WO2019214955A1 - Dispositif de mesure pour la détermination d'une dimension d'un fluide - Google Patents

Dispositif de mesure pour la détermination d'une dimension d'un fluide Download PDF

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Publication number
WO2019214955A1
WO2019214955A1 PCT/EP2019/060588 EP2019060588W WO2019214955A1 WO 2019214955 A1 WO2019214955 A1 WO 2019214955A1 EP 2019060588 W EP2019060588 W EP 2019060588W WO 2019214955 A1 WO2019214955 A1 WO 2019214955A1
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WO
WIPO (PCT)
Prior art keywords
excitation
measuring tube
fluid
vibration
elements
Prior art date
Application number
PCT/EP2019/060588
Other languages
German (de)
English (en)
Inventor
Andreas Benkert
Michael MAYLE
Peter Ploss
Gerhard Lindner
Sabrina TIETZE
Original Assignee
Diehl Metering 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 Diehl Metering Gmbh filed Critical Diehl Metering Gmbh
Publication of WO2019214955A1 publication Critical patent/WO2019214955A1/fr

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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
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/18—Supports or connecting means for meters

Definitions

  • the invention relates to a measuring device for determining a fluid quantity concerning a fluid and / or a fluid flow of the fluid with a control device, a measuring tube receiving the fluid and / or a flow-through measuring tube and a first vibration transducer arranged on the measuring tube.
  • the invention relates to a method for producing a measuring device.
  • ultrasonic counters One way to detect flow or other fluid-related measures are ultrasonic counters.
  • at least one ultrasonic transducer is used to transmit an ultrasonic wave into the fluid flowing through the measuring tube
  • a flow rate through the measuring tube can be determined.
  • excitation of a model pure guided wave is highly relevant for use in an ultrasonic counter, since the angle at which compression vibrations are radiated into the fluid depends on the phase velocity of the guided wave, which are typically more excited in different excitation modes
  • Frequency is different. If different modes are excited, then result different propagation paths for the compression oscillations in the fluid, which can be calculated out at most by a complex signal evaluation.
  • the invention is therefore based on the object to provide a measuring device that uses guided waves for measurement, with a small space requirement and a simple construction of the measuring device used to be realized.
  • the first vibration transducer comprises a plurality of spaced apart on a supporting structure of the first vibration transducer mounted vibrating elements, wherein the side facing away from the support structure side surfaces of the vibrating elements for vibration coupling into the measuring tube directly or via a coupling element a respective excitation region of the measuring tube are coupled, wherein the
  • Oscillating elements are controllable by the control device to jointly excite a guided in a side wall of the measuring tube shaft, wherein the guided wave directly in the side wall or indirectly via the fluid to a arranged on the measuring tube second vibration transducer or back to the first
  • Vibration converter feasible and there by the control device for determining measurement data can be detected, wherein the fluid size by the control device in
  • the excitation regions and the excitation frequency can be matched to one another in such a way that a vibration mode to be damped is damped by a destructive interference, at least for one propagation direction.
  • a high mode purity of the excitation can be achieved by targeted attenuation of an undesired vibration mode.
  • a direction-dependent damping of the vibration mode take place.
  • Oscillating elements are positioned correctly to each other. To achieve this, will used according to the invention, a support structure, the oscillating elements of the first
  • Vibration transducer carries.
  • the production of the measuring device can be significantly simplified and in particular a degree of automation in the production can be increased.
  • the first oscillation converter that is to say in particular the supporting structure with the oscillating elements arranged thereon and optionally further components, can be produced separately and then converted into a simple one
  • the measurement data can be acquired in various ways to determine different fluid sizes. For example, the above-mentioned
  • a guided wave in the sidewall can be excited, which is suitable for exciting compression oscillations in the fluid, for example a Lamb wave.
  • the compression wave is in turn coupled by the fluid directly or after at least one reflection in a side wall and can be detected there by the second vibration transducer.
  • a guided wave in the sidewall can be excited, which is suitable for exciting compression oscillations in the fluid, for example a Lamb wave.
  • the compression wave is in turn coupled by the fluid directly or after at least one reflection in a side wall and can be detected there by the second vibration transducer.
  • Running time of the guided wave within the side wall can be measured, for example, by a Rayleigh wave in which oscillates substantially exclusively the outside of the side wall of the measuring tube, a Lamb wave, due to the
  • Sound velocity in the fluid can not be coupled into this, or the like can be excited, whereby the shaft is transported substantially exclusively through the side wall.
  • This can serve, for example, to measure a pressure of the fluid, since such a pressure can deform or distort the side wall and thus influence the speed of sound in the side wall.
  • a transit time of the shaft to the second vibration transducer or along a certain propagation path back to the first vibration transducer can be detected.
  • Measuring signals of individual vibrating elements can be moved in phase, it can be achieved that partial waves for some wavelengths destructively and overlap constructively for some wavelengths.
  • the vibrating members may be fixed to the supporting structure so as to be linearly spaced from each other.
  • the oscillating elements it is also possible for the oscillating elements to be curved and / or to be arranged concentrically with one another, for example.
  • a linearly spaced arrangement of, in particular, rectangular oscillation elements can in particular serve to emit substantially plane waves.
  • a concentric arrangement can be used, for example, to achieve a radially symmetric radiation or the like.
  • the measuring device makes it possible to carry out measurements on a fluid flow flowing through the measuring tube, but also on a fluid in the measuring tube.
  • a vibration transport for detecting fluid properties is known in principle in the prior art.
  • Amplitudes can also be frequency-dependent be evaluated and it can be evaluated absolute or relative amplitudes of certain spectral ranges to a spectrally different
  • Frequency bands can be evaluated in order, for example, to obtain information about the dispersion behavior of the measuring section.
  • information about the dispersion behavior of the pressure wave in the fluid and / or the dispersion behavior of the guided wave in the wall can be determined.
  • the fluid quantities that can be determined are, for example, a flow rate and / or a flow volume and / or a density, temperature and / or viscosity of the fluid. Additionally or alternatively, for example, a speed of sound in the fluid and / or a
  • Composition of the fluid for example, a mixing ratio of different components can be determined. Different approaches to gaining this
  • Fluid quantities from the above-explained measured variables are known in the prior art and are therefore not to be described in detail.
  • correlations between one or more measured variables and the fluid size can be determined empirically, and it is possible, for example, to use a look-up table or a corresponding formula to determine the fluid size.
  • the support structure is or preferably comprises a printed circuit board, wherein at least one electrode, preferably all electrodes, of each oscillating element is contacted by a respective conductor track of the printed circuit board.
  • the electrical contact between the electrode and the conductor track can be produced by a contact means, which mechanically supports the oscillation element on the support structure.
  • the vibrating element is exclusively via the connection of the Contact element with the electrode or the electrodes of the vibrating element held.
  • the electrodes can be soldered to the printed circuit board, glued with conductive adhesive or joined by bonding, for example by ultrasonic bonding.
  • conductor tracks of the printed circuit board electrical components can be contacted, which form part of the control device.
  • the control device can be formed in particular by a central device and at least one sub-control device, wherein the sub-control devices are assigned to the individual vibration transducers.
  • the components which form the sub-control device can be contacted by the conductor tracks of each printed circuit board which also carries the oscillation elements of the respective vibration converter.
  • the electrical components or parts of these components can in particular form a resonant circuit together with at least one of the oscillating elements.
  • the components can thus provide, for example, an inductance. They can also serve to buffer measuring or control signals, to perform a phase shift, to invert signals, to switch between different interconnections of electrodes of the individual oscillating elements, to perform a digital-to-analog conversion or an analog-to-digital conversion or the like.
  • the oscillating elements can be arranged on a side of the printed circuit board facing the measuring tube and / or the electrical components can be arranged at least partially on the side of the printed circuit board facing away from the measuring tube.
  • a plated-through printed circuit board is used, so that signals between the arranged on different sides of the circuit board components
  • the control device may be adapted to the first vibration transducer for exciting a guided through the side wall of the measuring tube total wave
  • the oscillation elements are driven to excite in the respective excitation regions in each case in the side wall guided partial waves, which to superimpose the total wave, wherein the predetermined by the support structure arrangement of the vibrating elements and the excitation frequency are chosen such that a vibration to be damped vibration mode is at least partially extinguished by a destructive interference of the partial waves at least in a direction of propagation.
  • the predetermined by the support structure arrangement of the vibrating elements and the excitation frequency are chosen such that a vibration to be damped vibration mode is at least partially extinguished by a destructive interference of the partial waves at least in a direction of propagation.
  • Vibration mode at the selected excitation frequency wherein the control device is adapted to perform the excitation of the vibrating elements of these excitation regions with the same phase position.
  • the excitation can be carried out with the same excitation process. If, in particular by use of rectangular excitation regions, substantially planar partial waves are excited, the oscillation mode to be damped can be substantially complete for them
  • the wavelength of the excited vibration modes are given at a given excitation frequency by the dispersion relation of the wall of the measuring tube or that wall section which guides the wave.
  • the described procedure can also be used for an excitation in more than two
  • Stimulation areas are used.
  • the spacing between their centers is half the wavelength or an odd multiple of half the wavelength of the one to be damped
  • the excitation curve can describe the time profile of the deformation of the wall or the forces exerted by the excitation.
  • the vibration elements are attached to the support structure such that the distance between the centers of two excitation regions is equal to the wavelength or an integer multiple of the wavelength of damping mode at the selected excitation frequency, wherein the control device is adapted to the excitation of the vibrating elements of these excitation regions with a phase shift of 180 ° between the
  • An opposite excitation curve can be realized, for example, by assigning a respective oscillating element to each of the excitation regions, wherein one of the oscillating elements is supplied with an excitation signal and the further oscillating element with the inverted excitation signal, or by connecting polarity of the oscillating elements or orientation of the oscillating elements with respect to the sidewall of the measuring tube is reversed for the different excitation areas.
  • This kind of suggestions can also be used by several users
  • Excitation regions are used, wherein the excitation regions are preferably linearly one behind the other and for successive excitation regions
  • an opposite excitation curve or a phase offset of 180 ° is used.
  • a choice of a different phase offset may be appropriate.
  • the distance of the excitation regions can initially be selected as desired, and the phase offset can then be selected such that a specific oscillation mode is used for this distance
  • the excitation frequency can be selected such that an excited further oscillation mode of the total wave has twice or half the wavelength of the oscillation mode to be damped.
  • the further vibration mode can be amplified by the superposition of the partial waves. If half the wavelength of the oscillation mode to be damped or an odd multiple thereof is selected as the distance between the centers of the excitation regions and the excitation is carried out in phase or with the same excitation curve, then another
  • Wavelength can be excited at the same excitation frequency can be determined from the dispersion relation of the side wall or the wall portion of the measuring tube, in which or in which the partial waves are excited.
  • the excitation frequency can be selected such that only those to be damped and the further or another oscillation mode are excited.
  • a corresponding frequency can be determined by means of the dispersion relation of the wall or of the wall section. Especially at relatively low
  • further measurement data can be detected, the excitation in two of the excitation regions for acquiring the measurement data with the same phase and the same excitation curve and for acquiring the further measurement data with a phase shift of 180 ° or opposite
  • Excitation course is done or vice versa. It is also possible that when using more than two excitation regions for parts of the excitation regions, a corresponding phase offset or a corresponding reversal of the excitation profile takes place.
  • An opposite excitation profile can be realized, for example, by using the wiring of electrodes of one used for an excitation region
  • Oscillating element is reversed or a drive signal is inverted.
  • the explained tuning of the distance between the centers of the excitation regions and the excitation frequency can be used additionally or alternatively to influence a propagation direction of the overall wave or to attenuate the propagation of the total wave in one direction.
  • Phase of the excitations are chosen so that a vibration mode of the partial waves in one direction is substantially extinguished and amplified in the other direction.
  • the oscillating elements may be fixed by the support structure such that the distance between the centers of two excitation regions is equal to one quarter of the wavelength or an odd multiple of one quarter of the wavelength of the oscillation mode to be damped at the selected excitation frequency, the controller being adapted to Excite the vibrating elements of these excitation regions with a phase shift of 90 ° between the excitation regions perform.
  • the excitation of a plane wave usually two plane waves are excited, which run in opposite directions of propagation. The overlay described above results in constructive interference for one of these propagation directions and destructive interference for the other. This will be shown below by an example in which the distance is one quarter of the wavelength of the vibration mode to be damped and a phase offset of + 90 ° is used.
  • the following guided wave is excited:
  • l is the wavelength
  • x is the distance from the excitation location
  • t is time
  • w is the product of 2p and the frequency of the guided wave. Due to the phase shift and the distance between the regions in the second region is excited by the following bidirectional guided wave:
  • the superimposition ie the sum of the two waves, can be calculated by trigonometric transformation, with the following result:
  • Propagation direction results in a constructive interference and destructive interference for the opposite direction of propagation.
  • Oscillating elements which are assigned to the individual mounting areas, optionally specify one of two possible propagation directions for the total wave.
  • the excitation frequency can be selected such that a first oscillation mode is at least partially extinguished by a destructive interference of the rapid waves in the propagation direction and a further oscillation mode in a direction of propagation opposite direction of propagation by a destructive interference of the Partial waves in the further propagation direction is at least partially extinguished.
  • the partial waves can overlap in such a way that the first
  • Vibration mode is amplified in the further propagation direction by a constructive interference and the further vibration mode is amplified in the propagation direction.
  • the first oscillation mode can be radiated essentially exclusively in the further propagation direction and the further oscillation mode essentially exclusively in the propagation direction.
  • different modes of vibration are radiated in different propagation directions.
  • a vibration mode with the wavelength lo directionally radiated it can, as explained above, the distance Dc a quarter of the wavelength or a
  • phase offset F can then be selected as follows:
  • the further oscillation mode must destructively interfere, ie have a phase offset of 180 ° or of p or an integral odd multiple thereof: where r is zero or an integer.
  • an excitation frequency can be selected for which this condition is fulfilled.
  • the excitation frequency is chosen so that exactly two oscillation modes can be excited by Lamb waves whose wavelengths have the ratio described.
  • p and / or m are each less than or equal to five or less than or equal to three.
  • Vibration mode can be achieved.
  • the control device For the vibrating elements can by the control device a common
  • Control signal are provided, as far as a phase-equal excitation or a more equal excitation course is desired.
  • a phase shift of 180 ° or a reversal of the excitation curve can be achieved, for example, by inverting a drive signal, a corresponding one
  • the oscillating element is arranged on the wall or a polarity of the connection of the oscillating element is interchanged with a control device.
  • Oscillating elements may be piezoelectric vibrating elements.
  • relatively simple electrode structures are used.
  • only two opposing electrodes may be provided, wherein one of these electrodes can also be guided in sections around the oscillating element for easier contacting and / or can protrude as a metal electrode from the vibrating element. It is also possible to guide both electrodes partially around the respective vibrating element in order to achieve a symmetrical structure.
  • a thickness vibration of the vibrating element is excited perpendicular to the wall of the measuring tube. The dimensions of the respective vibrating element can be selected such that the selected excitation frequency is a resonant frequency of the vibrating element,
  • a resonance frequency of a thickness vibration is.
  • the oscillating elements may extend substantially over the width of the measuring tube.
  • a line-like straight or curved arrangement of, for example, circular oscillating elements can be used in order to essentially excite a plane wave in the respective excitation region.
  • a plurality of the oscillating elements are provided both in a receiving side and in a transmitting side vibration converter, which are arranged spaced apart in a transverse direction of the measuring tube. This makes it possible, for example, to detect a signal propagation time and / or other measurement data for a plurality of sections of the volume flowed through in the transverse direction of the measuring tube and, for example, to average the signal propagation times or other measurement data and / or at least one fluid quantity determined by these to increase the measurement accuracy improve.
  • the expansion of the oscillating elements in the longitudinal direction of the tube or in the direction of the connecting straight line between the centers of the excitation regions can be, for example, equal to or less than half the wavelength of the oscillation mode to be damped.
  • the excitation signals can be provided by separate digital-to-analog converters or an analog phase shifter can be used to specify a phase offset.
  • an analog phase shifter can be used to specify a phase offset.
  • Phase offset may be adjustable, in particular, to values other than 0 °, 90 ° and 180 °. This may be expedient, since in this case, for example, an extinction or damping of certain vibration modes at arbitrary distances between the vibrating elements by specifying a selected accordingly
  • Phase offset can be realized. For example, production tolerances that can lead to a variation of the distance between the vibrating elements, be compensated by a choice of a suitable phase offset, for example in the context of a calibration of the measuring device.
  • the invention relates to a method for producing a measuring device according to the invention, which comprises the following steps:
  • the attachment of the oscillating elements to the support structure is preferably carried out before arranging the vibration transducer on the measuring tube.
  • further electrical components can also be used, in particular as a printed circuit board
  • trained support structure can be arranged, which can form part of the control device.
  • the attachment of the oscillating elements to the support structure can be done in particular by the electrical contacting, for example by soldering, gluing with conductive adhesive or bonding.
  • the vibration converter can
  • FIG. 1 shows an embodiment of a measuring device according to the invention
  • FIG. 2 shows a detailed view of a vibration converter of the one shown in FIG
  • Fig. 1 shows a measuring device 1 for determining a fluid and / or a
  • Fluid flow fluid size The fluid is in this case in a by the arrow. 7 shown direction through an interior 4 of a measuring tube 3 out.
  • Fluid size in particular a flow volume to determine, can by the
  • Control device 2 a transit time difference between the maturities of a first vibration transducer 5 to a second vibration transducer 6 and vice versa are determined. This exploits that this term of a
  • Velocity component of the fluid parallel to a propagation direction of an ultrasonic beam 8 depends on the fluid. From this transit time can thus be averaged over the path of the respective ultrasonic beam 8 flow velocity in the direction of the respective ultrasonic beam 8 and thus approximately an average
  • Flow rate can be determined in the traversed by the ultrasonic beam 8 volume.
  • Vibration converter 5 excited a guided wave in the side wall 9 of the measuring tube 3.
  • the excitation takes place with a frequency which is chosen such that a Lamb wave is excited in the side wall 9.
  • Such waves can be excited if the thickness 10 of the side wall 9 comparable to the wavelength of
  • the excited by the vibration transducer 5 in the side wall 9 guided wave is shown schematically by the arrow 11.
  • Compressional vibrations of the fluid are excited, which are radiated in the entire propagation path of the guided wave in the fluid. This is shown schematically by the ultrasound beams 8 offset from one another in the direction of flow.
  • the emitted ultrasonic beams 8 are reflected on the opposite side wall 12 and guided back to the side wall 9 via the fluid.
  • the incident ultrasonic beams 8 again excite a guided wave in the side wall 9, which is schematically represented by the arrow 13 and which passes through the vibration converter 6 can be recorded to determine the term.
  • the ultrasound beams 8 are not reflected on their path to the vibration converter 6, 15 or only once on the side walls 9, 12. It would of course be possible to use a longer measuring section, wherein the ultrasonic beams 8 are reflected several times on the side walls 9, 12.
  • Dispersion relation for Lamb waves in the side wall 9 has a plurality of branches. In an excitation with a given predetermined by the controller 2 frequency, it would thus be possible that different vibration modes are excited for the Lamb wave having different phase velocities. This causes the compression waves in response to this
  • Phase velocities are radiated at different Rayleigh angles 14. This results in different paths for the guidance of the ultrasonic wave from the vibration transducer 5 to the vibration transducer 6 and vice versa, which typically have different transit times. The received signals for these different propagation paths would thus have to be complicated
  • Vibration converter 5 a possible modest excitation of guided waves done.
  • a vibration transducer 5 which comprises a plurality of spaced apart on a support structure 16 arranged vibrating elements 17, 18. The side faces 19, 20 facing away from the support structure 16
  • Oscillating elements 17, 18 are for vibration coupling into the measuring tube.
  • the coupling can take place via an additional coupling element, for example a viscous coupling layer.
  • an excitation frequency can be used, in which the dispersion relation of the side wall 9 of the measuring tube 3 only two different modes with different
  • the damping of a vibration mode is for example possible if the distance 23 corresponds to an odd multiple of half the wavelength of this vibration mode at the selected excitation frequency and the excitation in the
  • Excitation regions 21, 22 is in phase and with the same excitation signal. In this case, the partial waves of this oscillation mode generated in the excitation regions 21, 22 cancel each other out. This result can also be achieved if the excitation in the excitation regions 21, 22 takes place with a phase shift of 180 ° or an inverted sign, the distance 23 being chosen such that it is an integer multiple of the wavelength to be attenuated at the selected excitation frequency Vibration mode corresponds.
  • a directional selectivity of the radiation can be achieved, for example, by using an excitation signal with a phase shift of 90 ° for the excitation regions 21, 22, the distance 23 between the centers 24, 25 of the excitation regions 21, 22 being one quarter of the wavelength of the oscillation mode to be damped at the selected excitation frequency.
  • the control device 2 If a phase offset or an inversion of the excitation signal for different oscillating elements 17, 18 is to be achieved, it is possible for the control device 2 to provide a plurality of separate excitation signals. However, particularly preferably, a common excitation signal is provided for all oscillating elements 17, 18 and the signal conditioning for providing the phase offset or for inversion takes place by means of components 26 which are part of the oscillation converter 5 and are also arranged on the support structure 16. In this case, it is possible for the vibration transducers 17, 18 to have a fixed polarity or a fixed one
  • Phase offset is specified. However, it is particularly preferred for at least one of the vibration transducers 17, 18 a polarity with which this is operated,
  • phase offset can also be multi-level or freely selectable. This can be achieved, for example, by switching the electrode contacting through one of the components 26 or a switchable one
  • FIG. 2 A detailed view of the vibration converter 5 is shown in FIG. 2.
  • Vibration converter 5 is formed by the T rag Vietnamese 16, the vibrating elements 17, 18 and the components 26.
  • the support structure 16 serves on the one hand for mechanical support of the vibration elements 17, 18 and the components 26 and on the other hand for electrical contacting of these elements.
  • a circuit board is used as a support structure 16. This consists of a base body 27, which is formed for example of hard paper, and supported by this conductor tracks 28, 29, for example, printed on the base body 27 or worked out by an etching process of a closed metal layer on the base body 27.
  • the electrical contact between the electrodes 30, 31, which together with a piezoelectric element 34 form the oscillating elements 17, 18, and the conductor track 28 on the side of the printed circuit board facing the measuring tube is produced by contact means 32, 33, for example by soldering, by gluing with electrically conductive adhesive or by bonding.
  • the contact means 32, 33 are not used exclusively for electrical contacting of the vibrating elements 17, 18, but they support the
  • Vibration transducer to the circuit board or the support means 16 are arranged.
  • the vibration transducer 5 provided in this way can then be arranged on the measuring tube in such a way that the side faces of the vibration transducer 17, 18 facing away from the printed circuit board in the respective
  • Excitation range 21, 22 of the measuring tube 3 contact the measuring tube directly or via a coupling element, not shown.
  • the distance 23 between the centers 24, 25 of the excitation regions is in this case already specified in the attachment of the oscillating elements 17, 18 to the circuit board and thus in the context of the assembly of the circuit board. This distance can thus be specified with high accuracy and adhered to due to the preferably automated assembly of the circuit board with little technical objection and high accuracy.

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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 dispositif de mesure pour déterminer une dimension d'un fluide relative à un fluide et/ou à un écoulement de fluide, présentant un dispositif de commande (2), un tube de mesure (3) recevant le fluide et/ou à travers lequel le fluide peut s'écouler et un premier transducteur de vibrations (5) agencé au niveau du tube de mesure (3), le premier transducteur de vibrations (5) comprenant plusieurs éléments vibrants (17, 18) fixés à une certaine distance les uns des autres sur une structure support (16) du premier transducteur de vibrations (5), les surfaces latérales (19, 20) opposées à la structure support (16) des éléments vibrants (17, 18) étant accouplées, pour le couplage en vibration dans le tube de mesure (3), directement ou via un élément d'accouplement à une zone d'excitation respective (21, 22) du tube de mesure (3), les éléments vibrants (17, 18) pouvant être commandés par le dispositif de commande (2) pour exciter ensemble une onde guidée dans une paroi latérale (9) du tube de mesure (3), l'onde guidée pouvant être guidée directement dans la paroi latérale (9) ou indirectement via le fluide vers un deuxième transducteur de vibrations (6) agencé au niveau du tube de mesure (3) ou en retour vers le premier transducteur de vibrations (5) et pouvant y être détectée par le dispositif de commande (2) pour la détermination de données de mesure, la dimension du fluide pouvant être déterminée par le dispositif de commande (2) en fonction des données de mesure.
PCT/EP2019/060588 2018-05-09 2019-04-25 Dispositif de mesure pour la détermination d'une dimension d'un fluide WO2019214955A1 (fr)

Applications Claiming Priority (2)

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DE102018003803.4A DE102018003803A1 (de) 2018-05-09 2018-05-09 Messeinrichtung zur Ermittlung einer Fluidgröße
DE102018003803.4 2018-05-09

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EP0264991A1 (fr) * 1986-09-29 1988-04-27 Altometer Produktiebedrijf Débitmètre ultrasonore
US20090016555A1 (en) * 2007-07-11 2009-01-15 Lynnworth Lawrence C Steerable acoustic waveguide
US20160305805A1 (en) * 2015-04-14 2016-10-20 Joseph Baumoel Phase controlled variable angle ultrasonic flow meter

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DE102013008570B4 (de) * 2013-05-17 2015-06-25 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren für den Betrieb eines elektromagnetischen Ultraschallwandlers
CN103995059A (zh) * 2014-05-30 2014-08-20 北京理工大学 一种适用于曲面检测的声表面波柔性梳状换能器

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Publication number Priority date Publication date Assignee Title
US3401360A (en) * 1963-07-19 1968-09-10 Bell Telephone Labor Inc Phased transducer arrays for elastic wave transmission
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