EP2331917A1 - Appareil de mesure de niveau fonctionnant à micro-ondes - Google Patents

Appareil de mesure de niveau fonctionnant à micro-ondes

Info

Publication number
EP2331917A1
EP2331917A1 EP09781721A EP09781721A EP2331917A1 EP 2331917 A1 EP2331917 A1 EP 2331917A1 EP 09781721 A EP09781721 A EP 09781721A EP 09781721 A EP09781721 A EP 09781721A EP 2331917 A1 EP2331917 A1 EP 2331917A1
Authority
EP
European Patent Office
Prior art keywords
antenna
antennas
receiving
transmitting
signals
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Withdrawn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
EP09781721A
Other languages
German (de)
English (en)
Inventor
Peter KLÖFER
Winfried Mayer
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 EP2331917A1 publication Critical patent/EP2331917A1/fr
Withdrawn legal-status Critical Current

Links

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

Definitions

  • the invention relates to a working according to the transit time Füilstandsmess réelle for level measurement of in-container products, sent with the signal paths on different signal microwave signals into the container and their associated on the
  • Such non-contact meters are used in a variety of industries, e.g. in the processing industry, in chemistry or in the food industry.
  • the level gauge is mounted above the medium and its antenna aligned with the contents.
  • the frequency of the received echo signal therefore has a frequency difference which differs from the instantaneous frequency which the transmission signal has at the time of reception Microwave signal and its echo signal depends.
  • the frequency difference between the transmitted signal and the received signal which can be obtained by mixing both signals and evaluating the Fourier spectrum of the mixed signal, thus corresponds to the distance of the reflecting surface from the antenna.
  • the amplitudes of the spectral lines of the frequency spectrum obtained by Fourier transformation correspond to the echo amplitudes. This Fourier spectrum therefore represents the echo function in this case,
  • At least one useful echo is determined from the echo function, which corresponds to the reflection of the transmission signal at the product surface. From the duration of the useful echo results in a known propagation speed of the microwaves directly the distance that the microwaves (your way from the measuring instrument to the full product surface and back again) Based on the installation height of the fullness measuring instrument above the container, the required level can be calculated directly
  • a Fuilstandsmessgerat can be equipped with several arranged at different locations on the product antennas that are switched individually, for example, arranged in the field electronic switches
  • the use of multiple switchable via electronic switch antennas is less expensive, but has the Disadvantage that this usually directly to the antenna in the field arranged switches must be supplied with energy This is not only expensive, but is esp in applications in which for reasons of explosion protection special security must be complied with a security risk
  • the echo signals of the individual transmission lobes are recorded and, for example, the transmission signals are transmitted in a plurality of transmission lobes with different orientation Based on the known orientation of the different emission lobes obtained additional information, based on which the echoes contained in all echo signals can be determined much more accurate and reliable Examples thereof are described in EP 1 431 724 A1 There is described among other things, the useful echo on the basis of the amplitudes of Whereas the amplitude of the useful echo is equal in all echo signals in terms of angle, the storechos in the different echo signals have different amplitudes due to the different alignment of the associated transmitting lobes
  • the invention consists in a working with microwaves on the runtime principle Fullstandsmessgerat for Fulistands horr of in-container products, with
  • the plurality of frequency-selective elements each having one of the different useful frequencies, in particular bandpass fifters, - In the over the antennas and the frequency-selective elements for each of the different micro Wehensignaie and its echo signal is a uniquely assigned signal path pretending that this Mikrowellensigna! sent to the container and its back to the antenna array reflected echo signal and the meter electronics is supplied, and
  • a device provided in the measuring device electronics, which assigns the consecutively incoming echo signals to the associated signal path.
  • the invention consists in a level gauge in which
  • one of the antennas is a transmitting antenna serving to transmit the different microwave signals into the container
  • the other antennas are receiving antennas, which serve to reflected by reflections in the container back to the antenna array echo signals of the different
  • Receive antenna received signal received to filter the useful frequency having echo signal out
  • the device assigns the successively transmitted from the antenna assembly to the meter electronics echo signals of the receiving antenna from which they were received.
  • the invention consists in a level gauge in which
  • One of the antennas is a receiving antenna, which serves to receive the reflections reflected in the container back to the antenna arrangement echo signals of the different microwave signals,
  • the remaining antennas are transmitting antennas which serve to send one of the different microwave signals into the container,
  • each transmitting antenna a for a frequency-selective element permeable to the different useful frequencies, in particular a band-pass filter, which serves to filter out from the microwave signals generated by the microwave generator that which is transmitted in the measurement mode via the respective transmitting antenna, and
  • the device assigns the successively transmitted from the antenna array to the meter electronics echo signals of the respective transmitting antenna, from which the associated MikroweJIensignale has been sent.
  • the invention consists in a level measuring device in which
  • the antennas are transmitting and receiving antennas which serve to transmit the different microwave signals into the container and to receive their echosigna reflected back to the antenna arrangement by reflections in the container,
  • each transmitting and receiving antenna for one of the different useful frequencies permeable frequency-selective element, esp.
  • a bandpass filter is assigned, which serves to from the from
  • Microwave generator generated the antenna array supplied microwave signals to filter out the one and the transmitting and receiving antenna, which via this
  • Transmitting and receiving antenna is sent, and which serves to filter out of the received from this transmitting and receiving antenna received signal, the associated this useful frequency having echo signal, and
  • the device assigns the successively transmitted from the antenna array to the meter electronics echo signals of the transmitting and receiving antenna over which the associated microwave signal was sent and its echo signal was received.
  • the measuring device electronics are connected to the antenna arrangement exclusively via a single waveguide,
  • the measuring device electronics are connected to the antenna arrangement via a transmitting conductor, via which the transmitting antennas are fed with the different microwave signals, and the measuring device electronics are connected to the antenna arrangement via a receiving waveguide via which the echo signals are transmitted from the antenna arrangement to the measuring device electronics.
  • the receiving antennas are arranged in a group spatially adjacent to each other, and
  • the transmitting antenna is spatially located outside the group.
  • the transmitting antennas are arranged in a group spatially adjacent to one another, and
  • the receiving antenna is spatially located outside of the group.
  • the receiving antennas surround the transmitting antenna spatially,
  • the transmitting antenna is aligned with the contents in the container
  • the receiving antennas each have an orientation which is inclined with respect to the orientation of the transmitting antenna, and the receiving areas of the individual receiving antennas which are predetermined by the orientations of the receiving antennas and which are covered by the respective receiving antenna partially overlap.
  • the transmitting antennas surround the receiving antenna spatially
  • the receiving antenna is aligned with the contents in the container
  • the transmitting antennas each have an orientation which is inclined with respect to the orientation of the receiving antenna
  • Transmission areas of the individual transmission antennas are at least partially in the reception area of the reception antenna and partly overlap.
  • the fill level measuring devices according to the invention have the advantage that, due to the arrangement of the antennas in the antenna arrangement, their integration into the transmitting antenna a! S
  • Receiving antenna or as transmitting and receiving antenna and the frequency-selective elements for each of the different microwave signals and the echo signal is a unique defined exclusively by passive components signal path is clearly specified.
  • the passive components do not require any power supply. Electronic switches or other active power supply requiring components are therefore no longer needed.
  • the assignment of the obtained measurement results to the individual signal paths is thus automatically given over the useful frequency of both the respective transmitted microwave signal and the associated echo signal.
  • the individual echo signals arrive one after the other in the measuring device electronics and can there be processed and evaluated separately in knowledge of the associated signal path in one and the same signal processing.
  • FIG. 1 shows a filling level measuring device according to the invention with a measuring device electronics and a frequency-selective antenna arrangement connected thereto via a single micro-conductor and having a transmitting antenna and a plurality of receiving antennas;
  • Fig. 2 shows an inventive level measuring device with a
  • Fig. 3 shows an inventive level measuring device in which the
  • Antenna arrangement comprises a plurality of transmitting and receiving antennas
  • FIG. 4 shows a fill level measuring device according to the invention with a measuring device electronics and a frequency-selective one connected thereto via a single microwave conductor Antenna arrangement comprising a receiving antenna and a plurality of transmitting antennas, and
  • Fig. 5 shows a erfuldonneudge Fulistandsmessgerat with a meter electronics and connected thereto via a transmitting conductor and a receiving conductor frequency-selective antenna arrangement with a receiving antenna and a plurality of transmitting antennas
  • FIG. 1 shows a schematic diagram of a first variant of the filling level measuring device according to the invention
  • the level gauge 1 is a working with microwaves on the transit time principle Fulistandsmessgerat, eg an FMCW radar level gauge or a pulse radar Fulistandsmessgerat and is used for level measurement of contained in containers 3 filling 5. It includes a Messgeratelektronik 7, which has a microwave generator 9, the successive generation of at least two different useful frequencies f m , f n having
  • Mikroweilensignalen SM S N is microwave generators 9, as can be used in level gauges are known from the prior art.
  • the generation of the different useful frequencies f m , f n having microwave signals S M , S N can be effected for example by a corresponding control of digitally controllable electronic tuning elements of the microwave generator 9, in modern microwave generators 9, such.
  • B in direct digital synthesizers (DDS) or voltage-controlled oscillators (VCO), are provided regularly anyway.
  • the Nutzfrequenzeingna then takes place for example via a varactor used in a resonant circuit of a transmission oscillator.
  • a synthesizer structure may be used in the transmit oscillator, and the pay frequency modifier may be made by changing values of an adjustable frequency divider.
  • a direct digital synthesizer with variable output frequency can be used, or the useful frequencies can be effected by the targeted adjustment of the operating points of active components of a transmission oscillator
  • meter electronics 7 To the meter electronics 7 according to the invention is a frequency-selective passive
  • the antenna arrangement 11 has a number of antennas which serve to successively transmit the different microwave signals S M , S N into the container 3, and to receive the echo signals E M , E N to which they are reflected back to the antenna arrangement 11
  • the antenna arrangement illustrated in FIG For this purpose, 11a comprises a transmitting antenna 13, which serves to transmit the different microwave signals SM, S N into the container 1, and a plurality of receiving antennas 15, 17, which serve to return the echo signals E M , E N of the different reflected back to the antenna arrangement 11a To receive microwave signals S M , S N.
  • the antenna arrangements 11 have a plurality of each one of the different wanted frequencies f m, f n permeable frequency selective Eiemente F M, FN, in particular, band pass filter, at.
  • the essence of the invention is that in the antenna assembly 11 via the antennas and the frequency-selective elements F Ml F N for each of the different microwave signals S M , S N and its echo signal E M , EN a uniquely assigned signal path is given over this Microwave signal S M , S N sent into the container 3 and the antenna array 11 back reflected echo signal E M , EN received and the meter electronics 7 is supplied.
  • this frequency selectivity of the antenna arrangement 11 an unambiguous assignment of the consecutively transmitted microwave signals SM, S N and their associated successively in the memory is obtained via the different useful frequencies f m , f n
  • Meter electronics 7 incoming echo signals E M , EN given to the associated signal path.
  • each receiving antenna 15, 17 has a frequency-selective element F M , F N , änsb which is permeable to one of the different useful frequencies f m , f n .
  • a band-pass filter is connected downstream, which serves to filter out the echo signal Ey, E N having this useful frequency f m , f n , from the received signals received by the respective receiving antenna 15, 17.
  • the microwave generator 9 successively generates two different microwave signals S M , S N , which are transmitted via the transmitting antenna 13.
  • two receiving antennas 15, 17 are provided accordingly. From the reception signal of the reception antenna 15, the frequency-selective element F M connected downstream of the reception antenna 15 is filtered out for the echo signal E M associated with the micro-presence signal S M. From the received signal of the receiving antenna 17, the frequency response to the receiving antenna 17 downstream frequency selective element F M to Mikroweilensignai S N associated echo signal E N is filtered out.
  • the measuring device electronics 7 comprises a device 21 which assigns the incoming echo signals E M , E N based on their different useful frequencies f m , f n to the respective receiving antennas 15, 17 or to the signal path extending over these receiving antennas 15, 17.
  • the device 21 comprises, for example, a memory connected to a signal processor 23, in which this assignment is stored.
  • the microwave generator 9 Since the microwave generator 9 successively generates the individual different microwave signals S M , S N , and these are sent successively, the useful frequencies f m , f n of the echo signals E M , E N need not be measured. As long as the microwave generator 9 generates the micro dimming signal S M , the receiving antennas 15, 17 exclusively receive its echo signal EM. The pertinent echo signal E M reflected back by reflection in the container 3 to the antenna arrangement 11a is indeed of both Reception antennas 15, 17 received, but this can happen only for its useful frequency f m permeable to the receiving antenna 15 downstream frequency-selective element F M.
  • the individual successive incoming echo signals E M , E N from the signal processing are used to determine the filling level 23 processed by, for example, based on the echo signals E M , EN an echo function is derived, which reproduces the received Signaiamplitude as a function of Signalzeitaufzeit
  • the known from the prior art both Pulse Radar Fullstandsmessgerate and FMCW Radar Fullstandsmessgerat be used
  • the invention Fullstandsmessgerat in this case has the advantage that the relevant for the transit time determination of the respective echo signal E M , E N sent sent sent sent.
  • Microwave signal S M , S N in the meter electronics 7 via the microwave generator 9 of the signal processing 23 is always time correct available
  • the measuring device electron 7 is connected to the antenna arrangement 11 exclusively via the single waveguide 19. This is via a transmitting-receiving separation 25, eg a circulator or a directional coupler, both to the transmitting antenna
  • FIG. 2 shows a second variant of the inventive Fullstandsmessgerats in contrast to the variant shown in Figure 1, the Messgeratelektronik 7 here via two microwave conductors, namely a transmitting conductor 27 and a receiving conductor 29 to the antenna assembly 1 1 b connected.
  • the transmission conductor 27 leads from the microwave generator 9 of the measuring device electronics 7 to the transmitting antenna 13.
  • the transmitting antenna 13 is fed with the microwave signals S M> S N via them.
  • the echo signals E M , E N filtered out of the received signals of the receiving antennas 15, 17 are fed to the measuring device electronics 7.
  • all receiving antennas 15, 17 are connected to the second Empfangsieiter 29, which in turn is connected to the meter electronics 7.
  • the Sendieiter 27 and the receiving conductor 29 permanent connections that unlike electronic switches cause no change and / or impairment of signal transmission.
  • no transmitting / receiving separation 25 is required in the antenna arrangement 1 1b shown in FIG.
  • FIG. 3 shows a third variant of the level gauge according to the invention, which has the measuring device electronics 7 already explained with reference to FIGS. 1 and 2 and a frequency-selective passive antenna arrangement 11c connected thereto.
  • the antenna arrangement 11c has transmission and reception
  • Receiving antennas 31, 33, 35 ie each of the antennas serves both as a transmitting antenna and as a receiving antenna.
  • Each of these transmit and receive antennas 31, 33, 35 is each assigned a frequency-selective element F M , F N , F L which is permeable to one of the different useful frequencies f m , f n ,,, and which respectively serves for this purpose from the different successive microweighing generators 9 generated the antenna array 11 c supplied microwave signals SM; SN; SL, the respective useful frequency f m , f n , f ⁇ having microwave signal S M ; S N ; S L out, which is then sent in each case exclusively via the associated transmitting and receiving antenna 31, 33 and 35 in the container 3.
  • the respective frequency-selective element F M , F N , F L is used, from the recorded with the respective transmitting and receiving antenna 31, 33, 35 received signal, the associated this useful frequency f m , f n . f ⁇ having echo signal E M ; E N ; To filter out e l .
  • the Mikroweliengenerator 9 generates three different microwave signals SM; SN; SL- cause the frequency-selective elements F M , F N , F L that the microwave signal S M is sent exclusively via the transmitting and receiving antenna 31 and filtered out of the received signal exclusively the associated echo signal E M and to
  • the antenna arrangement 11c is also connected exclusively via the single microwave conductor 19 to the measuring device electronics 7, via which the antenna arrangement 11c is supplied with the microwave signals S M , S N , SL, and via which the echo signals E M , E N , E L associated with the received signals of the transmitting and receiving antennas 31, 33, 35 are supplied to the measuring device electronics 7 become
  • the microwave conductor 19 is connected in parallel via the transmitting and receiving separation 25 to the three frequency-selective elements F M , F N , F L , which in turn are connected to the transmission elements assigned to the respective element F M , F N , F L. and receiving antenna 31, 33, 35 are connected
  • FIGS. 4 and 5 show two further full-range measuring devices according to the invention, each having a frequency-selective antenna arrangement 1 1d, 11e connected to the measuring device electronics 7 in contrast to the exemplary embodiments described above, these antenna arrangements 11d, 11e have only one receiving antenna 37 and several transmitting antennas 39, 41
  • Each of the transmitting antennas 39, 41 serves to transmit one of the different micro-woke signals S M , S N into the container 3, and the receiving antenna 37 serves for this purpose the echo signals E M reflected back by reflections in the container 3 to the antenna arrangement 11d, 11e
  • E N of the different microwave signals S M , S N to receive each transmit antenna 39, 41 is one for one of the different useful frequencies f m , f n permeable frequency-selective element F M , F N , esp a bandpass filter, upstream, which serves from the micro-wave signals S M , S N d generated by the microwave generator 9 To filter out as that is sent in Messbet ⁇ eb on the respective transmit
  • the measuring device electronics 7 can either be connected via a single microwave conductor 19 to the antenna arrangement 11d, as shown in FIG. 4, via which the antenna arrangement 11d is supplied with the different micro-cavity signals SM, S N , and via which the associated antenna arrangement 11 d received echo signals e M> e N of Messgeratelektronik are supplied to 7 in the case of the microwave conductor 19 is connected analogous to that shown in Figure 1 example, via the transmitter-receiver separation 25 to the transmitting antennas 39, 41 and to the receiving antenna 37, the frequency selective elements F M , F N are in this case respectively between the transmitting-receiving separation 25 and the respective transmitting antenna 39, 41 are arranged
  • the measuring device electronics 7 analogous to the exemplary embodiment shown in Figure 2 via a transmission line 27 and a receiving line 29 to be connected to antenna array 11e
  • the transmission line 27 is here in the antenna assembly 11e via the frequency-selective element FM to the transmitting antenna 41 connected and connected via the frequency-selective element F N to the transmitting antenna 39 Due to the upstream frequency-selective elements F M , F N sends the transmitting antenna 41 exclusively the microwave signal S M and the transmitting antenna 39th only the microwave signal! S N. Since the microwave generator 9 successively generates the different microwave signals S M , S N , either one or the other transmitting antenna 39, 41 transmits.
  • the respective currently transmitted microwave signal S M , S N , S L and the associated echo signal E Mt E N , E L are each in pairs at the associated level-dependent run time offset in time to each other in the meter electronics 7 are available, so that the succession of the different measurement quantities obtained by the respective antenna arrangement signal paths, esp.
  • the associated dependent of the signal delay time echo functions of one and the same signal processing 23 can be determined sequentially.
  • the different shegnalwege on which the microwave signals S M , S N , S 1 are sent and associated echo signals E M , E N , E L are received by the positioning of the individual antennas of the antenna assemblies 11 a, 11 b, 11 c, 11 d, 11 e, the Alignment and their use as a transmitting antenna, as a receiving antenna or as a transmitting and receiving antenna within wide limits predetermined.
  • the individual signal paths predetermined by the respective antenna arrangement 11a, 11b, 11c, 11d, 11e via the frequency-selective elements F M , F N , F L are shown by arrows.
  • the antennas of the respective antenna arrangement 11a, 11b, 11c, 11d, 11e can be arranged, for example, next to each other in a row. In the embodiment shown in FIG. 3, this results in parallel orientation of the individual transmitting and receiving antennas 31, 33, 35 on the medium 5 via each of the individual transmitting and receiving antennas 31, 33, 35 respectively the current level at the location of the respective Transmitting and receiving antenna 31, 33, 35.
  • the measuring locations at which filling levels are measured in the course of a multi-point measurement are shown by the marked signal paths, which lead from one of the transmitting antennas 13, 39, 41 to one of the receiving antennas 15, 17, 37.
  • antenna arrangements such as the arrangement 11 b of FIG. 2 are selected in which a plurality of receiving antennas 15, 17 are arranged in a group spatially adjacent to one another, and a transmitting antenna 13 is arranged spatially outside the group, or antenna arrangements, such as the arrangements 11d, 11e are selected in which a plurality of transmitting antennas 39, 41 are arranged in a group spatially adjacent to each other, and a receiving antenna 31 is arranged outside the group.
  • the Individual antennas are preferably aligned depending on their position relative to each other such that the signal efficiency on the individual signal paths is maximaf.
  • Antenna arrangements such as the antenna arrangement 11a of FIG. 1, are preferably selected for carrying out the multi-lobe measurement described above, in which a plurality of receive antennas 15, 17 spatially surround a single transmit antenna 13.
  • the transmitting antenna 13 positioned in the center of the antenna arrangement 11a is preferably aligned directly with the filling material 5 in the container, and the receiving antennas 15, 17 each have an orientation which is inclined relative to the orientation of the transmitting antenna 13 and which is selected such that the light emitted through the Ausrächtitch the receiving antennas 15, 17 predetermined by the respective receiving antenna 15, 17 covered receiving areas at least partially cover the transmission range of the transmitting antenna 13 and the reception areas of the individual receiving antennas 15, 17 partially overlap.
  • an antenna arrangement 11e shown in FIG. 4 with respect to the signal paths, in which the receiving antenna 37 positioned in the center of the antenna arrangement 11d is spatially surrounded by a plurality of transmitting antennas 39, 41.
  • the receiving antenna 37 is preferably aligned directly with the filling material 5, and the transmitting antennas 39, 41 each have an orientation which is inclined relative to the orientation of the receiving antenna 37 and which is selected such that the directions defined by the dimensions of the transmitting antennas 39, 41 Transmission areas of the transmission antennas 39, 41 partially overlap and at least partially lie in the reception area of the reception antenna 37.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne un appareil de mesure de niveau fonctionnant à micro-ondes suivant le principe du temps de propagation, pour la mesure du niveau de matières de remplissage (5) qui se trouvent dans des conteneurs (3),appareil au moyen duquel des signaux micro-ondes (SM, SN, SL) sont émis sur plusieurs trajets de signaux différents, dans le conteneur (3) et dont les signaux d'écho associés (EM, EN, EL) peuvent être reçus; les résultats de mesure obtenus sur les trajets de signaux différents peuvent être évalués séparément les uns des autres, au moyen d'une électronique d'appareil de mesure (7), d'un générateur à micro-ondes (9) pour la production successives de signaux micro-ondes (SM, SN, SL) présentant des fréquences d'utilisation différentes (fm, fn, f1); il est prévu un dispositif d'antennes passif, sélectif en fréquence (11a, 11 b, 11c, 11d, 11e) connecté audit générateur, qui présente plusieurs antennes, lesquelles servent à émettre les signaux micro-ondes différents (SM, SN, SL), successivement, dans le conteneur (3), et à recevoir leurs signaux d'écho (EM, EN, EL) rétroréfléchis sur le dispositif d'antennes (11a, 11b, 11c, 11d, 11e) qui présente plusieurs éléments sélectifs en fréquence (FM, FN, FL) perméables respectivement pour l'une des fréquences d'utilisation différentes (fm , fn, f1 ),en particulier des filtres passe-bande, et dans lequel via les antennes et les éléments sélectifs en fréquence (FM, FN, FL), il est prévu pour chacun des signaux micro-ondes différents (SM, SN, SL) et son signal d'écho (EM, EN, EL), un trajet de signal associé de manière univoque, via lequel ce signal micro-onde est émis dans le conteneur (3) et son signal d'écho (EM, EN, EL) rétroréfléchi sur le dispositif d'antennes (SM, SN, SL) est reçu et est envoyé à l'électronique de l'appareil de mesure (7), un dispositif (21) étant prévu dans l'électronique de l'appareil de mesure (7), dispositif qui attribue les signaux d'écho (EM , EN ) introduits successivement, au trajet de signal associé.
EP09781721A 2008-10-10 2009-08-12 Appareil de mesure de niveau fonctionnant à micro-ondes Withdrawn EP2331917A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810050329 DE102008050329A1 (de) 2008-10-10 2008-10-10 Mit Mikrowellen arbeitendes Füllstandsmessgerät
PCT/EP2009/060404 WO2010040580A1 (fr) 2008-10-10 2009-08-12 Appareil de mesure de niveau fonctionnant à micro-ondes

Publications (1)

Publication Number Publication Date
EP2331917A1 true EP2331917A1 (fr) 2011-06-15

Family

ID=41217715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09781721A Withdrawn EP2331917A1 (fr) 2008-10-10 2009-08-12 Appareil de mesure de niveau fonctionnant à micro-ondes

Country Status (5)

Country Link
US (1) US8884632B2 (fr)
EP (1) EP2331917A1 (fr)
CN (1) CN102177420B (fr)
DE (1) DE102008050329A1 (fr)
WO (1) WO2010040580A1 (fr)

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US8884632B2 (en) 2014-11-11
WO2010040580A1 (fr) 2010-04-15
US20110193567A1 (en) 2011-08-11
CN102177420A (zh) 2011-09-07
CN102177420B (zh) 2013-02-13

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