添加の密度の測定における偏差の発生がなく精度
良く求めることができる。また、本発明をアルコール水
溶液の濃度に限らず、音速−温度特性の異なる二種類混
合の液の濃度測定へも応用可能である。According to the present invention, the alcohol concentration is determined by measuring the sound velocity of the ultrasonic wave, and the concentration can be determined with high accuracy without the occurrence of a deviation in the conventional measurement of the density of alcohol addition. In addition, the present invention is not limited to the concentration of the aqueous alcohol solution, and can be applied to the measurement of the concentration of a mixture of two types having different sound speed-temperature characteristics.
【図１】本発明に係るメタノール濃度と音速−温度変化
率との関係を示す図である。FIG. 1 is a diagram showing the relationship between the methanol concentration and the speed of change of sound speed versus temperature according to the present invention.
【図２】本発明に係るメタノール濃度と音速−温度変化
率との関係からメタノール濃度を求めるための装置の概
要を示す図である。FIG. 2 is a diagram showing an outline of an apparatus for obtaining a methanol concentration from a relationship between a methanol concentration and a sound velocity-temperature change rate according to the present invention.
【図３】本発明に係るメタノール濃度による温度と音速
の関係を示す図である。FIG. 3 is a diagram showing a relationship between temperature and sound speed depending on methanol concentration according to the present invention.
【図４】本発明に係るメタノール濃度と音速の関係を示
す図である。FIG. 4 is a diagram showing the relationship between methanol concentration and sound speed according to the present invention.
１…トランスデューサ ２…センサ部 ３…ヒータ ４…反射面 ５…容器 ６…温度計 ７…伝播時間測定回路（音速測定） DESCRIPTION OF SYMBOLS 1 ... Transducer 2 ... Sensor part 3 ... Heater 4 ... Reflecting surface 5 ... Container 6 ... Thermometer 7 ... Propagation time measurement circuit (sound velocity measurement)
Claims (2)
定する方法であって、被測定アルコール水溶液中に超音
波を送信する工程と、該超音波のアルコール水溶液中の
速度を測定する工程と、前記アルコール水溶液を加熱す
る工程と、加熱後のアルコール水溶液中の超音波の速度
を測定する工程と、前記アルコール水溶液中の加熱前と
加熱後の超音波伝播速度の変化によりアルコール濃度を
測定する工程とを有することを特徴とするアルコール濃
度測定方法。1. A method for measuring the concentration of alcohol using ultrasonic waves, comprising: transmitting ultrasonic waves into an aqueous alcohol solution to be measured; and measuring a speed of the ultrasonic waves in the aqueous alcohol solution. Heating the alcohol aqueous solution, measuring the speed of ultrasonic waves in the alcohol aqueous solution after heating, and measuring the alcohol concentration by changing the ultrasonic wave propagation speed before and after heating in the alcohol aqueous solution. And a method for measuring an alcohol concentration.
定する装置であって、被測定アルコール水溶液中に超音
波を送受信するトランスデューサ、被測定物を加熱する
ヒータ、被測定物の温度を測定する温度センサ、超音波
の伝播距離を一定に保つ反射面、および伝播時間を計測
する電子回路部からなることを特徴とするアルコール濃
度測定装置。2. An apparatus for measuring the concentration of alcohol using ultrasonic waves, comprising: a transducer for transmitting / receiving ultrasonic waves in an aqueous alcohol solution to be measured, a heater for heating an object to be measured, and measuring a temperature of the object to be measured. An alcohol concentration measuring device, comprising: a temperature sensor, a reflecting surface for keeping the propagation distance of the ultrasonic wave constant, and an electronic circuit for measuring the propagation time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9174320A JPH1123541A (en) | 1997-06-30 | 1997-06-30 | Method and apparatus for measuring alcohol concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9174320A JPH1123541A (en) | 1997-06-30 | 1997-06-30 | Method and apparatus for measuring alcohol concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1123541A true JPH1123541A (en) | 1999-01-29 |
Family
ID=15976591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9174320A Pending JPH1123541A (en) | 1997-06-30 | 1997-06-30 | Method and apparatus for measuring alcohol concentration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1123541A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010025628A (en) * | 2008-07-16 | 2010-02-04 | Mitsui Mining & Smelting Co Ltd | Fluid identification method and fluid identification device |
| CN117368275A (en) * | 2023-12-07 | 2024-01-09 | 江苏食品药品职业技术学院 | A full-range measurement method, system and device for alcohol concentration |
-
1997
- 1997-06-30 JP JP9174320A patent/JPH1123541A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010025628A (en) * | 2008-07-16 | 2010-02-04 | Mitsui Mining & Smelting Co Ltd | Fluid identification method and fluid identification device |
| CN117368275A (en) * | 2023-12-07 | 2024-01-09 | 江苏食品药品职业技术学院 | A full-range measurement method, system and device for alcohol concentration |
| CN117368275B (en) * | 2023-12-07 | 2024-03-08 | 江苏食品药品职业技术学院 | A full-range measurement method, system and device for alcohol concentration |
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