WO2009129886A1 - Procédé de détermination de la concentration d'un milieu et appareil de mesure approprié - Google Patents

Procédé de détermination de la concentration d'un milieu et appareil de mesure approprié Download PDF

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Publication number
WO2009129886A1
WO2009129886A1 PCT/EP2009/001252 EP2009001252W WO2009129886A1 WO 2009129886 A1 WO2009129886 A1 WO 2009129886A1 EP 2009001252 W EP2009001252 W EP 2009001252W WO 2009129886 A1 WO2009129886 A1 WO 2009129886A1
Authority
WO
WIPO (PCT)
Prior art keywords
sound
determination
measuring device
measuring
concentration
Prior art date
Application number
PCT/EP2009/001252
Other languages
German (de)
English (en)
Other versions
WO2009129886A8 (fr
Inventor
Thomas Will
Martin Deutscher
Original Assignee
Mib Gmbh Messtechnik Und Industrieberatung
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 Mib Gmbh Messtechnik Und Industrieberatung filed Critical Mib Gmbh Messtechnik Und Industrieberatung
Publication of WO2009129886A1 publication Critical patent/WO2009129886A1/fr
Publication of WO2009129886A8 publication Critical patent/WO2009129886A8/fr

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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
    • G01N2291/028—Material parameters
    • G01N2291/02809—Concentration of a compound, e.g. measured by a surface mass change

Definitions

  • the invention relates to a method for determining the concentration in a flowable medium with known mixing partners. Moreover, the invention relates to a measuring device for concentration determination in such a medium.
  • i Carrying out at least one sound propagation time measurement by means of an ultrasound measuring arrangement in which at least one ultrasound transceiver is arranged as a sensor for sound transmission of the measurement path and signal detection in the two end regions of a measurement path and determination of the temperature of the medium at at least one location Measuring section through a device for temperature determination; ii. Evaluation of the transient signal by a signal processing device in two different types: a. Determining a latest possible zero crossing by iterative calculation of regression lines formed from the height of adjacent amplitudes of the received signal; b. Calculation of a mean distance between actually measured zero crossings of the received signal and determination of metrologically non-detectable zero crossings; iii.
  • a measuring device which can be used in particular in the above method, which is provided as an ultrasonic measuring arrangement, in which at least one ultrasonic transceiver is arranged as a sensor for the transmission of the measuring path and for signal detection in the two end regions of a measuring path, and a signal processing device is arranged or connected to the ultrasound measuring device, which from the determination of amplitude heights and zero crossings of a received signal of the sensors allows a determination of the concentration of mixing partners of the medium.
  • the method and measuring device for achieving the above-mentioned object are based on the assumption that, in the case of a medium with known mixing partners and a given temperature, the speed of sound of the medium can be deduced from the concentration of the same. In this way, therefore, an ultrasonic measuring arrangement which determines a value for the speed of sound in the medium can be used to determine the concentration in the mixture.
  • flowmeters are known that work with ultrasound and determine a volume flow from runtime differences.
  • EP 0 452 531 a simple method for determining the transit time is known, which, however, requires a receiving signal which swells over a longer period of time at a constant pitch.
  • EP 0 233 047 discloses a general arrangement for measuring the speed of sound without, however, discussing metrological details there. From DE 10 2005 051 669 it is known that it is possible to greatly override the received signal, thereby triggering it to a certain extent To facilitate wave. This is sufficient to determine an approximate sound velocity of the medium in a flow meter operating according to the phase measurement method.
  • the method according to the invention proceeds as follows:
  • the medium is guided through a measuring section at which ultrasound transceiver devices are arranged in their end regions and the measuring path is sounded through, whereby at least one of the ultrasounds Transceiver devices a received signal is recorded, which can be used for the evaluation.
  • the sound propagation time measurement is carried out by measuring the individual amplitude peaks of the transient process. In this case, the time and the height of the amplitude peaks of the swelling received signal are recorded.
  • a zero crossing threshold is enabled, which can be used to record the time of the subsequent zero crossing of the received signal.
  • this operation is performed only from a certain minimum signal strength to avoid interference by the noise. It should be noted that, for example, the first amplitudes of the signal may still be so weak that they are very close to the noise and thus are not recognized.
  • the measurement of the amplitude peaks takes place in that one used a threshold switch with variable threshold.
  • This threshold is started at the amplitude maximum value and shuts down.
  • the highest amplitude peak is reached when, within a temporal expectation window for the received signal, a trigger intended for this purpose responds for the first time.
  • the further amplitude peaks of lesser height are detected by the fact that the trigger signal comes within a second, much smaller, temporal window before the previously measured amplitude peak.
  • the length and position of this temporal window depends on the ultrasound frequency.
  • the start trigger threshold can also be determined from the highest pulse amplitudes of the previous measurement.
  • a mean distance is calculated from the zero crossings of the received signal. Other zero crossings that are before the first detected zero crossing can be determined with this mean value of the distances. Although these times of the computed, so to speak "virtual" zero crossings are stable, a decision aid is needed here, which represents the beginning of the received signal, which provides the zero crossing determined from the straight lines of the amplitude peaks Sound transit time thus results from the Meeting point of the zero-crossing calculations, from which the speed of sound in the medium can be calculated.
  • the concentration of the participating mixing partners can be deduced by means of the sound velocity of the medium.
  • the determined value of the speed of sound is compared with the value triples of temperature, sound velocity and concentration stored for the mixture.
  • the measurement path is sounded through in both directions.
  • the method point ii- the evaluation of the zero crossings, optionally for both flow directions, both for the positive and for the negative half-wave of the received signal is performed. It must of course be noted that the zero crossings of the negative half-wave are shifted by half a wave. The measurement of the negative half-wave can also be done by inverting the transmission signal.
  • variable trigger threshold In order to make the measurement of the pulse heights reproducible, the variable trigger threshold must be stable. This is achieved by arranging a strong filter at the generator output of the threshold switch. With the procedure points outlined so can by a clever switching of the transmission direction and the phase angle of Transmit signal run all four measurements in parallel.
  • the mean value is then formed from the four measured values, whereby "outliers" can also be detected and ignored in the determination of the speed of sound.
  • the determined sound velocity value can be used for the compensation of the flow measurement according to the phase measurement principle.
  • one or more Schallaufzeittownen by means of an ultrasonic Messanord-tion is performed on a measuring section, in which in each of the two end portions of a measuring section at least one ultrasonic Sen- de receiver is arranged as a sensor for sound transmission through the signal path and detection and the temperature of the medium at at least one location of the measuring section determined by a device for temperature determination.
  • the following evaluation takes place with the received signals detected by the sensors: the highest amplitude peak AS1 is searched, its time and altitude are recorded and a zero-crossing switch is released.
  • the time of the amplitude peak AS1 subsequent zero crossing t ND i of the received signal is determined. Further amplitude peaks AS2, AS3,... And zero transitions t ND2 , t ND3 ,... Of the transient response are searched for and again, as before, times, heights and zero crossings determined. For each two adjacent amplitude peaks, for example in FIG. 1 for the amplitude peaks AS2 and AS3, in each case one straight line, in FIG. 1 the straight line g2, is calculated and its zero crossing, here t g2 , determined. The zero crossing closest to the beginning of the received signal with this method is then stored. From the zero crossings t ND i, t ND2 , t ND3 , ...
  • a mean distance is first calculated and then so-called “virtual" zero crossings of the received signal are calculated before the first measured zero crossing The "virtual" zero crossings are then determined unambiguously and stably the time of the beginning of the received signal.
  • This determination of the beginning of the received signal is carried out for both positive and negative half wave received signals for both directions of sound transmission, after which the sound velocity can be determined after an examination of the individual values for excessive deviations from the individual values.
  • the determination of the here four values of the beginning of the received signal can take place in parallel and provides a sound velocity value which permits a concentration determination of the medium.
  • the above invention thus relates to a method and a measuring device for determining the concentration in a flowable medium with known mixing partners, in which on the speed of sound of the transported medium, the concentration of the mixing partners is determined.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (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)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un procédé et un appareil de mesure utilisés pour déterminer la concentration d'un milieu coulant comprenant des partenaires de mélange connus. Selon ce procédé, la concentration en partenaires de mélange est déterminée par utilisation de la vitesse du son du milieu transporté.
PCT/EP2009/001252 2008-04-21 2009-02-20 Procédé de détermination de la concentration d'un milieu et appareil de mesure approprié WO2009129886A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008019991.5A DE102008019991B4 (de) 2008-04-21 2008-04-21 Konzentrationsbestimmungsverfahren und Messgerät
DE102008019991.5 2008-04-21

Publications (2)

Publication Number Publication Date
WO2009129886A1 true WO2009129886A1 (fr) 2009-10-29
WO2009129886A8 WO2009129886A8 (fr) 2010-01-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/001252 WO2009129886A1 (fr) 2008-04-21 2009-02-20 Procédé de détermination de la concentration d'un milieu et appareil de mesure approprié

Country Status (2)

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DE (1) DE102008019991B4 (fr)
WO (1) WO2009129886A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0233047A2 (fr) 1986-02-04 1987-08-19 Scottish & Newcastle plc Appareil pour mesurer la concentration d'un soluté
DE3825131A1 (de) 1988-07-23 1990-01-25 Schloemann Siemag Ag Anordnung zur messung der konzentration von oel-wasser-mischungen
EP0452531A1 (fr) 1990-04-20 1991-10-23 Siemens Aktiengesellschaft Dispositif électrique pour mesurer le temps de propagation d'un signal électrique
DE4023977A1 (de) 1990-07-25 1992-02-06 Thiel Wolfgang Dr Rer Nat Verfahren zur kontrolle und steuerung der konzentration von suspensionen, emolsionen und loesungen
US5119819A (en) * 1990-05-02 1992-06-09 Miles Inc. Method and apparatus for non-invasive monitoring of blood glucose
EP0732598A1 (fr) 1995-03-15 1996-09-18 SANYO ELECTRIC Co., Ltd. Senseur à ultrasons et appareil de pipettage utilisant un tel senseur
DE102004025243A1 (de) * 2004-05-22 2005-12-08 Robert Bosch Gmbh Bestimmung des Empfangszeitpunkts eines Ultraschallsignals mittels Pulsformerfassung
DE102005004331A1 (de) * 2005-01-31 2006-08-03 Robert Bosch Gmbh Ultraschallströmungssensor mit Modulo-2pi-Restnachführung
US20060185443A1 (en) * 2003-04-21 2006-08-24 Naotoshi Fujimoto Ultrasonic apparatus and method for measuring the concentration and flow rate of gas
JP2006275608A (ja) 2005-03-28 2006-10-12 Teijin Pharma Ltd 超音波伝播時間測定方法を用いた気体流量及び気体濃度の測定装置
DE102005051669B3 (de) 2005-10-28 2007-04-26 Mib Gmbh Messtechnik Und Industrieberatung Durchflussmessverfahren

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008001130U1 (de) * 2008-01-26 2008-04-03 Jäger, Frank-Michael Anordnung zur Bestimmung des Feststoffgehaltes von Flüssigkeiten

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0233047A2 (fr) 1986-02-04 1987-08-19 Scottish & Newcastle plc Appareil pour mesurer la concentration d'un soluté
DE3825131A1 (de) 1988-07-23 1990-01-25 Schloemann Siemag Ag Anordnung zur messung der konzentration von oel-wasser-mischungen
EP0452531A1 (fr) 1990-04-20 1991-10-23 Siemens Aktiengesellschaft Dispositif électrique pour mesurer le temps de propagation d'un signal électrique
US5119819A (en) * 1990-05-02 1992-06-09 Miles Inc. Method and apparatus for non-invasive monitoring of blood glucose
DE4023977A1 (de) 1990-07-25 1992-02-06 Thiel Wolfgang Dr Rer Nat Verfahren zur kontrolle und steuerung der konzentration von suspensionen, emolsionen und loesungen
EP0732598A1 (fr) 1995-03-15 1996-09-18 SANYO ELECTRIC Co., Ltd. Senseur à ultrasons et appareil de pipettage utilisant un tel senseur
US20060185443A1 (en) * 2003-04-21 2006-08-24 Naotoshi Fujimoto Ultrasonic apparatus and method for measuring the concentration and flow rate of gas
DE102004025243A1 (de) * 2004-05-22 2005-12-08 Robert Bosch Gmbh Bestimmung des Empfangszeitpunkts eines Ultraschallsignals mittels Pulsformerfassung
DE102005004331A1 (de) * 2005-01-31 2006-08-03 Robert Bosch Gmbh Ultraschallströmungssensor mit Modulo-2pi-Restnachführung
JP2006275608A (ja) 2005-03-28 2006-10-12 Teijin Pharma Ltd 超音波伝播時間測定方法を用いた気体流量及び気体濃度の測定装置
DE102005051669B3 (de) 2005-10-28 2007-04-26 Mib Gmbh Messtechnik Und Industrieberatung Durchflussmessverfahren

Also Published As

Publication number Publication date
DE102008019991A1 (de) 2009-10-29
WO2009129886A8 (fr) 2010-01-28
DE102008019991B4 (de) 2015-10-22

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