WO2004099765A1 - 流体の密度もしくは濃度の測定方法 - Google Patents
流体の密度もしくは濃度の測定方法 Download PDFInfo
- Publication number
- WO2004099765A1 WO2004099765A1 PCT/JP2004/006026 JP2004006026W WO2004099765A1 WO 2004099765 A1 WO2004099765 A1 WO 2004099765A1 JP 2004006026 W JP2004006026 W JP 2004006026W WO 2004099765 A1 WO2004099765 A1 WO 2004099765A1
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- WO
- WIPO (PCT)
- Prior art keywords
- vibration wave
- elastic body
- fluid
- vibration
- density
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
-
- 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
- G01N2291/021—Gases
- G01N2291/0215—Mixtures of three or more gases, e.g. air
-
- 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
Definitions
- the present invention relates to a method for measuring the density or concentration of a fluid such as an aqueous solution, slurry, or gas, and particularly to a method for continuously or periodically measuring the density or concentration of a fluid in a stationary state or a moving state. It relates to a suitable measuring method.
- the concentration or density of a solution to be treated or a treated aqueous solution containing an active ingredient is continuously or regularly measured. It is often measured and used for product management.
- concentration and density for this purpose, conventionally known hydrometers and pycnometers are not suitable.
- a concentration meter for a solution using an oscillating wave an oscillating wave is propagated through a solution to be measured, a transmission attenuation rate of the oscillating wave is measured, and the measured value is measured using two or more known concentrations.
- a method for calculating the desired concentration by comparing with a relational expression (calibration curve) obtained using the solution, and also by propagating the vibration wave through the solution to be measured and propagating the solution under vibration wave Then, the amount of phase change, resonance frequency, or sound velocity of the vibration wave is measured, and the measured value is compared with a relational expression (calibration curve) obtained using two or more solutions having known concentrations.
- a method for calculating a target concentration is known. However, each of these methods has a problem in the measurement accuracy when foreign substances such as bubbles are present in the solution.
- An object of the present invention is to provide a measurement method based on a new principle suitable for continuously or periodically measuring the density or concentration of a fluid such as an aqueous solution, slurry, or organic solvent solution. is there.
- the present inventor In order to measure the flow velocity of a fluid moving inside a tubular body or a groove-like structure, the present inventor has proposed that the wall of the tubular body or the groove-like structure in contact with the fluid has an When an oscillating wave such as a sound wave is applied and the propagation speed of the oscillating wave propagating through the wall is measured, the propagation speed is determined by the moving fluid caused by the vibration of the wall generated when the oscillating wave propagates through the wall. Have been found to fluctuate due to the influence of vibrations (estimated by Coriolisa), and have already invented a method to measure the fluid flow velocity with high accuracy using this phenomenon (PCT / JP02 / 11821). .
- the present inventor has found that the influence of the vibration of the fluid caused by the vibration of the wall generated when the vibration wave such as the ultrasonic wave propagates through the wall on the wall is given. Sound also occurs when the fluid is at rest, and the velocity of the oscillating wave propagating through the wall correlates with the mass of the fluid, and with the fluid concentration and fluid density correlated to the fluid mass. I found it. The present invention has been completed based on this new finding.
- the present invention firstly resides in a method for measuring the density of a stationary fluid comprising the following steps.
- the present invention also provides a method for measuring the density of a moving fluid, which comprises the following steps:
- the elastic body is placed on the moving fluid to be measured in such a manner that two vibration wave generation and detection devices are arranged along the fluid movement direction (however, the vibration direction and the two vibration wave generation detection devices are aligned). (It is not necessary for the connecting straight lines to be parallel, for example, they may intersect at an angle of about 45 ° or less.)
- the vibration wave is emitted from one vibration wave generation detection device to the elastic body.
- the vibration wave that is applied and propagates in the elastic body under the influence of the vibration of the moving fluid caused by the vibration of the elastic body generated when the vibration wave propagates in the elastic body is detected by the other vibration wave generation detection device Measuring the propagation time from the application of the vibration wave to the detection thereof;
- step (3) Subsequent to the above step (2), this time, a vibration wave is applied to the elastic body from the latter vibration wave generation detecting device, and the elastic body generated when the vibration wave propagates through the elastic body. Vibration waves that propagate through the elastic body under the influence of the moving fluid caused by the vibration of the object are detected by the former vibration wave generation detector, and the propagation time from the application of the vibration wave to the time of detection is measured. Performing the step;
- the density of the moving fluid to be measured is calculated from the average or the sum of the propagation times of the vibration waves measured in the step (4) and the relational expression obtained in the step (5). Process.
- the third aspect of the present invention is a method for measuring the concentration of a stationary fluid comprising the following steps.
- the present invention resides in a method for measuring the concentration of a moving fluid, comprising the following steps.
- the elastic body is placed on the moving fluid to be measured in such a manner that two vibration wave generation and detection devices are arranged along the fluid movement direction (however, the vibration direction and the two vibration wave generation detection devices are aligned). (It is not necessary for the connecting straight lines to be parallel, for example, they may intersect at an angle of about 45 ° or less.)
- the vibration wave is emitted from one vibration wave generation detection device to the elastic body.
- the vibration wave that is applied and propagates in the elastic body under the influence of the vibration of the moving fluid caused by the vibration of the elastic body generated when the vibration wave propagates in the elastic body is detected by the other vibration wave generation detection device Measuring the propagation time from the application of the vibration wave to the detection thereof;
- step (3) Subsequent to the above step (2), this time, a vibration wave is applied to the elastic body from the latter vibration wave generation detecting device, and the elastic body generated when the vibration wave propagates through the elastic body. Vibration waves that propagate through the elastic body under the influence of the moving fluid caused by the vibration of the object are detected by the former vibration wave generation detector, and the propagation time from the application of the vibration wave to the time of detection is measured. Performing the step;
- the density or concentration of a fluid of the present invention can be determined with high accuracy using a simple device. Can be measured.
- the method of measuring the density or concentration of the fluid of the present invention measures the mass of the fluid. Therefore, the present invention can also be described as a method for measuring the mass of a fluid.
- the density meter is composed of an elastic container containing a stationary fluid, a vibration wave generator and a vibration wave detector fixed outside the bottom of the container or outside the lower part of the side of the container. It is configured.
- the density meter comprises a tube having elasticity, a vibration wave generator fixed to the inner wall of the tube, and a vibration wave detector, and the outer wall of the tube is brought into contact with the fluid contained in the container. Touch and measure.
- the relational expression expressing the relationship between the fluid density and the propagation time of the vibration wave in the above (5) is such that, for each of two or more stationary fluids having different known densities, Alternatively, a densitometer having the same configuration as the densitometer is brought into contact, and in that contact state, a vibration wave is applied to the elastic body from one of the vibration wave generation and detection devices, and the vibration wave propagates through the elastic body.
- the vibration wave propagating through the elastic body under the influence of the vibration of the fluid caused by the vibration of the elastic body generated when It is obtained by the operation of detecting and measuring the propagation time from the application of the vibration wave to the detection.
- the density meter is composed of a tubular elastic body containing a moving fluid, and two vibration wave generation detecting devices fixed along the length direction to the outer wall surface of the tubular elastic body.
- the density meter is composed of a groove-like elastic body containing a moving fluid, and two vibration wave generation detecting devices fixed along the length direction to the outer wall surface of the groove-like elastic body. I have.
- the density meter is composed of an elongated plate-like elastic body and two vibration wave generation detecting devices fixed to the surface of the elastic body in a sealed state, and brings the elastic body into contact with a moving fluid. Measurement.
- the densitometer comprises an elastic container for storing a stationary fluid, a vibration wave generator and a vibration wave detector fixed outside the bottom of the container or outside the lower part of the side of the container. It is configured.
- the densitometer comprises a tube made of an elastic body, a vibration wave generator fixed to the inner wall of the tube, and a vibration wave detector, and the outer wall of the tube is filled with the fluid contained in the container. Make contact and measure.
- the densitometer is composed of a tubular elastic body containing a moving fluid, and two vibration wave generation detecting devices fixed along the length direction to the outer wall surface of the tubular elastic body.
- the densitometer is composed of a groove-like elastic body containing a moving fluid, and two vibration wave generation detection devices fixed along the length direction to the outer wall surface of the groove-like elastic body. I have.
- the densitometer is composed of an elongated plate-shaped elastic body and two vibration wave generation detecting devices fixed to the surface of the elastic body in a sealed state, and brings the elastic body into contact with a moving fluid. Measurement.
- FIG. 1 shows a state in which an aqueous solution 5 is contained in a densitometer or densitometer (hereinafter, represented by a densitometer) 1 of the present invention in a full state.
- the densitometer 1 has a vibration-wave generator 3 and a vibration-wave detector 4 on the bottom of a box-shaped elastic container 2 made of a synthetic resin (tetrafluoroethylene-perfluoroalkylbutyl ether copolymer). (E.g. epoxy (Resin).
- the vibration wave generator 3 and the vibration wave detector 4 have the same configuration.
- Examples of the elastic body used in the densitometer or densitometer of the present invention include a metal molded product and a synthetic resin molded product.
- FIG. 2 is a perspective view showing a configuration of the vibration wave generator 3.
- the vibration wave generator 3 is a device in which a carbon fiber composite material 7 for controlling the vibration direction is bonded to a piezoelectric element 6 with an adhesive (eg, epoxy resin).
- the arrangement direction of the carbon fibers 8 of the carbon fiber composite material 7 is a direction orthogonal to the direction in which vibration is to be propagated.
- T2 means the time from when the pulse wave voltage is applied to the vibration wave generator 3 until the vibration wave 9b is detected by the vibration wave detector 4.
- a panel wave voltage is applied to the vibration wave generator, and then the vibration wave propagating at the bottom of the container under the influence of the liquid is vibrated.
- the time (T1 and T2) until detection by the wave detector is different from each other.
- This relationship shows the relationship between the density of the liquid and the time required for the liquid to reach the vibration wave detector from the vibration wave generator. That is, by measuring Tl, ⁇ 2,... Using two or more liquids having known densities and different densities from each other, the density of the liquid and the time required for the vibration wave generator to reach the vibration wave detector are measured. Can be calculated, and a relational expression between them (for example, represented by calibration data or a calibration curve) can be obtained.
- the above The same amount of liquid with unknown density is placed in a container or a container with the same configuration as above, and the same operation is performed to reduce the time T3 required for the vibration wave 9c to reach the vibration wave detector from the vibration wave generator.
- the density of the density unknown liquid can be calculated.
- density can be replaced by density.
- the measurement target is not limited to a liquid (eg, an aqueous solution, a slurry, or an organic solvent solution), but may be a gas.
- the above Coriolis force (F) is to delay the propagation velocity of the vibration wave propagating through the elastic body under the contact of the fluid under vibration caused by the vibration of the elastic body in proportion to the mass m of the fluid.
- FIG. 4 shows a state in which the liquid 5 is moving from left to right inside a tubular densitometer or densitometer of the present invention (hereinafter, represented by a densitometer).
- the tube (tube) 10 is made of a synthetic resin (tetrafluoroethylene-perfluoroalkylvinyl ether copolymer), and a pair of vibration wave generation detectors l la, l ib Is fixed.
- a temperature sensor 13 is fixed to the upper and outer sides of the tube.
- strain gauges 14a and 14b are fixed to the upper and lower outer sides of the tube.
- the vibration wave generation detection devices l la and l ib have the same configuration as the vibration wave generation device shown in FIG.
- a pulse wave voltage is applied to the vibration wave generation detecting device 11a of the tubular density meter shown in FIG. 4 to generate a vibration wave, and the liquid 5 vibrated by the vibration of the vibration wave propagating through the wall of the tube 10.
- Vibration wave generation detector for vibration wave propagating through the tube wall under the influence of Measure the propagation time. This propagation time is delayed by ( ⁇ t) compared to the case of a stationary fluid due to the effect of the liquid 5 moving in the direction opposite to the traveling direction of the vibration wave (see FIG. 5).
- a pulse wave voltage is applied to the vibration wave generation and detection device l ib to generate a vibration wave, and the tube wall is influenced by the liquid 5 vibrating due to the vibration of the vibration wave propagating through the wall of the tube 10.
- the propagation time of the vibration wave propagating through the vibration wave to the vibration wave generation detector 11a is measured. This propagation time is shortened by (A t) compared with the case of the static liquid (1 At, see FIG. 5) due to the effect of the liquid 5 moving in the same direction as the traveling direction of the vibration wave.
- the propagation speed of the vibration waves propagating through the tube wall under the influence of the moving fluid can be reduced by the influence of the stationary liquid. It can be converted into the propagation velocity of the vibration wave propagating through the tube wall.
- the density of the liquid and the detection of one vibration wave generation when the liquid is in a stationary state It is possible to calculate the relationship between the device and the time it takes to reach the vibration wave generation detection device, and to obtain a relational expression between them (for example, represented by calibration data or a calibration curve). Therefore, when the liquid whose density is unknown is moved in the above-mentioned tube or a tube having the same configuration as above, and the liquid is kept stationary by the same operation, the other vibration wave is detected from one vibration wave generation detecting device. By measuring and calculating the time until the vibration wave arrives at the generation detection device, and performing the calculation using the above relational expression, the density of the moving liquid of unknown density can be calculated.
- the transmission time of the vibration wave in the elastic body is affected by the environmental temperature, it is also desirable to attach a temperature sensor to the densitometer and correct the calibration curve and the calibration data based on the temperature. It is also preferable to detect a change in the shape of the tube with a strain gauge and correct the change in the shape of the tube.
- the densitometer has an elongated plate-like elastic body 12 and two elastic bodies 12 fixed to the surface of the elastic body in a sealed state (for example, covered with a synthetic resin).
- the measurement can be performed by immersing the elastic body in a moving fluid.
- FIGS. 7 and 8 show a densitometer or densitometer effective for measuring the density or concentration of the fluid of the present invention. This shows deformation of a densitometer (hereinafter described as a density meter).
- the densitometer 1 shown in FIGS. 7 and 8 includes a U-shaped tube (for example, made of stainless steel) 12 having elasticity, a vibration wave generator 3 fixed to the inner wall of the tube 12, and a vibration wave
- the detection device 4 is configured to measure by bringing the tube into contact with a liquid 5 stored in a container 2 (for example, a tank for storing a liquid).
- the density meter having such a configuration measures the vibration wave transmission time at a desired position by moving the density meter in the container, for example, when the liquid in the container has a different density between the upper portion and the lower portion. Thus, the density of the liquid at each position can be measured.
- an elongated plate-like elastic body 12 shown in FIG. 6 and two vibration wave generation and detection devices l la, l are fixed to the surface of the elastic body in a sealed state.
- a densitometer composed of ibs can also be used.
- FIG. 1 is a diagram showing the configuration of an apparatus for measuring the density or concentration of a fluid contained in a container using the method for measuring density or concentration of the present invention.
- FIG. 2 is a diagram showing a configuration of a vibration wave generation detection device, a vibration wave generation device, and a vibration wave detection device.
- FIG. 3 is a diagram for explaining the principle of measuring the density (or concentration) of a fluid according to the present invention.
- FIG. 4 is a diagram showing an apparatus configuration for measuring the density or concentration of a fluid moving in a pipe using the density or concentration measuring method of the present invention.
- FIG. 5 is a diagram illustrating the principle of measuring the density (or concentration) of a fluid in a moving state according to the present invention.
- FIG. 6 is a diagram showing another example of a device configuration of a densitometer or a densitometer for measuring the density or the concentration of a fluid moving in a pipe or a groove using the density or concentration measuring method of the present invention. It is.
- FIG. 7 is a diagram showing another apparatus configuration for measuring the density or concentration of a fluid contained in a container using the method for measuring density or concentration of the present invention.
- FIG. 8 is a perspective view of the device of FIG. 7.
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2005505985A JPWO2004099765A1 (ja) | 2003-05-07 | 2004-05-07 | 流体の密度もしくは濃度の測定方法 |
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JP2003-164362 | 2003-05-07 | ||
JP2003164362 | 2003-05-07 |
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PCT/JP2004/006026 WO2004099765A1 (ja) | 2003-05-07 | 2004-05-07 | 流体の密度もしくは濃度の測定方法 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101800793B1 (ko) * | 2017-07-14 | 2017-11-24 | 주식회사 백광아이에스티 | 차염농도측정장치 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05312667A (ja) * | 1992-05-11 | 1993-11-22 | Matsushita Electric Ind Co Ltd | 湿度センサーおよび湿度計 |
JPH1164297A (ja) * | 1997-08-12 | 1999-03-05 | Chubu Electric Power Co Inc | 相変化物質測定器とこれを備えた熱輸送装置 |
-
2004
- 2004-05-07 JP JP2005505985A patent/JPWO2004099765A1/ja active Pending
- 2004-05-07 WO PCT/JP2004/006026 patent/WO2004099765A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05312667A (ja) * | 1992-05-11 | 1993-11-22 | Matsushita Electric Ind Co Ltd | 湿度センサーおよび湿度計 |
JPH1164297A (ja) * | 1997-08-12 | 1999-03-05 | Chubu Electric Power Co Inc | 相変化物質測定器とこれを備えた熱輸送装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101800793B1 (ko) * | 2017-07-14 | 2017-11-24 | 주식회사 백광아이에스티 | 차염농도측정장치 |
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