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WO2006040207A1 - Procede pour enregistrer des parametres d'etat d'un fluide - Google Patents

Procede pour enregistrer des parametres d'etat d'un fluide Download PDF

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Publication number
WO2006040207A1
WO2006040207A1 PCT/EP2005/054003 EP2005054003W WO2006040207A1 WO 2006040207 A1 WO2006040207 A1 WO 2006040207A1 EP 2005054003 W EP2005054003 W EP 2005054003W WO 2006040207 A1 WO2006040207 A1 WO 2006040207A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
quartz
viscosity
permittivity
oscillator
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/EP2005/054003
Other languages
German (de)
English (en)
Inventor
Bernhard Jakoby
Matthias Buskies
Monika Scherer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2006040207A1 publication Critical patent/WO2006040207A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
    • G01N11/16—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring damping effect upon oscillatory body
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N2011/0006—Calibrating, controlling or cleaning viscometers
    • G01N2011/0013—Temperature compensation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N2011/006—Determining flow properties indirectly by measuring other parameters of the system
    • G01N2011/0066—Determining flow properties indirectly by measuring other parameters of the system electrical properties

Definitions

  • the invention is based on a viscosity sensor arrangement or a method for detecting state parameters of a liquid according to the preambles of the independent claims.
  • piezoelectric thickness shifters which are made of quartz for example, have been used for some time. See, for example, S. J. Martin et. al., Sens. Act. A 44 (1994) pages 209-218.
  • the resonance frequency of the natural vibration and its damping change depending on the viscosity and the density of the viscous fluid. Since the density for typical liquids varies to a much lesser extent than the viscosity, such a component practically represents a viscosity sensor, as illustrated by way of example in DE 101 12433 A1.
  • an oscillator circuit is used to evaluate the piezoelectric thickness shear oscillator, as described in DE 199 58 769 A1 or DE 102 03 475 A1.
  • a first sensor element in the form of a surface oscillator permits the determination of the viscosity
  • a second sensor element uses a spatially separated capacitor structure to permit the determination of the viscosity Conductivity determination of the liquid allows.
  • the disadvantage of gradient-related effects such as temperature effects in this sensor is corrected in a sensor according to the unpublished document DE 103 34 241 Al by means of a spatial combination of both sensor elements.
  • the present invention describes a viscosity sensor arrangement or a method by means of a viscosity sensor arrangement for detecting state parameters of a
  • the viscosity sensor arrangement includes a volume oscillator and electrical supply lines.
  • the volume oscillator is designed such that it has a (vibrating) quartz with at least two quartz electrodes.
  • the quartz electrodes are connected by means of electrical contact points via the electrical supply lines with a control / evaluation.
  • both the viscosity and the permittivity of the liquid can be detected with the described viscosity sensor arrangement by the control / evaluation electronics performing the detection as a function of the activation of the volume oscillator.
  • both state parameters can be detected in the same place in the liquid, whereby gradient-induced effects, in particular temperature effects at fast
  • the two quartz electrodes have different electrode shapes.
  • the two quartz electrodes are not congruently mounted on the two sides of the quartz and / or that at least one of the quartz electrodes is configured as a ring or a circle.
  • a further electrode on one of the sides of the quartz.
  • An additional capacitance measurement can be carried out at this further electrode.
  • the viscosity sensor arrangement and / or the volume oscillator can be assigned a temperature sensor, wherein it is provided in particular that this temperature sensor is connected to the drive / evaluation unit.
  • the viscosity of the liquid is detected by means of a quartz resonator, which i.a. is formed by the volume oscillator.
  • the viscosity is dependent on the viscous damping and / or the frequency shift of
  • Resonant frequency of the liquid in the part of the quartz resonator detected.
  • One way to detect the permittivity of the liquid is to perform a capacitance measurement on another electrode on one side of the quartz. The permittivity then results as a function of the capacity size thus obtained.
  • the permittivity is determined as a function of the stray capacitance detected at the quartz resonator.
  • both the volume oscillator and at least part of the supply lines are taken into account in the detection of the stray capacitance. It can be provided that the determination of the stray capacitances, etc., the determination of the
  • Permittivity is carried out simultaneously to the detection of viscosity.
  • Quartz can be subtracted from the measured total stray capacitance.
  • FIG. 1 shows a typical structure of a quartz resonator in a liquid container.
  • Figures 2a and 2b show a schematic representation of the measuring arrangement and an electrical equivalent circuit diagram of the quartz resonator.
  • a representation of the stray field triggering the stray field on the quartz is shown in FIG..
  • a possible embodiment of the electrodes on the quartz disk is shown in FIG. 4.
  • FIG. 5 shows a modification of the electrical connections.
  • a detection of the permittivity with one and the same sensor element will be described below.
  • a typical viscosity sensor arrangement is used as a measuring arrangement, as it is known for example from the document DE 101 12433 Al.
  • any other embodiment of a corresponding viscosity sensor arrangement with the present invention idea can be operated.
  • the measuring arrangement according to FIG. 1 is for detecting the viscosity or other liquid properties in a container 190 filled with a liquid 180, for example an oil. It is already well known for the viscosity and / or density measurement piezoelectric vibrator, in particular
  • volume oscillator To use volume oscillator. If such a volume oscillator immersed in a viscous liquid, so its resonant frequency of the natural vibration and its damping changes depending on the viscosity and the density of the liquid.
  • a volume oscillator such as a quartz piezoelectric crystal 100, is disk-shaped and completely immersed in the liquid 180 in the container 190.
  • the disc-shaped quartz sensor 100 has two electrical contact points, which may be formed, for example, as gold or chrome electrodes 110 and 120, respectively.
  • gold or chromium electrodes have proven to be particularly robust materials.
  • the quartz electrodes 110 and 120 are connected via a suitable conductive adhesive 135 and contact springs 130 with electrical supply lines 140, which are formed for example as gold-plated or chrome-plated wires. These gold-plated or chrome-plated wires have also proved to be particularly robust conductor materials in a specific application in the engine oil of a vehicle.
  • the contact springs 130 For mechanical reception of the piezoelectric quartz disk 100, the contact springs 130 have a slotted shape.
  • the conductive adhesive 135 ensures the electrical and mechanical contacting of the piezoelectric quartz disk 100 with the contact springs 130 at the contact points located on the edge of the quartz electrodes.
  • the isotropically electrically conductive adhesive 135 in one embodiment of the invention consists of epoxy resin, phenolic resin and / or polyimide.
  • the material of the conductive adhesive 135 may also be based on an epoxy-phenol base.
  • the isotropic conductive adhesives 135 are usually provided with metal particles, preferably nickel and / or gold particles, in flake or spherical form or mixtures in order to achieve a better conductivity.
  • the nickel or gold particles may have a particle size of about 2 microns to 20 microns.
  • the concentration of the nickel or gold particles in the conductive adhesive 8 is about 75 to 95 wt.%.
  • the electrical supply lines 140 may either be routed directly through the fixture 150 of the measuring assembly by means of insulated feedthroughs 155, or may be connected to corresponding terminal wires 170 on the wall of the container 190 by suitable bonding techniques, such as welding. It is crucial that an electrical connection of the measuring arrangement is made via the contact points of the quartz electrodes 110 and 120 and the electrical supply lines 140 with a control / Ausnceelektronik 199 outside the container 190 for electrical control of the measuring device and a subsequent evaluation of the results the contact points used, Adhesive 135 and electrical supply lines 140 with respect to the liquid to be measured 180 are resistant.
  • liquids other than oil may be measured using resistive pad materials, conductive adhesives with corresponding metal particles, and electrical feed line materials with respect to this fluid.
  • the measuring arrangement consisting of the quartz disk 100, the quartz electrodes 110 and 120, and the supply lines 140 can be provided with a cover without affecting the measured value recording, as long as the quartz disk 100 can come into contact with the liquid 180.
  • FIG. 2a The evaluation of the measuring signals of the measuring arrangement 200 will be explained in greater detail on the basis of a schematic representation in FIG. 2a.
  • the container 180 is the liquid 180, for example an oil.
  • the oscillator designated by the reference numeral 220 is immersed.
  • the oscillator 220 is connected to a control and evaluation unit 199, which is able to transmit the measurement results with respect to the quantities of the liquid 180 to be measured by means of wired or non-wired channels not shown in FIG. 2a.
  • a control and evaluation unit 199 which is able to transmit the measurement results with respect to the quantities of the liquid 180 to be measured by means of wired or non-wired channels not shown in FIG. 2a.
  • an equivalent circuit diagram according to FIG. 2b can be used for the quartz resonator used to detect the viscosity or density of the liquid 180.
  • the switching symbol 200 corresponds to a vibration system consisting of the oscillator 220 or the quartz disk 100 and the liquid 180 coupled to the oscillator. As shown in the right-hand part of FIG. 2b, this vibration system consists of a first part 230 and a second part 240 During the first part
  • the dry fraction i. represents the portion of the vibrating system that is not in contact with the liquid 180
  • the second portion 240 represents the liquid portion of the vibrating system, i. the proportion of which is in contact with the liquid 180.
  • the dry portion 230 and the liquid portion 240 are connected in the sense of a series connection and arranged in the right part of Figure 2b one behind the other.
  • the dry portion 230 in this case comprises a vibrator 220, whose behavior can be described by a first capacitance Ci, a first inductance Li and a first resistance Rl.
  • the liquid portion 240 in this case comprises the to the vibrator 220th adjacent liquid layer or the proportion of the liquid 180, which is influenced by the mechanical vibrations of the vibrator 220.
  • the behavior of the liquid layer coupled to the oscillator 220 or of the portion of the liquid 180 coupled to the oscillator 220 can be described by a second inductance L 2 and a second resistance R 2 .
  • the second resistance R 2 is approximately proportional to the square root of the product of the density and the dynamic viscosity of the liquid.
  • the second resistor R 2 represents the viscous damping by the liquid.
  • the second inductance L 2 causes a frequency shift through the viscous fluid, wherein the second inductance L 2 also includes, in the case of rough resonator surfaces, portions which arise due to "trapped" fluid portions in the rough resonator surface. This frequency shift is also approximately proportional to the square root of the product of the density and the dynamic viscosity of the fluid. At known or sufficiently constant density, the resonator can therefore be used to determine the (dynamic) viscosity.
  • the permittivity of the liquid can be detected by an additional evaluation of the stray capacitance C 0 of the quartz with the same sensor element 220.
  • Stray capacitance C 0 is composed of different shares.
  • the proportion C Q can be identified, which is determined by the field between the two quartz electrodes 110 and 120 through the quartz disk 100.
  • the leads 170 and generate the portion of the bushings 160 is not immersed in the liquid, in addition to C Q C to another one portion which is not affected by the liquid. If one subtracts these two components C Q and C Zu from the total stray capacitance C 0 , essentially the proportion C F i of the stray capacitance which is determined by the field of the electrodes, contact springs and supply lines which leads through the liquid remains.
  • C F i according to C €,. a measured variable are determined from which the permittivity can be derived.
  • the permittivity detection can be optimized.
  • Figure 3 the situation of the electric field 340 between the quartz electrodes 310 in the quartz disk 320 and in the outer space with the Stray field 330 shown. If the quartz electrodes 310 deviate from the circular, circular electrode shape, then an increase of the stray field component and thus an increase in the value of C F i can be achieved.
  • a deviation from the exact coverage of the two electrodes on the quartz can lead to an increase of the scattering proportion by the liquid.
  • FIG. 4 A further embodiment of the quartz electrodes for detecting the permittivity is shown in FIG.
  • a further electrode 430 with an additional connection is produced on one side of the quartz 400 next to the quartz electrode 410, wherein the quartz electrode 410 and the further electrode 430 are separated from each other (electrically) by a region 440.
  • a capacitance measurement can be carried out, from which also the permittivity can be derived.
  • the two quartz electrodes 410 and 420 on the two sides of the quartz 400 can also be shifted relative to one another.
  • FIG. 500 Another possibility for increasing the stray field through the liquid is shown in FIG.
  • FIG. 500 Another possibility for increasing the stray field through the liquid is shown in FIG.
  • a modification of the electrical implementation is conceivable, for example, by a larger area is used or the bushings are performed closer together.

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

Abstract

La présente invention concerne un ensemble capteur de viscosité et un procédé utilisant un ensemble capteur de viscosité pour enregistrer des paramètres d'état d'un fluide. Selon la présente invention, cet ensemble capteur de viscosité contient un oscillateur de volume et des lignes d'alimentation électrique. Cet oscillateur de volume est conçu, de façon à présenter un cristal (oscillateur) pourvu d'au moins deux électrodes de cristal. Ces électrodes de cristal sont connectées à un dispositif électronique de commande/d'évaluation au moyen de points de contact électrique par l'intermédiaire des lignes d'alimentation électrique. Pour l'enregistrement des paramètres d'état, cet oscillateur de volume est entièrement recouvert du fluide. Selon ladite invention, l'ensemble capteur de viscosité décrit permet d'enregistrer à la fois la viscosité et la permittivité du fluide, le dispositif de commande/d'évaluation effectuant l'enregistrement en fonction de la commande de l'oscillateur de volume.
PCT/EP2005/054003 2004-10-12 2005-08-15 Procede pour enregistrer des parametres d'etat d'un fluide Ceased WO2006040207A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410049580 DE102004049580A1 (de) 2004-10-12 2004-10-12 Verfahren zur Erfassung von Zustandsparametern einer Flüssigkeit
DE102004049580.7 2004-10-12

Publications (1)

Publication Number Publication Date
WO2006040207A1 true WO2006040207A1 (fr) 2006-04-20

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PCT/EP2005/054003 Ceased WO2006040207A1 (fr) 2004-10-12 2005-08-15 Procede pour enregistrer des parametres d'etat d'un fluide

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DE (1) DE102004049580A1 (fr)
WO (1) WO2006040207A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110672464A (zh) * 2019-10-21 2020-01-10 上海大学 一种高温金属熔体动态流动性测试装置及金属熔体流动测量方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005043036B4 (de) * 2005-09-09 2011-03-24 Siemens Ag Vorrichtung zur Ermittlung der viskosen Eigenschaften einer Flüssigkeit
DE102007043811A1 (de) 2007-09-13 2009-03-19 Endress + Hauser Gmbh + Co. Kg Verfahren zur Bestimmung und/oder Überwachung der Viskosität und entsprechende Vorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850799A1 (de) * 1998-11-04 2000-05-11 Bosch Gmbh Robert Sensoranordnung zur Ermittlung physikalischer Eigenschaften von Flüssigkeiten
US20010010174A1 (en) * 1997-10-08 2001-08-02 Leonid Matsiev Method and apparatus for characterizing materials by using a mechanical resonator
GB2366384A (en) * 2000-08-30 2002-03-06 Christopher Barnes Simultaneous or sequential measurement of viscous and dielectric material properties using the same sensor element
US20020170341A1 (en) * 2001-03-15 2002-11-21 Bernhard Jakoby Measuring system for a viscosity measurement of liquids
WO2004086020A2 (fr) * 2003-03-21 2004-10-07 Symyx Technologies, Inc. Circuit integre specifique a une application pour commander l'analyse d'un fluide

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010010174A1 (en) * 1997-10-08 2001-08-02 Leonid Matsiev Method and apparatus for characterizing materials by using a mechanical resonator
DE19850799A1 (de) * 1998-11-04 2000-05-11 Bosch Gmbh Robert Sensoranordnung zur Ermittlung physikalischer Eigenschaften von Flüssigkeiten
GB2366384A (en) * 2000-08-30 2002-03-06 Christopher Barnes Simultaneous or sequential measurement of viscous and dielectric material properties using the same sensor element
US20020170341A1 (en) * 2001-03-15 2002-11-21 Bernhard Jakoby Measuring system for a viscosity measurement of liquids
WO2004086020A2 (fr) * 2003-03-21 2004-10-07 Symyx Technologies, Inc. Circuit integre specifique a une application pour commander l'analyse d'un fluide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110672464A (zh) * 2019-10-21 2020-01-10 上海大学 一种高温金属熔体动态流动性测试装置及金属熔体流动测量方法

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