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1. WO2020108965 - METHOD FOR MEASURING A FILLING LEVEL

Publication Number WO/2020/108965
Publication Date 04.06.2020
International Application No. PCT/EP2019/080797
International Filing Date 11.11.2019
IPC
G01F 23/28 2006.01
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
23Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
22by measurement of 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
28by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
G01F 23/284 2006.01
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
23Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
22by measurement of 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
28by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
284Electromagnetic waves
G01S 7/40 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
7Details of systems according to groups G01S13/, G01S15/, G01S17/127
02of systems according to group G01S13/58
40Means for monitoring or calibrating
CPC
G01F 23/284
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
23Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
22by measurement of 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
28by measuring the variations of parameters of electric or acoustic waves applied directly to the liquid or fluent solid material
284Electromagnetic waves
G01S 7/4056
GPHYSICS
01MEASURING; TESTING
SRADIO 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
7Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
02of systems according to group G01S13/00
40Means for monitoring or calibrating
4052by simulation of echoes
4056specially adapted to FMCW
Applicants
  • ENDRESS+HAUSER SE+CO. KG [DE]/[DE]
Inventors
  • MAYER, Winfried
  • SAUTERMEISTER, Manuel
Agents
  • ANDRES, Angelika
Priority Data
10 2018 130 186.328.11.2018DE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) VERFAHREN ZU FÜLLSTANDSMESSUNG
(EN) METHOD FOR MEASURING A FILLING LEVEL
(FR) PROCÉDÉ DE MESURE DU NIVEAU DE REMPLISSAGE
Abstract
(DE)
Die Erfindung betrifft ein Verfahren zur Radar-basierten Messung eines Füllstandes (L) eines in einem Behälter (2) befindlichen Füllgutes (3). Das Verfahren zeichnet sich durch folgende Verfahrensschritte aus, die zusätzlich zu den bei Radar üblichen Verfahrensschritten in den jeweiligen Messzyklen (m) ausgeführt werden: In den aufeinanderfolgenden Messzyklen (n) werden fortschreitend: Die jeweils aktuelle Auswertungskurve (ZFn) abgespeichert; Eine erste Differenzkurve (Diffn) anhand der Auswertungskurve (ZFn) des aktuellen Messzyklus (n) und einer gespeicherten Auswertungskurve (ZFn-m) eines vorhergehenden Messzyklus (n-m) gebildet; und der Füllstand (L) anhand eines Maximums (Am) in der aktuellen, ersten Differenzkurve (Diffn) bestimmt. Erfindungsgemäß wird der Füllstand also nicht aus der als Zwischenfrequenzsignal bekannten Auswertungskurve (ZF) erstellt, sondern aus der Differenzkurve (Diffn). Hierdurch kann der Füllstand (L) insbesondere bei welligen Füllgut-Oberflächen mit höherer Sicherheit ermittelt werden. Dies trägt dazu bei, den Füllstand (L) insgesamt zuverlässiger bestimmen zu können.
(EN)
The invention relates to a method for radar-based measurement of a filling level (L) of a filling material (3) in a container (2). The method is characterised by the following method steps which are carried out in the relevant measurement cycles (m) in addition to the method steps which are conventional with radar. In the successive measurement cycles (n) the following steps are carried out progressively: the relevant current evaluation curve (ZFn) is stored; a first difference curve (Diffn) is formed on the basis of the evaluation curve (ZFn) of the current measurement cycle (n) and a stored evaluation curve (ZFn-m) of a preceding measurement cycle (n-m); and the filling level (L) is determined on the basis of a maximum (Am) in the current first difference curve (Diffn). According to the invention, the filling level is thus established from the difference curve (Diffn) rather than from the evaluation curve (ZF) known as the intermediate frequency signal. As a result, the filling level (L) can be determined with greater certainty, in particular in the case of filling material having rippled surfaces. This means that the filling level (L) can be determined more reliably overall.
(FR)
L'invention concerne un procédé de mesure basée sur un radar d'un niveau de remplissage (L) d'un produit (3) de remplissage se trouvant dans un contenant (2). Le procédé se caractérise par les étapes de procédé suivantes, qui sont exécutées, en plus des étapes de procédé habituelles pour un radar, dans les cycles de mesure (m) respectifs : dans les cycles de mesure (n) successifs, de manière progressive : la courbe d'évaluation (ZFn) actuelle respective est mise en mémoire ; une première courbe de différence (Diffn) est formée sur la base de la courbe d'évaluation (ZFn) du cycle de mesure (n) actuel et d'une courbe d'évaluation (ZFn-m) mise en mémoire d'un cycle de mesure (n-m) précédent ; et le niveau de remplissage (L) est déterminé sur la base d'un maximum (Am) dans la première courbe de différence (Diffn) actuelle. Selon l'invention, le niveau de remplissage n'est par conséquent pas établi à partir de la courbe d'évaluation (ZF) connue en tant que signal de fréquence intermédiaire, mais à partir de la courbe de différence (Diffn). Ainsi, le niveau de remplissage (L), en particulier lorsque les surfaces du produit de remplissage sont ondulées, peut être déterminé avec une fiabilité accrue. Ceci contribue à pouvoir déterminer le niveau de remplissage (L) de manière plus fiable dans l'ensemble.
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