EP1451537A1 - Appareil de mesure de niveau - Google Patents

Appareil de mesure de niveau

Info

Publication number
EP1451537A1
EP1451537A1 EP02787881A EP02787881A EP1451537A1 EP 1451537 A1 EP1451537 A1 EP 1451537A1 EP 02787881 A EP02787881 A EP 02787881A EP 02787881 A EP02787881 A EP 02787881A EP 1451537 A1 EP1451537 A1 EP 1451537A1
Authority
EP
European Patent Office
Prior art keywords
outer conductor
conductor
inner conductor
microwaves
antenna
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Withdrawn
Application number
EP02787881A
Other languages
German (de)
English (en)
Inventor
Winfried Maier
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.)
Endress and Hauser SE and Co KG
Original Assignee
Endress and Hauser SE and 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 and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Publication of EP1451537A1 publication Critical patent/EP1451537A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/02—Waveguide horns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0485—Dielectric resonator antennas

Definitions

  • the invention relates to a level measuring device working with microwaves.
  • microwaves are sent to the surface of a medium by means of an antenna and the echo waves reflected on the surface are received.
  • An echo function representing the echo amplitudes as a function of the distance is formed, from which the probable useful echo and its transit time are determined.
  • the distance between the product surface and the antenna is determined from the transit time.
  • Dielectric rod antennas and horn antennas for transmitting and / or receiving are regularly used in industrial measurement technology.
  • a housing is frequently used which has a housing section which has the geometry of a short-circuited waveguide.
  • An excitation element is inserted into the housing section with the waveguide geometry, via which microwaves are transmitted and / or received through the housing section.
  • the microwaves are generated by a remote microwave generator and transported via coaxial lines to a transmitting or transmitting and receiving element.
  • the transmission or transmission and reception element converts supplied wired microwaves into microwaves that propagate in free space and vice versa.
  • the housing is adjoined by a funnel-shaped section which widens in the direction facing the container and forms the horn.
  • a rod made of a dielectric is provided in the container.
  • the interior of the housing is usually almost completely filled by an insert made of a dielectric.
  • the insert has a conical end pointing into the container.
  • the insert is followed by the rod-shaped antenna pointing into the container.
  • the housing is regularly made of metal and is referred to below as the outer conductor.
  • the dielectric insert and its conical end or the subsequent rod-shaped antenna is referred to below as the inner conductor.
  • FIG. 1 schematically shows a container 1, on the left side of which a level meter 3 equipped with a horn antenna and on the right side of which a level meter 5 equipped with a rod antenna is shown.
  • the inner conductor consists of a dielectric and the outer conductor consists of a metal, different materials with different thermal expansion coefficients meet here.
  • the inner conductor is fixed in the outer conductor by means of a press fit or shrink fit and, since these methods alone do not offer sufficient security.
  • the invention consists in a level measuring device working with microwaves
  • the one metallic outer conductor and one has ceramic inner conductor
  • the inner conductor and the outer conductor in the area of the press fit have conical outer surfaces of the same shape.
  • PFA perfluoroalkoxy
  • the invention further consists in a method for producing a
  • the metallic outer conductor is heated to a temperature close to but below a sintering temperature of the coating
  • the ceramic inner conductor is heated to a temperature which is approximately equal to a maximum temperature at which the coating is durable in the long run.
  • An advantage of the invention is that there is a gas-tight and pressure-tight seal between the inner conductor and the outer conductor in a very simple and therefore inexpensive manner.
  • fluorothermoplastics are chemically very stable and can be used at very high temperatures for a plastic.
  • FIG. 1 shows a schematic illustration of a level measuring device with a horn antenna mounted on a container and a level measuring device with a rod antenna mounted on the same container; and Fig. 2 shows schematically the inner and outer conductors of a level measuring device according to the invention.
  • Fig. 2 shows a section of the level measuring device shown in Fig. 1 with the horn antenna.
  • the invention also applies analogously to rod antennas.
  • the fill level measuring device has an antenna for transmitting or for transmitting and receiving microwaves.
  • the antenna comprises a metallic outer conductor 7 and a ceramic inner conductor 9.
  • the metallic outer conductor 7 has a first and a second section 11, 13.
  • the first section 11 is essentially cylindrical on the outside.
  • a flange 14 is formed on the first section 11, by means of which the fill level measuring device 3 is to be fastened on the container 1.
  • the second section 13 is a funnel-shaped horn that is screwed onto an end of the first section 11 pointing into the container 1.
  • the inner conductor 9 is introduced into the first section 11 and fastened there by means of hot pressing. It has an outer, slightly conical outer surface 15 in the area of the press fit, the shape of which is identical to the shape of an inner, slightly conical outer surface 7 of the outer conductor 7 in the area of the press fit.
  • the cones are designed such that a cone diameter decreases in the direction away from the container.
  • the inner conductor 9 opens into the horn of the outer conductor 7 with a conical tip 17.
  • a coating 19 made of a fluorothermoplastic is provided on the inner conductor 9.
  • the outer conductor 7 can also be provided with a coating in the area of the press fit.
  • Perfluoroalkoxy is preferably used for the coating.
  • Perfluoroalkoxy (PFA) is chemically highly resistant and can be used at temperatures up to 260 ° C.
  • the coating 19 is applied, for example, by applying a primer with a layer thickness of 10 ⁇ m to 20 ⁇ m to the fat-free, sand-blasted area to be coated.
  • the fill level measuring device is then produced by heating the metallic outer conductor 7 to a temperature close to but below a sintering temperature of the coating 19.
  • the sintering temperature of perfluoroalkoxy (PFA) is around 360 ° C to 400 ° C.
  • the outer conductor 7 would thus be e.g. heat to a temperature of 300 ° C.
  • the ceramic inner conductor 9 is heated to a temperature which is approximately equal to a maximum temperature at which the coating 19 is durable in the long run.
  • the inner conductor 9 could e.g. be heated to approx. 150 ° C.
  • the inner conductor 9 is then inserted into the outer conductor 7 under pressure.
  • the heat causes the coating 19 to melt and adapts optimally to the geometries and surfaces of the inner and outer conductors 7, 9.
  • the antenna is then cooled to ambient temperature in air or in a water bath.
  • the coating 19 melts and fills any grooves and / or cone differences and similar irregularities that are present without pores.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un appareil de mesure de niveau comprenant une antenne pour l'émission ou pour l'émission/réception de micro-ondes présentant un conducteur externe métallique (7) et un conducteur interne en céramique (9). Le conducteur interne est fixé, résistant à la pression et étanche au gaz, dans le conducteur externe (7), cependant qu'il est prévu sur le conducteur interne (9) ou dans le conducteur externe (7), un revêtement en fluorothermoplaste. Le conducteur interne (9) est fixé, par insertion à chaud, dans le conducteur externe (7), le conducteur interne (9) et le conducteur externe (7) présentant, dans la zone d'ajustage serré, des surfaces de recouvrement coniques de forme identique (15).
EP02787881A 2001-12-04 2002-11-30 Appareil de mesure de niveau Withdrawn EP1451537A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10159394A DE10159394A1 (de) 2001-12-04 2001-12-04 Füllstandsmessgerät
DE10159394 2001-12-04
PCT/EP2002/013540 WO2003048696A1 (fr) 2001-12-04 2002-11-30 Appareil de mesure de niveau

Publications (1)

Publication Number Publication Date
EP1451537A1 true EP1451537A1 (fr) 2004-09-01

Family

ID=7707900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02787881A Withdrawn EP1451537A1 (fr) 2001-12-04 2002-11-30 Appareil de mesure de niveau

Country Status (5)

Country Link
US (1) US7009408B2 (fr)
EP (1) EP1451537A1 (fr)
AU (1) AU2002352199A1 (fr)
DE (1) DE10159394A1 (fr)
WO (1) WO2003048696A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004022516B4 (de) * 2004-05-05 2017-01-19 Endress + Hauser Gmbh + Co. Kg Hornantenne
US7012572B1 (en) * 2004-07-16 2006-03-14 Hrl Laboratories, Llc Integrated ultra wideband element card for array antennas
US7009577B1 (en) * 2004-09-02 2006-03-07 Siemens Milltronics Process Instruments, Inc. Mounting mechanism for securing an antenna in a level measurement device
DE602005020434D1 (de) * 2005-06-13 2010-05-20 Siemens Milltronics Proc Instr Hornantenne mit Verbundwerkstoffstrahler
DE102005036844A1 (de) * 2005-08-04 2007-02-08 Vega Grieshaber Kg Potentialtrennung für Füllstandradar
DE102008015409B4 (de) * 2008-03-20 2015-07-30 KROHNE Meßtechnik GmbH & Co. KG Dielektrische Hornantenne
DE102008048673A1 (de) * 2008-09-24 2010-04-08 Festo Ag & Co. Kg Fluidische Zylinderanordnung mit einer Mikrowellen-Messvorrichtung zur Erfassung der Kolbenposition
DE102013104699A1 (de) * 2013-05-07 2014-11-13 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung des Füllstandes mittels einer Helixantenne
US9568675B2 (en) * 2013-07-03 2017-02-14 City University Of Hong Kong Waveguide coupler
DE102014118867B4 (de) 2014-10-06 2023-12-28 Krohne Messtechnik Gmbh Nach dem Radarprinzip arbeitendes Füllstandmessgerät und Übertragungsstrecke für ein Füllstandmessgerät
DE102015116273B4 (de) 2015-09-25 2017-04-20 Krohne S. A. S. Sondenhalterung mit Abstandhalter
US10367257B2 (en) * 2015-11-06 2019-07-30 Hyundai Motor Company Antenna, vehicle having the antenna, and method for controlling the antenna
EP3168581B1 (fr) * 2015-11-13 2022-01-19 VEGA Grieshaber KG Antenne a cornet et appareil de mesure de niveau de remplissage radar dote d'une antenne a cornet
CN109708723B (zh) * 2018-11-21 2020-11-10 北京古大仪表有限公司 一种雷达物位计
EP3696516B1 (fr) * 2019-02-18 2022-04-27 VEGA Grieshaber KG Module radar
EP4053517B1 (fr) * 2021-03-01 2023-10-25 Rosemount Tank Radar AB Structure de traversée de réservoir pour une jauge de niveau radar et procédé de fabrication d'un agencement de couplage pour une structure de traversée de réservoir

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DE3628670A1 (de) * 1986-08-23 1988-02-25 Volkmar Eigenbrod Verfahren zum kunststoffbeschichten und nach dem verfahren hergestellte beschichtung
DE3805766A1 (de) * 1988-02-24 1989-09-07 Hoechst Ag Verfahren zur herstellung von pulverbeschichtungen aus fluorthermoplasten
DE4011801A1 (de) * 1990-04-12 1991-10-17 Messer Griesheim Gmbh Verfahren zum thermischen beschichten von oberflaechen mit einem fluorpolymeren
DE4340943A1 (de) * 1993-12-01 1995-06-08 Hoechst Ag Wäßrige Dispersion von Fluorpolymerisaten, ihre Herstellung und Verwendung für Beschichtungen
DE4437374C2 (de) * 1994-10-19 1997-08-21 Danfoss As Durchflußmesser mit einem keramischen Meßrohr
WO1997012211A1 (fr) * 1995-09-29 1997-04-03 Rosemount Inc. Guide de micro-ondes pour detecteurs de niveau de reservoir
DE19752808C2 (de) * 1997-11-28 2001-12-06 Grieshaber Vega Kg Antenneneinrichtung für ein Füllstandmeß-Radargerät
EP0922942A1 (fr) * 1997-12-10 1999-06-16 Endress + Hauser GmbH + Co. Appareil de mesure à micro-ondes de niveau de remplissage avec un diélectrique inséré et processus pour la fabrication du diélectrique
EP0947812A1 (fr) * 1998-03-28 1999-10-06 Endress + Hauser GmbH + Co. Capteur du niveau à microondes
DE29812024U1 (de) * 1998-07-06 1998-09-17 Vega Grieshaber Kg, 77709 Wolfach Mikrowellen-Füllstandsmeßgerät mit verbesserter Signalqualität
DE19922606B4 (de) * 1999-05-17 2004-07-22 Vega Grieshaber Kg Anordnung aus einem Hohlleiter und einer Antenne
DE10028807A1 (de) * 2000-05-15 2001-11-29 Krohne Messtechnik Kg Füllstandsmeßgerät
US6750657B2 (en) * 2000-11-23 2004-06-15 Vega Grieshaber Kg Combination of a feedthrough element for an electric high-frequency signal and a probe, and a level meter metering device including a combination of this type
DE10060068C1 (de) * 2000-12-01 2002-06-27 Krohne Messtechnik Kg Füllstandsmeßgerät
US6834546B2 (en) * 2003-03-04 2004-12-28 Saab Rosemount Tank Radar Ab Device and method in a level gauging system

Non-Patent Citations (1)

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Title
See references of WO03048696A1 *

Also Published As

Publication number Publication date
AU2002352199A1 (en) 2003-06-17
WO2003048696A1 (fr) 2003-06-12
DE10159394A1 (de) 2003-06-12
US7009408B2 (en) 2006-03-07
US20050062483A1 (en) 2005-03-24

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