DE102012224096A1 - Arrangement for determining concentration of component of fluid mixture, has auxiliary chamber communicated with fluid mixture in thermal contact and filled with calibration fluid as function of propagation velocity of ultrasonic wave - Google Patents
Arrangement for determining concentration of component of fluid mixture, has auxiliary chamber communicated with fluid mixture in thermal contact and filled with calibration fluid as function of propagation velocity of ultrasonic wave Download PDFInfo
- Publication number
- DE102012224096A1 DE102012224096A1 DE201210224096 DE102012224096A DE102012224096A1 DE 102012224096 A1 DE102012224096 A1 DE 102012224096A1 DE 201210224096 DE201210224096 DE 201210224096 DE 102012224096 A DE102012224096 A DE 102012224096A DE 102012224096 A1 DE102012224096 A1 DE 102012224096A1
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- fluid mixture
- fluid
- ultrasonic wave
- arrangement
- calibration
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- 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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/32—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise
- G01N29/326—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise compensating for temperature variations
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- 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
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- 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
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- 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)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
Die Erfindung betrifft eine Anordnung zur Ermittlung einer Konzentration eines Bestandteils eines Fluidgemisches mit einem Ultraschallwandler und einer Hauptkammer, welche an ihrem ersten Ende den Ultraschallwandler aufweist und an ihrem zweiten Ende einen ersten Ultraschallwellenreflektor aufweist. The invention relates to an arrangement for determining a concentration of a component of a fluid mixture with an ultrasonic transducer and a main chamber which has the ultrasonic transducer at its first end and at its second end has a first ultrasonic wave reflector.
Mit Hilfe von Ultraschallwellen ist es möglich, Flüssigkeiten anhand ihrer charakteristischen Schallgeschwindigkeit zu identifizieren (Impuls-Echo-Verfahren). Dazu wird die Laufzeit gemessen, die die Ultraschallwelle für einen vorgegebenen Laufweg benötigt. Zur Unterscheidung von verschiedenen Konzentrationen eines Flüssigkeitsgemisches oder von verschiedenen Flüssigkeiten wird der Unterschied in der Laufzeit ausgewertet. Dieser Unterschied in der Laufzeit liegt im Mikrosekundenbereich. Je länger die Laufzeit desto größer ist der Unterschied in der Laufzeitdifferenz bei gleichen Konzentrationen. With the help of ultrasonic waves, it is possible to identify liquids by their characteristic speed of sound (impulse-echo method). For this purpose, the transit time is measured, which requires the ultrasonic wave for a given path. To distinguish between different concentrations of a liquid mixture or of different liquids, the difference in the transit time is evaluated. This difference in runtime is in the microsecond range. The longer the runtime, the greater the difference in the transit time difference for the same concentrations.
In Kraftfahrzeugen wird das Impuls-Echo-Verfahren beispielsweise zur Füllstandsmessung zur Ermittlung einer Menge eines Fluids in einem Tank verwendet. Weiterhin wird das Impuls-Echo-Verfahren verwendet um die Konzentration von Fluidgemischen, insbesondere Zwei-Komponenten-Gemischen, zu ermitteln. In motor vehicles, the pulse echo method is used, for example, for level measurement for determining an amount of a fluid in a tank. Furthermore, the pulse-echo method is used to determine the concentration of fluid mixtures, in particular two-component mixtures.
Allerdings ist die Laufzeit der Ultraschallwelle im flüssigen Medium nicht nur eine Funktion der Konzentration einer Flüssigkeitskomponente des Fluidgemisches sondern auch einen Funktion der Temperatur des Fluidgemisches. Daher ist es bei bekannten Anordnungen zur Ermittlung einer Konzentration eines Bestandteils eines Fluidgemisches notwendig die Temperatur mit einem zusätzlichen Temperatursensor zu bestimmen. Dieser Temperatursensor ist im Tank angeordnet und er wird von dem Fluidgemisch umströmt, um dessen Temperatur zu bestimmen. Der Temperatursensor muss in den Tank integriert werden und es muss eine Durchführung geschaffen werden, um die Signale des Temperatursensors an eine nachfolgende elektronische Auswerteeinheit weiterzuleiten. Solche Durchführungen sind aufwendig, da sie sehr lange dicht sein müssen und den anspruchsvollen Anforderungen zum Beispiel beim Einsatz im Kraftfahrzeug genügen müssen. However, the duration of the ultrasonic wave in the liquid medium is not only a function of the concentration of a liquid component of the fluid mixture but also a function of the temperature of the fluid mixture. Therefore, in known arrangements for determining a concentration of a component of a fluid mixture, it is necessary to determine the temperature with an additional temperature sensor. This temperature sensor is arranged in the tank and it is flowed around by the fluid mixture to determine its temperature. The temperature sensor has to be integrated in the tank and a feedthrough has to be provided to pass the signals from the temperature sensor to a subsequent electronic evaluation unit. Such feedthroughs are expensive, since they must be tight for a very long time and must meet the demanding requirements, for example when used in motor vehicles.
Es ist eine Aufgabe der Erfindung, eine Anordnung zur Ermittlung einer Konzentration eines Bestandteils eines Fluidgemisches anzugeben, die kostengünstig Herstellbar ist und bei der die Abdichtung des Tanks möglichst einfach und dauerhaft ausgebildet ist. It is an object of the invention to provide an arrangement for determining a concentration of a component of a fluid mixture, which is inexpensive to produce and in which the sealing of the tank is formed as simple and durable as possible.
Die Aufgabe wird durch eine Anordnung zur Ermittlung einer Konzentration eines Bestandteils eines Fluidgemisches nach dem unabhängigen Anspruch gelöst. The object is achieved by an arrangement for determining a concentration of a component of a fluid mixture according to the independent claim.
Dadurch, dass die Anordnung zusätzlich eine Hilfskammer aufweist, die mit dem Fluidgemisch in thermischem Kontakt steht und die mit einem Eichmedium oder einem Eichfluid mit bekannter Abhängigkeit der Schallgeschwindigkeit einer Ultraschallwelle in dem Eichfluid von der Temperatur des Eichfluides gefüllt ist, kann mit Hilfe des Ultraschallwandlers die in dem Fluidgemisch herrschende Temperatur festgestellt werden. Es ist kein separater Temperatursensor notwenden, der in den Tank eingebaut werden müsste und eine Durchführung für seine Signalleitungen benötigen würde. Damit entfällt ein weiteres Bauteil und es werden keine Dichtungen benötigt, womit auch Leckagen des Flüssigkeitstanks ausgeschlossen werden. Characterized in that the arrangement additionally has an auxiliary chamber, which is in thermal contact with the fluid mixture and which is filled with a calibration medium or a calibration fluid with a known dependence of the speed of sound of an ultrasonic wave in the calibration fluid on the temperature of the calibration fluid, with the aid of the ultrasonic transducer be found in the fluid mixture prevailing temperature. There is no need for a separate temperature sensor that would need to be installed in the tank and would require a feedthrough for its signal lines. This eliminates another component and there are no seals needed, which also leaks of the liquid tank are excluded.
Wenn die Hilfskammer an ihrem ersten Ende mit dem Ultraschallwandler in akustischem Kontakt steht, kann die vom Ultraschallwandler erzeugte Ultraschallwelle problemlos in das Eichfluid in der Hilfskammer eingekoppelt werden. Wenn die Hilfskammer an ihrem zweiten Ende zweiten Ultraschallwellenreflektor aufweist, kann die Ultraschallwelle durch die Hilfskammer zurück zum Ultraschallwandler gelenkt werden. Die von dem zweiten Ultraschallwellenreflektor zurückgeworfene Ultraschallwelle kann dann aus der Hilfskammer problemlos an den Ultraschallwandler übertragen werden. When the auxiliary chamber is in acoustic contact with the ultrasonic transducer at its first end, the ultrasonic wave generated by the ultrasonic transducer can be easily coupled into the calibration fluid in the auxiliary chamber. If the auxiliary chamber has a second ultrasonic wave reflector at its second end, the ultrasonic wave can be directed through the auxiliary chamber back to the ultrasonic transducer. The reflected back from the second ultrasonic wave reflector ultrasonic wave can then be easily transferred from the auxiliary chamber to the ultrasonic transducer.
In Ausführungsformen weist die Hauptkammer in ihren Wandungen Öffnungen auf, durch die das Fluidgemisch in die Hauptkammer einströmen kann. Dadurch ist auf einfache Weise sichergestellt, dass das Fluidgemisch zur Konzentrationsbestimmung von der Ultraschallwelle durchstrahlt werden kann. In embodiments, the main chamber has in its walls openings through which the fluid mixture can flow into the main chamber. This ensures in a simple manner that the fluid mixture for determining the concentration can be irradiated by the ultrasonic wave.
Weitere Vorteile, Merkmale und Weiterbildungen ergeben sich aus dem nachfolgenden in Verbindung mit den Figuren erläuterten Beispielen. Further advantages, features and developments emerge from the following examples explained in conjunction with the figures.
Es zeigen: Show it:
Der Ultraschallwandler
Die Steuereinheit
Der Ultraschallwandler
Das Fluidgemisch
Der Ultraschallwandler
Von dem Ultraschallwandler
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 1 1
- Anordnung zur Ermittlung einer Konzentration Arrangement for determining a concentration
- 2 2
- Ultraschallwandler ultrasound transducer
- 3 3
- Fluidgemisch fluid mixture
- 4 4
- Hauptkammer main chamber
- 5 5
- erster Ultraschallwellenreflektor first ultrasonic wave reflector
- 6 6
- Hilfskammer auxiliary chamber
- 7 7
- Eichfluid calibration fluid
- 8 8th
- zweiter Ultraschallwellenreflektor second ultrasonic wave reflector
- 9 9
- Öffnung opening
- 10 10
- Wandung wall
- 11 11
- Ultraschallwelle ultrasonic wave
- 12 12
- Steuereinheit control unit
- 13 13
- Tank tank
- 14 14
- Tankdeckel filler cap
- 15 15
- elektrisches Signal electrical signal
- 16 16
- Temperatursensor temperature sensor
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE201210224096 DE102012224096A1 (en) | 2012-12-20 | 2012-12-20 | Arrangement for determining concentration of component of fluid mixture, has auxiliary chamber communicated with fluid mixture in thermal contact and filled with calibration fluid as function of propagation velocity of ultrasonic wave |
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Application Number | Priority Date | Filing Date | Title |
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DE201210224096 DE102012224096A1 (en) | 2012-12-20 | 2012-12-20 | Arrangement for determining concentration of component of fluid mixture, has auxiliary chamber communicated with fluid mixture in thermal contact and filled with calibration fluid as function of propagation velocity of ultrasonic wave |
Publications (1)
Publication Number | Publication Date |
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DE102012224096A1 true DE102012224096A1 (en) | 2014-06-26 |
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DE201210224096 Ceased DE102012224096A1 (en) | 2012-12-20 | 2012-12-20 | Arrangement for determining concentration of component of fluid mixture, has auxiliary chamber communicated with fluid mixture in thermal contact and filled with calibration fluid as function of propagation velocity of ultrasonic wave |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110714816A (en) * | 2018-07-11 | 2020-01-21 | 通用汽车环球科技运作有限责任公司 | Reflector of urea concentration sensor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4255964A (en) * | 1978-11-30 | 1981-03-17 | The Garrett Corporation | Fluid monitor |
DE69428254T2 (en) * | 1993-12-07 | 2002-06-27 | Marwal Systems Nanterre | Use of a device for acoustically measuring the composition of a two-component liquid mixture |
DE102008014300A1 (en) * | 2008-03-06 | 2009-09-10 | Technische Universität Dresden | Material mixture e.g. silica suspension, state and/or state change determining method, involves evaluating echo-bursts for determining ultrasonic attenuation and/or sound velocity, where echo-bursts are reflected by reflector surfaces |
DE102011102641A1 (en) * | 2011-05-27 | 2012-11-29 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Apparatus and method for the quantitative detection of a physical property of a liquid or gaseous sample medium |
-
2012
- 2012-12-20 DE DE201210224096 patent/DE102012224096A1/en not_active Ceased
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4255964A (en) * | 1978-11-30 | 1981-03-17 | The Garrett Corporation | Fluid monitor |
DE69428254T2 (en) * | 1993-12-07 | 2002-06-27 | Marwal Systems Nanterre | Use of a device for acoustically measuring the composition of a two-component liquid mixture |
DE102008014300A1 (en) * | 2008-03-06 | 2009-09-10 | Technische Universität Dresden | Material mixture e.g. silica suspension, state and/or state change determining method, involves evaluating echo-bursts for determining ultrasonic attenuation and/or sound velocity, where echo-bursts are reflected by reflector surfaces |
DE102011102641A1 (en) * | 2011-05-27 | 2012-11-29 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Apparatus and method for the quantitative detection of a physical property of a liquid or gaseous sample medium |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110714816A (en) * | 2018-07-11 | 2020-01-21 | 通用汽车环球科技运作有限责任公司 | Reflector of urea concentration sensor |
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Effective date: 20140903 |