WO2023247156A1 - Multicapteur vibronique modulaire - Google Patents

Multicapteur vibronique modulaire Download PDF

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Publication number
WO2023247156A1
WO2023247156A1 PCT/EP2023/064772 EP2023064772W WO2023247156A1 WO 2023247156 A1 WO2023247156 A1 WO 2023247156A1 EP 2023064772 W EP2023064772 W EP 2023064772W WO 2023247156 A1 WO2023247156 A1 WO 2023247156A1
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WO
WIPO (PCT)
Prior art keywords
sensor
modular
medium
vibronic
base body
Prior art date
Application number
PCT/EP2023/064772
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 WO2023247156A1 publication Critical patent/WO2023247156A1/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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
    • G01N11/16—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring damping effect upon oscillatory body
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
    • G01N2009/006—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis vibrating tube, tuning fork

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.
  • they have at least one mechanically oscillatable unit, such as a tuning fork, a single rod or a membrane.
  • a drive/receiver 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 drive/receiver unit stimulates the mechanically oscillatable unit to mechanical oscillations by means of an electrical excitation signal. Conversely, the drive/receiver 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 oscillating circuit condition according to which the Amplification factor >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.
  • a vibronic sensor With a vibronic sensor, several process variables can be determined and used to characterize the respective process. In many cases, however, further information about the process, in particular knowledge of other physical and/or chemical process variables and/or parameters, is required for comprehensive process monitoring and/or control. This can be achieved, for example, by integrating additional field devices into the respective process. The measured values provided by the various measuring devices can then be appropriately processed further in a unit that is higher-level to the devices.
  • various vibronic multi-sensors have become known with which other process variables can be determined.
  • such sensors have been disclosed in which, in addition to the vibronic measuring principle, the ultrasonic measuring principle is used, 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 tubular base body, a first piezoelectric element and a second piezoelectric element.
  • the first and second piezoelectric elements are arranged opposite one another in the region of a lateral surface of the base body.
  • the base body and the two piezoelectric elements together form a mechanically oscillatable unit with a drive/receiver unit.
  • the sensor unit is excited to mechanical vibrations using 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 sensor unit, which represents the vibrations of the sensor unit 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.
  • the vibronic measuring principle and the ultrasonic measuring principle.
  • 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 dimensioning 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, no production of a separate drive/receiver unit is necessary. Rather, the production of oscillating elements and the drive/receiver 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.
  • the piezoelectric elements are attached to the tubular base body from the outside or from the inside, or are arranged within a wall of the tubular body.
  • the tubular body is closed in a first and/or second end region.
  • a gaseous or other medium can be arranged in an internal volume of the tubular body.
  • the piezoelectric elements and/or an outer wall of the base body is/are at least partially provided with a coating.
  • at least one area of the sensor unit that comes into contact with the media is provided with the coating.
  • 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 filter element which is designed and/or arranged in such a way that it at least partially surrounds the tubular base body.
  • the filter element is preferably attached to the base body.
  • the filter element comprises, for example, a, preferably porous, membrane or a selective membrane.
  • the Filter element can be fastened in particular in the area of at least the first 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.
  • 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 a variable derived from at least one of these variables.
  • the concentration(s) of one or two different substances in the medium can also be determined. Particularly preferably, 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 advantageously possible, 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. It should be noted that the configurations described in connection with the sensor according to the invention can also be applied mutatis mutandis to the measuring cell according to the invention, the portable measuring device according to the invention and the method according to the invention and vice versa.
  • FIG. 2 shows a first embodiment of a modular vibronic sensor
  • Fig. 3 shows a measuring cell according to the invention
  • Fig. 4 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/receiver units 5. It is possible to use a single drive/receiver unit 5, which serves to excite the mechanical vibrations and to detect them. However, it is also conceivable to implement a drive unit and a receiving unit. Also shown in FIG.
  • 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 electrically insulating, first tubular base body 7 and a first 8a and a second 8b piezoelectric element.
  • the two piezoelectric elements 8a, 8b are arranged opposite one another in the area of a lateral surface m of the base body 7.
  • the piezoelectric elements 8a, 8b are applied to the lateral surface m in the inner region of the tubular base body 7.
  • the piezoelectric elements 8a, 8b can also be applied to the lateral surface m directed outwards.
  • the piezoelectric elements 8a, 8b can therefore be arranged on the tubular body 7 from the outside or from the inside. They can also be at least partially incorporated into the lateral surface m.
  • the base body 7 can also be open in its two end regions Ei and E2, as in the case of FIG. 2. Likewise, the base body 7 can also be closed in one or both end regions Ei and E2. Furthermore, in the case of FIG. 2, a cross-sectional area of the base body 7 is designed to be square. However, numerous other shapes can also be selected for the cross-sectional area and are also covered by the present invention.
  • FIG. 3 shows a measuring cell 10 according to the invention with a sensor 1 according to the invention similar to that from FIG. 2.
  • the two piezoelectric elements 8a, 8b are electrically contacted via the connecting lines 9a, 9b.
  • Electronics 6 are arranged in the second end region E2 within the base body 7.
  • the measuring device 11 comprises a housing 12 with an optional handle 12a and a device for sampling 13, a measuring cell 10 according to the invention with a, here sensor 1 according to the invention, not shown, and electronics 14 with an optional display unit.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un capteur (1) vibronique modulaire conçu pour déterminer et/ou surveiller au moins une grandeur de traitement d'un milieu (M) au moyen d'un ensemble capteur (2), cet ensemble capteur (2) comprenant un premier corps de base (7) tubulaire, notamment électro-isolant, un premier élément piézoélectrique (8a) et un deuxième élément piézoélectrique (8b), le premier (8a) et le deuxième (8b) élément piézoélectrique étant disposés l'un en face de l'autre dans la zone d'une surface latérale (m) du corps de base (7). Cette invention concerne en outre une cellule de mesure (10) comprenant un capteur (1) selon l'invention, un appareil de mesure (11) portable comprenant une cellule de mesure (10) selon l'invention et un procédé pour faire fonctionner un capteur vibronique modulaire (1) selon l'invention.
PCT/EP2023/064772 2022-06-22 2023-06-02 Multicapteur vibronique modulaire WO2023247156A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022115594.3A DE102022115594A1 (de) 2022-06-22 2022-06-22 Modularer vibronischer Multisensor
DE102022115594.3 2022-06-22

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WO2023247156A1 true WO2023247156A1 (fr) 2023-12-28

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WO (1) WO2023247156A1 (fr)

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DE102018127526A1 (de) 2018-11-05 2020-05-07 Endress+Hauser SE+Co. KG Vibronischer Multisensor
DE102019110821A1 (de) 2019-04-26 2020-10-29 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
WO2020249317A1 (fr) * 2019-06-13 2020-12-17 Endress+Hauser SE+Co. KG Multicapteur vibronique
DE102019116152A1 (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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