WO2023247152A1 - Multicapteur vibronique modulaire - Google Patents

Multicapteur vibronique modulaire Download PDF

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Publication number
WO2023247152A1
WO2023247152A1 PCT/EP2023/064686 EP2023064686W WO2023247152A1 WO 2023247152 A1 WO2023247152 A1 WO 2023247152A1 EP 2023064686 W EP2023064686 W EP 2023064686W WO 2023247152 A1 WO2023247152 A1 WO 2023247152A1
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WO
WIPO (PCT)
Prior art keywords
oscillating
sensor
modular
piezoelectric
vibronic
Prior art date
Application number
PCT/EP2023/064686
Other languages
German (de)
English (en)
Inventor
Mohammad Sadegh Ebrahimi
Sergey Lopatin
Harald Bauer
Laura MIGNANELLI
Tobias Brengartner
Original Assignee
Endress+Hauser SE+Co. KG
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+Hauser SE+Co. KG filed Critical Endress+Hauser SE+Co. KG
Publication of WO2023247152A1 publication Critical patent/WO2023247152A1/fr

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Classifications

    • 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
    • G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves
    • G01F23/2967—Acoustic waves making use of acoustical resonance or standing waves for discrete levels

Definitions

  • the invention relates to a modular vibronic sensor for determining and/or monitoring at least one process variable of a medium.
  • the present invention further relates to a measuring cell comprising a sensor according to the invention, a portable measuring device for analyzing a medium with a measuring cell according to the invention and a method for operating a sensor according to the invention.
  • the medium is located, for example, in a container, for example in a container or in a pipeline, or in the measuring cell.
  • Vibronic sensors are often used in process and/or automation technology.
  • level measuring devices they have at least one mechanically oscillatable unit, such as a tuning fork, a single rod or a membrane.
  • a drive/receiving unit often in the form of an electromechanical converter unit, which in turn can be, for example, a piezoelectric drive or an electromagnetic drive.
  • the applicant produces a wide variety of corresponding field devices and sells them, for example, under the names LIQUIPHANT or SOLIPHANT.
  • the underlying measurement principles are in principle known from a large number of publications.
  • the drive/receiving unit stimulates the mechanically oscillatable unit to mechanical oscillations by means of an electrical excitation signal.
  • the drive/Z receiving unit can receive the mechanical vibrations of the mechanically oscillatable unit and convert them into an electrical reception signal.
  • the drive/receiver unit is accordingly either a separate drive unit and a separate receiver unit or a combined drive/receiver unit.
  • the drive/receiver unit is part of a feedback electrical oscillating circuit, by means of which the mechanically oscillatable unit is excited to produce mechanical oscillations.
  • the resonant circuit condition according to which the amplification factor is >1 and all phases occurring in the resonant circuit result in a multiple of 360°, must be fulfilled.
  • a certain phase shift between the excitation signal and the received signal must be guaranteed. Therefore, a predeterminable value for the phase shift, i.e. a setpoint for the phase shift between the excitation signal and the received signal, is often set.
  • Both the excitation signal and the received signal are characterized by their frequency w, amplitude A and/or phase ⁇ t>. Accordingly, changes in these variables are usually used to determine the respective process variable.
  • the process variable can be, for example, a fill level, a predetermined fill level, or the density or viscosity of the medium, as well as the flow.
  • a vibronic level switch for liquids for example, a distinction is made as to whether the oscillatable unit is covered by the liquid or vibrates freely. These two states, the free state and the covered state, are distinguished, for example, based on different resonance frequencies, i.e. based on a frequency shift.
  • the density and/or viscosity can only be determined with such a measuring device if the oscillatable unit is completely covered by the medium.
  • various options have also become known from the prior art, such as those in the documents DE10050299A1, DE102007043811A1, DE10057974A1, DE102006033819A1, DE102015102834A1 or DE1020161127 43A1 disclosed.
  • various vibronic multisensors have become known with which other process variables can be determined.
  • such sensors have been disclosed in which the ultrasonic measuring principle is used in addition to the vibronic measuring principle, such as the sensors from DE102018127526A1, DE102019116150A1, DE102019116151A1, DE102019116152, DE102019110821A1, DE102020105 214A1, DE102020116278A1, or the previously unpublished German patent application with the File number 102021122534.5.
  • the present invention is based on the object of further increasing the functionality of a vibronic sensor.
  • the sensor according to the invention is a modular, vibronic sensor for determining and/or monitoring at least one process variable of a medium with a sensor unit.
  • the sensor unit comprises a, in particular electrically insulating, first base body and a first oscillating element, which has a first and second piezoelectric element, and a second oscillating element, which has a third and fourth piezoelectric element.
  • the first and second oscillating elements are each fastened in a first end region on or in the first base body.
  • the first and second and the third and fourth piezoelectric elements are each fastened to one another via a connecting surface, in particular glued to one another.
  • the connecting surfaces of the first and second or third and fourth piezoelectric elements each have the same polarization. So there are equally polarized surfaces facing each other in relation to the first and second or third and fourth piezoelectric elements.
  • the two oscillating elements form a mechanically oscillatable unit, for example in the form of a tuning fork.
  • the first and second and the third and fourth piezoelectric elements each form a drive/receiving unit for generating mechanical oscillations of the oscillating elements by means of a suitable excitation signal.
  • the mechanical vibrations are influenced by the properties of the medium, so that a statement about the at least one process variable can be generated based on at least one reception signal received by the oscillating elements, which represents the oscillations of the oscillating elements is.
  • the piezoelectric elements can also serve to generate a transmission signal, which is received in the form of a response signal. If the transmission signal passes through the medium at least temporarily and in sections on its path, it is also influenced by the physical and/or chemical properties of the medium and can accordingly be used to determine a process variable of the medium. It is therefore also possible to implement at least two measuring principles in a single device, namely the vibronic measuring principle and the ultrasonic measuring principle. In particular, this also allows the simultaneous determination and/or monitoring of several, in particular different, process variables.
  • the received signal and the response signal can advantageously be evaluated independently of one another and the number of process variables that can be determined can be significantly increased, which results in a higher functionality of the respective sensor or in an expanded area of application.
  • the modular sensor concept according to the invention enables particularly easy adaptability to different geometries.
  • the dimensions of the oscillating elements and the base body can be selected adaptively. In principle, differently designed oscillating elements can be used with the same base body.
  • the freedom of design not only affects the dimensions and choice of geometry, but also the materials used. This particularly advantageously allows miniaturization of corresponding vibronic sensors.
  • a sensor according to the invention can be produced particularly easily and inexpensively. For example, it is not necessary to manufacture a separate drive/receiver unit. Rather, the production of oscillating elements and the drive/receiving unit takes place together in one step.
  • the base body can have a partial area for accommodating electronics, so that a simplification of the sensor structure can also be achieved in this context.
  • each of the piezoelectric elements is an elongated, flat body, in particular a body with a substantially rectangular cross-sectional area. But other shapes for the cross-sectional area are also conceivable and fall within the scope of the present invention. In some embodiments, corners of the piezoelectric elements can also be rounded.
  • each piezoelectric element of each oscillating element is individually electrically contacted.
  • the piezoelectric elements are each electrically contacted via a contact surface, which contact surface is arranged opposite the respective connection surface.
  • the piezoelectric elements that are fastened to one another are therefore each electrically contacted on sides facing away from one another.
  • the piezoelectric elements are electrically contacted in the first end region, i.e. in the region in which the oscillating elements are attached to or in the base body. It is also advantageous if the two oscillating elements are arranged along an imaginary line through a center of a cross-sectional area of the base body and at the same distance from the center and are aligned parallel to one another. The contact surfaces of the first and second oscillating elements are advantageously aligned parallel to one another. In this way, mechanical vibration decoupling is achieved.
  • the oscillating elements are at least partially provided with a coating.
  • the oscillating elements are advantageously provided with the coating at least in an area in contact with the media.
  • a wide variety of coating materials can be used. For example, it can be an insulating coating. But it can also be a water-absorbing coating.
  • the senor according to the invention comprises a second base body, in particular an electrically insulating one, wherein the first and second oscillating elements are each fastened in a second end region on or in the second base body.
  • the two oscillating elements are therefore attached in both end regions.
  • each oscillating element there is a first electrical contact in the first end region and by means of the two contact surfaces and a second electrical contact in the second end region and in the region of the connecting surfaces facing each other of the respective two piezoelectric elements.
  • Such a contacting concept is advantageous for use with conductive media without additional measures.
  • the senor according to the invention comprises a filter element which is designed and/or arranged in such a way that it at least partially surrounds the two oscillating elements.
  • the filter element comprises, for example, a, preferably porous, membrane or a selective membrane.
  • Filter element can be fastened in particular in the area of at least the first and/or second base body.
  • a measuring cell for analyzing a medium comprising a modular vibronic sensor according to the invention.
  • a measuring cell is in principle understood to mean a closed volume with a, for example, universal connection for connecting a sensor.
  • the modular vibronic sensor according to the invention can be introduced into the measuring cell, for example, by means of the first base body.
  • the base body can be provided with a connecting element that is complementary to the connecting element of the measuring cell.
  • the object on which the invention is based is also achieved by a portable measuring device for analyzing a medium, comprising a measuring cell according to the invention, electronics and a device for sampling.
  • the electronics can, for example, have a display unit.
  • the portable measuring device is used, for example, to determine and/or monitor a process variable of a medium such as, but not exclusively, the density, viscosity or speed of sound of a medium or a concentration of a substance contained in the medium.
  • the object on which the invention is based is achieved by a method for operating a modular vibronic sensor according to the invention for determining and/or monitoring at least a first process variable of a medium, the sensor unit being excited to mechanical vibrations by means of an excitation signal, the mechanical vibrations of the sensor unit are received and converted into a received signal, and the at least one first process variable is determined based on the received signal.
  • the process variable is, for example, the fill level, the density or the viscosity of the medium.
  • the sensor unit includes the first and second oscillating elements.
  • the excitation signal is, for example, an electrical signal with at least one predeterminable frequency, in particular a sinusoidal or a rectangular signal.
  • the sensor unit is stimulated to resonate at least temporarily.
  • the mechanical vibrations are influenced by the medium surrounding the vibrating rods, so that conclusions can be drawn about various properties of the medium based on a received signal representing the vibrations.
  • the transmission signal is preferably an ultrasonic signal, in particular a pulsed one, in particular at least one ultrasonic pulse.
  • the second measurement method used in the context of the present invention is therefore an ultrasound-based measurement.
  • the transmission signal emitted at least partially passes through the medium and its properties are influenced by it. Accordingly, conclusions about different media can also be drawn based on the response signal received.
  • Element of the first oscillating element and the fourth piezoelectric element of the second Oscillating element is supplied with the excitation signal, and when the received signal is received by the second piezoelectric element of the first oscillating element and the third piezoelectric element of the second oscillating element.
  • piezoelectric elements of each oscillating element that face and face away from one another are controlled together. This results in anti-phase oscillations of the sensor unit.
  • the first piezoelectric element of the first oscillating element and the third piezoelectric element of the second oscillating element are subjected to the excitation signal, the received signal being received by the second piezoelectric element of the first oscillating element and the fourth piezoelectric element of the second oscillating element.
  • the second basic mode of the sensor unit can be excited, in which the first and second oscillating elements carry out parallel oscillations.
  • Excitation of the sensor unit in different modes is particularly advantageous in the event that additional condition monitoring, preferably predictive maintenance, is to be carried out using the method according to the invention.
  • the different vibration modes can be excited alternately. However, it is also conceivable to only activate the additional mode when necessary.
  • At least a second process variable of the medium is determined or monitored.
  • a transmission signal is sent out and a response signal is received, with the at least one second process variable being determined based on the response signal.
  • the second process variable is, for example, the speed of sound of the medium.
  • the first oscillating element is acted upon by the transmission signal, with the response signal being received by the second oscillating element.
  • the at least one first and second process variable are determined alternately.
  • the sensor unit it is also possible for the sensor unit to be acted upon simultaneously by means of the excitation signal and by means of the transmission signal, with the excitation signal and the transmission signal being superimposed on one another.
  • the process variables that can be determined according to the invention are, for example, given by a predeterminable fill level, the density, the viscosity, the speed of sound or one of at least size derived from one of these sizes.
  • concentration(s) of one or two different substances in the medium can also be determined.
  • the density and/or viscosity of the medium is determined based on the received signal and the speed of sound within the medium is determined based on the response signal.
  • other process variables and/or parameters that are accessible by means of the two measurements carried out can also be determined and used to characterize the respective medium.
  • a sensor according to the invention, a measuring cell, a portable measuring device and the method can be used, for example, to monitor a fermentation process.
  • sugar is converted into ethanol.
  • it is therefore necessary to determine both the concentration of sugar and ethanol.
  • the senor according to the invention can also advantageously be used as a single-use sensor.
  • the sensor can be specifically adapted to the respective task.
  • Use in a laboratory is also advantageous, in particular for determining the respective process variable based on a comparatively small volume of liquid or a small sample quantity.
  • Another advantageous use relates to the validation of sensors, due to the simple and inexpensive manufacturability of the sensor according to the invention.
  • an advantageous use relates to the use of a sensor according to the invention as a gas sensor for determining and/or monitoring a gaseous medium.
  • a resonance frequency of a sensor according to the invention can be individually adapted to the respective application.
  • FIG. 2 shows a first possible embodiment of a modular vibronic sensor with a base body
  • 3 shows a second possible embodiment of a modular vibronic sensor with a first and a second base body
  • Fig. 7 shows a portable measuring device.
  • a vibronic sensor 1 with a sensor unit 2 is shown in FIG.
  • the sensor has a mechanically oscillatable unit 4 in the form of a tuning fork, which is partially immersed in a medium M which is located in a container 3.
  • the oscillatable unit 4 is excited to mechanical vibrations by means of the excitation/reception unit 5, and can be, for example, by a piezoelectric stack or bimorph drive.
  • Other vibronic sensors have, for example, electromagnetic drive receiving units 5. It is possible to use a single drive receiving unit 5, which is used to excite the mechanical vibrations and to detect them. However, it is also conceivable to implement a drive unit and a receiving unit. 1 also shows an electronic unit 6, by means of which the signal is detected, evaluated and fed.
  • FIG. 2 A first exemplary embodiment of a modular vibronic sensor 1 according to the invention is sketched in FIG. 2.
  • the sensor 1 has a sensor unit 2 comprising a, in particular insulating, first base body 7, a first oscillating element 8, which has at least a first 9a and a second 9b piezoelectric element, and a second oscillating element 10, which has at least a third 11a and fourth 11 b has piezoelectric element.
  • the two oscillating elements 8, 10 are fastened in a first end region Ei in the base body 7 and the first 9a and second 9b or the third 11a and fourth 11b are piezoelectric elements of the first 8 and second oscillating element 10, respectively, by means of a connecting surface V attached to each other.
  • the geometric shape of the piezoelectric elements 9a, 9b, 11a, 11 b each preferably have an elongated cross-sectional area. They can be modeled on conventional oscillating rods of a vibronic sensor.
  • each piezoelectric element 9a, 9b, 11a, 11b is contacted individually by means of a connecting line 12a-12d via the connecting surfaces V to contact surfaces K lying opposite each other. All contacts are thus arranged in the first end region Ei.
  • a further advantageous embodiment for a sensor according to the invention is the subject of FIG are.
  • FIG. 4 shows a further preferred option for contacting the piezoelectric elements 9a, 9b, 11a, 11b.
  • the piezoelectric elements 9a, 9b of each oscillating element 8, 10 are electrical via the connecting surfaces V by means of a second connecting line 14b and via the two contact surfaces K by means of a first connecting line 14a contacted, i.e. in both end areas Ei and E 2 .
  • Such contact is particularly advantageous for using the sensor 1 with conductive media M.
  • FIG. 6 shows a measuring cell 15 according to the invention with a sensor 1 according to the invention similar to that from FIG. 2.
  • the base body 7 is also used to accommodate the electronics 6.
  • Such an embodiment of a sensor 1 according to the invention is particularly compact and the necessary manufacturing steps are further reduced.
  • a portable measuring device 16 according to the invention is finally sketched in FIG.
  • the measuring device 16 comprises a housing 17 with an optional handle 17a and a device for sampling 18, a measuring cell 15 according to the invention with a sensor 1 according to the invention, not shown here, and electronics 19 with an optional display unit.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un capteur vibronique modulaire (1) conçu pour déterminer et/ou surveiller au moins une grandeur de processus d'un milieu (M) au moyen d'un ensemble capteur (2), cet ensemble capteur (2) comprenant un premier corps de base (7) en particulier électro-isolant, un premier élément oscillant (8) comportant un premier (9a) et un deuxième (9b) élément piézoélectrique et un deuxième élément oscillant (10) comportant un troisième (11a) et un quatrième (11b) élément piézoélectrique. Selon l'invention, le premier (8) et le deuxième (10) élément oscillant sont fixés respectivement dans une première zone d'extrémité (E1) sur ou dans le premier corps de base (7), le premier (9a) et le deuxième (9b) ou le troisième (11a) et le quatrième (11b) élément piézoélectrique du premier (8) ou du deuxième (10) élément oscillant étant respectivement fixés l'un à l'autre par l'intermédiaire d'une surface de liaison (V), les surfaces de liaison (V) du premier (9a) et du deuxième (9b) ou du troisième (11a) et du quatrième (11b) élément piézoélectrique présentant respectivement la même polarisation. Cette invention concerne en outre une cellule de mesure (15) comportant un capteur (1) selon l'invention, un appareil de mesure (16) portatif comportant une cellule de mesure (15) selon l'invention et un procédé pour faire fonctionner un capteur (1) selon l'invention.
PCT/EP2023/064686 2022-06-22 2023-06-01 Multicapteur vibronique modulaire WO2023247152A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022115591.9 2022-06-22
DE102022115591.9A DE102022115591A1 (de) 2022-06-22 2022-06-22 Modularer vibronischer Multisensor

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WO2023247152A1 true WO2023247152A1 (fr) 2023-12-28

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US20200340896A1 (en) * 2017-12-19 2020-10-29 Endress+Hauser SE+Co. KG Vibronic sensor
DE102018127526A1 (de) 2018-11-05 2020-05-07 Endress+Hauser SE+Co. KG Vibronischer Multisensor
US20210364347A1 (en) * 2018-11-05 2021-11-25 Endress+Hauser SE+Co. KG Vibronic multisensor
DE102019110821A1 (de) 2019-04-26 2020-10-29 Endress+Hauser SE+Co. KG Vibronischer Multisensor
DE102019116152A1 (de) 2019-06-13 2020-12-17 Endress+Hauser SE+Co. KG Vibronischer Multisensor
DE102019116150A1 (de) 2019-06-13 2020-12-17 Endress+Hauser SE+Co. KG Vibronischer Multisensor
DE102019116151A1 (de) 2019-06-13 2020-12-17 Endress+Hauser SE+Co. KG Vibronischer Multisensor
DE102020105214A1 (de) 2020-02-27 2021-09-02 Endress+Hauser SE+Co. KG Vibronischer Multisensor
DE102020116278A1 (de) 2020-06-19 2021-12-23 Endress+Hauser SE+Co. KG Vibronischer Multisensor

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