DE10326159A1 - Container fluid level and properties sensor uses type 1-3 composite piezoelectric ultrasonic transducers with integrated processing circuit on conducting membrane curved to match wall - Google Patents
Container fluid level and properties sensor uses type 1-3 composite piezoelectric ultrasonic transducers with integrated processing circuit on conducting membrane curved to match wall Download PDFInfo
- Publication number
- DE10326159A1 DE10326159A1 DE2003126159 DE10326159A DE10326159A1 DE 10326159 A1 DE10326159 A1 DE 10326159A1 DE 2003126159 DE2003126159 DE 2003126159 DE 10326159 A DE10326159 A DE 10326159A DE 10326159 A1 DE10326159 A1 DE 10326159A1
- Authority
- DE
- Germany
- Prior art keywords
- container
- composite
- liquid
- wall
- piezo transducer
- 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.)
- Ceased
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 239000012528 membrane Substances 0.000 title claims abstract description 10
- 239000012530 fluid Substances 0.000 title abstract 2
- 239000007788 liquid Substances 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000002604 ultrasonography Methods 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 claims description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 239000012777 electrically insulating material Substances 0.000 claims 1
- 239000003562 lightweight material Substances 0.000 claims 1
- 239000007779 soft material Substances 0.000 claims 1
- 239000011888 foil Substances 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 2
- CVOFKRWYWCSDMA-UHFFFAOYSA-N 2-chloro-n-(2,6-diethylphenyl)-n-(methoxymethyl)acetamide;2,6-dinitro-n,n-dipropyl-4-(trifluoromethyl)aniline Chemical compound CCC1=CC=CC(CC)=C1N(COC)C(=O)CCl.CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O CVOFKRWYWCSDMA-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2968—Transducers specially adapted for acoustic level indicators
-
- 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
- G01N29/222—Constructional or flow details for analysing fluids
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
-
- 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
- G01N2291/02836—Flow rate, liquid level
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur Feststellung und/oder Überwachung des Füllstandes einer Flüssigkeit in einem Behälter, beziehungsweise der Überwachung von vorbestimmten Füllständen von Rohrleitungen sowie der Ermittlung der Transmissionseigenschaften einer Flüssigkeit wie zum Beispiel des Schlammgehaltes. Derartige Vorrichtungen werden zur Behälterüberwachung, zur Prozesskontrolle allgemein, aber auch als Luftblasendetektor in der Medizintechnik und in Abwasserbehandlungsanlagen benötigt.The The invention relates to a device for detection and / or monitoring the level of one liquid in a container, or monitoring of predetermined levels of Pipelines and the determination of the transmission properties a liquid such as the sludge content. Such devices are for container monitoring, for process control in general, but also as an air bubble detector in medical technology and in wastewater treatment plants.
Es sind bereits Vorrichtungen bekannt, die mit einem Ultraschallwandler, der auf der Behälterwand montiert ist und der ein piezoelektrisches Element enthält, das bei der Erregung durch einen Impuls mit einer vorgegebenen Länge und Amplitude einen Ultraschall-Sendeimpuls erzeugt, der über eine Membran auf die Behälterwand und damit auf die zu detektierende Flüssigkeit übertragen wird, und das Ultraschallschwingungen, die von der Membran auf den Ultraschallwandler übertragen werden, in elektrische Empfangssignale wandelt. Gleichzeitig werden aber auch über das Wandlergehäuse Ultraschallschwingungen auf die Behälterwand mit übertragen und in Empfangssignale vom piezoelektrischen Element umgewandelt. Ebenfalls führen Reflexionen von Schweißnähten oder Armaturen, die mit der Behälterwand verbunden sind, zu störenden Empfangsignalen.It Devices are already known which are equipped with an ultrasound transducer, the one on the container wall is mounted and which contains a piezoelectric element which when excited by a pulse of a given length and Amplitude an ultrasound transmission pulse generated that over a membrane on the container wall and thus transferred to the liquid to be detected, and the ultrasonic vibrations, which are transmitted from the membrane to the ultrasonic transducer, in electrical Converts received signals. At the same time, however, converter housing Transmit ultrasonic vibrations to the container wall and converted into received signals from the piezoelectric element. Likewise to lead Reflections from welds or Faucets with the tank wall are connected to disruptive Receive signals.
Damit eine Anordnung dieser Art zum Überwachen eines Füllstandes problemlos funktioniert, ist es wesentlich, dass eine gute akustische Kopplung zwischen dem piezoelektrischen Element und der zu überwachenden Flüssigkeit besteht.In order to an arrangement of this kind for monitoring a level works fine, it is essential that good acoustic Coupling between the piezoelectric element and the one to be monitored liquid consists.
Zwischen der Membran und der Flüssigkeit darf kein großer akustischer Sprung vorhanden sein. Luft oder Gaspolster dürfen nicht vor der Membran verbleiben.Between the membrane and the liquid not a big one there is an acoustic jump. Air or gas cushions are not allowed remain in front of the membrane.
Andere Vorrichtungen zur Überwachung eines Flüssigkeitsfüllstandes besitzen Schwingelemente, die von einem piezoelektrischem Element zu einer kontinuierlichen Schwingung angeregt werden dessen Frequenz und/oder Amplitude für die Erkennung des Füllstandzustandes ausgewertet werden.Other Monitoring devices a liquid level have vibrating elements made by a piezoelectric element its frequency is excited to a continuous oscillation and / or amplitude for the detection of the fill level be evaluated.
Werden Piezoelektrische Elemente von außen an Behälterwände montiert, sind besondere Vorkehrungen zu treffen um die Funktion zu gewährleisten.Become Piezoelectric elements mounted on the outside of the container walls are special Take precautions to ensure the function.
So
wird in der
Piezoelektrische Elemente mit planaren Schwingern liegen nicht vollflächig auf der Behälterwand auf. Sie koppeln weniger gut an die Behälterwand und damit an das Medium an. Ohne Zwischenschicht oder Membran können diese piezoelektrischen Elemente leicht zerstört werden.piezoelectric Elements with planar transducers do not lie on the entire surface the container wall on. They couple less well to the container wall and thus to the medium on. Without an intermediate layer or membrane, these can be piezoelectric Elements easily destroyed become.
Der Erfindung liegt die Aufgabe zugrunde, eine Anordnung der eingangs angegebenen Art so auszubilden, dass eine gute akustische Kopplung zwischen dem piezoelektrischen Element und dem zu überwachenden Medium über die Membran besteht und gleichzeitig alle Nachteile bekannter Anordnungen vermeidet.The The invention has for its object an arrangement of the beginning the specified type so that there is a good acoustic coupling between the piezoelectric element and the medium to be monitored via the There is membrane and all the disadvantages of known arrangements avoids.
Nach der Erfindung wird diese Aufgabe dadurch gelöst, dass das piezoelektrische Element mit seiner gesamten aktiven Fläche an der Behälterwand vollflächig anliegt. Mit einem piezoelektrischen 1-3 Komposit kann das piezoelektrische Element nahezu an jeder Behälterform vollflächig anliegen. Wird die Polymermatrix entsprechend dünn gewählt, können auch Rohre mit geringem Durchmesser umschlossen werden.To The invention solves this problem in that the piezoelectric Element lies with its entire active surface on the container wall. With a piezoelectric 1-3 composite, the piezoelectric Element on almost every container shape entire area issue. If the polymer matrix is chosen to be correspondingly thin, tubes with a small diameter can also be used Diameter are enclosed.
Mit dem 1-3 Komposit können auch nichtmetallische schalltransparente Behälter belegt werden, deren Wände nicht als Schwingelement wirken. Durch die auf der Behälterwand eng anliegenden 1-3 Komposite werden genügend Schallwellen in die Flüssigkeit eingekoppelt, um deren Anwesenheit festzustellen oder deren Eigenschaften zu überwachen.With the 1-3 composite can non-metallic sound-transparent containers are also used, the walls of which are not act as a vibrating element. Due to the 1-3 composites that are tightly fitting on the container wall will be enough Sound waves in the liquid coupled to determine their presence or their properties to monitor.
Die gegenüberliegende Behälterwand wird mit einem schallreflektierenden Material belegt.The opposing container wall is covered with a sound-reflecting material.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung eines Ausführungsbeispieles anhand der Zeichnungen. In den Zeichnungen zeigen:Further Features and advantages of the invention will appear from the following Description of an embodiment based on the drawings. The drawings show:
Wird der Piezowandler in einer federnden oder in einer den Behälter leicht anpassbaren Halterung befestigt, können auch Schläuche oder Kunststoffrohre überwacht werden.Becomes the piezo transducer in a springy or in a the container easily adjustable bracket attached, can also use hoses or Plastic pipes monitored become.
In einer weiteren, nicht dargestellten Ausführungsform, kann diese elektronische Schaltung aus einem oder mehreren integrierten Schaltkreisen bestehen. Auch eine monolithische Schaltung auf einem beliebigen Trägermaterial, wie z.B. Aluminiumoxid ist verwendbar. Bei der Fertigung des piezoelektrischen Elementes können diese mit in das Trägermaterial des 1-3 Komposits eingebettet werden.In a further embodiment, not shown, can be electronic Circuit consist of one or more integrated circuits. Also a monolithic circuit on any substrate, such as. Alumina can be used. When manufacturing the piezoelectric Element can these into the carrier material of the 1-3 composite be embedded.
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003126159 DE10326159A1 (en) | 2003-06-10 | 2003-06-10 | Container fluid level and properties sensor uses type 1-3 composite piezoelectric ultrasonic transducers with integrated processing circuit on conducting membrane curved to match wall |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003126159 DE10326159A1 (en) | 2003-06-10 | 2003-06-10 | Container fluid level and properties sensor uses type 1-3 composite piezoelectric ultrasonic transducers with integrated processing circuit on conducting membrane curved to match wall |
Publications (1)
Publication Number | Publication Date |
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DE10326159A1 true DE10326159A1 (en) | 2004-12-30 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE2003126159 Ceased DE10326159A1 (en) | 2003-06-10 | 2003-06-10 | Container fluid level and properties sensor uses type 1-3 composite piezoelectric ultrasonic transducers with integrated processing circuit on conducting membrane curved to match wall |
Country Status (1)
Country | Link |
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DE (1) | DE10326159A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8113047B2 (en) | 2004-12-13 | 2012-02-14 | Truma Geratetechnik Gmbh & Co. Kg | Ultrasonic measuring device for a container |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4613784A (en) * | 1984-12-21 | 1986-09-23 | The United States Of America As Represented By The Secretary Of The Navy | Transversely reinforced piezoelectric composites |
US4683396A (en) * | 1983-10-17 | 1987-07-28 | Hitachi, Ltd. | Composite ultrasonic transducers and methods for making same |
US4726099A (en) * | 1986-09-17 | 1988-02-23 | American Cyanamid Company | Method of making piezoelectric composites |
DE19621760A1 (en) * | 1995-06-29 | 1997-01-02 | Whitaker Corp | Ultrasonic liquid level detector |
DE19651752A1 (en) * | 1995-12-13 | 1997-06-19 | Whitaker Corp | Piezoelectric ultrasonic signals transducer with capacitively coupled earthing electrode e.g. for liquid level sensor |
DE19961857A1 (en) * | 1999-12-22 | 2001-06-28 | Endress Hauser Gmbh Co | Method for exciting Lamb waves in a plate, in particular in a container wall, and device for carrying out the method and for receiving the excited Lamb waves |
-
2003
- 2003-06-10 DE DE2003126159 patent/DE10326159A1/en not_active Ceased
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4683396A (en) * | 1983-10-17 | 1987-07-28 | Hitachi, Ltd. | Composite ultrasonic transducers and methods for making same |
US4613784A (en) * | 1984-12-21 | 1986-09-23 | The United States Of America As Represented By The Secretary Of The Navy | Transversely reinforced piezoelectric composites |
US4726099A (en) * | 1986-09-17 | 1988-02-23 | American Cyanamid Company | Method of making piezoelectric composites |
DE19621760A1 (en) * | 1995-06-29 | 1997-01-02 | Whitaker Corp | Ultrasonic liquid level detector |
DE19651752A1 (en) * | 1995-12-13 | 1997-06-19 | Whitaker Corp | Piezoelectric ultrasonic signals transducer with capacitively coupled earthing electrode e.g. for liquid level sensor |
DE19961857A1 (en) * | 1999-12-22 | 2001-06-28 | Endress Hauser Gmbh Co | Method for exciting Lamb waves in a plate, in particular in a container wall, and device for carrying out the method and for receiving the excited Lamb waves |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8113047B2 (en) | 2004-12-13 | 2012-02-14 | Truma Geratetechnik Gmbh & Co. Kg | Ultrasonic measuring device for a container |
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Legal Events
Date | Code | Title | Description |
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OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8122 | Nonbinding interest in granting licenses declared | ||
8110 | Request for examination paragraph 44 | ||
8131 | Rejection |