WO2025002812A1 - Dispositif radar de mesure de niveau de remplissage pour détecter des niveaux de remplissage dans des récipients - Google Patents

Dispositif radar de mesure de niveau de remplissage pour détecter des niveaux de remplissage dans des récipients Download PDF

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Publication number
WO2025002812A1
WO2025002812A1 PCT/EP2024/066225 EP2024066225W WO2025002812A1 WO 2025002812 A1 WO2025002812 A1 WO 2025002812A1 EP 2024066225 W EP2024066225 W EP 2024066225W WO 2025002812 A1 WO2025002812 A1 WO 2025002812A1
Authority
WO
WIPO (PCT)
Prior art keywords
radar
waveguide
measuring device
level measuring
dielectric
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.)
Ceased
Application number
PCT/EP2024/066225
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German (de)
English (en)
Inventor
Christian WEINZIERLE
Steffen WÄLDE
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.)
Vega Grieshaber KG
Original Assignee
Vega Grieshaber 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 Vega Grieshaber KG filed Critical Vega Grieshaber KG
Priority to EP24732672.1A priority Critical patent/EP4735841A1/fr
Priority to CN202480042959.3A priority patent/CN121399436A/zh
Publication of WO2025002812A1 publication Critical patent/WO2025002812A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G01F23/284—Electromagnetic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement

Definitions

  • Radar level measuring device for detecting fill levels in containers
  • the present invention relates to a radar level measuring device for detecting fill levels in containers and a system for detecting fill levels.
  • Radar level measuring devices are generally known in the state of the art and are used, for example, in the process and chemical industries to monitor fill levels in containers.
  • a radar level measuring device for detecting levels in containers, comprising: a primary radiator for transmitting and receiving radar beams; a dielectric lens for transmitting and receiving the radar beams; a waveguide unit for guiding the radar beams between the primary radiator and the dielectric lens; wherein the dielectric lens and the waveguide unit are arranged at a distance from one another.
  • the term primary radiator is to be understood broadly in this case and means a structural element that is designed to emit electromagnetic waves, preferably radar beams, that are generated by a circuit, preferably a high-frequency circuit in the GHz range, and/or to receive reflected radar beams.
  • the primary radiator can be designed in one or more parts.
  • the primary radiator can be arranged at least partially on the high-frequency circuit for generating the radar beams and for processing reflected radar beams.
  • the term dielectric lens is to be understood broadly here and preferably means a lens made of a dielectric material that is curved on both sides and receives radar beams emitted directly or indirectly by the primary emitter and transmits them in a directed manner, or receives reflected radar beams and transmits them directly or indirectly to the primary emitter.
  • the dielectric lens can influence the shape or direction of the radiation.
  • the dielectric lens preferably has a spherical shape. Depending on a radius or a curvature, a distance results in which the radiation emitted or sent by the dielectric lens is bundled.
  • the dielectric lens preferably comprises a loss-free dielectric material.
  • the term waveguide unit is to be understood broadly here and means a device that is designed to guide electromagnetic waves, preferably radar beams.
  • the waveguide unit can be one-piece or multi-piece.
  • the waveguide unit can be designed as a waveguide (e.g. metallic waveguide).
  • the waveguide unit can be designed as a dielectric waveguide.
  • spaced is to be understood broadly in this case and means that the waveguide unit and the dielectric lens are arranged in such a way that a spatial distance or a free space exists between one end of the waveguide unit, which faces the dielectric lens and the dielectric lens.
  • the length of this distance preferably depends on the geometry of the dielectric lens.
  • the free space is preferably filled with air.
  • radar level measuring device is to be understood broadly here and preferably means a measuring device for detecting fill levels in containers, whereby the measuring device determines the fill level according to the principle of measuring the time of flight of the radar beams.
  • a fill level to be measured in the container is determined taking into account the position of the level measuring device and the measured time of flight between transmitted radar beams and received radar beams, i.e. radar beams reflected from the surface of, for example, a bulk material in a container.
  • Different methods can be used to determine the time of flight, e.g. pulse radar or frequency modulation continuous-action radar.
  • the invention is based on the knowledge that the sensor electronics of the radar level measuring device must not exceed a temperature of approx. 85 °C, whereas the process temperature in the containers in which the level is measured can be up to 450 °C. This leads to the need for thermal decoupling of the sensor electronics and radar antenna.
  • radar level measuring devices that operate in the range above 100 GHz are currently being used more and more.
  • the thermal decoupling in the range of radar level measuring devices that operate in the range below 100 GHz is usually achieved by so-called waveguides.
  • the waveguides are usually made of metal and have a bore diameter of 2.5 mm to 3.0 mm for radar level measuring devices in the operating range of 80 GHz.
  • the waveguides are used to transmit the radar beams from the primary radiator to the antenna.
  • the thermal decoupling is provided by the length of the waveguide.
  • the permissible bore diameter of the waveguides decreases.
  • a bore diameter of 0.87 mm is required.
  • the waveguide can only be manufactured using special erosion processes, which are uneconomical.
  • the problem of thermal decoupling is solved by using a dielectric lens as an antenna and spacing the dielectric lens from the waveguide unit. This makes it possible, for example, to continue to use metallic waveguides as a waveguide unit, since they do not have to reach up to the antenna, which is designed here as a dielectric lens.
  • the length of the metallic waveguide can therefore be be lower even at high frequencies. Furthermore, there is air between the end of the waveguide unit and the dielectric lens, which also functions as an insulator. Thermal decoupling is thus achieved by the arrangement according to the invention. This can have an advantageous effect on the accuracy of the measurement and the robustness of the radar level measuring device. Furthermore, the use of a dielectric waveguide, which is preferably made of plastic, as a component of the waveguide unit can also advantageously enable galvanic decoupling or potential separation between the sensor electronics and the container or container potential.
  • Modern radar level measuring devices for the process industry and automation technology are now gradually opening up the frequency range above 100 GHz. Due to the emergence of new frequency regulations, ever better semiconductor processes and more precise manufacturing methods, radar-based level measuring devices can be developed, produced and marketed up to 250 GHz. Higher frequency ranges have the advantage that a narrower opening angle can be achieved with the same antenna size.
  • the agitators or heating coils installed in containers often generate interference reflections in the radar signal, which, however, become less or even disappear when the antenna opening angle is smaller.
  • a fundamental difference between sensors below 100 GHz and above 100 GHz is that the radar signal generated above 100 GHz is fed directly from the signal-generating semiconductors into the waveguide.
  • the semiconductor material on which the high-frequency circuit is located also has a radiator element, which in combination with an arrangement of coupling element and resonator element can form a primary radiator.
  • a primary radiator can either be coupled into a dielectric waveguide or directly illuminate a dielectric lens.
  • the semiconductor material can be glued to a circuit board using an adhesive layer.
  • the radar signal experiences as little signal attenuation as possible.
  • the radar signal is typically first transmitted via a circuit board that has at least one layer of high-frequency circuit board material. before the signal is fed into a waveguide or a coaxial conductor.
  • the waveguides which are predominantly used in 80 GHz sensors, have the task of transmitting the radar signal from the radar module to the antenna.
  • the waveguides which in this case are mainly designed as round waveguides, have a diameter of between 2.5 and 3.0 mm in this frequency range and can be produced relatively inexpensively in a sufficient length using deep hole drilling methods.
  • the length of the waveguide is fundamentally important with regard to the temperature decoupling between the process to be monitored and the sensor electronics.
  • the sensor electronics must not exceed a temperature of 85°C, whereas the process temperature can be up to 450°C. Temperature decoupling is carried out using appropriately long waveguides.
  • the waveguide diameters become increasingly smaller, since the cutoff frequency of the fundamental mode depends on the waveguide diameter.
  • the waveguide diameter is only 0.87 mm. With such a small diameter, it is considerably more complex to manufacture a waveguide of the same length than with a waveguide diameter at 80 GHz.
  • the present invention may have the advantage that metallic waveguides can be used as thermal decoupling elements even at higher frequencies.
  • the waveguide unit comprises a dielectric waveguide.
  • the dielectric waveguide can be made of plastic. Examples of this are HDPE, PVDF, FEP and PFA.
  • the dielectric waveguide can have any geometry as a cross-section.
  • the dielectric waveguide preferably has a round cross-section or a rectangular cross-section.
  • the plastic preferably has a lower relative permittivity and a low loss factor. This has an overall positive effect on the signal attenuation (i.e. low signal attenuation).
  • long dielectric waveguides can be manufactured easily and inexpensively using micro-injection molding or extrusion and also have lower signal attenuation compared to a metallic waveguide.
  • the combination of air volume between the dielectric lens and the waveguide and the manufacture of the waveguide from a plastic bring further advantages in terms of thermal decoupling.
  • the waveguide unit comprises a metallic waveguide.
  • the metallic waveguide can be made of metal and/or metal-coated plastic. Due to the spaced arrangement of the metallic waveguide and the dielectric Lens, a reduced length of the metallic waveguide can be advantageously realized, whereby the spacing still ensures thermal decoupling.
  • the metallic waveguide is suitable for operating frequencies below 100 GHz, but can also be advantageously used for operating frequencies above 100 GHz with the present arrangement.
  • the metallic waveguide is ideally placed so that one end of the metallic waveguide is in the focal point/focus of the dielectric lens.
  • the waveguide unit comprises a dielectric waveguide and a metallic waveguide.
  • the dielectric waveguide is preferably arranged between the primary radiator and the metallic waveguide.
  • the metallic waveguide is preferably arranged between the dielectric waveguide and the dielectric lens.
  • the metallic waveguide has an adaptation element for coupling in the radar beams and a beam element for emitting the radar beams.
  • adaptation element is to be understood broadly in the present case and preferably means a structural element that has a geometry that corresponds to a geometry of another structural element (e.g. primary radiator or dielectric waveguide) such that the radar beams can be transmitted.
  • the adaptation element is preferably part of the waveguide, preferably the metallic waveguide or the dielectric waveguide.
  • the adaptation element has an inner cone and the corresponding geometry of the dielectric waveguide of the common interface has an outer cone.
  • beam element is to be understood broadly in the present case and means a structural element that has a geometry that is designed to send and receive radar waves, e.g.
  • the beam element is preferably part of the waveguide, preferably the metallic waveguide or the dielectric waveguide. In other words, the beam element is designed to illuminate the dielectric lens.
  • the beam element is preferably located in the focus of the dielectric lens. Overall, the matching element and the beam element have a beneficial effect on signal transmission.
  • the dielectric waveguide has a matching element for coupling the radar beams and a beam element for emitting the radar beams.
  • the matching element is preferably part of the dielectric waveguide and differs from the rest of the dielectric waveguide by the Geometry.
  • the geometry of the matching element corresponds, for example, to the geometry of the primary radiator, so that they can achieve a surface contact. This advantageously enables good coupling of the radar beams.
  • the beam element is preferably part of the dielectric waveguide and differs from the rest of the dielectric waveguide in the geometry of the beam element.
  • the beam element preferably has a geometry that is suitable for sending and receiving radar beams, for example a spherical shape or a conical shape. Overall, the matching element and beam element have a beneficial effect on signal transmission.
  • air is located between the waveguide unit and the dielectric lens for thermal insulation. This has a beneficial effect on the thermal decoupling of the measuring electronics from the process. Air is a better insulator than metal. This can mean that the metallic waveguide can be shorter and therefore easier and cheaper to manufacture even at higher frequencies, while still achieving sufficient thermal decoupling.
  • the primary radiator comprises a radiator element, a coupling element and a resonator element.
  • the radiator element is preferably connected directly to the high-frequency electronics that generate the radar radiation.
  • the resonator element is preferably arranged between the radiator element and the coupling element.
  • the coupling element is made of PEEK, for example. This can have a positive effect on the quality of the measurement.
  • the dielectric waveguide comprises a plastic.
  • the plastic can be, for example, one of the following: HDPE, PVDF, FEP or PFA. This can advantageously realize a galvanic decoupling between the measuring electronics and the container.
  • a radar level measuring device in which a distance between the dielectric lens and the waveguide unit is derived from a geometry of the dielectric lens.
  • the dielectric lens has, for example, a spherical shape. This spherical shape results in a bundling of radar radiation emitted by the lens at a specific point outside or at a distance from the lens.
  • the arrangement of the waveguide unit, hollow guide or dielectric conductor, at this point, causes a beneficial increase in signal quality or transmission quality.
  • a radar level measuring device which is designed to measure at a frequency above 100 GHz. As the measuring frequency increases, the radiation cone of the emitted radiation from the radar level measuring device advantageously reduces. This can have a positive effect on the measurement accuracy, since interfering contours such as agitators or heating coils in a container do not contribute to the reflection of the radar radiation.
  • the waveguide unit comprises a beam element, wherein the beam element is arranged in the focus of the dielectric lens.
  • focus means the point at which the radar beams emitted by the dielectric lens are bundled. This can have a positive effect on the quality of the measurement.
  • a further aspect of the present invention comprises a system for detecting fill levels, comprising at least one radar fill level measuring device as described above and a container for storing a material.
  • the material can be liquid or solid or a combination thereof.
  • the container has an agitator for stirring the material.
  • the container has a heating coil for heating the material.
  • Figure 1 is a schematic view of a system according to the invention for detecting fill levels
  • Figure 2 shows a schematic section of a radar level measuring device according to the invention
  • Figure 3 shows a schematic section of a radar level measuring device according to the invention
  • Figure 4 shows a schematic section of a radar level measuring device according to the invention of a first embodiment
  • Figure 5 shows a schematic section of a radar level measuring device according to the invention of a second embodiment
  • Figure 6 shows a schematic section of an inventive
  • Figure 7 shows a schematic section of an inventive
  • Figure 1 shows a schematic view of a system 100 according to the invention for detecting fill levels.
  • the system 100 comprises a radar driver's station measuring device 101, described in more detail below.
  • the radar level measuring device 101 has a dielectric lens 102 in the lower area for transmitting and receiving radar beams.
  • An opening angle 103 of the emitted radar radiation is set depending on the measuring frequency.
  • the system also comprises a container 105 for storing a material 104, for example a liquid.
  • the container also comprises an agitator 106. It can be seen from the drawing that the radiation cone resulting from the opening angle 103 does not overlap with the agitator. This has a beneficial effect on the measurement accuracy, since no interfering reflections occur.
  • the system 100 can also comprise a heating coil (not shown).
  • FIG. 2 shows a schematic section of a radar level measuring device 200 according to the invention.
  • the radar level measuring device comprises at least one carrier plate (ie circuit board) 207.
  • a semiconductor material 201 is attached to the carrier plate 207 via an adhesive layer 204.
  • a high-frequency circuit (not shown) and a radiator element (not shown) are located on the semiconductor material.
  • Above the A resonator element 202 is located above the radiator element 202.
  • a coupling element 203 made of Peek is arranged above the resonator element 202.
  • the coupling element 203, the resonator element 202 and the radiator element form the primary radiator 206 in the present case.
  • the semiconductor material 201 is electrically connected to the carrier plate 207 via bonding wires 208.
  • a dielectric waveguide 205 is arranged above the primary radiator 206.
  • the primary radiator 206 sends the radar radiation generated by the frequency switching to the dielectric waveguide 205 or receives the radar radiation guided by the dielectric waveguide 205 and reflected by the surface of the material.
  • FIG. 3 shows a schematic section of a radar level measuring device 300 according to the invention in plan view.
  • the semiconductor material 304 is arranged on the carrier plate 303 and is electrically connected to the carrier plate 303 via the bonding wires 305.
  • the high-frequency circuit 302 and the radiator element 301 are arranged on the semiconductor material 304.
  • the resonator element 306 is arranged above the radiator element 301.
  • the radar radiation generated in the high-frequency circuit 302 is passed on to the radiator element 301 in order to be amplified from there by the resonator element 306.
  • the radar radiation reflected from the surface of the material and the radiation received by the radar level measuring device travel the same path, only in opposite directions.
  • FIG. 4 shows a schematic section of an embodiment of a radar level measuring device 400 according to the invention.
  • the radar level measuring device 400 comprises a primary radiator 405 for transmitting and receiving radar beams.
  • the primary radiator 405 is arranged on a semiconductor element 406 (as described above).
  • the radar level measuring device 400 further comprises a waveguide unit 407 for guiding the radar beams between the primary radiator 405 and the dielectric lens 404.
  • the waveguide unit 407 comprises a dielectric waveguide 408 and a metallic waveguide 401.
  • the dielectric waveguide 408 transmits the radar beams from the primary radiator 405 to the metallic waveguide 401 and vice versa.
  • the metallic waveguide 401 has an adaptation element 402, wherein the adaptation element 402 has an inner cone that corresponds to the outer cone of the dielectric waveguide 408. In the present case, the adaptation element 402 and the dielectric waveguide 408 lie on top of one another.
  • the adaptation element 402 is part of the metallic waveguide 401.
  • the metallic waveguide 401 also has a beam element 403, which is designed as an inner cone.
  • the beam element 403 is designed to emit and receive the radar beams 410.
  • the radar level measuring device 400 has further comprises a dielectric lens 404 for transmitting and receiving the radar beams.
  • the dielectric lens 404 and the waveguide unit 407, in particular the beam element 403 of the metallic waveguide 401, are arranged at a distance from one another.
  • the distance 409 results from the geometry of the dielectric lens 404.
  • the distance preferably comprises the focal length of the dielectric lens 404.
  • the beam element 403 is located approximately in the focus of the dielectric lens 404.
  • the space between the dielectric lens 404 and the beam element 403 is filled with air in the present case.
  • FIG. 5 shows a schematic section of a radar level measuring device 500 according to the invention in a second embodiment.
  • the waveguide unit 506 in the present case has only one dielectric waveguide 501.
  • the dielectric waveguide 501 is arranged between the primary radiator 505 and the dielectric lens 504.
  • the dielectric waveguide 501 in the present case has a beam element 503 and an adaptation element 502.
  • the beam element 503 of the dielectric waveguide 501 is arranged at a distance from the dielectric lens 504.
  • the spacing in turn results from the geometry of the dielectric lens 504. The spacing advantageously brings about thermal and galvanic decoupling.
  • FIG 6 shows a schematic section of a radar level measuring device 600 according to the invention of a first embodiment according to the invention.
  • a metallic housing 601 of the radar level measuring device 600 is also shown here.
  • the radar level measuring device 600 also has an interface 603 for power supply and data exchange, for example implemented with an M12 connection.
  • the radar level measuring device 600 here has a plurality of carrier plates 604, 605 and 606, which are used for the power supply, the control and the high-frequency circuit for generating and processing radar beams. These are electrically connected to one another via connectors 607.
  • the radar level measuring device 600 has a metallic process connection 602 in the lower region of the housing 601.
  • the dielectric lens 608 as well as the metallic waveguide 609 and at least partially the dielectric waveguide 610 are arranged in the metallic process connection 602.
  • the connection or arrangement can be made, for example, by means of a material-locking or mechanical joining process.
  • the metallic waveguide 609 is screwed into the metallic process connection 602 via a thread.
  • the dielectric lens 608 is in the metallic process connection 602 sealed.
  • FIG 7 shows a schematic section of a radar level measuring device 700 according to the invention in a second embodiment.
  • the radar level measuring device 700 again has a housing 701 and a process connection 702.
  • the radar level measuring device 700 only has a dielectric waveguide 703, which is arranged in the process connection 702 via a holder 704.
  • the dielectric lens 705 is again arranged in a sealing manner in the process connection 702.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un dispositif radar de mesure de niveau de remplissage pour détecter des niveaux de remplissage dans des récipients, comprenant : un émetteur primaire pour émettre et recevoir des faisceaux radar ; une lentille diélectrique pour transmettre et recevoir les faisceaux radar ; une unité de guide d'ondes pour guider les faisceaux radar entre l'émetteur primaire et la lentille diélectrique, la lentille diélectrique et l'unité de guide d'ondes étant espacées l'une de l'autre.
PCT/EP2024/066225 2023-06-30 2024-06-12 Dispositif radar de mesure de niveau de remplissage pour détecter des niveaux de remplissage dans des récipients Ceased WO2025002812A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP24732672.1A EP4735841A1 (fr) 2023-06-30 2024-06-12 Dispositif radar de mesure de niveau de remplissage pour détecter des niveaux de remplissage dans des récipients
CN202480042959.3A CN121399436A (zh) 2023-06-30 2024-06-12 用于在容器中检测液位的雷达液位测量装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023206192.9 2023-06-30
DE102023206192.9A DE102023206192A1 (de) 2023-06-30 2023-06-30 Radarfüllstandsmessgerät zur Erfassung von Füllständen in Behältern

Publications (1)

Publication Number Publication Date
WO2025002812A1 true WO2025002812A1 (fr) 2025-01-02

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EP (1) EP4735841A1 (fr)
CN (1) CN121399436A (fr)
DE (1) DE102023206192A1 (fr)
WO (1) WO2025002812A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102023206192A1 (de) 2023-06-30 2025-01-02 Vega Grieshaber Kg Radarfüllstandsmessgerät zur Erfassung von Füllständen in Behältern

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EP2698869B1 (fr) * 2012-08-15 2015-01-28 Krohne Messtechnik GmbH Fenêtre de micro-ondes et système de mesure du niveau de remplissage fonctionnant selon le principe de radar
DE102019200500B4 (de) * 2019-01-16 2020-10-08 Vega Grieshaber Kg Radarsensor mit Linsenantenne
WO2022017701A1 (fr) * 2020-07-23 2022-01-27 Endress+Hauser SE+Co. KG Antenne de dispositifs de mesure de niveau de remplissage radar
WO2023009465A1 (fr) * 2021-07-24 2023-02-02 Rochester Sensors, Llc Dispositif, système et procédé de rayonnement micro-ondes guidé sans tige
WO2023104492A1 (fr) * 2021-12-09 2023-06-15 Endress+Hauser SE+Co. KG Compteur de niveau de remplissage
DE102023206192A1 (de) 2023-06-30 2025-01-02 Vega Grieshaber Kg Radarfüllstandsmessgerät zur Erfassung von Füllständen in Behältern

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Publication number Publication date
CN121399436A (zh) 2026-01-23
EP4735841A1 (fr) 2026-05-06
DE102023206192A1 (de) 2025-01-02

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