DE102009029099A1 - Filling level sensor has substrate and conductive path that is applied on substrate, where conductive path is covered by glass- or ceramic layer - Google Patents

Filling level sensor has substrate and conductive path that is applied on substrate, where conductive path is covered by glass- or ceramic layer Download PDF

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Publication number
DE102009029099A1
DE102009029099A1 DE200910029099 DE102009029099A DE102009029099A1 DE 102009029099 A1 DE102009029099 A1 DE 102009029099A1 DE 200910029099 DE200910029099 DE 200910029099 DE 102009029099 A DE102009029099 A DE 102009029099A DE 102009029099 A1 DE102009029099 A1 DE 102009029099A1
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Prior art keywords
substrate
glass
level sensor
conductive path
ceramic layer
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DE200910029099
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German (de)
Inventor
Jochen Stammler
Gustav Klett
Markus Niemann
Matthias Fischer
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to DE200910029099 priority Critical patent/DE102009029099A1/en
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    • 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
    • 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

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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

The filling level sensor has a substrate (1) and a conductive path (2) that is applied on the substrate. The conductive path is covered by a glass- or ceramic layer (3). The glass- or ceramic layer is manufactured from glass or ceramic.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem kapazitiven Füllstandssensor nach der Gattung des Hauptanspruchs.The invention relates to a capacitive level sensor according to the preamble of the main claim.

Es ist schon ein kapazitiver Füllstandssensor aus der US 5051921 B bekannt, mit einem Substrat und mindestens einer auf dem Substrat aufgebrachten Leiterbahn. Nachteilig ist, dass die Leiterbahnen beim Kontakt mit aggressiven Flüssigkeiten wie beispielsweise Kraftstoff korrodieren oder durch Belagbildungen verschmutzen können.It is already a capacitive level sensor from the US 5051921 B known, with a substrate and at least one applied on the substrate trace. The disadvantage is that the tracks can corrode on contact with aggressive fluids such as fuel or contaminate by deposits.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße kapazitive Füllstandssensor mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass eine Korrosion der Leiterbahn verhindert wird, indem die mindestens eine Leiterbahn von einer Glasschicht oder Keramikschicht überdeckt ist. Außerdem kann die Flüssigkeit nicht über einen Leckpfad zwischen dem Substrat und der Leiterbahn zur Auswerteelektronik vordringen und diese schädigen. Des weiteren ist bei der Kapazitätsmessung kein Kurzschluss über die Flüssigkeit möglich.The capacitive level sensor according to the invention with the characterizing features of the main claim has the advantage that corrosion of the conductor is prevented by the at least one conductor track is covered by a glass layer or ceramic layer. In addition, the liquid can not penetrate via a leakage path between the substrate and the conductor to the transmitter and damage them. Furthermore, in the capacitance measurement no short circuit on the liquid is possible.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Füllstandssensors möglich.The measures listed in the dependent claims advantageous refinements and improvements of the main claim level sensor are possible.

Besonders vorteilhaft ist, wenn die mindestens eine Leiterbahn eine Antennen- oder Interdigitalstruktur aufweist, da auf diese Weise die Füllstandsbestimmung kostengünstig, sehr einfach und präzise realisiert werden kann.It is particularly advantageous if the at least one conductor track has an antenna or interdigital structure, since in this way the fill level determination can be implemented cost-effectively, very simply and precisely.

Weiterhin vorteilhaft ist, wenn zwei zueinander beabstandete Leiterbahnen vorgesehen sind, da auf diese Weise größere Nutzsignale verfügbar sind.It is also advantageous if two interconnected conductor tracks are provided, since in this way larger useful signals are available.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.

1 zeigt einen erfindungsgemäßen Füllstandssensor und 1 shows a level sensor according to the invention and

2 eine Schnittansicht des erfindungsgemäßen Füllstandssensors nach 1. 2 a sectional view of the filling level sensor according to the invention 1 ,

Beschreibung des AusführungsbeispielsDescription of the embodiment

1 zeigt einen erfindungsgemäßen kapazitiven Füllstandssensor. 1 shows a capacitive level sensor according to the invention.

Der kapazitive Füllstandssensor 1 dient der Bestimmung eines Füllstands einer in einem Behälter enthaltenen Flüssigkeit. Der Füllstandssensor kann in einem Kraftstofftank zur Messung des Füllstandes eingesetzt werden, ist aber selbstverständlich auch für andere Anwendungen mit beliebigen Flüssigkeiten geeignet.The capacitive level sensor 1 is used to determine a level of a liquid contained in a container. The level sensor can be used in a fuel tank to measure the level, but is of course also suitable for other applications with any liquids.

Der Füllstandssensor weist ein Substrat 1 und zumindest eine auf dem Substrat 1 aufgebrachte Leiterbahn 2 auf. Das Substart 1 besteht beispielsweise aus Keramik oder Glas. Die Leiterbahn 2 besteht beispielsweise aus Silberpalladium (AgPd) oder anderen leitfähigen, für Leiterbahnen geeigneten Materialien und ist beispielsweise mittels einer Dickschicht- oder Dünnschichttechnik auf das Substrat aufgedruckt.The level sensor has a substrate 1 and at least one on the substrate 1 applied trace 2 on. The Substart 1 For example, it is made of ceramic or glass. The conductor track 2 consists for example of silver palladium (AgPd) or other conductive materials suitable for printed conductors and is printed, for example by means of a thick-film or thin-film technique on the substrate.

Damit die zumindest eine Leiterbahn 2 nicht von der Flüssigkeit angegriffen werden kann und sich keine schädlichen Beläge auf der Leiterbahn 2 bilden können, ist erfindungsgemäß vorgesehen, dass die mindestens eine Leiterbahn von einer Glas- oder Keramikschicht 3 überdeckt ist. Die Glas- oder Keramikschicht 3 besteht aus einem Glas, beispielsweise einem Isolier- oder Abdeckglas, oder aus einer Keramik und schließt die mindestens eine Leiterbahn 2 dicht ein. Sie ist auf dem Substrat 1 flächig aufgetragen.So that at least one trace 2 can not be attacked by the liquid and no harmful deposits on the trace 2 can form, is provided according to the invention, that the at least one conductor of a glass or ceramic layer 3 is covered. The glass or ceramic layer 3 consists of a glass, such as an insulating or cover glass, or of a ceramic and closes the at least one conductor track 2 tight. She is on the substrate 1 applied flat.

Die zumindest eine Leiterbahn 2 ist mit einer Auswerteelektronik 4 verbunden, die beispielsweise auf der der Leiterbahn 2 abgewandten Seite des Substrates 1 angeordnet ist. Der Füllstand wird mittels der Auswerteelektronik 4 ermittelt.The at least one track 2 is with an evaluation electronics 4 connected, for example, on the track 2 opposite side of the substrate 1 is arranged. The fill level is determined by the evaluation electronics 4 determined.

Gemäß dem Ausführungsbeispiel nach 1 sind zwei im wesentlichen parallel verlaufende, zueinander beabstandete Leiterbahnen 2 vorgesehen, die eine Antennen- oder Interdigitalstruktur haben können. Die Kapazität/Leitfähigkeit dieser Anordnung ergibt sich daher aus der Summe eines Kapazitäts- bzw. Leitfähigkeitsanteils, der als Dielektrikum/Leitwert die Flüssigkeit aufweist, und zwei Kapazitäts- bzw. Leitfähigkeitsanteilen, deren Dielektrikum/Leitwert die Glasschicht ist. Bei einer Änderung des Füllstands ist eine Änderung der Kapazität/Leitfähigkeit messbar.According to the embodiment according to 1 are two substantially parallel, spaced conductor tracks 2 provided that may have an antenna or interdigital structure. The capacitance / conductivity of this arrangement therefore results from the sum of a capacitance or conductivity component which has the liquid as the dielectric / conductance, and two capacitance or conductivity components whose dielectric / conductance is the glass layer. If the level changes, a change in capacitance / conductivity can be measured.

2 zeigt eine Schnittansicht des erfindungsgemäßen Füllstandssensors nach 1. 2 shows a sectional view of the fill level sensor according to the invention 1 ,

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • US 5051921 B [0002] US 5051921 B [0002]

Claims (6)

Füllstandssensor mit einem Substrat (1) und mindestens einer auf dem Substrat (1) aufgebrachten Leiterbahn (2), dadurch gekennzeichnet, dass die mindestens eine Leiterbahn (2) von einer Glas- oder Keramikschicht (3) überdeckt ist.Level sensor with a substrate ( 1 ) and at least one on the substrate ( 1 ) applied conductor track ( 2 ), characterized in that the at least one conductor track ( 2 ) of a glass or ceramic layer ( 3 ) is covered. Füllstandssensor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Glas- oder Keramikschicht (3) aus einem Glas oder einer Keramik hergestellt ist.Level sensor according to one of the preceding claims, characterized in that the glass or ceramic layer ( 3 ) is made of a glass or a ceramic. Füllstandssensor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Glas- oder Keramikschicht (3) die mindestens eine Leiterbahn dicht einschließt.Level sensor according to one of the preceding claims, characterized in that the glass or ceramic layer ( 3 ) which tightly encloses at least one conductor track. Füllstandssensor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Glas- oder Keramikschicht (3) flächig aufgetragen ist.Level sensor according to one of the preceding claims, characterized in that the glass or ceramic layer ( 3 ) is applied flat. Füllstandssensor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die mindestens eine Leiterbahn (2) eine Antennen- oder Interdigitalstruktur aufweist.Level sensor according to one of the preceding claims, characterized in that the at least one conductor track ( 2 ) has an antenna or interdigital structure. Füllstandssensor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Substrat (1) aus Keramik oder Glas hergestellt ist.Level sensor according to one of the preceding claims, characterized in that the substrate ( 1 ) is made of ceramic or glass.
DE200910029099 2009-09-02 2009-09-02 Filling level sensor has substrate and conductive path that is applied on substrate, where conductive path is covered by glass- or ceramic layer Withdrawn DE102009029099A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2685226A1 (en) 2012-07-11 2014-01-15 Eurocopter Deutschland GmbH Optical liquid level sensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5051921A (en) 1989-11-30 1991-09-24 David Sarnoff Research Center, Inc. Method and apparatus for detecting liquid composition and actual liquid level

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5051921A (en) 1989-11-30 1991-09-24 David Sarnoff Research Center, Inc. Method and apparatus for detecting liquid composition and actual liquid level

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2685226A1 (en) 2012-07-11 2014-01-15 Eurocopter Deutschland GmbH Optical liquid level sensor
US9116029B2 (en) 2012-07-11 2015-08-25 Airbus Helicopters Deutschland GmbH Optical liquid level sensor having a plurality of optical fibers

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