EP4260023A1 - Hochfrequenz-modul für ein füllstandsmessgerät - Google Patents
Hochfrequenz-modul für ein füllstandsmessgerätInfo
- Publication number
- EP4260023A1 EP4260023A1 EP21823216.3A EP21823216A EP4260023A1 EP 4260023 A1 EP4260023 A1 EP 4260023A1 EP 21823216 A EP21823216 A EP 21823216A EP 4260023 A1 EP4260023 A1 EP 4260023A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- waveguide segment
- frequency module
- measuring device
- waveguide
- transmitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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- 238000005259 measurement Methods 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 3
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
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- 238000004801 process automation Methods 0.000 description 1
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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
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/027—Constructional details of housings, e.g. form, type, material or ruggedness
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
-
- 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
- the invention relates to a high-frequency module for filling level measuring devices that can be designed in a compact and modular manner.
- Appropriate field devices are used in process automation technology to record relevant process parameters.
- suitable measurement principles are implemented in the corresponding field devices in order to record a fill level, a flow rate, a pressure, a temperature, a pH value, a redox potential or a conductivity as process parameters.
- a wide variety of such field device types are manufactured and sold by the company Endress + Hauser.
- Non-contact measuring methods have become established for level measurement of filling goods in containers, as they are robust and low-maintenance. Another advantage of non-contact measuring methods is the ability to measure the level almost continuously. In the field of continuous level measurement, radar-based measurement methods are therefore predominantly used (in the context of this patent application, the term “radar” refers to signals or electromagnetic waves with frequencies between 0.03 GHz and 300 GHz).
- An established measurement method is FMCW (“Frequency Modulated Continuous Wave”). The FMCW-based level measurement method is described, for example, in the published application DE 102013 108 490 A1.
- the antenna arrangement of radar-based fill level measuring devices must be attached with direct contact to the inside of the container, since there must not be a barrier between the antenna arrangement and the filling material that is impermeable to radar signals.
- the electronic modules of the level measuring device such as the radar-specific high-frequency module for high-frequency signal generation and other units for data processing and transmission, on the other hand, are housed outside the container in a separate device housing. Because a physical separation is often used primarily for explosion protection purposes between the active modules, i.e. modules supplied with electricity, and the passive antenna arrangement.
- the device housing includes a measuring device neck, via which the antenna arrangement is mechanically connected to the device housing.
- a corresponding explosion protection barrier is arranged in the measuring device neck gene antenna arrangement.
- the neck of the measuring device may have to fulfill other protective functions: Depending on the application, high temperatures, high pressure or dangerous gases prevail inside the container. Therefore, depending on the application, the meter neck must function as a pressure seal, a temperature barrier, and/or a media seal.
- the device housing and the (interface) modules contained therein can also serve as a platform for other types of field devices in addition to level measuring devices, and so that the device housing can be designed to be more compact overall, the high-frequency module specific to radar-based level measuring devices can be used be outsourced to the gauge neck.
- the spatial conditions in the neck of the measuring device are extremely limited due to thermal and explosion protection-specific requirements. For this reason, accommodating the radar-specific high-frequency module in the neck of the measuring device is difficult.
- the connection of the high-frequency module to the antenna arrangement is also challenging, since the connection must be detachable and any plug-in connections between the corresponding waveguide segments increase the risk of high-frequency interference.
- the invention is therefore based on the object of providing a filling level measuring device that can be designed in a compact and modular manner.
- the invention solves this problem with a high-frequency module for radar-based level gauges.
- the high-frequency module includes the following components:
- a transmit/receive unit that is designed o to generate corresponding radar signals according to a defined measurement principle, and o to determine the level after the radar signals have been reflected on the surface of the product using the corresponding received signals according to the measuring principle
- the waveguide segment is attached to a passage in the electronics encapsulation in such a way that the waveguide segment is led out of the electronics encapsulation.
- the transmitter/receiver unit is attached at least indirectly to the waveguide segment by means of a corresponding attachment means.
- the transmitter/receiver unit or printed circuit board to which it is attached is self-supporting within the electronics encapsulation.
- the transmitter/receiver unit can also be arranged on a circuit board, so that the transmitter/receiver unit is attached to the waveguide segment via the circuit board.
- This indirect attachment of the transmitter/receiver unit to the electronics encapsulation via the waveguide segment means that there is no need to directly attach the transmitter/receiver unit (or the printed circuit board) to the electronics encapsulation.
- the printed circuit board and thus the electronics encapsulation can be designed to be very compact, so that the high-frequency module can also be designed to be more compact overall. This in turn simplifies the accommodation of the high-frequency module in the level gauge.
- the terms "unit” or “module” are understood to mean, in principle, any electronic circuit that is designed to be suitable for the intended application, for example for high-frequency generation or as an interface.
- the corresponding unit can therefore have an analog circuit for generating or processing corresponding analog signals include.
- the unit can also comprise a digital circuit such as an FPGA or a storage medium in cooperation with a program.
- the program is designed to carry out the corresponding procedural steps or to apply the necessary arithmetic operations of the respective unit.
- different electronic units or modules of the measuring device within the meaning of the invention can potentially also access a common physical memory or be operated using the same physical digital circuit.
- the transmission/reception unit for controlling the antenna arrangement via the waveguide can be based, for example, on the FMCW method or the pulse propagation time method.
- the waveguide segment can be attached to the feedthrough of the electronics encapsulation by means of a screw connection.
- Any screw connection can be designed in particular with an external thread on the waveguide segment aligned along the waveguide axis such that the waveguide segment is countered by a corresponding nut against the passage of the electronics encapsulation.
- the fill level measuring device has to include the following components in addition to the high-frequency module according to one of the embodiment variants described above:
- An antenna arrangement which can be controlled via a high-frequency connection, so that o the radar signal can be emitted towards the filling material, and o so that a reception signal can be received after the radar signal has been reflected on the filling material surface, and - a device housing connected to the antenna arrangement or the high-frequency connection, in which the high-frequency module is arranged in such a way that the waveguide segment is positively connected to the high-frequency connection or a galvanic isolation along a common waveguide axis, which is introduced on both sides between the high-frequency connection and the waveguide segment.
- the high-frequency module can be arranged within the scope of the invention, in particular in the measuring device neck of the device housing, since the electronics -Module according to the invention can be interpreted very compactly.
- the high-frequency connection and the waveguide segment of the high-frequency module can be tuned to the corresponding frequency or mode of the radar signal.
- the high-frequency connection and the waveguide segment can be designed within the scope of the invention, for example, as a waveguide with a correspondingly dimensioned cross section.
- Fig. 1 A radar-based level gauge on a container
- Fig. 1 shows a container 3 with a filling 2, the filling level L to determine is.
- the container 3 can be up to more than 100 m high.
- the conditions in the container 3 also depend on the type of filling material 2 and the area of application. In the case of exothermic reactions, for example, high temperatures and pressures can occur. In the case of dusty or flammable substances, appropriate explosion protection conditions must be observed inside the container.
- a radar-based filling level measuring device 1 is attached to the container 3 at a known installation height h above the filling material 2 .
- the fill-level measuring device 1 is attached or aligned to a corresponding (flange) opening of the container 3 in such a way that an antenna arrangement 10 of the fill-level measuring device 1 is directed vertically into the container 3 towards the filling material 2 .
- the rest of the device housing 13 of the fill level measuring device 1, in which the electronic components 11 are accommodated, is arranged outside the container passage.
- the spatial separation of the electronic components 11 in the device housing 13 from the antenna arrangement 10 or from the interior of the container by a measuring device neck 131 guarantees explosion protection within the container 3 on the one hand.
- the electronic components 10 in the device housing 13 or in the measuring device neck 131 are protected against temperature and pressure loads from the interior of the container.
- the measuring device neck 131 has corresponding cooling ribs for thermal decoupling of the device housing 13 .
- the arrangement on the container 3 makes it possible for the level measuring device 1 to emit radar signals SHF vertically via the antenna arrangement 10 in the direction of the surface of the filling material 2 . After reflection on the surface of the filling material, the level measuring device 1 receives the reflected radar signals RHF again via the antenna arrangement 10.
- the signal propagation time between transmission and reception of the respective radar signal SHF, RHF is proportional to the distance d between the level measuring device 1 and the filling 2
- the signal propagation time from Level measuring device 1 can be determined, for example, by means of the FMCW or by means of the pulse propagation time method. Accordingly, the fill-level measuring device 1 can assign the measured running time to the respective distance d, for example on the basis of a corresponding calibration.
- the level gauge 1 is housed in the device housing 13 interface module, such as "PROFIBUS", “HART” or “Wireless HART” with a higher-level unit 4, such. B. a process control system connected.
- the filling level value L can be transmitted via this, for example in order to control inflows or outflows of the container 3 if necessary.
- other information about the general operating status of the fill-level measuring device 1 can also be communicated.
- the antenna arrangement 10 within the fill-level measuring device 1 is controlled in terms of high-frequency by a high-frequency module 11, 12, 120.
- the FMCW or pulse transit time measuring principle for example, is implemented in a correspondingly designed transmission/reception unit 11 of the high-frequency module 11, 12, 120 for determining the signal propagation time based on the incoming reception signal RHF.
- the transmission/reception unit 11 is used to generate the radar signal SHF to be transmitted.
- the transmitter/receiver unit 11 in the embodiment variant shown is arranged inside the neck 131 of the measuring device, for example as a monolithically encapsulated SMD component on a side of a printed circuit board facing the antenna arrangement 10 .
- the printed circuit board, together with the transmitter/receiver unit 11, is enclosed by an electronics encapsulation 12 for the high-frequency module 11, 12, 120.
- the electronics encapsulation 12 can be made of a plastic such as PC, PE, PP or PA can be manufactured.
- this makes it possible to additionally encapsulate the printed circuit board together with the transmitter/receiver unit 11 by means of casting compound for explosion protection purposes (not shown explicitly in FIG. 2).
- the inventive coupling of the transmission/reception unit 11 to the antenna arrangement 10 is made possible by means of the high-frequency module 11 , 12 , 120 .
- the antenna arrangement in the embodiment variant shown in FIG. 2 comprises a straight waveguide segment 100 as the high-frequency connection 100, via which the antenna arrangement 10 can be contacted by the high-frequency module 11, 12, 120 in terms of high-frequency technology.
- the high-frequency module 11, 12, 120 is assigned a waveguide segment 120, which is also designed in a straight line orthogonal to the printed circuit board from the transmitter/receiver unit 11 gene high-frequency connection 100 emanates.
- the waveguide segment 120 is fastened to a leadthrough 121 of the electronics encapsulation 12 via a screw connection 122 in such a way that the waveguide segment 120 is passed through the wall of the electronics encapsulation 12 to the outside.
- the waveguide segment 120 has an external thread around the hollow space aligned with the waveguide axis a, so that the waveguide segment 120 is countered by a corresponding nut from the outside against the electronics encapsulation 12, as shown in Fig. 2 is the case.
- the waveguide segment 120 can also be correspondingly fastened to the passage of the electronics encapsulation 12 with an alternative fastening, for example by means of pins.
- the printed circuit board on which the transmitter/receiver unit 11 is arranged within the electronics encapsulation 12 is mounted on the waveguide segment 120 by means of at least one fastening means.
- the fastening means can be an adhesive connection or, in turn, a pin or screw connection.
- the printed circuit board or the transmitter/receiver unit 11 is self-supporting within the electronics encapsulation 12 . That is, due to the indirect fixation via the waveguide segment 120, the transmitter/receiver unit 11 does not require a direct one Fixation to electronics encapsulation 12 hm.
- the printed circuit board and thus the electronics encapsulation 12 can be designed to be very compact overall, so that the accommodation of the high-frequency module 11, 12, 120 in the neck 131 of the measuring device is simplified.
- further printed circuit boards 15 can also be arranged within the electronics encapsulation 12 of the high-frequency module 11 , 12 , 120 in addition to the transmitter/receiver unit 11 . As shown in the illustration, these can be connected electrically, for example by means of a mechanically flexible cable harness, to the printed circuit board on which the transmitter/receiver unit 11 is arranged.
- the transmitter/receiver unit 11 and any other printed circuit boards 15 for the production of the high-frequency module 11, 12, 120 can be used, for example, by means of an assembly aid that is a negative mold of the transmitter/receiver unit 11 or the other Printed circuit board 15 is designed to be inserted from a side of the electronic encapsulation 12 facing away from the implementation 121 .
- the high-frequency connection 100 designed as a waveguide and the waveguide segment 120 of the high-frequency module 11, 12, 120 fit together (or the high-frequency connection 100 and the waveguide segment 120 each border a galvanic isolation 140 arranged between them with such a precise fit) that the waveguide segments 100, 120 form a common waveguide axis a.
- the high-frequency module 11, 12, 120 is designed in the variant shown in FIG. is guided accordingly in the direction of the waveguide axis a of the waveguide segments 100, 120.
- Corresponding guide element 14 is formed radially symmetrically around second waveguide segment 120 .
- the optional galvanic isolation 140 made of plastic or ceramic shown in FIG. 2 serves to electrically decouple the antenna arrangement 10 from the transmitter/receiver unit 11 or from the other electronic components in the device housing 13 .
- the galvanic isolation 140 is arranged with a precise fit between the high-frequency connection 100 and the waveguide segment 120, with the galvanic isolation 140 being made of an electrically insulating material such as a ceramic or a plastic and having a bushing corresponding to the internal cross section of the waveguides 100, 120 having.
- a spring presses according to the invention.
- Element 130 the electronics encapsulation under the guidance of the guide element 14 from the inside of the measuring device neck 131, starting from the antenna arrangement 10 in such a way that the waveguide segment 120 is pressed with the corresponding spring force against the waveguide of the high-frequency connection 100. This in turn ensures loss-free signal transmission.
- the spring element 130 is designed as a wave spring. The wave spring 130 is clamped in the interior of the measuring device neck 131 between a groove or a securing ring 132 and that outside of the electronics encapsulation 12 which faces away from the waveguide segment 120 .
- the spring element 130, 133 is designed to press from the inside against the guide element 14 of the electronics encapsulation 12 when the high-frequency module 11, 12, 120 is inserted in the measuring device neck 131, so that an annular outer bead of the guide element 14 snaps into a corresponding groove on the measuring device neck 131 on the outside.
- the positions of the spring ring 133, the outer bead and the groove are chosen so far down that the waveguide segment 120 is again pressed with a defined tensile stress without a gap against the high-frequency connection 100 of the antenna arrangement 10.
- the pressing of the waveguide segment 120 according to the invention against the high-frequency connection 100 can also be implemented when the electronics encapsulation 12 is accommodated directly in the device housing 13 . This can be the case when the device housing 13 of the level measuring device 1 does not include a measuring device neck 131 or when the waveguide-shaped high-frequency connection 100 extends through the entire measuring device neck 131 .
- the pressing of the individual waveguide segments 100, 120 according to the invention can also be implemented if they are not designed as waveguides but, for example, as dielectric waveguides. reference number
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020133198.3A DE102020133198B4 (de) | 2020-12-11 | 2020-12-11 | Hochfrequenz-Modul für ein Füllstandsmessgerät sowie Füllstandsmessgerät |
| PCT/EP2021/083096 WO2022122408A1 (de) | 2020-12-11 | 2021-11-26 | Hochfrequenz-modul für ein füllstandsmessgerät |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4260023A1 true EP4260023A1 (de) | 2023-10-18 |
Family
ID=78828129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21823216.3A Withdrawn EP4260023A1 (de) | 2020-12-11 | 2021-11-26 | Hochfrequenz-modul für ein füllstandsmessgerät |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240035873A1 (de) |
| EP (1) | EP4260023A1 (de) |
| CN (1) | CN116635744A (de) |
| DE (1) | DE102020133198B4 (de) |
| WO (1) | WO2022122408A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024110019A1 (de) * | 2024-04-10 | 2025-10-16 | Endress+Hauser SE+Co. KG | Füllstandsmessgerät |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19752808C2 (de) * | 1997-11-28 | 2001-12-06 | Grieshaber Vega Kg | Antenneneinrichtung für ein Füllstandmeß-Radargerät |
| US6300897B1 (en) * | 1999-07-02 | 2001-10-09 | Rosemount Inc. | Stabilization in a radar level gauge |
| DE112004000368T5 (de) | 2003-03-04 | 2006-03-16 | Saab Rosemount Tank Radar Ab | Verfahren und Vorrichtung für ein Radarfüllstandsmesssystem |
| US8711049B2 (en) * | 2005-08-04 | 2014-04-29 | Vega Grieshaber Kg | Potential separation for filling level radar |
| DE102005054233A1 (de) | 2005-11-14 | 2007-05-16 | Grieshaber Vega Kg | Hohlleiterübergang |
| US7701385B2 (en) * | 2008-05-22 | 2010-04-20 | Rosemount Tank Radar Ab | Multi-channel radar level gauge system |
| DE102009026433A1 (de) * | 2009-05-25 | 2010-12-09 | Endress + Hauser Gmbh + Co. Kg | Anordnung zur Füllstandsmessung mit einem mit Mikrowellen arbeitenden Füllstandsmessgerät |
| US8800363B2 (en) * | 2010-12-02 | 2014-08-12 | Rosemount Tank Radar Ab | Radar level gauge with dielectric rod connection |
| DE102011010801B4 (de) * | 2011-02-09 | 2016-01-07 | Krohne Messtechnik Gmbh | Mikrowellensendeeinrichtung und Füllstandmessgerät |
| US9212942B2 (en) | 2012-07-04 | 2015-12-15 | Vega Grieshaber Kg | Waveguide coupling, high-frequency module, fill-level radar and use |
| US9212941B2 (en) * | 2013-03-12 | 2015-12-15 | Rosemount Tank Radar Ab | High temperature, high pressure (HTHP) radar level gauge |
| DE102013108490A1 (de) | 2013-08-07 | 2015-02-12 | Endress + Hauser Gmbh + Co. Kg | Dispersionskorrektur für FMCW-Radar in einem Rohr |
| DE202016103966U1 (de) | 2016-07-21 | 2016-08-05 | Vega Grieshaber Kg | Radarmessgerät, insbesondere ein Radar-Füllstandmessgerät |
| DE102018132285A1 (de) * | 2018-12-14 | 2020-06-18 | Endress+Hauser SE+Co. KG | Füllstandsmessgerät |
| CN111982240B (zh) * | 2020-09-30 | 2023-04-25 | 北京古大仪表有限公司 | 一种雷达物位计 |
-
2020
- 2020-12-11 DE DE102020133198.3A patent/DE102020133198B4/de active Active
-
2021
- 2021-11-26 EP EP21823216.3A patent/EP4260023A1/de not_active Withdrawn
- 2021-11-26 WO PCT/EP2021/083096 patent/WO2022122408A1/de not_active Ceased
- 2021-11-26 CN CN202180082335.0A patent/CN116635744A/zh not_active Withdrawn
- 2021-11-26 US US18/256,977 patent/US20240035873A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20240035873A1 (en) | 2024-02-01 |
| DE102020133198B4 (de) | 2023-10-05 |
| DE102020133198A1 (de) | 2022-06-15 |
| WO2022122408A1 (de) | 2022-06-16 |
| CN116635744A (zh) | 2023-08-22 |
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