WO2016202533A1 - Procédé et dispositif de détermination du niveau de remplissage d'un produit de remplissage dans un récipient - Google Patents

Procédé et dispositif de détermination du niveau de remplissage d'un produit de remplissage dans un récipient Download PDF

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Publication number
WO2016202533A1
WO2016202533A1 PCT/EP2016/061584 EP2016061584W WO2016202533A1 WO 2016202533 A1 WO2016202533 A1 WO 2016202533A1 EP 2016061584 W EP2016061584 W EP 2016061584W WO 2016202533 A1 WO2016202533 A1 WO 2016202533A1
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WO
WIPO (PCT)
Prior art keywords
signal
pulse
signal pulse
modulation
unit
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/EP2016/061584
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German (de)
English (en)
Inventor
Christian Seiler
Jörg Füglistaller
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 WO2016202533A1 publication Critical patent/WO2016202533A1/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
    • 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
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers

Definitions

  • the invention relates to a method for determining the filling level of a filling material located in a container by measuring the transit time of microwave signals, as well as a device suitable for carrying out the method.
  • field devices are often used which serve to detect and / or influence process variables.
  • sensors are used, for example, in level gauges, flowmeters, pressure and pressure gauges
  • Temperature measuring devices, pH redox potential measuring devices, conductivity meters, etc. are integrated, which record the corresponding process variables level, flow, pressure, temperature, pH, redox potential or conductivity.
  • Actuators such as valves or valves, are used to influence process variables
  • field devices are all devices that are used close to the process and that supply or process process-relevant information.
  • field devices therefore also include remote I / Os, radio adapters or generally electronic ones
  • Understood components that are arranged at the field level are manufactured and sold by the company Endress + Hauser.
  • Non-contact measuring methods have been established for measuring the filling level, since they are robust and require little maintenance. Another advantage is the ability to measure steplessly.
  • radar-based measuring methods which are based on the transit time principle, have prevailed here.
  • these measuring methods also known as pulse radar, short microwave pulses are periodically applied at a predetermined repetition rate, e.g. in the order of 1 to 2 MHz with natural frequencies in the gigahertz range in the direction of the medium.
  • pulse radar-based level measuring devices such as the FMR20 series, this is done with a repetition frequency of approx. 7 MHz. Their in the direction of sending and
  • Receiving device back reflected signal components are then received after a dependent of the distance covered in the container travel time.
  • an auxiliary signal is derived on the basis of the received signal regularly, that in the
  • Reception signal contained amplitude and phase information of the received signal as a function of the associated running time.
  • the resulting signal which is often referred to as an intermediate frequency signal, is generated on account of the high signal frequencies and, as a rule, very short propagation times or transit time differences to be resolved. It is a time-stretched image of the received signal.
  • a corresponding method is described, for example, in EP 1 324 067 A2.
  • the resulting signal is conventionally subsequently rectified and fed via a low-pass filter and an analog-to-digital converter to an evaluation unit.
  • the duration of the microwave pulses is determined on the basis of the resulting signal.
  • the received signal Since the amplitude of the received signals decreases with the square of the traveled distance, the received signal can have very different amplitudes. In order to be able to measure the measurement signal in spite of the strong level fluctuations, the resulting signal generally has to be standardized by a logarithmic unit.
  • the circuit complexity in the evaluation of the resulting signal is thereby significant. Especially the logarithmization is associated with high circuit complexity. This requires a comparatively complex circuit architecture of the evaluation circuit. Especially from a cost point of view, it is therefore desirable to be able to dispense with such a complex circuit architecture without sacrificing reliability or measuring accuracy.
  • the publication DE 10 2007 058 287 A1 describes a time-equivalent scanning radar whose transmission power is controlled as a function of a sampling time in order to equalize the intensity of the time-extended received signal.
  • Publication JP 002010281643 A shows a pulse-radar system in which the pulse width of the transmission signal is controlled as a function of the distance in order to adjust the amplification of the received signal.
  • Level gauge shown in which the pulse width of the transmission signal is set depending on a variety of parameters, such as the type and surface of the contents, tank height and other tank-specific properties.
  • a pulse radar-based level gauge in which the received signal in
  • the invention is therefore based on the object to propose a radar-based method for level measurement, through which a low circuit complexity of the evaluation circuit is achieved, and a suitable for this purpose
  • the invention solves this problem by a method for determining the level of a filling material located in a container by measuring the duration of
  • Microwave signals the method comprising the following steps:
  • An electrical transmission signal pulse is triggered at a first repetition frequency, the transmission signal pulse having a natural frequency suitable for generating a microwave signal,
  • an electrical reference signal pulse is triggered
  • the time difference between the triggering of the transmit signal pulse and the triggering of the reference signal pulse is determined
  • the transmit signal pulse is modulated, the modulation depending on the
  • the microwave signal is generated, an echo signal, which by reflection of the microwave signal at the
  • the echo signal is converted into an electrical received signal
  • the received signal is sampled by the reference signal pulse such that a resulting signal is formed
  • the runtime is determined by means of the resulting signal
  • the level is determined.
  • the received signal is additionally modulated, wherein the modulation is dependent on the time difference between the triggering of the transmission signal pulse and the triggering of the reference signal pulse.
  • the object is further achieved by a method for determining the level of a filling material located in a container by measuring the duration of
  • Microwave signals comprising the following steps:
  • An electrical transmission signal pulse is triggered at a first repetition frequency, the transmission signal pulse having a natural frequency suitable for generating a microwave signal,
  • a time difference between the triggering of the transmission signal pulse and the triggering of the reference signal pulse is determined
  • the echo signal is converted into an electrical received signal, the received signal is modulated, the modulation being dependent on the time difference,
  • the received electrical signal is sampled by the reference signal pulse such that a resulting signal is formed
  • the runtime is determined by means of the resulting signal
  • the level is determined.
  • An advantageous embodiment of all previously described method provides that for the modulation of the transmit signal pulse and / or for the modulation of the
  • Receiving signal, a signal amplification and / or a pulse width modulation can be used / is. Both types of modulation affect the signal power of either the transmit signal pulse or the receive signal, which can each be used to adjust the amplitude of the resulting signal. It goes without saying even that any other form of modulation can be used that can affect the signal power.
  • the amplification factor increases with increasing
  • This type of control causes those received signals, which are caused by lower levels and thus have a weaker amplitude, to be amplified higher.
  • the pulse width is increased with increasing time difference. Also, this type of control has the same effect, namely a higher gain of those received signals, which have a weaker amplitude due to low levels.
  • Received signal by cross-correlation performed by the reference signal pulse wherein the reference signal pulse has the natural frequency of the transmit signal pulse.
  • the object of the invention is achieved by a device for determining the filling level of a filling material in a container, wherein the device uses at least one of the methods described above.
  • the device comprises:
  • a reference signal generation unit for generating a reference electrical signal pulse
  • a transmitting / receiving unit for emitting a generated by the transmission signal pulse microwave signal in the direction of the contents
  • At least one modulation unit for modulating the electrical signal pulse and / or the received signal
  • a sampling unit for sampling the received signal by means of the reference signal pulse, a control / evaluation unit for determining a duration based on the
  • the inventive idea also contributes to the fact that the manufacturing costs of the device for level measurement can be reduced.
  • the intelligent unit and the control / evaluation unit are an integral part of a common circuit unit. As a result, the space required and the energy consumption of the device are reduced with appropriate design.
  • the modulation unit of the device is an amplifier circuit and / or a pulse width modulator. Both types of modulation affect the signal power of the transmit signal pulse or the
  • the amplitude of the resulting signal can be adjusted so that it is approximately constant even with highly fluctuating levels.
  • the sampling unit of the device is a mixer which performs a cross-correlation of the received signal by means of the reference signal pulse.
  • Fig. 1 Device for determining the level of a filling material located in a container.
  • a device for determining the level L of a filling 1 located in a container 2 is shown.
  • the device is based on measuring the transit time t between emitting a microwave signal S and receiving a through the Surface of the medium 2 generated echo signal E.
  • the microwave signal S is generated by a signal generating unit 3, in which with a repetition frequency f c, an electrical transmission signal pulse s is generated.
  • the signal generating unit 3 comprises a pulse generator for generating the electrical transmission signal pulses s, which have a periodicity corresponding to f c .
  • a high-frequency oscillator is controlled, which has a natural frequency f H F.
  • the periodically high-frequency electrical transmission signal pulses s are generated, wherein the length of the respective pulse is predetermined by the pulse generator.
  • the transmission signal pulse s is fed to a transmission / reception unit 5. This is constructed in two parts in the illustrated embodiment and consists of a
  • the antenna is designed as a horn antenna and generates accordingly a freely radiating microwave signal S. According to the invention, however, it can just as well be a guided radar.
  • the horn antenna also receives the echo signal E and converts it into an electrical reception signal e. Alternatively, this can also be done by a separate receiving antenna.
  • the core of the invention is that either the transmission signal pulse s or the received signal e, or both are modulated by a respective modulating unit 6.
  • Fig. 1 it is stated that both the transmit signal pulse s and the received signal e are modulated.
  • the representation shown is a signal amplification with a gain factor a.
  • the magnitude of the amplification factor a is dependent on the time difference ⁇ between the triggering of the transmission signal pulse s and the triggering of a reference signal pulse s'.
  • the time difference ⁇ is detected by the intelligent unit 7 in the exemplary embodiment shown.
  • the intelligent unit 7 simultaneously controls the amplification factor a.
  • the control is designed such that the amplification factor a of the
  • Time difference ⁇ is also dependent on which received signals e are further processed by the sampling to form a resulting signal ZF. With very small time differences ⁇ , those received signals e are not suppressed by the sampling, which results from near distance, ie high fill levels L. In parallel, those receiving signals e are not suppressed by the sampling at large time differences .DELTA. ⁇ , which are reflected back from further distance, ie low levels L back.
  • sampling signal s' for sampling the received signal e.
  • the sample signal s' must in this case have a second repetition frequency f c , slightly from the first
  • the signal form of the sampling pulse s' is not predetermined.
  • the scanning signal s may be a Dirac pulse, which is generated at a reference frequency f c .
  • the sampling signal s must have the same characteristic as that of the transmission signal pulse s.
  • a reference signal generating unit 4 generates a reference signal pulse s' having these characteristics. Therefore, the reference signal generating unit 4, like the signal generating unit 3, has a pulse generator for generating electric power
  • Pulses of the periodicity f c and a high-frequency oscillator with a natural frequency of f HF Pulses of the periodicity f c and a high-frequency oscillator with a natural frequency of f HF .
  • the scanning is, as shown in Fig. 1, performed by a mixer 8, wherein the sampling is carried out by the mixer 8 by means of cross-correlation.
  • the resulting signal ZF is formed.
  • the type of control of the amplification factor a according to the invention has the consequence that those resulting signals ZF, which are generated by low fill levels L, are amplified more strongly than those resulting signals ZF, which arise at high fill levels. As a result, all resulting signals ZF, regardless of whether resulting from low or high levels L, an approximately equal amplitude. It is thus the weaker reflection of the echo signal E at long distances, so low levels L compensated.
  • the resulting signal ZF can thereby be evaluated without expensive filtering or logarithmization.
  • the fill level L is determined. This is done in the representation shown in Fig. 1 by the control / evaluation unit. 9 LIST OF REFERENCE NUMBERS

Landscapes

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

Abstract

L'invention concerne un procédé de détermination du niveau de remplissage (L) d'un produit de remplissage (2), se trouvant dans un récipient (1), par mesure du temps de propagation (t) de signaux micro-ondes ainsi qu'un dispositif approprié à la mise en œuvre de ce procédé. Le procédé est caractérisé en ce que l'impulsion de signal d'émission (s) ou le signal de réception (e) est modulé, de préférence par une amplification de signal ou une modulation de largeur d'impulsion. La modulation dépend de la différence de temps (ΔT) entre le déclenchement de l'impulsion de signal d'émission (s) et le déclenchement d'une impulsion de signal de référence (s'). La modulation selon l'invention a pour effet que le signal résultant (ZF) destiné à déterminer le niveau de remplissage a une amplitude sensiblement constante même en cas de niveaux de remplissage (L) très différents. Ceci permet l'évaluation du signal résultant et la détermination résultante du niveau de remplissage (L) en réduisant la complexité en termes de la technique de circuit. Cela permet de faire une économie de coût de fabrication du dispositif.
PCT/EP2016/061584 2015-06-15 2016-05-23 Procédé et dispositif de détermination du niveau de remplissage d'un produit de remplissage dans un récipient Ceased WO2016202533A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015109480.0 2015-06-15
DE102015109480.0A DE102015109480B3 (de) 2015-06-15 2015-06-15 Verfahren und Vorrichtung zur Bestimmung des Füllstandes eines in einem Behälter befindlichen Füllgutes

Publications (1)

Publication Number Publication Date
WO2016202533A1 true WO2016202533A1 (fr) 2016-12-22

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DE (1) DE102015109480B3 (fr)
WO (1) WO2016202533A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110520698A (zh) * 2017-05-02 2019-11-29 恩德莱斯和豪瑟尔欧洲两合公司 用于确定和/或监视填充水平的方法
WO2020064218A1 (fr) * 2018-09-24 2020-04-02 Endress+Hauser SE+Co. KG Appareil de mesure de niveau de remplissage
WO2020088830A1 (fr) * 2018-10-30 2020-05-07 Endress+Hauser SE+Co. KG Appareil de mesure de niveau de remplissage

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10051297A1 (de) * 2000-10-17 2002-04-25 Endress Hauser Gmbh Co Füllstandsmeßgerät
US6466168B1 (en) * 2000-08-17 2002-10-15 Mcewen Technologies, Llc Differential time of flight measurement system
EP1324067A2 (fr) 2001-12-28 2003-07-02 VEGA Grieshaber KG Procédé et circuit pour la mesure de la distance d'un objet
DE102007058287A1 (de) 2006-12-08 2008-06-12 Fuji Jukogyo Kabushiki Kaisha Zeitäquivalentes Abtastradar
US20090033543A1 (en) 2007-07-31 2009-02-05 Valter Nilsson Radar level gauge with variable pulse parameters
JP2010281643A (ja) 2009-06-03 2010-12-16 Fuji Heavy Ind Ltd パルスレーダ装置
DE102010027962A1 (de) * 2010-04-20 2011-10-20 Endress + Hauser Gmbh + Co. Kg Füllstandsmessgerät
US20120036927A1 (en) 2010-08-10 2012-02-16 Don Patrick Sanders Redundant level measuring system
EP2677339A1 (fr) * 2012-06-18 2013-12-25 Rosemount Tank Radar AB Système de jauge de niveau pulsé avec commande d'émetteur-récepteur adaptatif
WO2015000068A1 (fr) 2013-07-04 2015-01-08 Titan Logix Corp. Jauge de fluide à détection de niveau faible

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6466168B1 (en) * 2000-08-17 2002-10-15 Mcewen Technologies, Llc Differential time of flight measurement system
DE10051297A1 (de) * 2000-10-17 2002-04-25 Endress Hauser Gmbh Co Füllstandsmeßgerät
EP1324067A2 (fr) 2001-12-28 2003-07-02 VEGA Grieshaber KG Procédé et circuit pour la mesure de la distance d'un objet
DE102007058287A1 (de) 2006-12-08 2008-06-12 Fuji Jukogyo Kabushiki Kaisha Zeitäquivalentes Abtastradar
US20090033543A1 (en) 2007-07-31 2009-02-05 Valter Nilsson Radar level gauge with variable pulse parameters
JP2010281643A (ja) 2009-06-03 2010-12-16 Fuji Heavy Ind Ltd パルスレーダ装置
DE102010027962A1 (de) * 2010-04-20 2011-10-20 Endress + Hauser Gmbh + Co. Kg Füllstandsmessgerät
US20120036927A1 (en) 2010-08-10 2012-02-16 Don Patrick Sanders Redundant level measuring system
EP2677339A1 (fr) * 2012-06-18 2013-12-25 Rosemount Tank Radar AB Système de jauge de niveau pulsé avec commande d'émetteur-récepteur adaptatif
WO2015000068A1 (fr) 2013-07-04 2015-01-08 Titan Logix Corp. Jauge de fluide à détection de niveau faible

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110520698A (zh) * 2017-05-02 2019-11-29 恩德莱斯和豪瑟尔欧洲两合公司 用于确定和/或监视填充水平的方法
CN110520698B (zh) * 2017-05-02 2021-03-12 恩德莱斯和豪瑟尔欧洲两合公司 用于确定和/或监视填充水平的方法
US11486754B2 (en) 2017-05-02 2022-11-01 Endress+Hauser SE+Co. KG Method for determining and/or monitoring the fill level
WO2020064218A1 (fr) * 2018-09-24 2020-04-02 Endress+Hauser SE+Co. KG Appareil de mesure de niveau de remplissage
US11946789B2 (en) 2018-09-24 2024-04-02 Endress+Hauser SE+Co. KG Fill level measuring device
WO2020088830A1 (fr) * 2018-10-30 2020-05-07 Endress+Hauser SE+Co. KG Appareil de mesure de niveau de remplissage
US12366475B2 (en) 2018-10-30 2025-07-22 Endress+Hauser SE+Co. KG Fill level measurement device

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