EP2291619A1 - Procédé et système de mesure pour déterminer et/ou surveiller le débit d un milieu à mesurer à travers un tube de mesure - Google Patents

Procédé et système de mesure pour déterminer et/ou surveiller le débit d un milieu à mesurer à travers un tube de mesure

Info

Publication number
EP2291619A1
EP2291619A1 EP09769099A EP09769099A EP2291619A1 EP 2291619 A1 EP2291619 A1 EP 2291619A1 EP 09769099 A EP09769099 A EP 09769099A EP 09769099 A EP09769099 A EP 09769099A EP 2291619 A1 EP2291619 A1 EP 2291619A1
Authority
EP
European Patent Office
Prior art keywords
ultrasonic
ultrasound
electromechanical
sensor
measuring
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.)
Withdrawn
Application number
EP09769099A
Other languages
German (de)
English (en)
Inventor
Andreas Berger
Achim Wiest
Finn Bloch Jensen
Rolf Sonderkamp
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.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec AG
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 Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP2291619A1 publication Critical patent/EP2291619A1/fr
Withdrawn legal-status Critical Current

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
    • G01F1/662—Constructional details
    • 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
    • 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
    • G01F1/668—Compensating or correcting for variations in velocity of sound
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters

Definitions

  • the present invention relates to methods for determining and / or monitoring the flow of a measuring medium through a measuring tube having a first ultrasonic sensor and at least one second ultrasonic sensor, which first ultrasonic sensor at least one eiektromechanisches ultrasonic Wandierelement and is mounted in a first region of the measuring tube and softer second Ultrasonic sensor has at least two electromechanical ultrasonic transducer elements and is mounted in a second region of the measuring tube so that the ultrasound signals transmitted by the first ultrasonic sensor are received by the second ultrasonic sensor and that the Uitraschallsignale sent by the second Uftraschailsensor are received by the first ultrasonic sensor , and with at least one control / evaluation unit, which sin based on the Uitraschail- measuring signals or on the basis of measurement data derived from the ultrasonic measurement signals d, the volume flow and / or the mass flow of the measuring medium flowing in the measuring tube are determined by means of a transit time difference method and a corresponding measuring system.
  • Uitraschall flowmeters are widely used in process and automation technology. They allow in a simple way to determine the volume flow and / or mass flow in a pipeline.
  • ultrasonic pulses are sent at a certain angle to the pipe axis both with and against the flow. From the transit time difference The flow rate and thus the known diameter of the piping section can be used to determine the volume flow.
  • Contaminants are present in this, so this principle is mainly used in contaminated liquids use.
  • the Ultraschallwelien be generated or received with the help of so-called ultrasonic transducer.
  • ultrasonic transducers are firmly attached to the pipe wall of the pipe section in question.
  • Ciamp-on ultrasonic flowmeter systems are also available. In these systems, the ultrasonic transducers are pressed against the pipe wall only with a tension lock. Such systems are for. Example, from EP 686 255 B1, US-A 44 84 478 or US-A 45 98 593 known.
  • a big advantage of clamp-on ultrasonic flowmeters is that they do not touch the medium being measured and are mounted on an existing pipeline.
  • a disadvantage is a high expenditure in the assembly of the clamp-on systems in order to align the individual Ultraschallwandier each other, which of many parameters, such as. Pipe wall thickness, pipe diameter, speed of sound in the medium to be measured.
  • the ultrasonic transducers usually consist of an electromechanical
  • the Converter in industrial process measurement usually a piezoceramic, and a Coupling layer, also called coupling wedge or rare precursor body.
  • the coupling layer is usually made of plastic.
  • the ultrasonic waves are generated and guided via the coupling layer to the pipe wall and from there into the liquid. Since the speeds of sound in liquids and plastics are different, the ultrasonic waves are refracted during the transition from one medium to another.
  • the angle of refraction is determined in a first approximation by the Sneil ''s law. The angle of refraction is thus dependent on the ratio of the propagation velocities in the media.
  • the adaptation layer assumes the function of the transmission of the ultrasonic signal and at the same time the reduction of a reflection caused by different acoustic impedances at boundary layers between two materials.
  • the flow rate of a measuring medium in a measuring tube on the drift of an ultrasonic signal is determined by the flow of the measuring medium in the measuring tube.
  • an ultrasonic flowmeter is disclosed with at least one Uitraschaliwandler in a first region of the measuring tube and at least two UltraschallaNwandlind in a second area. Due to the different distances of the transducers in the second region to that in the first region, a transit time difference of the ultrasonic signals results. This difference in transit time is used to calculate the flow.
  • the disadvantage is that the ultrasound transducer in the first region of the measuring tube an energy-intensive signal with high signal strength and wide
  • DE 102 21 771 A1 shows an ultrasonic sensor for an ultrasonic flowmeter with a plurality of piezoelectric elements, which are combined to form what is known as a piezo-array, which piezoelectric elements can be actuated with a time delay.
  • This makes it possible, with an ultrasonic sensor mounted flat on the measuring tube wall, to achieve different angles of the ultrasonic signal radiated into the measuring medium with a width front to the measuring tube axis.
  • the time-delayed driving is very computationally intensive. Even the change of the angle makes sense only in a limited area. If the ultrasound signal is radiated very flatly, longitudinal waves may be excited and the transmission through the tube wall is reduced and a significant portion of the sound wave is reflected.
  • the object of the invention is to provide a method and a corresponding flow measuring system whose sensors can be attached to a pipeline and require no complex mutual alignment.
  • the object is achieved by a method for determining and / or monitoring the flow of a measuring medium through a measuring tube with a first ultrasonic sensor and at least one second ultrasonic sensor, which first ultrasonic sensor has at least one electromechanical ultrasonic transducer element and is mounted in a first region of the measuring tube and which second ultrasound sensor has at least two electromechanical ultrasound transducer elements and is mounted in a second region of the measuring tube in such a way that the ultrasound signals transmitted by the first ultrasound sensor through the measurement medium are received by the second ultrasound sensor and if the ultrasound signal transmitted by the second ultrasound sensor through the measurement medium is received by the first ultrasound sensor are received, and with at least one control / evaluation unit, which sin based on the Uitraschall- or on the basis of measurement data derived from the ultrasonic measurement signals d, determines the volume flow and / or the mass flow of the measuring medium flowing in the measuring tube by means of a transit time difference method, wherein ultrasound signals are transmitted from the first ultrasonic sensor through the measuring medium to the second ultrasonic sensor
  • the ultrasonic sensors have coupling elements which bring about an angle between the ultrasonic wall-mounted elements mounted on them and the main flow direction of the measuring medium in the measuring tube, which usually runs approximately axially to the central axis of the measuring tube. This is how the ultrasound signal gets! between the sensors, a directional component in and / or against the main flow direction of the measuring medium in the measuring tube.
  • an ultrasound signal! Irradiate perpendicular to the pipe wall or pipe axis and yet can be determined by means of the transit time difference method, the flow.
  • the sensors are mounted or installed in different areas of the measuring tube.
  • the sensors are mounted on opposite sides of the measuring tube outer wall from the outside or they are located on the same side of the measuring tube and the signal is reflected on the opposite side of the measuring tube wall, preferably with a
  • Reflector on the inside of the measuring tube For inline systems, the sensors are usually located in fixed locations, fixed in or with the measuring tube wall.
  • the process variables determined during the diagnostic phase are, in particular, the signal strength of the received ultrasound signal, its amplitude, its amplitude
  • Phase position, the envelope or the transfer function Phase position, the envelope or the transfer function.
  • Derivable quantities are eg the intensity or the transit time of the ultrasonic signal.
  • the electromechanical ultrasonic transducer element is preferably a piezoelectric element.
  • eietrostrictive and / or magnetostrictive elements are also capable of generating and / or receiving suitable ultrasound signals.
  • a first ultrasonic sensor with at least one electromechanical ultrasonic transducer element is mounted in a first region of the measuring tube.
  • a second ultrasonic sensor is mounted in a second region of the measuring tube.
  • both sensors are attached to the outside of the measuring tube wall. The sensors are roughly aligned, i. their spacing is governed by a specific rule, e.g. at a distance from the size of the diameter of the measuring tube, roughly or in coarse steps. The cost of this device is very low compared to the prior art.
  • the optimum combination of ultrasonic transducer elements of the sensors for the measurement is determined. Even a non-optimal combination can be used for the measurement, but this measurement would be associated with a greater uncertainty.
  • exactly one ultrasound transducer element alternately transmits ultrasound signals.
  • the parameters determined and / or derived from the received ultrasound signals are determined individually for the receiving ultrasound transducer elements. This can be done in only one direction, ie from the first to the second ultrasonic sensor.
  • ultrasonic signals in both directions upstream and downstream can be included in the diagnostics because of a phase shift between the directional component signal in the main flow direction of the measurement medium in the measuring tube and the ultrasound signal! with directional component counter to the main flow direction of the medium to be evaluated in the measuring tube.
  • the diagnostic phase then consists of determining and / or deriving the process variables of all possible combinations of ultrasound transducer elements in both directions.
  • This phase there is a record with a description of the measurement results of all combinations during the diagnostic phase.
  • the best possible combination is selected and the process variables saved as reference values. These are now always available for comparison with a current measurement.
  • the diagnostic phase is possible before and after each measurement, but even during a measurement phase, the selection of active electromechanical ultrasonic transducer elements in the subsequent measurement phase can take place. By means of other transmission frequencies and / or other pulse sequences, this selection is possible, for example, without disturbing the measuring operation. Since a flow measurement takes place with the evaluation of individual ultrasound packets, either these measurements can be compared directly with the stored reference variables, or one or more measurements are taken for diagnosis between two parcels of the flow measurement.
  • This arrangement also allows the speed of sound in the medium to be determined easily. In the case of a known measuring medium, it is thus possible to determine its temperature or, if the temperature is known, it is thus possible to detect a change in the measuring medium.
  • the diagnosis can take place both in the case of flowing measuring medium and in the case of a so-called zero flow, ie, when the measuring medium is stationary in the measuring tube.
  • the diagnosis is advantageously carried out with a measuring medium flowing in the measuring tube, since in this case an interference signal, for example caused by a so-called tube wave, ie an ultrasound signal in the measuring tube itself or the measuring tube wall, can be better distinguished from the useful signal, ie the ultrasonic signal for diagnosis.
  • An advantageous development of the method according to the invention provides that, during the diagnostic phase, the electromechanical ultrasonic transducer elements of the second ultrasound sensor active in the subsequent measurement phase are selected for the greatest signal strength of the received ultrasound signals.
  • the ultrasound transducer element or ultrasound transducer elements having the largest received signal strength are selected.
  • a variant is that the Uitraschall transducer element is selected, which receives the largest signal strength.
  • many ultrasound transducer elements can be combined to both transmit and / or receive ultrasound signals, it is very advantageous to combine a plurality of ultrasound transducer elements together, in particular the selected ultrasound transducer and its direct neighbors and / or further ultrasound juxtaposed - Transducer elements.
  • the ultrasonic sensors each have matching layers between coupling elements and ultrasonic transducer elements, which, like a filter, are designed such that the proportions of the ultrasonic measuring signals, which in Ein standing. Direction of the Uitraschall measuring signals are oriented pass the matching layers approximately undisturbed, while the proportions of the ultrasonic measuring signals, which are oriented transversely to the input and / or Ausstrahlraum, are largely attenuated by the matching layers.
  • the first ultrasonic sensor has at least two electromechanical ultrasonic transducer elements and during the diagnostic phase the electromechanical ultrasonic transducer elements of the first ultrasonic sensor active in a subsequent measuring phase are selected.
  • the selection is made e.g. on the basis of the signal intensity of the ultrasound signals of the first sensor received by the second ultrasound sensor and / or the signal strength of the ultrasound signals received from the first ultrasound sensor which were transmitted by the second ultrasound sensor.
  • the electromechanical ultrasound transducer elements of the second ultrasound sensor active in the subsequent measurement phase are selected for the optimum phase difference between transmission and reception of the received ultrasound signal.
  • the electromechanical ultrasonic transducer elements of the second ultrasonic sensor active in the subsequent measuring phase are selected for the optimum phase difference between the ultrasonic signal received from the second ultrasonic sensor and the ultrasonic signal received from the first ultrasonic sensor.
  • the ultrasonic signal emitted by the first ultrasonic sensor Sent and received by the second ultrasound sensor it has at least one directional component in or against the
  • Main flow direction of the measuring medium in the measuring tube and the ultrasonic signal, which is sent from the second ultrasonic sensor and received by the first ultrasonic sensor is in opposite directions. It is used in this case that due to the flow of the measuring medium, phase differences occur in certain time segments of the two ultrasonic signals, in and against the flow.
  • the electromechanical ultrasonic transducer elements of the second ultrasonic sensor active in the subsequent measuring phase selected according to the optimum transfer function of the received ultrasonic signals.
  • a plurality of electromechanical ultrasound transducer elements of the first ultrasound sensor are activated simultaneously and / or a plurality of electromechanical ultrasound transducer elements of the second ultrasound sensor are simultaneously activated. This is particularly advantageous for directly adjacent ultrasound transducer elements.
  • the respectively active electromechanical ultrasonic transducer elements are switched by at least one M ultiplexer, wherein the multiplexer is controlled by the control / evaluation unit and wherein the electromechanical ultrasonic transducer elements of the first ultrasonic sensor and the electromechanical ultrasonic Wandierimplantation of the second ultrasonic sensor are connected to the control / evaluation unit.
  • a multiplexer is also a switch unit of a plurality of independently controllable individual switches.
  • An advantageous embodiment of the method according to the invention is that the process variable detected during the diagnostic phase is stored and that during the measurement phase the stored process variable is compared with the currently detected process variable, wherein when a certain deviation of the stored process variable from the currently detected process variable is exceeded, a renewed Diagnosis phase is initiated.
  • the comparison is possible with one and / or with several recorded process variables.
  • the flow can be calculated, for example, by means of the phase shift from transmitter to receiver in and against the direction of flow, while the optimum combination of ultrasound transducer elements is determined by means of the signal strength.
  • the combination of the ultrasonic Wandieretti can also be determined with the phase shift.
  • the object underlying the invention is achieved by a measuring system for determining and / or monitoring the flow of a measuring medium through a measuring tube having a first Uitraschatlsensor and at least a second ultrasonic sensor, which first Uitraschallsensor at least one eiektromechanisches ultrasonic transducer element and in a first region of the measuring tube is attachable and which second Uitraschallsensor has at least two eiektromechanische ultrasonic transducer elements and in a second region of the measuring tube is attachable so that the first Uitraschallsensor sendable by the measuring medium ultrasonic signals from the second Uitraschallsensor are receivable and that of the second Uitraschallsensor by the measuring medium sendable ultrasonic signals from the first ultrasonic sensor are receivable, and with at least one control / evaluation unit, which on the basis of the ultrasonic measurement signals or on the basis of measurement data, which from the Ultras Chall-measuring signals are derived,
  • the ultrasonic transducer elements are controlled by the control / evaluation unit. With several ultrasonic transducer elements on a Uitraschallsensor the signals are passed, for example via at least one Multipiexer. This Multipiexer is then also controlled by the control / evaluation.
  • the first ultrasonic sensor has at least two electromechanical ultrasonic transducer elements and during the diagnostic phase they are in one subsequent measurement phase active eieelektromechanischen ultrasonic transducer elements of the first Ultraschallaüsensors selectable.
  • a very advantageous development of the measuring system according to the invention is the fact that the measurement signals of eiektromechanischen ultrasonic wall leriata or the derivable from the measurement signals measurement data of exactly one Rege! - / Evaluation unit are evaluated, the active eiektromechanischen ultrasonic transducer elements by means of at least one Multiplexers of the control / evaluation are controllable.
  • the circuit of the active ultrasonic transducer elements is controllable by at least one multiplexer.
  • the control / evaluation unit which receives and processes the signals of the ultrasonic transducer elements, controls the multiplexer.
  • the combination of the active ultrasonic transducer elements is obtained according to the described method.
  • the individual ultrasonic wall elements sequentially transmit a predetermined signal.
  • the acquired process parameters are evaluated and the control / evaluation unit decides based on the specified criteria, soft combination of ultrasonic transducer elements is activated in the measurement phase.
  • a multiplexer is also a switch unit of a plurality of independently controllable individual switches.
  • the first ultrasonic sensor and the second ultrasonic sensor can be connected to one another via a detachable connection.
  • the first ultrasonic sensor and the second ultrasonic sensor in a common housing.
  • the housing can correspond to a defined housing protection, for example, it is dust, gas and / or waterproof.
  • the housing can not have any external moving parts.
  • the second coupling element is an integral part of the first Koppeieiements. Both ultrasonic sensors thus have a single monolithic coupling element.
  • the electromechanical ultrasonic transducer elements of the first ultrasonic sensor each have a first surface for transmitting and / or receiving ultrasonic signals, which first surfaces has a first surface area, and which electromechanical ultrasonic transducer elements of the second ultrasonic sensor each a second surface for transmitting and / or receiving ultrasound signals, the second surface having a second surface area, wherein the first surface area is unequal to the second surface area.
  • a plurality of electromechanical ultrasonic transducer elements of the second ultrasonic sensor taken together the surface of an electromechanical ultrasonic transducer element of the first ultrasonic sensor.
  • the magnitudes of the areas of the electromechanical ultrasound transducer elements of the first ultrasound sensor and those of the electro-mechanical ultrasound transducer elements of the second ultrasound sensor are in a ratio not equal to one another.
  • Preferred ratios are e.g. nine to ten or nineteen to twenty, etc.
  • a further advantageous development of the measuring system according to the invention provides that the electromechanical ultrasonic transducer elements of the first ultrasonic sensor have approximately constant first distances and that the electromechanical ultrasonic transducer elements of the second ultrasonic sensor have approximately constant second distances, wherein the first distances are not equal to the second distances.
  • the distances are usually based on the surface ridge points of U ⁇ traschall Wandlere ⁇ emente.
  • the center of area in this context is the geographical center or the center of gravity of the area. It is not so much the calculation of the centroid as such, but rather, that the area centers are calculated equally for all ultrasound transducer elements.
  • a plurality of electromechanical ultrasonic transducer elements can be activated simultaneously.
  • electromechanical ultrasonic transducer elements are then activated simultaneously, i. they are ready to send and / or ready to receive.
  • the first ultrasonic sensor has a coupling element which is designed such that an ultrasound signal transmitted by the electromechanical Uitraschail transducer element has a directional component in or against the main flow direction of the measuring medium in the measuring tube and / or that the second Ultrasonic sensor has a coupling element, which is designed so that an ultrasound signal sent from the electromechanical ultrasonic transducer element has a directional component in or against the main flow direction of the measuring medium in the measuring tube.
  • An advantageous embodiment of the invention provides that the active in the measuring phase electromechanical ultrasonic transducer elements of the first UltraschallaNsensors and / or the second ultrasonic sensor, from the outside, ie from an external unit, are selectable, for example by the user himself via a corresponding interface or an external field device, via a analog frequency or current input, electromechanical via switch or digitally adjustable via a signal.
  • Fig. 1 shows a longitudinal section of a measuring tube with inventive measuring system
  • Fig. 2 shows a distributor circuit according to the invention
  • Fig. 3 shows in longitudinal section two ultrasonic sensors of an inventive
  • FIG. 4 shows a flowchart of the method according to the invention
  • FIG. 5 shows a further distributing circuit according to the invention.
  • FIG. 1 an inventive measuring system 1 with two ultrasonic sensors 2, 3, which are mounted on a measuring tube 4, shown. Both ultrasonic sensors 2, 3 have a plurality of ultrasonic transducer elements 6.1-6.6, 7.1 -7.6. So these are so called
  • Transducer arrays not to be confused with arrays in individual sensors. With a single combination of individually operable ultrasonic transducer elements 6.1 - 6.6, 7.1 - 7.6, the flow measurement can be performed. The selection and positioning of the sensors 2, 3 is facilitated by the variety of possible combinations.
  • the ultrasonic sensors 2, 3 are mounted on the same outside of the measuring tube 4. Their ultrasound Wandier instituten 6.1 -6.6, 7.1-7.6 face each other at an angle so that the ultrasound signal emitted by them 10 is passed through the measuring medium 5 to the respective other ultrasonic sensor 2, 3. A directional component of the ultrasound signal 10 points in the direction of the main flow direction of the measuring medium 5 in the measuring tube 4. Thus, a transit time difference can be measured with mutual transmission and reception, via which the flow velocity of the measuring medium 5 in the measuring tube 4 and thus the flow can be determined.
  • the UltraschallaSI transducer elements 6.1-6.6 have a distance 11 to each other.
  • the ultrasonic transducer elements 7.1-7.6, however, have a distance 12 to each other.
  • the distances 11, 12 are considered to be approximately constant, are but not the same. In this embodiment, the distances 11 are 10mm and the distances 12 9mm.
  • the diagnostic phase of the measuring system 1 is preceded by the structure of the measuring system 1.
  • the clam-on ultrasonic sensors 2, 3 on the outside of the measuring system 1 are preceded by the structure of the measuring system 1.
  • one after the other of the ultrasonic transducer elements 6.1-6.6 is activated or activated and excited to transmit a presettable Uitraschalisignals.
  • a presettable Uitraschalisignals e.g. the signal strength of the received ultrasonic signals for each ultrasonic transducer element 7.1-7.6 measured individually.
  • This can be done both sequentially, i. by sequentially measuring all possible Kombinatäonen, as well as done simultaneously.
  • the illustrated embodiment of the measuring system 1 according to the invention only the sequential measurement is possible.
  • the same procedure may be repeated in the other direction, ie, transmit the ultrasonic transducer elements 7.1-7.6 and receive the Uitraschall transducer elements 6.1-6.6.
  • the optimal pair which guarantees eg the maximum signal strength, is selected for the measurement.
  • the measured process parameters are stored.
  • only the selected ultrasonic transducer elements 6.1 -6.6, 7.1 -7.6 are activated to determine the flow.
  • the other ultrasonic Wandieretti 6.1-6.6, 7.1-7.6 continue to be excited, for example, with a significantly different frequency to the measurement frequency.
  • the information about the ongoing measurement and / or diagnosis phases and / or their results or findings can also be provided, e.g. on a display, or an alarm signal can be output if the measurement conditions change.
  • the ultrasonic sensors 2, 3 are, as shown in FIG. 2, connected to multiplexers 9.1-9.4, which respectively activate two opposing ultrasonic transducer elements 6.1-6.6, 7.1-7.6.
  • the multiplexers 9.1 - 9.4 are controlled by the control / evaluation unit 8.
  • the ultrasonic transducer elements 6.1-6.6, 7.1-7.6 are shown in Fig. 2 only schematically. There is only one combination, i. a pair of ultrasonic transducer elements 6.1-6.6, 7.1-7.6 are activated, i. sends only one ultrasonic Wandiereiement 6.1 -6.6 and receives an ultrasonic transducer element 7.1-7.6 and / or vice versa.
  • the advantage lies in the small amount of data to be processed.
  • the control / evaluation unit 8 must always process only one signal.
  • the control of the multiplexer 9.1-9.4 is also control / evaluation 8 taken over.
  • FIG. 3 discloses an inventive measuring system 1 with two opposing, mounted on the same side of the measuring tube 4 Ultraschallaüsensoren 2, 3. Again, the coupling elements 13, 14 an angle between the ultrasonic wall lerimplantationn 6, 7.7-7.21 and the measuring tube. 4 , so that the UStraschallsignale, not shown here for clarity, have a direction component in the main flow direction of the measuring medium in the measuring tube 4.
  • the ultrasonic transducer 2 transmits ultrasonic signals to the ultrasonic transducer 3 and vice versa.
  • the signal strengths and / or further process parameters received by the ultrasound transducer elements 7.7-7.21 are compared with each other and the ultrasound transducer element 7.7-7.21 at which the process parameters most suitable for the measurement are applied are selected for the measurement and thus the signal path for the measurement is determined , But also the combination of several adjacent elements 7.7-7.21 is conceivable.
  • the ultrasonic transducers 2, 3 have different sized Ultraschallail-Wandlausemente 6, 7.7-7.21.
  • the approximately square ultrasound transducer element 6 measures 8x8mm by way of example, while the size of the ultrasound transducer elements 7.7-7.21 is 2x8mm in each case.
  • four adjacent ultrasonic transducer elements 7.7-7.21 are switched together active. This is usually done with the direct neighbors of the Uitraschall- transducer element 7.7-7.21 with the most suitable process parameters.
  • the ultrasonic transducers 2, 3 have different sized Ultraschallail-Wandlereiemente 6, 7.7-7.21.
  • the approximately square ultrasound transducer element 6 measures 8x8mm by way of example, while the size of the ultrasound transducer elements 7.7-7.21 is 2x8mm in each case.
  • four adjacent ultrasonic transducer elements 7.7-7.21 are switched together active. This is usually done with the direct neighbors of the Uitraschall- transducer element 7.7-7.
  • FIG. 4 shows a flow chart of the method described.
  • the start of the diagnostic phase is preceded by the installation and coarse positioning of the ultrasonic sensors 2, 3.
  • Analogous to Fig. 1 would have the Wandlereiemente of first ultrasonic sensor 2 with 6.i and the transducer elements of the second Uitraschailsensors be denoted by 7.j.
  • the comparison of the process parameters P 1 all combinations provides the most suitable combination of ultrasonic transducer elements. With these, the measurement is completed.
  • the measurement can then be interrupted again from diagnosis phases from time to time, eg, time-controlled and / or user-controlled and / or process-controlled.
  • diagnosis may take place during the measurement phase and / or by the evaluation of the measurement signals themselves.
  • Electromechanical Ultrasonic Transducer Elements 6 Electromechanical Ultrasound Transducer Elements

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un système de mesure (1) et un procédé permettant de déterminer et/ou de surveiller le débit d'un milieu à mesurer (5) à travers un tube de mesure (4) au moyen d'un premier capteur d'ultrasons (2) et au moins d'un deuxième capteur d'ultrasons (3), le premier capteur d'ultrasons (2) comportant au moins un élément électromécanique de conversion d'ultrasons (6.1-6.6) et le deuxième capteur d'ultrasons (3) comportant au moins deux éléments électromécaniques de conversion d'ultrasons (7.1-7.6). Les signaux ultrasonores pouvant être émis par le premier capteur d'ultrasons (2) à travers le milieu à mesurer (5) peuvent être reçus par le deuxième capteur d'ultrasons (3) et les signaux ultrasonores pouvant être émis par le deuxième capteur d'ultrasons (3) à travers le milieu à mesurer peuvent être reçus par le premier capteur à ultrasons (2). Au moins une unité de régulation/d'évaluation détermine le débit volumétrique et/ou massique du milieu à mesurer (5) s'écoulant dans le tube de mesure (4) au moyen d'un procédé de différence de temps de propagation. Durant une phase de diagnostic, le premier capteur d'ultrasons (2) envoie des signaux ultrasonores à travers le milieu à mesurer (5) au deuxième capteur d'ultrasons (3) et au moins une variable de processus est déterminée par les signaux ultrasonores reçus pour chaque élément électromécanique de conversion d'ultrasons (7.1-7.6) du deuxième capteur d'ultrasons (3) et, en raison de la variable de processus des signaux ultrasonores reçus, on sélectionne, parmi les éléments électromécaniques de conversion d'ultrasons (7.1-7.6) du deuxième capteur d'ultrasons (3), celui qui sera actif au cours d'une phase de mesure suivante.
EP09769099A 2008-06-25 2009-06-02 Procédé et système de mesure pour déterminer et/ou surveiller le débit d un milieu à mesurer à travers un tube de mesure Withdrawn EP2291619A1 (fr)

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DE102008029772A DE102008029772A1 (de) 2008-06-25 2008-06-25 Verfahren und Messsystem zur Bestimmung und/oder Überwachung des Durchflusses eines Messmediums durch ein Messrohr
PCT/EP2009/056731 WO2009156250A1 (fr) 2008-06-25 2009-06-02 Procédé et système de mesure pour déterminer et/ou surveiller le débit d’un milieu à mesurer à travers un tube de mesure

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US (1) US8347734B2 (fr)
EP (1) EP2291619A1 (fr)
CN (1) CN202092690U (fr)
DE (1) DE102008029772A1 (fr)
RU (1) RU2478190C2 (fr)
WO (1) WO2009156250A1 (fr)

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DE102008029772A1 (de) 2009-12-31
US20110094309A1 (en) 2011-04-28
US8347734B2 (en) 2013-01-08
RU2478190C2 (ru) 2013-03-27
RU2011102597A (ru) 2012-07-27
CN202092690U (zh) 2011-12-28
WO2009156250A1 (fr) 2009-12-30

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