WO2006125722A1 - Verfahren zur bestimmung und/oder überwachung einer prozessgrösse - Google Patents
Verfahren zur bestimmung und/oder überwachung einer prozessgrösse Download PDFInfo
- Publication number
- WO2006125722A1 WO2006125722A1 PCT/EP2006/062131 EP2006062131W WO2006125722A1 WO 2006125722 A1 WO2006125722 A1 WO 2006125722A1 EP 2006062131 W EP2006062131 W EP 2006062131W WO 2006125722 A1 WO2006125722 A1 WO 2006125722A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- waveform
- piezoelectric element
- actual
- response signal
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
-
- 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
-
- 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
- G01F23/2962—Measuring transit time of reflected waves
Definitions
- the invention relates to a method for determining and / or monitoring a process variable.
- the process variable is preferably the volume or mass flow of a medium through a pipeline or through a channel.
- Corresponding ultrasonic flowmeters are offered and sold by the applicant.
- the process variable may also be the fill level of a filling material in a container, which is determined by means of an ultrasonic transit time method.
- the method according to the invention can be used in all measuring devices in which ultrasound measuring signals are transmitted and received.
- An in-line ultrasonic flowmeter is usually integrated in a pipeline in which a measuring medium flows.
- Ultrasonic flowmeters operating according to the transit time difference method have at least one pair of ultrasound sensors which transmit and / or receive ultrasound measurement signals along defined sound paths.
- a control / evaluation unit determines the volumetric and / or mass flow of the measuring medium in the pipeline on the basis of the difference between the propagation times of the measuring signals in the flow direction of the measuring medium and against the flow direction of the measuring medium.
- the measuring medium may be a gaseous or a liquid medium.
- clamp-on flowmeters are used, which are mounted on the outside of the pipeline and measure the volume or mass flow through the pipe wall.
- Ultrasonic flowmeters of the type described above, which determine the volume or the mass flow, are widely used in process and automation technology.
- Clamp-on flowmeters have the advantage of allowing the volume or mass flow in a container, e.g. in a pipeline, without any contact with the medium.
- Clamp-on flowmeters are described, for example, in EP 0 686 255 B1, US Pat. No. 4,484,478, DE 43 35 369 C1, DE 298 03 911 U1, DE 4336370 C1 or US Pat. No. 4,598,593.
- the ultrasound Measuring signals at a predetermined angle in the pipe in which the medium flows, irradiated or emitted from the pipe.
- the position of the ultrasonic transducers on the measuring tube (inline) or on the pipe (clamp-on) depends on the inside diameter of the measuring tube and the speed of sound of the measuring medium.
- the application parameters: pipe wall thickness and sound velocity of the piping material must also be taken into account.
- Ultrasonic sensors arranged so that the continuous sound paths are guided through the central region of the pipe or the measuring tube.
- the determined flow value thus reflects the mean flow rate of the medium to be measured.
- this averaging is too inaccurate. Therefore, it has also become known to provide a plurality of sensor pairs distributed over the circumference on the measuring tube or on the pipeline, as a result of which the flow information from various segmented angular regions of the measuring tube or the pipeline is available.
- the essential component of an ultrasonic sensor is a piezoelectric
- the essential component of a piezoelectric element is a piezoceramic layer, which is a film or a membrane.
- the piezoceramic is metallized at least in a partial area.
- An ultrasonic sensor would work ideally if the piezoelectric element exactly followed the electrical excitation signal - but this is not the case in practice. Rather, harmonics and resonances are usually excited by the excitation signal, which are superimposed on the actual so-called useful signal and change its signal form. As a result, the measurement accuracy of a measuring method based on the piezoelectric effect is sometimes considerably limited.
- the invention has for its object to propose a method with which an optimized signal / noise ratio is achieved in an ultrasonic sensor.
- a method which comprises the following method steps: a time-limited excitation signal, which is described by at least one nominal size or by a desired signal, is polarized to a first piezoelectric element or a first Zone of a piezoelectric element supplied; the response signal, which is described by at least one actual variable or actual waveform corresponding to the desired variable or to the desired signal form, is received by a second piezoelectric element or by a second polarized zone of the piezoelectric element; the actual size or the actual signal form of the response signal and the nominal size or the nominal waveform of the response signal are compared with each other;
- the excitation signal is modified so that the actual size or the actual waveform of the first piezoelectric element or from the first zone of the piezoelectric element emitted measurement signal is at least approximately equal to the target size or the nominal waveform of the response signal;
- the process variable is determined by a sound entrainment method or by an echo method on the basis of the measurement signal which can be described by the defined target variable or the defined nominal signal shape.
- the inventive method consists in the feedback - either in
- an ultrasonic measurement signal is generated by the use of piezoelectric elements or of piezoelectric films or membranes.
- Known piezoceramic elements are polarized and usually consist of a disc that is metallized on both sides.
- the deflection of the surface is done by applying an electrical voltage between the two metallized avengers.
- the reception of an ultrasonic measuring signal takes place via the reversal of the previously described process. This is possible because the process is reversible.
- the excitation signal described by the predetermined target size or the nominal waveform is generated, that the excitation signal is fed to a first polarized zone of the piezoelectric element that through the at least one actual variable or response signal described by the actual waveform is tapped in a second polarized zone of the piezoelectric element and that in the case of a deviation of the actual size or the actual waveform of the response signal of the target size or the Desired signal form of the response signal, the excitation signal is modified such that the response signal is at least approximately determined by the predefined desired size or the desired signal shape. is written.
- the method is realized in the simplest case via a feedback.
- At least one additional metallized and polarized zone is provided on the piezoelectric element according to the invention in a first embodiment.
- the voltage is measured, which is dependent on the deflection of the piezoelectric element.
- the piezoelectric element can be optimally adapted to the desired SOLL signal shape in its oscillation behavior.
- the output stage and the compensation circuit are preferably designed analogously for the sake of simplicity.
- the excitation signal described by the predetermined target size or nominal waveform is supplied to the first piezoelectric element; the response signal described by an actual quantity or actual signal waveform corresponding to the target quantity or to the desired signal form is subsequently tapped on the second piezoelectric element, which is spatially separated from the first piezoelectric element;
- the excitation signal is subsequently modified such that the response signal is at least approximately determined by the predetermined nominal size or nominal - Signal form can be described.
- a second piezoelectric element which is arranged in the sound path of the first piezoelectric element.
- This second piezoelectric element has a control function and measures the waveform emitted by the first piezoelectric element.
- the ultrasonic measurement signal is modified so that the first piezoelectric element emits the desired signal shape.
- the second piezoelectric element is thus used for the direct compensation of unwanted harmonics of the ultrasonic measurement signal.
- the desired waveform is set by means of an alternative method, which also makes it possible to compensate harmonics and resonances of the emitted ultrasonic measurement signal suitable.
- the ultrasound measuring signal emitted by the first piezoelectric element is likewise measured by a second piezoelectric element with a control function. The signal shape or another characteristic variable of the measured ultrasonic measurement signal is compared with a desired signal or nominal value.
- a development of the two aforementioned variants of the method according to the invention provides that the actual size or the actual waveform of the response signal by changing the voltage applied to the first zone of the piezoelectric element or by changing the voltage to the first piezoelectric Element applied voltage is modified.
- Voltage of the response signal is compared with the actual voltage of the response signal and that a deviation between the two voltages is corrected via a differential gain.
- An advantageous embodiment of the method according to the invention also provides that the desired signal waveform of the response signal is determined and stored as a function of the conditions prevailing in the process and / or in the system conditions in each case as a waveform of the excitation signal and that on the respectively prevailing Process and / or system conditions tuned waveform is used as the excitation signal for the at least one zone of the piezoelectric element or as an excitation signal for the first piezoelectric element.
- the determined under certain process and / or system conditions waveform is supplied as an excitation signal to the first piezoelectric element and that in case of a deviation of the waveform of the second piezoelectric element of the function of process and / or system conditions stored signal form of the excitation signal an error message is generated.
- a deviation from a previously determined under predetermined conditions correction of the ultrasonic measurement signal is used here for error detection.
- the piezoelectric element is a disk-shaped element which has two opposite end faces.
- the piezoelectric element is a foil or a membrane.
- the piezoelectric element in different zones on a mutually independent polarization;
- the zones with the independent polarization are arranged on the same end face of the piezoelectric element. This simplifies the wiring in many cases.
- the device suitable for carrying out the method according to the invention has a signal generator which supplies the time-limited excitation signal described by a variable or a signal form to the first polarized zone of the piezoelectric element. Furthermore, a correction circuit is provided which picks up the corresponding actual size or the corresponding actual signal form of the response signal from the second polarized zone of the piezoelectric element and compares it with the nominal size or the nominal waveform of the response signal; the correction circuit acts on the first polarized zone in the event of a deviation of the nominal size and actual size or the nominal waveform and the actual waveform of the response signal with a compensation signal which is dimensioned so that the actual size or the actual polarization zone
- the signal shape of the response signal is approximately equal to the nominal size or the nominal waveform of the response signal.
- an alternative embodiment of the device provides two piezoelectric elements, which are arranged in immediate proximity to each other.
- the second piezoelectric element is arranged in the sound path of the first piezoelectric element.
- a coupling medium is arranged between the two piezoelectric elements.
- a memory unit is provided in which the magnitudes or signal forms of the response signal are dependent on those in the Process and / or system prevailing conditions are stored.
- an evaluation unit determines a deviation of an actual quantity or an actual signal form of the response signal from the corresponding nominal value or recorded under defined process and / or system conditions.
- READ signal waveform of the response signal detects and generates a corresponding error message.
- FIG. 1 shows a plan view of the end face of a piezoelectric element known from the prior art
- Fig. Ia a cross-section according to the marking A-A in Fig. 1
- Fig. 2 a voltage signal which is used to excite a piezoelectric element of the prior art
- FIG. 3 shows a response signal to the voltage signal shown in FIG. 2
- FIG. 4 shows a first embodiment of a piezoelectric element with two differently polarized zones
- FIG. 4a shows a cross section according to the marking A-A in FIG. 4, [0034]
- FIG. 5 shows a second embodiment of a piezoelectric element with two differently polarized zones, [0034] FIG.
- Fig. 5a a cross section according to the marking A-A in Fig. 5, [0036]
- Fig. 6 a first circuit arrangement, which is used to drive a piezoelectric
- FIG. 7 is a second circuit arrangement suitable for driving a piezoelectric element with two differently polarized zones
- FIG. 8 shows a circuit arrangement for driving a first piezoelectric element
- FIG. a second piezoelectric element with compensation function is arranged downstream
- FIG. 9 shows a flow chart for carrying out a preferred variant of the method according to the invention.
- Fig. 1 shows a plan view of the end face 6 of a known from the prior art piezoelectric element 1.
- Fig. Ia shows the piezoelectric element 1 shown in Fig. 1 in cross section according to the characteristic drawing A-A.
- Such a piezoelectric element 1 is the essential component of an ultrasonic sensor, as used for example for flow measurement or for filling level and distance measurement.
- the piezoceramic layer forming the piezoelectric element 1 is a foil or a membrane with a conductive coating applied to both sides. For example, it has become known from the prior art that the two opposite end faces 5, 6 of the piezoelectric element 1 are differently polarized.
- the thickness T of the piezoelectric layer determines the natural frequency of the piezoelectric element.
- the piezoelectric element 1 is excited by means of an electrical excitation signal U (t) to vibrate.
- the functioning of an ultrasonic sensor is as ideal to classify when the emitted from the piezoelectric element 1 ultrasonic measurement signal in its waveform exactly the electrical excitation signal U (t) - but this is not the case in practice. Rather, by the excitation signal U (t) in addition to the fundamental frequency also harmonics and resonances are usually excited, which are superimposed on the actual so-called. Payload and change it in its waveform.
- An example is shown schematically in FIGS. 2 and 3. With reference to the response signal shown in Fig. 3
- FIG. 4 shows a first embodiment of a piezoelectric element 1 with two differently polarized zones 2, 4, which is suitable for carrying out a first variant of the method according to the invention.
- FIG. 5 shows a second embodiment of a piezoelectric element 1 suitable for carrying out the method according to the invention.
- FIGS. 4a and 5a each show the corresponding cross sections according to the marking A-A in FIGS. 4 and 5.
- two zones 2, 4 are provided with a different polarization on an end face 5 of the piezoelectric element 1. While the differently polarized zones 2, 4 are arranged concentrically in the embodiment shown in FIG. 4, the zones 2, 4 of the embodiment shown in FIG. 5 show an asymmetrical structure.
- the first zone 2 transmits a response signal U 11
- FIG. 8 an analog feedback circuit for driving a first piezoelectric element 1 is shown, which is arranged downstream of a second piezoelectric element 3 with compensation function. Between the two piezoelectric elements 1, 3 is a coupling medium 9, the properties of which are adapted to the properties of the two piezoelectric elements 1, 3 with regard to, for example, damping and reflection behavior.
- the second piezoelectric element 3, which is positioned in the sound path of the first piezoelectric element 1, delivers the response signal U 11
- the circuit arrangement shown in Fig. 7 differs by the additional memory unit 10 and the evaluation unit 11.
- This circuit is suitable for carrying out a preferred embodiment of the method according to the invention, in which the transient of the System is shortened. According to this embodiment, the desired signal becomes the response signal
- FIG. 9 shows a flow chart for carrying out a preferred variant of the method according to the invention, in which the actual signal form of the excitation signal is iteratively approximated to the desired signal form.
- an iterative approximation of the waveform of the emitted for determining a process variable ultrasonic measurement signal to the desired desired signal waveform of the excitation signal U (t) is achieved.
- the actual signal form of the excitation signal agrees with the desired signal form, later changes allow conclusions to be drawn regarding possible system or process errors.
- the program is started at point 20.
- the desired target Waveform applied as voltage signal U (t) to the first piezoelectric element 1. This thus assumes the function of a transmitter.
- the second piezoelectric element 3 receives the response signal at the program point 22
- the second piezoelectric element 3 has the function of a microphone.
- the desired signal waveform is analyzed and described by suitable parameters. These determined parameters are stored at point 25. Furthermore, the desired signal waveform is sampled, stored, or these data are already stored digitally under the program point 24.
- the first piezoelectric element 1 is acted upon at point 26 with a voltage signal U (t) having the stored desired signal waveform.
- the second piezoelectric element 3 measures the actual time profile of the stored desired signal waveform.
- the actual waveform of the response signal is sampled and stored.
- the sampled and stored at point 24 SOLL waveform of the excitation signal and the actual waveform of the response signal is phase-shifted and compared or correlated.
- the phase shift is necessary because the response signal to the excitation signal due to the transit time between the first piezoelectric element 1 and the second piezoelectric element 3 is shifted in time.
- a suitable algorithm e.g. via an FFT
- a corrected desired signal shape is determined at point 31. This corrected nominal signal shape is fed back to the program point 25 and stored.
- the program items 26 to 31 are successively run through until the actual signal form and the desired signal form coincide.
- FIG. 5 first end face
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Thermal Sciences (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/920,853 US8156792B2 (en) | 2005-05-23 | 2006-05-08 | Method and apparatus for ascertaining and/or monitoring a process variable |
EP06755076.4A EP1883791B1 (de) | 2005-05-23 | 2006-05-08 | Verfahren zur bestimmung und/oder überwachung einer prozessgrösse |
DK06755076.4T DK1883791T3 (en) | 2005-05-23 | 2006-05-08 | PROCEDURE FOR DETERMINING AND MONITORING A PROCESS VARIABLE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005024134.4 | 2005-05-23 | ||
DE102005024134A DE102005024134A1 (de) | 2005-05-23 | 2005-05-23 | Verfahren zur Bestimmung und/oder Überwachung einer Prozessgröße |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006125722A1 true WO2006125722A1 (de) | 2006-11-30 |
Family
ID=36918570
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2006/062131 WO2006125722A1 (de) | 2005-05-23 | 2006-05-08 | Verfahren zur bestimmung und/oder überwachung einer prozessgrösse |
Country Status (7)
Country | Link |
---|---|
US (1) | US8156792B2 (de) |
EP (1) | EP1883791B1 (de) |
CN (1) | CN100580386C (de) |
DE (1) | DE102005024134A1 (de) |
DK (1) | DK1883791T3 (de) |
RU (1) | RU2386928C2 (de) |
WO (1) | WO2006125722A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007045403A1 (de) * | 2007-09-21 | 2009-05-07 | Mobotix Ag | Tankbehälterüberwachungsvorrichtung |
DE102008029772A1 (de) * | 2008-06-25 | 2009-12-31 | Endress + Hauser Flowtec Ag | Verfahren und Messsystem zur Bestimmung und/oder Überwachung des Durchflusses eines Messmediums durch ein Messrohr |
BR112013004990A2 (pt) * | 2010-09-03 | 2016-05-31 | Los Alamos Nat Security Llc | aparelho e método para detectar não invasivamente pelo menos uma partícula em um fluido |
US10811590B1 (en) | 2016-06-23 | 2020-10-20 | Plastipak Packaging, Inc. | Containers with sensing and/or communication features |
DE102018127526A1 (de) * | 2018-11-05 | 2020-05-07 | Endress+Hauser SE+Co. KG | Vibronischer Multisensor |
Citations (3)
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US5883309A (en) * | 1995-03-15 | 1999-03-16 | Siemens Aktiengesellschaft | Adaptive optimization process for ultrasonic measurement signals |
EP1182452A2 (de) * | 1993-09-10 | 2002-02-27 | Gambro, Inc. | Methode und Gerät zur Detektion von Luftblasen |
DE10118934A1 (de) * | 2001-04-18 | 2002-10-31 | Hydrometer Gmbh | Kontrollvorrichtung für Ultraschallwandler |
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US3520186A (en) * | 1968-03-11 | 1970-07-14 | Nat Sonics Corp | Ultrasonic fluid interface sensing |
JPH03118780A (ja) * | 1989-09-29 | 1991-05-21 | Brother Ind Ltd | 超音波モータ |
DE69416129T2 (de) | 1994-10-10 | 1999-07-01 | Endress Hauser Gmbh Co | Ein Verfahren zum Betrieb eines Ultraschallwandlers und Schaltungsanordnung zur Durchführung des Verfahrens |
JP3659671B2 (ja) | 1994-10-13 | 2005-06-15 | セイコーインスツル株式会社 | 光ファイバ端面研磨機及び研磨方法 |
RU2082951C1 (ru) | 1995-08-29 | 1997-06-27 | Акционерное общество закрытого типа Центр промышленного приборостроения (АО ЦПП "Центрприбор") | Калибровочное устройство для ультразвукового расходомера |
DE19625667A1 (de) | 1996-06-26 | 1998-01-02 | Siemens Ag | Verfahren zum Selbsttest einer Einrichtung zur Ultraschall-Laufzeitmessung sowie Einrichtung zur Durchführung des Verfahrens |
DE19714973C2 (de) | 1997-04-10 | 1999-02-11 | Endress Hauser Gmbh Co | Verfahren und Anordnung zur Feststellung einer Überfüllung bei der Messung des Füllstands einer Flüssigkeit in einem Behälter nach dem Impulslaufzeitverfahren |
KR20000053591A (ko) * | 1999-01-25 | 2000-08-25 | 사토 요시하루 | 초음파센서를 사용하여 검출대상으로서의 용기내의 액체를검출하는 시스템 및 방법 |
WO2001067050A1 (en) * | 2000-03-09 | 2001-09-13 | Nest International N.V. | Simultaneous determination of multiphase flowrates and concentrations |
US7117134B2 (en) * | 2001-10-18 | 2006-10-03 | Lockheed Martin Corporation | Method to optimize generation of ultrasound using mathematical modeling for laser ultrasound inspection |
DE10254053B4 (de) | 2002-11-19 | 2016-12-22 | Endress + Hauser Flowtec Ag | Verfahren und Vorrichtung zur Bestimmung und/oder Überwachung eines Volumen- und/oder Massenstroms |
DE10314916A1 (de) * | 2003-04-01 | 2004-10-21 | Endress + Hauser Flowtec Ag, Reinach | Vorrichtung zur Bestimmung und/oder Überwachung des Volumen- und/oder Massenstroms eines Mediums |
DE10323063A1 (de) | 2003-05-20 | 2004-12-09 | Endress + Hauser Gmbh + Co. Kg | Verfahren zur Füllstandsmessung |
DE102004018507A1 (de) | 2004-04-14 | 2005-11-03 | Endress + Hauser Gmbh + Co. Kg | Piezo-elektrisches Element |
US7245059B2 (en) * | 2004-05-17 | 2007-07-17 | Xtero Datacom Inc. | Method of exciting a piezoelectric crystal |
DE102005022048A1 (de) * | 2005-05-09 | 2006-11-16 | Endress + Hauser Flowtec Ag | Vorrichtung zur Bestimmung und/oder Überwachung des Volumen- und/oder Massendurchflusses eines Messmediums |
DE102006000693A1 (de) * | 2006-01-02 | 2007-07-05 | Endress + Hauser Flowtec Ag | Vorrichtung zur Bestimmung und/oder Überwachung des Volumen- oder des Massedurchflusses eines Mediums |
US7926344B1 (en) * | 2006-12-20 | 2011-04-19 | Ortho-Clinical Diagnostics, Inc. | Ultrasonic fluid level sensing using a dry couplant |
-
2005
- 2005-05-23 DE DE102005024134A patent/DE102005024134A1/de not_active Withdrawn
-
2006
- 2006-05-08 US US11/920,853 patent/US8156792B2/en not_active Expired - Fee Related
- 2006-05-08 CN CN200680026756A patent/CN100580386C/zh not_active Expired - Fee Related
- 2006-05-08 EP EP06755076.4A patent/EP1883791B1/de not_active Not-in-force
- 2006-05-08 WO PCT/EP2006/062131 patent/WO2006125722A1/de active Application Filing
- 2006-05-08 RU RU2007147930/28A patent/RU2386928C2/ru not_active IP Right Cessation
- 2006-05-08 DK DK06755076.4T patent/DK1883791T3/en active
Patent Citations (3)
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EP1182452A2 (de) * | 1993-09-10 | 2002-02-27 | Gambro, Inc. | Methode und Gerät zur Detektion von Luftblasen |
US5883309A (en) * | 1995-03-15 | 1999-03-16 | Siemens Aktiengesellschaft | Adaptive optimization process for ultrasonic measurement signals |
DE10118934A1 (de) * | 2001-04-18 | 2002-10-31 | Hydrometer Gmbh | Kontrollvorrichtung für Ultraschallwandler |
Also Published As
Publication number | Publication date |
---|---|
DE102005024134A1 (de) | 2007-01-11 |
DK1883791T3 (en) | 2017-10-30 |
US8156792B2 (en) | 2012-04-17 |
RU2007147930A (ru) | 2009-06-27 |
CN100580386C (zh) | 2010-01-13 |
EP1883791B1 (de) | 2017-08-30 |
EP1883791A1 (de) | 2008-02-06 |
US20090211347A1 (en) | 2009-08-27 |
CN101228416A (zh) | 2008-07-23 |
RU2386928C2 (ru) | 2010-04-20 |
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