WO2006000378A2 - Mesure capacitive et sans contact d'un niveau de remplissage - Google Patents

Mesure capacitive et sans contact d'un niveau de remplissage Download PDF

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Publication number
WO2006000378A2
WO2006000378A2 PCT/EP2005/006683 EP2005006683W WO2006000378A2 WO 2006000378 A2 WO2006000378 A2 WO 2006000378A2 EP 2005006683 W EP2005006683 W EP 2005006683W WO 2006000378 A2 WO2006000378 A2 WO 2006000378A2
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
electrode
receiving
receiving electrode
medium
Prior art date
Application number
PCT/EP2005/006683
Other languages
German (de)
English (en)
Other versions
WO2006000378A3 (fr
Inventor
Martin Stelzle
Martin Winter
Original Assignee
Accelab 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 Accelab Gmbh filed Critical Accelab Gmbh
Publication of WO2006000378A2 publication Critical patent/WO2006000378A2/fr
Publication of WO2006000378A3 publication Critical patent/WO2006000378A3/fr

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
    • G01F23/26—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/266—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
    • 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
    • G01F23/26—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/265—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors for discrete levels
    • 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
    • G01F23/26—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/268—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes

Definitions

  • the invention relates to a device for non-contact capacitive level measurement of a medium in a vessel with at least partially electrically non-conductive wall regions, wherein at least one transmitting electrode and at least one receiving electrode are provided which partially surrounds the vessel with the medium, and method for operating this device.
  • Devices of this type are used for non-contact measurement of the level of liquids or fluids generally in containers made of non-conductive materials such as glass or plastic.
  • non-conductive materials such as glass or plastic.
  • a float is usually introduced with a float into the vessel with the fluid.
  • the float may include a magnet whose field actuate through the vessel wall arranged as an array magnetic relay and thereby can measure the level in the vessel.
  • the problem here is that depending on the density of the medium in the vessel of the float submersed varies widely, which distorts the measurement result. There is also such floats the tendency for gas bubbles to stick, creating additional buoyancy and also a faulty measurement result.
  • the measuring probe namely the float, inevitably brought into close contact with the medium in the vessel, which can be problematic in many cases.
  • Another non-contact method is to use a capacitive probe in the form of a sheathed dipstick immersed in the liquid.
  • This type of detector is often used to determine the level limit.
  • a modification of the vessel in view of the geometry of the probe to be used is required and in the case of aggressive media in the vessel, there are high demands on the chemical stability of the immersing dipstick.
  • Non-contact is another known technique in which ultrasonic probes are used to measure the time difference between the emission and the reception of an ultrasonic pulse reflected at the upper interface of the medium.
  • the vessel must be modified in geometry to integrate the transmitter and receiver of the ultrasonic device can.
  • the apparatus and electronic effort for this is relatively high.
  • it is not possible to measure arbitrarily small distances between the transmitter and the media interface.
  • electrodes are applied from the outside to the vessel, for example, glued or produced by applying conductor tracks by means of a conductive adhesive.
  • the wall of the vessel must consist of a non-conductive material.
  • High-frequency alternating voltage is supplied via one or more transmitting electrodes, which causes capacitive currents in at least one further electrode modified as a receiving element.
  • the electric field reaches through the vessel wall and the medium in the vessel. Because the Most media have one of 1 different dielectric constant, the loading of the vessel leads to an increase in the capacitance between the electrodes and thus to a proportional increase in the measurable current amplitude.
  • a disadvantage of the known method and the associated device is the occasional occurrence of external interference pulses, which are also collected by the receiving electrode and distort the measurement result.
  • external interference pulses which are also collected by the receiving electrode and distort the measurement result.
  • Object of the present invention is therefore to improve a device and a method of the type described above with the simplest possible technical means to the effect that even with simultaneous operation of other facilities with high-frequency voltage sources even at high interference field amplitudes in the immediate vicinity of the device for non-contact Capacitive level measurement stable and undisturbed level signals can be received at the receiving electrode.
  • this object is achieved in a surprisingly simple and effective manner in that an electrically conductive shield completely covers at least one receiving electrode to the side facing away from the vessel and is electrically insulated from the receiving electrode.
  • the electrically conductive shield and at least one transmitting electrode to the side facing away from the vessel completely covers and is electrically isolated from the transmitting electrode.
  • the pulses radiated outward from the transmitting electrode can also be shielded, so that electrical disturbances in the high-frequency range in neighboring apparatus are avoided.
  • the electrically conductive shielding of the electrodes in the device according to the invention is preferably made of metal, in particular of copper or aluminum.
  • the shield comprises a metal foil, a metal sheet or a metal-coated or vapor-coated carrier element.
  • the electrically conductive shield completely surrounds the vessel in the circumferential direction, so at least in the radial direction both a radiation of RF electrical noise pulses to the outside and a capture of external interference pulses from radial directions the vessel can be excluded.
  • the electrically conductive shield completely surrounds the vessel. In this way, any RF interference can be prevented from entering and exiting the device.
  • the device according to the invention is then completely "HF-tight".
  • a further preferred embodiment of the device according to the invention is characterized in that the area F s of the transmitting electrode (s) is 5 times to 100 times, preferably at least 10 times, the area F E of the receiving electrode (s). In this way, the capacity of the transmitting electrodes hardly goes into the level measurement.
  • an electrically insulating spacer is provided with a radial thickness d, which holds the electrically conductive shield at a predetermined radial distance to the transmitting and receiving electrodes.
  • the dielectric constant of the spacer is ⁇ 2, so that parasitic capacitances remain particularly low and do not adversely affect the received measurement signals.
  • the spacer may in particular be made of foamed plastic, for example of foam rubber or polystyrene.
  • the spacer has a radial thickness d between 1 mm and 50 mm, preferably between 10 mm and 30 mm which is adapted to the proportions of vessels commonly used in the laboratory and their geometry.
  • a possible geometric configuration of the device according to the invention may consist in that the at least one receiving electrode and a transmitting electrode are arranged adjacent to one another on the vessel.
  • the at least one receiving electrode may be arranged on a side of the vessel which is opposite to a transmitting electrode.
  • This type of arrangement is particularly advantageous in vessels of relatively small diameter. In particular, this results in a particularly good penetration of the radiated from the transmitting electrode electric field through the entire vessel.
  • a particularly preferred development of one of the two above-mentioned embodiments of the invention is characterized in that a first receiving electrode is provided, which is band-shaped and whose length I 1 in the vertical direction approximately corresponds to the vertical extent of the adjacent or opposite transmitting electrode, and at least one second receiving electrode is provided, which is also adjacent to the transmitting electrode or lies opposite one another has band-shaped extension in the horizontal direction and serves as a reference indicator for an absolute measurement of the level height of the medium in the vessel.
  • the distance D between the at least one receiving electrode and the associated transmitting electrode is at most ten times the radial thickness d of the spacer.
  • both geometries with adjacent transmitting and receiving electrodes as well as geometries can be realized with respect to the vessel opposite arranged transmitting and receiving electrodes.
  • Embodiments in which the transmitting electrode (s) and the receiving electrode (s) are constructed from metal foil or sheet metal or comprise a metal-coated or vapor-coated carrier element are also preferred. Such electrode arrangements are simple, inexpensive and particularly accurate to produce for each required geometry.
  • the transmitting electrode (s) and the receiving electrode (s) are part of a sleeve, which can be slipped over the vessel with the medium to be measured and this then surrounds annular and clamping.
  • the cuff allows a very easy handling and adjustment of the device according to the invention and optimal positioning.
  • the cuff will be constructed of flexible material.
  • the electrically conductive shield and optionally an electrically insulating spacer are also part of the sleeve described above. The cuff with the electrodes, the spacer and the shield can then be simply slipped over a corresponding vessel for the purpose of a measurement, without having to mount other parts of the apparatus.
  • a further preferred embodiment of the invention provides that a holder with juxtaposed receiving openings for simultaneously receiving a plurality of vessels with the same or different media is provided and that each receiving opening contains at least one transmitting electrode and at least one receiving electrode and each of an electrically conductive, with respect the at least one transmitting and receiving electrode electrically insulated shield is surrounded. This allows in a simple way, the simultaneous measurement of the filling heights of a variety of vessels and therefore serves to save valuable measurement time.
  • An embodiment of the device according to the invention in which the at least one receiving electrode and the at least one transmitting electrode are parts of a self-adhering film or of a self-adhering film stack is also particularly simple and convenient to use.
  • This embodiment can be advantageously further developed in that the electrically conductive shield and optionally an electrically insulating spacer of the type described above are also part of the self-adhesive film or self-adhesive film stack.
  • a current-voltage converter is provided, with which the signals received by the receiving electrode can be recorded.
  • a current-voltage converter for example, instead of simple preamplifiers or resistors to A number of advantages can be achieved by generating a voltage drop:
  • the signal amplitude at the output of the current-voltage converter is directly proportional to the capacitance;
  • the input of the current-to-voltage converter represents a virtual "ground", that is, on the cable that is led to the input, there is no large voltage amplitude, thus reducing the risk of crosstalk to adjacent channels, the sensitivity of the arrangement is very easy adjustable and customizable.
  • an electronic circuit which includes an oscillator for charging the transmitting electrode (s) with an AC signal in the frequency range between 10 kHz and 100 MHz, preferably between 0.1 MHz and 10 MHz, and an evaluation unit for processing of comprises signals received by the receiving electrodes.
  • This type of multi-frequency measurement is known per se and has proven itself in generic devices.
  • FFT fast Fourier transformation
  • the evaluation unit has a multiplier for forming the product of the signal transmitted by the transmitting electrode and received by a receiving electrode, and in that the low-pass filter is connected downstream of the multiplier.
  • the scope of the present invention also includes a method for operating a device according to the invention of the type described above, which is characterized in that for the detection of changes in the level of the medium level in the vessel a permanently continuous measurement over a certain period of time or at intervals Measurements are made.
  • the operating method can be designed so that an analog signal is generated, which is proportional to the level height of the medium in the vessel, from which the filling level is determined in a continuous, non-discrete manner.
  • Continuous measurement is to be understood here as a recording method in which not only a “level detection” is performed, but the generation of an analog signal, which is proportional to the actual actual filling level.
  • another method variant is that in which the filling level height is determined discretely at a position defined by the arrangement of the at least one receiving electrode for the purpose of a level detection.
  • a combination of the two mentioned alternative variants of the method can be achieved by using a plurality of receiving electrodes, and by performing both a discrete measurement of the filling level heights defined by the arrangement of the receiving electrodes and a continuous measurement of the filling level by at least one further receiving electrode.
  • a method variant in which a reference measurement and determination of the dielectric properties of the medium takes place by measuring the signals from at least two receiving electrodes.
  • This method variant can be further improved, in particular, by determining the filling level of the medium in the vessel independently of the properties of the medium.
  • a variant of the method according to the invention for operating a device of the type according to the invention is particularly preferred, in which a multi-frequency measurement with subsequent analysis of the measurement signal is carried out by means of fast Fourier transformation.
  • FIG. 1b shows a schematic side view of the embodiment according to FIG. 1a without shielding having a band-shaped first receiving electrode in the vertical extent and three further receiving electrodes arranged vertically one above the other and each having a horizontal extent;
  • FIG. 2 shows a schematic block diagram for the electrical connection of Device according to the invention (without shielding).
  • Fig. Ia In the right half of Fig. Ia is shown schematically in horizontal section an embodiment of the device according to the invention with a transmitting electrode 1, one of the transmitting electrode 1 at a distance D opposite arranged first receiving electrode 2, a further receiving electrode 2 'and an electrically conductive shield 3.
  • the transmitting electrode 1 and the receiving electrodes 2, 2 ' are applied to an electrically non-conductive support member 4, for example vapor-deposited as metal layers or glued as metal foils and separated from the shield 3 by an electrically insulating spacer 5 of thickness d.
  • the entire arrangement is designed as a kind of cuff and can be put over a vessel 6 with a medium 7 for the purpose of level measurement, as is indicated schematically in Fig. 2.
  • the shield 3 and the spacer 5 have been omitted for the sake of clarity and only the first receiving electrode 2 with a vertical extension li, the further receiving electrode 2 'and further receiving electrodes 2 ", 2 arranged in the vertical direction underneath '", which each serve as reference indicators.
  • Fig. 2 shows a block diagram of the measuring arrangement according to the invention, wherein the sake of clarity, the shield 3 is not shown: Between the transmitting electrode 1 and the receiving electrode 2, there is an electrical capacitance C F , which increases in proportion to the level of the medium 7 in the vessel 6.
  • a current-voltage converter 9 generates a proportional to the current amplitude RF AC voltage U F , which is performed together with the original oscillator signal to the inputs of an analog multiplier 10.
  • a low-pass filter 11 By means of a low-pass filter 11, a DC output signal is generated from the product signal, which does not disappear only for those signal components of U F , which have exactly the same frequency as the oscillator signal. This effectively suppresses any signals injected by interference fields and can not falsify the measurement.
  • an output amplifier 12 designed as an impedance converter buffers the low-pass filter 11, permits offset and level adaptation to a subsequently switched peripheral or data recording.

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

Abstract

L'invention concerne un dispositif de mesure capacitive et sans contact d'un niveau de remplissage d'un agent (7) dans un contenant (6) ayant, au moins par sections, des zones paroi non électroconductrices. Au moins une électronique émettrice (1) et au moins une électrode réceptrice (2,2',2',2' ) entourent au moins partiellement le contenant (6) rempli de l'agent (7). L'invention est caractérisée en ce qu'un écran électroconducteur (3) recouvre entièrement au moins une électronique réceptrice (2,2',2',2' ) sur la face opposée au contenant (6) et est électriquement isolé par l'électrode réceptrice (2,2',2',2' ). Ainsi l'électrode réceptrice (2,2',2',2' ) peut recevoir des signaux de niveau de remplissage stables et non perturbés même en cas de fonctionnement simultané d'autres dispositifs avec des sources de tension fréquence, voire même en cas d'amplitudes de champ perturbateur élevées à proximité immédiate du dispositif pour la mesure capacitive et sans contact du niveau de remplissage.
PCT/EP2005/006683 2004-06-25 2005-06-21 Mesure capacitive et sans contact d'un niveau de remplissage WO2006000378A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410030740 DE102004030740A1 (de) 2004-06-25 2004-06-25 Berührungslose kapazitive Füllstandsmessung
DE102004030740.7 2004-06-25

Publications (2)

Publication Number Publication Date
WO2006000378A2 true WO2006000378A2 (fr) 2006-01-05
WO2006000378A3 WO2006000378A3 (fr) 2006-07-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/006683 WO2006000378A2 (fr) 2004-06-25 2005-06-21 Mesure capacitive et sans contact d'un niveau de remplissage

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DE (1) DE102004030740A1 (fr)
WO (1) WO2006000378A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7794737B2 (en) 2003-10-16 2010-09-14 Kimberly-Clark Worldwide, Inc. Odor absorbing extrudates
DE102011054133A1 (de) 2011-10-01 2013-04-04 Hamilton Bonaduz Ag Füllstandsmessvorrichtung für Atemluftbefeuchter
CN113984138A (zh) * 2021-09-10 2022-01-28 中国航空工业集团公司西安航空计算技术研究所 一种基于fft频谱分析的航空燃油测量系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014114943B3 (de) * 2014-10-15 2015-07-16 Endress + Hauser Gmbh + Co. Kg Vibronischer Sensor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3218863A (en) * 1962-05-07 1965-11-23 Wayne Kerr Lab Ltd Pressure responsive apparatus
US4749988A (en) * 1986-11-20 1988-06-07 Imtec Products, Inc. Non-invasive liquid level sensor
US5582798A (en) * 1995-02-23 1996-12-10 Cyberlab Inc. Volume sensing device
DE19645970A1 (de) * 1996-11-07 1998-05-14 Heinz Dipl Ing Ploechinger Kapazitiver Füllstandsensor zum Erfassen des Füllstandes eines innerhalb eines Behälters befindlichen Fluids

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3218863A (en) * 1962-05-07 1965-11-23 Wayne Kerr Lab Ltd Pressure responsive apparatus
US4749988A (en) * 1986-11-20 1988-06-07 Imtec Products, Inc. Non-invasive liquid level sensor
US5582798A (en) * 1995-02-23 1996-12-10 Cyberlab Inc. Volume sensing device
DE19645970A1 (de) * 1996-11-07 1998-05-14 Heinz Dipl Ing Ploechinger Kapazitiver Füllstandsensor zum Erfassen des Füllstandes eines innerhalb eines Behälters befindlichen Fluids

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7794737B2 (en) 2003-10-16 2010-09-14 Kimberly-Clark Worldwide, Inc. Odor absorbing extrudates
DE102011054133A1 (de) 2011-10-01 2013-04-04 Hamilton Bonaduz Ag Füllstandsmessvorrichtung für Atemluftbefeuchter
WO2013045572A1 (fr) 2011-10-01 2013-04-04 Hamilton Bonaduz Ag Dispositif de mesure de niveau pour humidificateur d'air inhalé
CN113984138A (zh) * 2021-09-10 2022-01-28 中国航空工业集团公司西安航空计算技术研究所 一种基于fft频谱分析的航空燃油测量系统
CN113984138B (zh) * 2021-09-10 2023-09-05 中国航空工业集团公司西安航空计算技术研究所 一种基于fft频谱分析的航空燃油测量系统

Also Published As

Publication number Publication date
DE102004030740A1 (de) 2006-01-19
WO2006000378A3 (fr) 2006-07-06

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