DE4135046A1 - Coated electrode for sensor for detection of dielectric properties - is used with fluid, gas-form and/or pourable media and comprises outer and inner conductors forming capacitor enclosed in e.g. dielectric plastic layer - Google Patents

Coated electrode for sensor for detection of dielectric properties - is used with fluid, gas-form and/or pourable media and comprises outer and inner conductors forming capacitor enclosed in e.g. dielectric plastic layer

Info

Publication number
DE4135046A1
DE4135046A1 DE19914135046 DE4135046A DE4135046A1 DE 4135046 A1 DE4135046 A1 DE 4135046A1 DE 19914135046 DE19914135046 DE 19914135046 DE 4135046 A DE4135046 A DE 4135046A DE 4135046 A1 DE4135046 A1 DE 4135046A1
Authority
DE
Germany
Prior art keywords
dielectric
electrode
fluid
dielectric properties
gas
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
DE19914135046
Other languages
German (de)
Inventor
Udo Jarisch
Kurt Dipl Ing Lindner
Rainer Schmieg
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.)
Airbus Defence and Space GmbH
Original Assignee
Deutsche Aerospace AG
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
Priority claimed from DE19904029667 external-priority patent/DE4029667A1/en
Application filed by Deutsche Aerospace AG filed Critical Deutsche Aerospace AG
Priority to DE19914135046 priority Critical patent/DE4135046A1/en
Publication of DE4135046A1 publication Critical patent/DE4135046A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G01N27/226—Construction of measuring vessels; Electrodes therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (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)

Abstract

The electrode comprises an outer and an inner conductor, the two conductors forming a capacitor, in which the medium to be examined is located. The capacitor is built into a generator connected to a filter which in turn is connected to an evaluation unit with a display. The outer conductor and the inner conductor are enclosed with a dielectric coating of plastic or closed plasma ceramic and on the basis of PTFE or PTFE mica coating. USE/ADVANTAGE - To detect the dielectric properties and their relative alterations of fluid, gas-form and/or pourable media.

Description

Die Erfindung betrifft eine Elektrode zur Detektion der dielektrischen Eigenschaften sowie der relativen Ände­ rungen dieser dielektrischen Eigenschaften von Flüssigkei­ ten, gasförmigen und/oder schüttfähigen Medien gemäß dem Oberbegriff des Patentanspruchs 1 nach Patent DBP . . . (Pa­ tentanmeldung P 40 29 667.9).The invention relates to an electrode for the detection of dielectric properties and the relative changes of these dielectric properties of liquids ten, gaseous and / or pourable media according to the Preamble of claim 1 according to patent DBP. . . (Pa tent registration P 40 29 667.9).

Die Erfindung der genannten Art wird unter anderem zur De­ tektion der Qualität, der Dielektrizität und der Menge von Flüssigkeiten eingesetzt und kommt daher z. B. im Kfz-Be­ reich sowie in chemischen Bereichen zur Anwendung. The invention of the type mentioned is, inter alia, De tection of quality, dielectric and quantity of Liquids used and therefore comes z. B. in motor vehicle loading rich as well as in chemical areas.  

Bei dem Sensor gemäß dem Hauptpatent handelt es sich um einen RC-Generator mit kapazitiver Meßsonde. Mittels einer PLL (auch Phasenregelschleife oder Phase Locked Loop ge­ nannt), die als Filter wirkt, wird die durch die Meßsonde beeinflußte RC-Generatorschwingung selektiert und dadurch auf die Eigenschaften des Mediums Rückschlüsse gezogen. So ist z. B. das Filter derart einstellbar, daß mit zunehmen­ dem Wassergehalt, beispielsweise einer Bremsflüssigkeit, die im RC-Generator generierte Schwingung aus dem Fangbe­ reich des Filters herauswandert, was in einer Auswerteein­ heit mit Anzeige z. B. in einer Personenkraftwagenfahr­ gastzelle oder in einem Bordrechner zur Anzeige gebracht werden kann bzw. bei späteren Inspektionen aus dem Bordrechner dem Servicepersonal angezeigt werden kann. Die Elektrode selbst ist als unbeschichtete Kondensatorelek­ trode ausgebildet und sollte daher nicht aggressiven Me­ dien ausgesetzt sein, um die Zerstörung der Elektrode zu vermeiden.The sensor according to the main patent is an RC generator with a capacitive measuring probe. By means of a PLL (also phase locked loop or phase locked loop called), which acts as a filter, is by the measuring probe influenced RC generator vibration selected and thereby conclusions can be drawn about the properties of the medium. So is z. B. the filter so adjustable that increase with the water content, for example a brake fluid, the vibration generated in the RC generator from the Fangbe range of the filter migrates what is in an evaluation unit with display z. B. in a passenger car driving guest cell or displayed in an on-board computer can be used in later inspections On-board computer can be displayed to the service personnel. The The electrode itself is an uncoated capacitor electrode trode trained and should therefore not aggressive Me be exposed to the destruction of the electrode avoid.

Der Erfindung liegt die Aufgabe zugrunde, eine Anordnung der eingangs genannten Art zu realisieren, mittels welcher der Zustand (aus chemischer, elektrischer und mechanischer Sicht) von diversen aggressiven Medien detektierbar ist.The invention has for its object an arrangement to implement the type mentioned above, by means of which the state (from chemical, electrical and mechanical View) from various aggressive media is detectable.

Die erfindungsgemäße Lösung der Aufgabe ist in dem Pa­ tentanspruch 1 beschrieben. In dem Unteranspruch ist ei­ ne vorteilhafte Weiterbildung der Erfindung aufgeführt.The achievement of the object is in Pa Claim 1 described. In the subclaim is ei ne advantageous development of the invention listed.

Der erfindungsgemäße Lösungsgedanke besteht darin, daß der Außenleiter und der Innenleiter der Elektrode mit ei­ ner dielektrischen Beschichtung aus Kunststoff oder ge­ schlossener Plasmakeramik oder auf der Basis einer PTFE oder PTFE-Glimmer-Beschichtung umschlossen ist. Hierbei steht PTFE für Polytetrafluorethylen.The inventive concept is that the outer conductor and the inner conductor of the electrode with egg ner dielectric coating made of plastic or ge closed plasma ceramic or based on a PTFE  or PTFE mica coating is enclosed. Here PTFE stands for polytetrafluoroethylene.

Die gefundene Lösung ist leicht herstellbar, preiswert und materialsparend ausführbar. Sie erlaubt, den Zustand auch aggressiver Medien zerstörungsfrei zu ermitteln und zu überprüfen.The solution found is easy to manufacture, inexpensive and Can be carried out in a material-saving manner. It allows the condition too aggressive media non-destructively to determine and check.

Eine erfindungsgemäße Weiterbildung besteht darin, die Elektrode in dem Bereich, der dem zu messenden Medium aus­ gesetzt ist, in ein die Elektrode umschließendes dünnwan­ diges dielektrisches Gehäuse einzubauen.A further development according to the invention consists in the Electrode in the area that is made up of the medium to be measured is placed in a thin wall enclosing the electrode diges dielectric housing to install.

Claims (2)

1. Elektrode, insbesondere für einen Sensor zur Detektion der dielektrischen Eigenschaften, sowie der relativen Än­ derungen dieser dielektrischen Eigenschaften von flüssi­ gen, gasförmigen und/oder schüttfähigen Medien, bestehend aus einer Elektrode, die als Außenleiter mit Innenleiter ausgebildet ist, wobei der Außenleiter mit dem Innenleiter einen Kondensator bildet, in welchem sich das zu untersu­ chende Medium befindet, welche an einem Generator ausge­ bildet ist, wobei dieser Generator an ein Filter und die­ ses Filter an einer Auswerteeinheit mit Anzeige ange­ schlossen ist, nach Patent DBP . . . (Patentanmeldung P 40 29 667.9), dadurch gekennzeichnet, daß der Außenleiter und der Innenleiter mit einer dielektrischen Beschichtung aus Kunststoff oder geschlossener Plasmakeramik oder auf der Basis einer PTFE oder PTFE-Glimmer-Beschichtung umschlos­ sen ist. 1. Electrode, in particular for a sensor for detecting the dielectric properties, and the relative changes in these dielectric properties of liquid, gaseous and / or pourable media, consisting of an electrode which is designed as an outer conductor with an inner conductor, the outer conductor with the inner conductor forms a capacitor in which the medium to be examined is located, which is formed on a generator, this generator being connected to a filter and this filter to an evaluation unit with display, according to the DBP patent. . . (Patent application P 40 29 667.9), characterized in that the outer conductor and the inner conductor are enclosed with a dielectric coating made of plastic or closed plasma ceramic or on the basis of a PTFE or PTFE mica coating. 2. Elektrode nach Anspruch 1, dadurch gekennzeichnet, daß die Elektrode in dem Bereich, der dem zu messenden Medium ausgesetzt ist, von einem dünnwandigen dielektrischen Ge­ häuse umschlossen ist.2. Electrode according to claim 1, characterized in that the electrode in the area of the medium to be measured is exposed to a thin-walled dielectric Ge housing is enclosed.
DE19914135046 1990-09-19 1991-10-24 Coated electrode for sensor for detection of dielectric properties - is used with fluid, gas-form and/or pourable media and comprises outer and inner conductors forming capacitor enclosed in e.g. dielectric plastic layer Ceased DE4135046A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19914135046 DE4135046A1 (en) 1990-09-19 1991-10-24 Coated electrode for sensor for detection of dielectric properties - is used with fluid, gas-form and/or pourable media and comprises outer and inner conductors forming capacitor enclosed in e.g. dielectric plastic layer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904029667 DE4029667A1 (en) 1990-08-02 1990-09-19 Electrode to monitor brake fluid condition - is used in motor vehicles and has external and internal electrodes forming condenser
DE19914135046 DE4135046A1 (en) 1990-09-19 1991-10-24 Coated electrode for sensor for detection of dielectric properties - is used with fluid, gas-form and/or pourable media and comprises outer and inner conductors forming capacitor enclosed in e.g. dielectric plastic layer

Publications (1)

Publication Number Publication Date
DE4135046A1 true DE4135046A1 (en) 1993-04-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19914135046 Ceased DE4135046A1 (en) 1990-09-19 1991-10-24 Coated electrode for sensor for detection of dielectric properties - is used with fluid, gas-form and/or pourable media and comprises outer and inner conductors forming capacitor enclosed in e.g. dielectric plastic layer

Country Status (1)

Country Link
DE (1) DE4135046A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19755418A1 (en) * 1997-12-12 1999-06-24 Fraunhofer Ges Forschung Sensor measuring complex impedances
EP1010976A2 (en) * 1998-12-11 2000-06-21 Sita Messtechnik GmbH Non-contact measuring device of the specific conductivity of electrolytic solutions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19755418A1 (en) * 1997-12-12 1999-06-24 Fraunhofer Ges Forschung Sensor measuring complex impedances
EP1010976A2 (en) * 1998-12-11 2000-06-21 Sita Messtechnik GmbH Non-contact measuring device of the specific conductivity of electrolytic solutions
EP1010976A3 (en) * 1998-12-11 2000-06-28 Sita Messtechnik GmbH Non-contact measuring device of the specific conductivity of electrolytic solutions

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