DE4024554A1 - Sensor for detecting dielectric properties and their changes - has electrode, RC generator, PLL filter and evaluation unit - Google Patents

Sensor for detecting dielectric properties and their changes - has electrode, RC generator, PLL filter and evaluation unit

Info

Publication number
DE4024554A1
DE4024554A1 DE19904024554 DE4024554A DE4024554A1 DE 4024554 A1 DE4024554 A1 DE 4024554A1 DE 19904024554 DE19904024554 DE 19904024554 DE 4024554 A DE4024554 A DE 4024554A DE 4024554 A1 DE4024554 A1 DE 4024554A1
Authority
DE
Germany
Prior art keywords
filter
generator
sensor
dielectric properties
electrode
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.)
Withdrawn
Application number
DE19904024554
Other languages
German (de)
Inventor
Udo Jarisch
Kurt 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
Telefunken Systemtechnik 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
Application filed by Telefunken Systemtechnik AG filed Critical Telefunken Systemtechnik AG
Priority to DE19904024554 priority Critical patent/DE4024554A1/en
Priority to DE19904029667 priority patent/DE4029667A1/en
Publication of DE4024554A1 publication Critical patent/DE4024554A1/en
Withdrawn legal-status Critical Current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

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

Abstract

The sensor detects dielectric properties and their relative changes of liquid, gaseous and/or bulk materials. An electrode (11) is connected to an RC generator (20) which is connected to a filter (30). The filter is connected to an evaluation unit (40) with a display. The filter is a passive and/or active type and can be a Phase Locked Loop. USE/ADVANTAGE - E.g. for on-board measuring of quantity and/or quality of motor vehicle brake fluid. The sensor can detect the state of diverse types of media.

Description

Die Erfindung betrifft einen Sensor zur Detektion der di­ elektrischen Eigenschaften, sowie der relativen Änderungen dieser dielektrischen Eigenschaften von Flüssigkeiten, gasförmigen und/oder schüttfähigen Medien gemäß dem Ober­ begriff des Patentanspruches 1.The invention relates to a sensor for detecting the di electrical properties, as well as the relative changes these dielectric properties of liquids, gaseous and / or pourable media according to the Ober Concept of claim 1.

Die Erfindung der genannten Art wird u. a. zur Messung der Qualität und der Menge von Bremsflüssigkeiten eingesetzt und kommt daher im Kfz-Bereich zur Anwendung.The invention of the type mentioned u. a. to measure the Quality and amount of brake fluids used and is therefore used in the automotive sector.

Der Erfindung liegt die Aufgabe zugrunde, eine Anordnung der eingangs genannten Art zu realisieren, mittels welcher der Zustand von diversen Medien detektierbar ist. Zu die­ sen Medien gehören z. B. Bremsflüssigkeiten.The invention has for its object an arrangement to implement the type mentioned above, by means of which the condition of various media is detectable. To the  sen media include z. B. brake fluids.

Die erfindungsgemäße Lösung dieser Aufgabe sowie ihre ent­ sprechenden Weiterbildungen sollen leicht herstellbar, preiswert und materialsparend ausfallen.The inventive solution to this problem and its ent speaking further training should be easy to manufacture, turn out to be inexpensive and material-saving.

Die erfindungsgemäße Lösung der Aufgabe ist in dem Pa­ tentanspruch 1 beschrieben. In den Unteransprüchen sind vorteilhafte Aus- und Weiterbildungen sowie bevorzugte An­ wendungen der Erfindung aufgeführt.The achievement of the object is described in Pa tent Claim 1 . In the subclaims, advantageous training and further developments and preferred applications of the invention are listed.

Der erfindungsgemäße Lösungsgedanke besteht darin, daß eine kapazitive Meßsonde 11 in ein zu untersuchendes Me­ dium 10 hineinragt und je nach Zustand bzw. Zustandsände­ rung der Mediums 10 einen Generator 20 frequenzmäßig be­ stimmt. Mittels vorzugsweise einer PLL die als Filter 30 wirkt, liegt die generierte Schwingung im Fangbereich die­ ses Filters 30 oder außerhalb des Fangbereiches, wodurch auf die Eigenschaften des Mediums 10 Rückschlüsse gezogen werden können. So ist z. B. der Filter 30 derart einstell­ bar, daß mit zunehmenden Wassergehalt beispielsweise einer Bremsflüssigkeit, die generierte Frequenz im Genrator 20 aus dem Fangbereich des Filters 30 herauswandert, was in der Auswertung mit Anzeige 40 z. B. in einer PKW-Fahrgast­ zelle oder in einem Bordrechner zur Anzeige gebracht wer­ den kann bzw. bei späteren Inspektionen aus dem Bordrech­ ner dem Servicepersonal angezeigt wird.The solution idea of the invention is that a capacitive measuring probe 11 projects into a subject to be examined Me dium and 10 depending on the condition or Zustandsände 10 tion of the medium a generator 20 true frequency-be. By means of a PLL, which acts as a filter 30 , the generated vibration lies in the capture area of this filter 30 or outside the capture area, so that conclusions can be drawn about the properties of the medium 10 . So z. B. the filter 30 so adjustable bar that with increasing water content, for example a brake fluid, the generated frequency in the genrator 20 migrates out of the capture range of the filter 30 , which in the evaluation with display 40 z. B. in a passenger car cell or displayed in an on-board computer who can or who is displayed during later inspections from the on-board computer ner to the service personnel.

Ein weiterer Vorteil besteht darin, daß die gefundene Lö­ sung leicht herstellbar, preiswerter und materialsparend ausfällt und die Aufgabenstellung in vollem Umfang er­ füllt. Another advantage is that the Lö found solution is easy to manufacture, cheaper and saves material fails and the task in full fills.  

Im folgenden wird die Erfindung anhand von Fig. 1 näher erläutert. Es zeigen:The invention is explained in more detail below with reference to FIG. 1. Show it:

Fig. 1 die (Draufsicht) einer vorteilhafte Ausführungs­ form der erfindungsgemäßen Anordnung. Fig. 1 shows the (top view) of an advantageous embodiment of the arrangement according to the invention.

Die erfindungsgemäße Anordnung nach Fig. 1 ist ausgebildet aus einer Elektrode 11, die auf einen Generator 20 der auf einen Filter 30 und welcher auf eine Auswertung mit An­ zeige 40 aufgeschaltet ist.The arrangement according to the invention according to FIG. 1 is formed from an electrode 11 which is connected to a generator 20 which is connected to a filter 30 and which is connected to an evaluation with 40 .

Der Generator 20 ist vorzugsweise als ein RC-Generator ausgebildet.The generator 20 is preferably designed as an RC generator.

Das Filter 30 ist passiv und/oder aktiv ausgebildet. Das Filter 30 ist vorzugsweise ein PLL.The filter 30 is passive and / or active. The filter 30 is preferably a PLL.

Durch die Ausbildung der Erfindung gemäß obiger Beschrei­ bung, stellen sich die bereits oben eingangs genannten Vorteile ein.By designing the invention as described above exercise, imagine the ones already mentioned above Advantages.

Claims (4)

1. Sensor zur Detektion der dielektrischen Eigenschaften, sowie der relativen Änderungen dieser dielektrischen Ei­ genschaften von flüssigen, gasförmigen und/oder schüttfähi­ gen Medien, dadurch gekennzeichnet, daß eine Elektrode (11) an einen Generator (20) und dieser Generator (20) an einen Filter (30) und dieser Filter (30) an einer Auswer­ tung mit Anzeige (40) ausgebildet ist.1. Sensor for the detection of the dielectric properties and the relative changes of these dielectric properties of liquid, gaseous and / or pourable media, characterized in that an electrode ( 11 ) to a generator ( 20 ) and this generator ( 20 ) a filter ( 30 ) and this filter ( 30 ) is formed on an evaluation device with a display ( 40 ). 2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Generator (20) als ein RC-Generator ausgebildet ist.2. Arrangement according to claim 1, characterized in that the generator ( 20 ) is designed as an RC generator. 3. Anordnung nach Anspruch 2, dadurch gekennzeichnet, daß das Filter (30) passiv und/oder aktiv ausgebildet ist. 3. Arrangement according to claim 2, characterized in that the filter ( 30 ) is passive and / or active. 4. Anordnung nach Anspruch 3, dadurch gekennzeichnet, daß das Filter (30) eine PLL ist.4. Arrangement according to claim 3, characterized in that the filter ( 30 ) is a PLL.
DE19904024554 1990-08-02 1990-08-02 Sensor for detecting dielectric properties and their changes - has electrode, RC generator, PLL filter and evaluation unit Withdrawn DE4024554A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19904024554 DE4024554A1 (en) 1990-08-02 1990-08-02 Sensor for detecting dielectric properties and their changes - has electrode, RC generator, PLL filter and evaluation unit
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

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904024554 DE4024554A1 (en) 1990-08-02 1990-08-02 Sensor for detecting dielectric properties and their changes - has electrode, RC generator, PLL filter and evaluation unit

Publications (1)

Publication Number Publication Date
DE4024554A1 true DE4024554A1 (en) 1992-02-06

Family

ID=6411520

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19904024554 Withdrawn DE4024554A1 (en) 1990-08-02 1990-08-02 Sensor for detecting dielectric properties and their changes - has electrode, RC generator, PLL filter and evaluation unit

Country Status (1)

Country Link
DE (1) DE4024554A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19520021A1 (en) * 1995-05-31 1996-12-05 Umwelt Geraete Technik Gmbh Determining dielectric constants in mixture e.g. in arable soil or in liquid

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19520021A1 (en) * 1995-05-31 1996-12-05 Umwelt Geraete Technik Gmbh Determining dielectric constants in mixture e.g. in arable soil or in liquid

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