EP3791171A1 - Dispositif de mesure tdr pour déterminer les constantes diélectriques - Google Patents

Dispositif de mesure tdr pour déterminer les constantes diélectriques

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Publication number
EP3791171A1
EP3791171A1 EP19719246.1A EP19719246A EP3791171A1 EP 3791171 A1 EP3791171 A1 EP 3791171A1 EP 19719246 A EP19719246 A EP 19719246A EP 3791171 A1 EP3791171 A1 EP 3791171A1
Authority
EP
European Patent Office
Prior art keywords
measuring
tdr
medium
pipeline
pipe
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.)
Pending
Application number
EP19719246.1A
Other languages
German (de)
English (en)
Inventor
Timo CAMEK
Gerd GRITSCH
Stefan Rolf
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.)
IMKO Micromodultechnik GmbH
Original Assignee
IMKO Micromodultechnik GmbH
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 IMKO Micromodultechnik GmbH filed Critical IMKO Micromodultechnik GmbH
Publication of EP3791171A1 publication Critical patent/EP3791171A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2617—Measuring dielectric properties, e.g. constants
    • G01R27/2635—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells
    • G01R27/2676—Probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2617—Measuring dielectric properties, e.g. constants
    • G01R27/2635—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells
    • G01R27/2647—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells of coaxial or concentric type, e.g. with the sample in a coaxial line
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2617—Measuring dielectric properties, e.g. constants
    • G01R27/2635—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells
    • G01R27/2658—Cavities, resonators, free space arrangements, reflexion or interference arrangements

Definitions

  • the invention relates to a TDR measuring device for determining the
  • Dielectric constant and / or derived material properties in particular the humidity and / or the conductivity of a medium flowing through a pipe medium.
  • the pipeline can be any conduit capable of carrying a medium. It may therefore be a closed line or even a channel-shaped line.
  • the dielectric TDR measurement principle for determining the moisture content of a medium is used in many industrial applications.
  • the dielectric constant (DK) of a material is measured by a high-frequency electromagnetic field, wherein the electromagnetic high-frequency field penetrates the material to be measured.
  • the dielectric constant of water has a value of 80 at 20 ° C and thus differs greatly from the dielectric constant of solids, which have DK values of 3 to 30, depending on the material. With this strong dielectric contrast, the dielectric constant can thus be used as a measure of the water content or the moisture content of the material.
  • the TDR (Time Domain Reflectometry, also known as cable radar) measuring principle used for DK measurements has become increasingly popular over the last 20 years as a precise measurement method for demanding applications in industry.
  • TDR measurements two- or three-wire parallel waveguides are usually used.
  • the waveguide arrangement corresponds to the actual sensor or the measuring probe. This is in the form of rods or plates in the too
  • a voltage jump or a signal edge is preferably generated, which propagates along a coaxial cable which is connected to the waveguides. If the voltage jump on the waveguide, it comes to a
  • Partial reflection The propagating portion of the measuring signal is completely reflected at the end of the probe.
  • the step response of a waveguide can be over the
  • Measuring time range wherein the reflection time is the measure of the water content or the complete dielectric properties.
  • the propagation velocity c of an electromagnetic wave in vacuum is equal to the speed of light c 0 .
  • Propagation speed c depends only on the dielectric constant and the magnetic permeability pr of the material in which the wave propagates.
  • the latter can be set equal to 1 in non-magnetic materials, so that the propagation speed depends only on the dielectric constant (DK).
  • the challenge with the TDR measurement lies in the very short duration of the electromagnetic wave on the probe. Therefore short-term and steep-edged pulses (rise time ⁇ 300 picoseconds) must be used for the measurement.
  • Products / media via a TDR method have become known from EP 0 478 815 A1.
  • a rectangular signal is applied to a measuring line by means of a measuring signal generator.
  • the pulse duration of the signal here is twice as long as the running time of the signal on the test lead.
  • the signal is reflected on the test lead or at the end of the test lead. Therefore, at the input of the measuring line or at the output of the measuring signal transmitter, the superimposition of the amplitudes of the signal fed to the measuring line forms
  • the measuring line is in this case preferably designed as a probe.
  • the moisture of the medium is determined.
  • the pulse triggered by the signal processing electronics via a cable to the first measuring line, from the end of the first measuring line to the beginning of the second measuring line, is reflected at the end of the second measuring line and runs back to the signal processing electronics.
  • the duration of the pulse is calculated as a humidity value and over standard analog signals, e.g. based on the 0-20mA or the 4-20mA standard.
  • the moisture can also be transmitted via a digital interface, such as a RS 485, are issued.
  • measuring devices are offered under the names Sono-Vario, Sono-Silo, Trime-Pico.
  • the measuring devices each consist of the sensor or the measuring probe and a TDR measuring electronics, each on a circuit board housed in the probe housing or outside the probe housing.
  • the TDR measuring electronics are always on (internally in the probe housing, or externally) via
  • High frequency cable / coaxial cable connected to the sensor or the probe.
  • sensors are offered which vary in length, in particular between 0.05 m and 0.5 m.
  • the known solutions are mainly realized via rod arrangements or via planar sensors; these are either coated or uncoated.
  • the object of the invention is to propose a TDR measuring device which non-invasively measures parameters of the medium flowing through a pipeline and / or recognizes a change in state of the pipeline.
  • the term 'non-invasive' is understood in the context of the invention that the flow of the medium through the measuring device is not hindered or disturbed.
  • the invention is achieved by a TDR measuring device for determining the
  • Dielectric constant and derived material properties in particular the humidity and / or the conductivity of a medium flowing through a pipe medium.
  • the solution according to the invention is also suitable for detecting a change in state of the pipeline through which the medium flows or for detecting the condition of a medium flowing through the pipeline.
  • the TDR measuring device comprises signal generation electronics which generate TDR measurement signals, preferably jump signals as described in EP 0 478 815 A1, a transmitting and / or receiving electronics unit which transmits and / or receives the TDR measurement signals Input / output device, which couples the TDR measuring signals to an electrically conductive measuring probe of a predetermined length or decoupled from the measuring probe, and control / evaluation electronics which, based on the transit time of the TDR measuring signals, the dielectric constant and derived therefrom
  • connection of the electronics to the sensor is preferably via an RF cable.
  • the electronics are either located at the sensor, or they are spatially separated from the sensor, the distance is usually between 1-2m.
  • the measuring probe is preferably outside of the medium through which the medium flows
  • Dielectric constant of the flowing medium through the pipe Dielectric constant of the flowing medium through the pipe.
  • the probe is arranged to be flush with the flowable medium closes facing inner surface of the pipeline. It goes without saying that in this case at least two electrodes carrying the measuring signals must be provided, which are electrically insulated from one another.
  • This alternative positioning of the measuring probe is particularly suitable when measuring the concentration of flowable media with very high dielectric constants, eg sugar solutions for soft drinks. In these applications, an isolation of the probe to the flowable medium would lead to a significantly reduced accuracy of measurement.
  • the dielectric constants of corresponding media are above 50, often between 60-80.
  • the frequency used for the measurement signals is preferably in the range of 500 MHz - 2 GHz.
  • the flowable media can be liquid or viscous.
  • the medium may also be a bulk material or a powdery substance.
  • the TDR measuring device enables non-invasive inline measurement of various physical properties of liquid / viscous media or bulk materials as they flow through a pipeline. Since the measuring probe is arranged outside the flow path of the medium, the medium can flow undisturbed and uninfluenced by the measuring probe through the pipeline.
  • the TDR measuring device also makes it possible to detect changes in the wall of the pipeline through which the medium flows. This information can subsequently be used for compensation purposes or for error status detection. A change of state in the area of the pipeline can e.g. be triggered by fouling.
  • the TDR meter is used for the non-invasive determination of the dielectric constant, permittivity and / or conductivity of the medium flowing through the pipeline.
  • the TDR measuring device according to the invention allows improved accuracy in the determination of moisture or conductivity.
  • the measuring probe consists of at least two preferably designed as interconnects electrodes, wherein a first electrode performs the TDR measurement signals and wherein the at least one further electrode is configured as a shield or ground electrode.
  • sensors for acquiring measured values via the TDR technology each consist of one or two electrically conductive electrodes at ground potential and an electrically conductive electrode into which the high-frequency measurement signal is coupled.
  • the electrodes are guided in parallel and each electrically contacted at one end. At the "open", not electrically contacted end of the
  • the probe is connected to a TDR via a coaxial cable.
  • Measuring electronics (which is usually arranged on a circuit board) connected.
  • the TDR measuring electronics generates the high-frequency signal, measures the running time of the am
  • Probe end reflected signal evaluates the measured data and provides the measurement result.
  • the board can be integrated directly into a sensor housing. It depends, however, on the particular one
  • the dimensioning and / or the design of the measuring probe are configured such that the electromagnetic field generated by the measuring signals at least approximately completely penetrates the interior of the pipeline.
  • the arrangement and configuration of the at least one grounded electrode, the field geometry can be selectively influenced.
  • a first advantageous embodiment of the measuring probe provides that the first electrode and the shield or ground electrode are arranged substantially on or in opposite surface areas of the pipeline.
  • the measuring probe preferably consists of three electrodes designed as conductor tracks, one of the electrodes carrying the TDR measuring signals and being arranged substantially centrally with respect to the two electrodes designed as shielding or grounding electrodes.
  • the electrodes are arranged either on the outer wall of the pipeline or in the pipe wall of the pipeline.
  • the pipe itself is made of an electrically non-conductive material at least in the area in which the measuring probe is located. It is also possible to design the corresponding pipe section with the electrodes as a separate unit, wherein the separate unit in the
  • Pipe is used.
  • the pipe and the separate unit preferably have the same inner pipe diameter.
  • the electrodes are placed with respect to the inner surface of the pipeline such that their outer surface facing the medium terminates flush with the inner surface of the pipeline facing the medium.
  • the electrodes are arranged substantially parallel to one another and spirally with respect to the pipeline.
  • An alternative embodiment provides that the electrodes are arranged parallel to each other in the form of partial circles (see Fig. 4) substantially perpendicular to the flow direction of the flowing medium through the pipe.
  • it must be ensured that the interior of the pipeline in the area of the measuring probe is complete or at least largely interspersed by the electromagnetic field of the measuring signals running along the measuring probe.
  • the degrees of freedom with respect to the length of the electrodes are greater than in the last-mentioned arrangement of the electrodes.
  • the electrodes preferably have the same length, but differ in width.
  • the probe can be optimally adapted to the respective application within wide limits. If the electrodes face each other, the penetration of the interior space with the electromagnetic field of the measuring signals running along the measuring probe over the cross section of the pipeline is guaranteed.
  • the TDR measuring device in such a way that, in addition to determining the dielectric constant of the medium flowing through the pipeline, it also provides information about a change in state of the wall of the pipeline. While the first measuring probe is designed such that the electromagnetic field generated by the measuring signals, that is to say the measuring field, at least approximately completely penetrates the interior of the pipeline, the second is
  • Measuring probe designed so that the generated by the measuring signals
  • the propagation time and / or the attenuation of the measuring signals running along the measuring probe provide information about the dielectric constant of the medium
  • the propagation time and / or the attenuation of the measuring signals in the second measuring probe provide information about one
  • both probes are arranged axially offset from one another on the pipeline.
  • the two measurements can be performed alternately by means of a switch or in parallel.
  • Multisensor arrangement of, for example, three preferably axially offset and differently designed probes before. While a first measuring probe is designed such that the electromagnetic field generated by the measuring signals at least approximately completely passes through the interior of the pipeline, a second measuring probe and a third measuring probe are designed such that the electromagnetic fields generated by the measuring signals in the interior of the pipeline annular areas of different thickness in the region of the wall of the pipeline push through.
  • a configuration of the TDR measuring device makes it possible, for example, to detect whether the medium flows through the pipeline in a laminar manner. In addition, it can also be detected with such a TDR measuring device, whether at a
  • the measuring probe is arranged in a housing acting as a Faraday cage.
  • TDR measuring device suggests that the signal generation electronics, the transmission and / or
  • Receiving electronics, the input / output device and the probe are arranged on a multi-layer, preferably a three-layer printed circuit board.
  • a bore is provided in this embodiment in the circuit board, the so
  • the pipe is approximately flush in the hole can be arranged.
  • the electrodes are arranged in the layer structure of the printed circuit board and relative to the bore in the circuit board, that the guided in the first electrode measuring signals interact with the medium flowing in the pipe medium.
  • the pipeline is a flexible or rigid hose or a measuring capillary which, at least in the region of
  • Passage through the hole consists of a non-conductive material.
  • the measuring probes according to the invention can be equipped with suitable
  • the probes or sensors for integration into other components in e.g. Plugs / couplings or housing, ideally suited.
  • the probes according to the invention can also be integrated into a printed circuit board.
  • the measuring probe according to the invention operates without contact - in this case the electrodes therefore have no direct contact with the medium.
  • the electrodes can be in the wall of the probe - or in an alternative embodiment - in the Integrate board yourself.
  • the IMKS process integrated metal / plastic injection molding
  • the measuring probe can surround the pipeline in which the medium flows.
  • Non-contact or non-invasive probes also have the advantage that they do not affect the flow path of the medium. Pressure losses in the pipeline or turbulence of the medium thus do not occur. Also, the particular installation position in the pipeline does not have to be special
  • the measuring probes according to the invention can be installed in pipe bends.
  • the probe can be installed in pipe bends.
  • the cross section may be round, angular or oval.
  • FIG. 1 shows a schematic representation of a first embodiment of the TDR measuring device according to the invention
  • Fig. 1 shows a schematic representation of a first embodiment of
  • the TDR measuring device for non-contact or non-invasive determination of at least the dielectric constant and possibly derived therefrom properties of the medium flowing through a pipe 1 medium 2 and / or to detect a change in state of the pipe 1, which is traversed by the medium 2.
  • the TDR measuring device consists of a sensor or a measuring probe 6 and a measuring electronics 16. In the case shown, the two
  • the measuring line 14 is preferably a coaxial cable.
  • the electronic components of the measuring electronics 16 are arranged: the signal generating electronics 3, the transmitting and / or receiving electronics 4, the input / Decoupling device 5 and the control / evaluation 7.
  • Signal generating electronics 3 generates the TDR measurement signals
  • the transmitting and / or receiving electronics 4 transmits the TDR measurement signals and / or receives the reflected on the probe TDR measurement signals.
  • the control / evaluation electronics determines at least the dielectric constant and / or the permittivity and, if appropriate, derived properties or parameters of the medium. These medium properties are, in particular, the moisture and / or the conductivity.
  • the TDR measuring device according to the invention is suitable for alternatively or additionally detecting a change in state of the pipeline 1.
  • the state change is caused, for example, by deposits on the inner wall of the pipeline 1.
  • Parent control / display device forwarded.
  • the forwarding can be wired or wireless.
  • the sensors or measuring probes 6 according to the invention differ from the previously known sensors in that they are connected to the pipeline 1, in which the pipeline
  • the measuring probes 6 can be mounted on the outer wall of the pipeline 6, but can also be integrated into the wall of the pipeline 1. Furthermore, the measuring probes 6 can be placed so that the surface of the electrodes 9, 10, 11 which faces into the interior of the pipeline 6 terminates flush with the inner surface of the pipeline 6.
  • Electrodes 9, 10, 1 1 can also be applied to the outer surface of an existing pipeline 1.
  • Fig. 2 shows a first embodiment of the TDR measuring probe 6. In the shown
  • the senor has two electrodes 9, 10, which are arranged in the direction of the longitudinal axis 19 of the pipe 1 on or in the pipeline 1.
  • the pipe 1 - in the context of the invention also commonly referred to as a measuring body - has a be electrical insulator (eg plastic / ceramic ...), otherwise the measuring field can not propagate in the pipe 1 and therefore can not be influenced by the medium 2.
  • the electrodes 9, 10 advantageously have the same length L, but different widths B. By varying the width B and / or the length L of the electrodes 9, 10, the measuring field can be optimally adapted to the respective measuring task.
  • Fig. 3 shows a second embodiment of the TDR measuring probe 6, which is referred to as a spiral sensor or axial spiral.
  • a spiral sensor or axial spiral In the embodiment shown, three electrodes 9, 10,
  • the measuring body 1 must again be made of an electrically insulating material (eg plastic / ceramic ...), at least in the area of the measuring probe, since otherwise the measuring field does not propagate in the inner space 8 of the pipeline 1 or of the measuring body and interacts with the latter can occur to be measured medium 2.
  • the length L of the electrodes 9, 10, 1 1 is determined significantly the sensitivity of the sensor 6, since the duration of the measuring signals at longer electrodes 9, 10, 1 1 extended to the end of the electrode and back. In the spiral sensor shown, there are many options with regard to the length L but also the width B.
  • the electrodes 9, 10, 1 1 are parallel in spiral form around the
  • the electrodes 9, 10, 1 1 are advantageously the same length, but can also be of different width in this design. With the width and length of the electrodes 10, 1 1, 12 and with the slope of the spiral, the measuring field can be advantageously adapted to the respective measurement task.
  • FIG. 4 A third embodiment of the TDR measuring probe 6 can be seen in FIG. 4.
  • this sensor 6 which is referred to as a concentric sensor 6 or a partial circuit conductor, three electrodes 9, 10, 11 are arranged concentrically to the longitudinal axis 19 on or in the pipeline 1, but the circles are not closed. Again, the pipe needs
  • the electrodes 9, 10, 1 1 are advantageously the same length, the width may be the same or different. About the variation of the width and / or length of the electrodes 9, 10,
  • I I can advantageously dimension the measuring field for the respective measuring task.
  • Fig. 5 shows a schematic representation of a second embodiment of
  • TDR measuring device 17 which can be referred to as PCB on-board solution.
  • PCB on-board solution On a description of the individual electronic components 3, 4, 5, 7 of Measuring electronics 16 are dispensed with because they are identical to the components shown in FIG. 1, with one exception.
  • the measuring probe 6 or the sensor preferably corresponds to that shown in FIG. 4
  • the measuring circuit 6 consisting of partial circuits is not arranged concentrically on or in the pipeline 1, in which the medium 2 to be measured is guided, but concentrically in a bore 13, which is provided in the printed circuit board 12. Through this hole 13, the pipe 1 is guided.
  • the bore 13 is located in the vicinity of the high-frequency connection or the input / output electronics.
  • the preferably three concentric around the bore 13 arranged part-circular electrodes 9, 10, 1 1 are arranged in three layers of the printed circuit board 12.
  • the high-frequency connector 18 and the coaxial cable 14 shown in FIG. 1 are dispensed with in the embodiment of the TDR measuring device 17 according to the invention shown in FIG. 5. In the middle region of the part-circular track sensors 9, 10,
  • the measuring body 1 is made at least in the region of the passage through the bore 13 of the printed circuit board 12 made of an electrically non-conductive material.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

La présente invention concerne un dispositif de mesure par TDR pour déterminer au moins les constantes diélectriques et, le cas échéant, les propriétés des matériaux qui en découlent, en particulier l'humidité et/ou la conductivité d'un milieu (2) s'écoulant dans une conduite (1), ledit dispositif de mesure comprenant un système électronique générateur de signaux (3) qui produit des signaux de mesure TDR, un système électronique émetteur et/ou récepteur (4) qui émet et/ou reçoit les signaux de mesure TDR, un dispositif de couplage/désaccouplage (5) qui couple les signaux de mesure TDR sur une sonde de mesure (6) électroconductrice d'une longueur (L) prédéterminée ou qui les désaccouple de la sonde de mesure (6), et un système électronique de réglage/évaluation (7) qui détermine sur la base de la période des signaux de mesure TDR sur la sonde de mesure (6) au moins la constante diélectrique et, le cas échéant les propriétés de matériaux qui en découlent, en particulier l'humidité et/ou la conductivité, la sonde de mesure (6) étant disposée de manière électriquement isolée à l'extérieur de l'espace intérieur (8) de la conduite (1) traversée par le milieu (2) ou la sonde de mesure (6) étant placée dans la conduite (1) de telle sorte que la surface extérieure de la sonde de mesure (6) tournée vers le milieu (2) se termine en affleurement avec la surface interne de la conduite (1) qui est tournée vers le milieu (2) et qui est configurée de manière à ce que la période et/ou l'amplitude des signaux de mesure de la sonde de mesure (6) soient indépendantes des constantes diélectriques du milieu (2) s'écoulant dans la conduite (1).
EP19719246.1A 2018-05-09 2019-04-18 Dispositif de mesure tdr pour déterminer les constantes diélectriques Pending EP3791171A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018111152 2018-05-09
PCT/EP2019/060094 WO2019214924A1 (fr) 2018-05-09 2019-04-18 Dispositif de mesure tdr pour déterminer les constantes diélectriques

Publications (1)

Publication Number Publication Date
EP3791171A1 true EP3791171A1 (fr) 2021-03-17

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US (1) US11656194B2 (fr)
EP (1) EP3791171A1 (fr)
CN (1) CN112236672A (fr)
DE (1) DE102019110256A1 (fr)
WO (1) WO2019214924A1 (fr)

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CN111337542B (zh) * 2020-04-10 2021-05-14 中南大学 时域反射法监测重金属污染场地中渗透吸力的方法及装置
DE102020134379A1 (de) 2020-12-21 2022-06-23 Endress+Hauser SE+Co. KG Leitfähigkeits-Messung
CN112858393B (zh) * 2021-04-25 2021-07-06 湖南大学 一种基于频率步进原理的tdr测试电导率方法
RU2766059C1 (ru) * 2021-05-14 2022-02-07 Федеральное государственное бюджетное учреждение науки Институт физического материаловедения Сибирского отделения Российской академии наук Способ бесконтактного определения диэлектрической проницаемости жидких диэлектриков в диапазоне 22-40 ГГц
CN113820366B (zh) * 2021-09-26 2024-04-26 河南中原光电测控技术有限公司 一种螺纹式土壤水分测量装置
CN115166373B (zh) * 2022-07-01 2024-03-26 同济大学 一种低真空下的聚合物薄膜复介电系数测量装置和方法

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DE102019110256A1 (de) 2019-11-14
US20210270761A1 (en) 2021-09-02
WO2019214924A1 (fr) 2019-11-14
US11656194B2 (en) 2023-05-23

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