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DE2828016C2 - Method of measuring the concentration of a suspension - Google Patents

Method of measuring the concentration of a suspension

Info

Publication number
DE2828016C2
DE2828016C2 DE19782828016 DE2828016A DE2828016C2 DE 2828016 C2 DE2828016 C2 DE 2828016C2 DE 19782828016 DE19782828016 DE 19782828016 DE 2828016 A DE2828016 A DE 2828016A DE 2828016 C2 DE2828016 C2 DE 2828016C2
Authority
DE
Germany
Prior art keywords
suspension
measuring tube
concentration
measuring
vibrations
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.)
Expired
Application number
DE19782828016
Other languages
German (de)
Other versions
DE2828016A1 (en
Inventor
Theodor Prof. Dr. 3000 Hannover Rummel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fischer and Porter GmbH
Original Assignee
Fischer and Porter GmbH
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 Fischer and Porter GmbH filed Critical Fischer and Porter GmbH
Priority to DE19782828016 priority Critical patent/DE2828016C2/en
Publication of DE2828016A1 publication Critical patent/DE2828016A1/en
Application granted granted Critical
Publication of DE2828016C2 publication Critical patent/DE2828016C2/en
Expired legal-status Critical Current

Links

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
    • G01N29/032—Analysing fluids by measuring attenuation of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
    • 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
    • G01N2291/024—Mixtures
    • G01N2291/02408—Solids in gases, e.g. particle suspensions
    • 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

Landscapes

  • 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)

Description

3535

Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Anspruchs 1.The invention relates to a method according to the preamble of claim 1.

Bei einem bekannten Verfahren dieser Art werden piezokeramische Wandler zu mechanischen Schwingungen angeregt und es wird die Dämpfung dieser Schwingung in der Suspension gemessen, um ein der Konzentration der Suspension entsprechendes Signal zu erhalten. Das mit diesem Verfahren zu erhaltende Meßsignal ist, wenn auch geringfügig, von der Strömungsgeschwindigkeit der Suspension abhängig; außerdem ist das Signal nur verhältnismäßig aufwendig im Bezug auf die Konzentration der Suspension zu eichen.In a known method of this type, piezoceramic transducers become mechanical vibrations excited and the damping of this oscillation in the suspension is measured to one of the Concentration of the suspension to obtain the appropriate signal. The one to be obtained with this procedure The measurement signal is, albeit slightly, dependent on the flow velocity of the suspension; in addition, the signal is only relatively expensive in terms of the concentration of the suspension oak.

Aufgabe der Erfindung ist es, ein Verfahren eingangs genannter Art anzugeben, das mit einfachen Mitteln zu realisieren ist und ohne Einfluß der Strömungsgeschwindigkeit der Suspension bei verhältnismäßig einfacher Eichung zu praktisch zufriedenstellenden Ergebnissen gelangtThe object of the invention is to provide a method at the outset of the type mentioned, which can be implemented with simple means and without the influence of the flow rate the suspension to be practically satisfactory with a relatively simple calibration Results

Die Lösung dieser Aufgabe ist im Kennzeichen des Anspruchs 1 angegeben.The solution to this problem is given in the characterizing part of claim 1.

Die mechanischen Schwingungen des ideßrohrs stören die Strömung der Suspension durch das Meßrohr praktisch nicht Die aus der Messung des Schwingungsverhaltens des Meßrohrs gewonnenen Meßergebnisse ergeben ein eindeutiges Maß für die Konzentration. Eine Eichung ist ohne erhebliche Schwierigkeiten durchzuführen.The mechanical vibrations of the ideßrohr practically do not disturb the flow of the suspension through the measuring tube. The measurement results obtained from the measurement of the vibration behavior of the measuring tube result in a clear measure of concentration. A calibration is without significant difficulties perform.

Im folgenden werden zwei Vorrichtungen zur Durchführung des Verfahrens beschrieben.Two devices for carrying out the method are described below.

F i g. 1 zeigt eine Vorrichtung mit mechanischer Stoßanregung durch einen Klöppel.F i g. 1 shows a device with mechanical shock excitation by a clapper.

Fig.2 zeigt eine Vorrichtung mit magnetostriktiver Erregung.Fig.2 shows a device with magnetostrictive Excitement.

Durch das Meßrohr 2 in F i g. 1 strömt in Richtung der Pfeile die Suspension. Auf der einen Seite des Meßrohrs 2 ist um eine Achse 4 schwenkbar ein Klöppel 6 angeordnet, der gegen die Wirkung einer apparatefest verankerten Feder 8 mittels eines Zugmagneten 10 stoßweise an das t4eßrohr 2 geschlagen werden kann. Auf der anderen Seite ist an dem Meßrohr 2 ein Mikrofon 12 angebracht, das über ein Frequenzfilter 14 an eine Amplitudenmeß-Speicher- und Divisionsschaltung 16 angeschlossen ist. Zu zwei durch einen Zeitgeber 18 vorgegebenen Zeiten nach Erregung des Meßrohrs 2 durch den Klöppel 6 werden in der Schaltung 16 die Schwingungsamplituden erfaßt und durcheinander dividiert Der Quotient wird in ein Signal umgewandelt, das einer Auswerteschaltung 20 zugeführt wird. Dieses Signal ist ein Maß für die Konzentration der Suspension, die durch das Meßrohr 2 strömtThrough the measuring tube 2 in FIG. 1 flows in the direction of the Arrows the suspension. A clapper 6 is pivotable about an axis 4 on one side of the measuring tube 2 arranged, the against the action of a fixedly anchored spring 8 by means of a pull magnet 10 can be struck intermittently on the tube 2. On the other hand there is a 2 on the measuring tube Microphone 12 attached, through a frequency filter 14 to an amplitude measurement storage and division circuit 16 is connected. At two times predetermined by a timer 18 after the excitation of the Measuring tube 2 through the clapper 6, the vibration amplitudes are detected in the circuit 16 and divided by one another The quotient is converted into a signal which is fed to an evaluation circuit 20 will. This signal is a measure of the concentration of the suspension flowing through the measuring tube 2 flows

Durch das Meßrohr 30 in Fig.2 strömt die Suspension in Richtung der Pfeile. An einer Seite des Meßrohrs 30 ist ein Kern 32 eines magnetostriktiven Schwingers angesetzt, der durch einen Generator 34 stoßweise oder kontinuierlich zu erregen ist. An die andere Seite des Meßrohrs 30 ist ein Kern 36 eines magnetostriktiven Mikrofons angesetzt, das eine Auswerteschaltung 38 mit seinem Ausgangssignal beschickt. Die Auswertung kann so erfolgen, wie dies oben beschrieben wurde.The suspension flows through the measuring tube 30 in FIG. 2 in the direction of the arrows. On one side of the A core 32 of a magnetostrictive oscillator is attached to the measuring tube 30, which is generated by a generator 34 is to be excited intermittently or continuously. On the other side of the measuring tube 30, a core 36 is one Magnetostrictive microphone attached, which feeds an evaluation circuit 38 with its output signal. The evaluation can be carried out as described above.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (4)

Patentansprüche:Patent claims: 1. Verfahren zum Messen der Konzentration einer Suspeosion, insbesondere der Konzentration von in einem im wesentlichen nicht zähflüssigen Medium suspendierten Teilchen — vorzugsweise des Trokkengehalts einer Papierpampe —, bei dem die Suspension durch ein Meßrohr geschickt wird, bei dem ein mit der Suspension in Berührung stehender Körper zu mechanischen Schwingungen angeregt wird, das Abklingverhalten dieser Schwingungen gemessen und aus dem Meßsignal ein der Konzentration der Suspension entsprechendes Signal abgeleitet wird, dadurch gekennzeichnet, daß das Meßrohr selbst zu mechanischen Schwingungen angeregt wird.1. A method for measuring the concentration of a suspension, in particular the concentration of in particles suspended in an essentially non-viscous medium - preferably of the dry content a paper slurry - in which the suspension is sent through a measuring tube which stimulates a body in contact with the suspension to mechanical vibrations the decay behavior of these vibrations is measured and the concentration is derived from the measurement signal the signal corresponding to the suspension is derived, characterized in that that the measuring tube itself is excited to mechanical vibrations. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Amplitude der Schwingungen zu wenigstens zwei verschiedenen, in vorgegebenem zeitlichen Abstand von einer stoßweisen Erregung liegenden Zeiten gemessen und der Quotient der Meßwerte gebildet wird.2. The method according to claim 1, characterized in that the amplitude of the vibrations increases at least two different, at a predetermined time interval from intermittent excitation lying times measured and the quotient of Measured values is formed. 3. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 2 mit einem Organ zur Erregung des Körpers, gekennzeichnet durch einen Klöppel (6) zur stoßweisen Erregung des Meßrohrs (2).3. Apparatus for performing the method according to claim 2 with an organ for exciting the Body, characterized by a clapper (6) for intermittent excitation of the measuring tube (2). 4. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 3, dadurch gekennzeichnet, daß zur Messung des Abklingverhaitens des Meßrohrs (30) nach Abbruch der Erregung des Meßrohrs (30) ein als Mikrofon geschalteter magnetostriktiver Schwinger (32) oder ein gesondertes Mikrofon, etwa ein zweiter Schwinger (36), vorgesehen ist.4. Apparatus for performing the method according to claim 3, characterized in that for Measurement of the decay behavior of the measuring tube (30) after the excitation of the measuring tube (30) has been stopped A magnetostrictive transducer (32) switched as a microphone or a separate microphone, for example a second oscillator (36) is provided.
DE19782828016 1978-06-26 1978-06-26 Method of measuring the concentration of a suspension Expired DE2828016C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782828016 DE2828016C2 (en) 1978-06-26 1978-06-26 Method of measuring the concentration of a suspension

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782828016 DE2828016C2 (en) 1978-06-26 1978-06-26 Method of measuring the concentration of a suspension

Publications (2)

Publication Number Publication Date
DE2828016A1 DE2828016A1 (en) 1980-01-10
DE2828016C2 true DE2828016C2 (en) 1983-07-07

Family

ID=6042804

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19782828016 Expired DE2828016C2 (en) 1978-06-26 1978-06-26 Method of measuring the concentration of a suspension

Country Status (1)

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DE (1) DE2828016C2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192717B (en) * 1986-01-31 1990-01-31 Krivorozh Gornorudnyj I Method and apparatus for measuring parameters of solid phase of slurries
WO2004061426A1 (en) * 2003-01-07 2004-07-22 Nimtz Guenter Method and device for measuring density
ITVR20110123A1 (en) * 2011-06-07 2012-12-08 Hele All Adige INSTRUMENTED DEVICE FOR THE CHARACTERIZATION OF AN INTERNAL STRUCTURE OF A CHEESE BLOCK.
EP3064925A1 (en) * 2012-05-03 2016-09-07 Halliburton Energy Services, Inc. Single magnet fluid densitometer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2455749A1 (en) * 1974-11-26 1976-08-12 Juergen Frahm Sludge density measuring device - having electrical analog output, using ultra-sonic input

Also Published As

Publication number Publication date
DE2828016A1 (en) 1980-01-10

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8110 Request for examination paragraph 44
D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee