DE102014104983A1 - level sensor - Google Patents
level sensor Download PDFInfo
- Publication number
- DE102014104983A1 DE102014104983A1 DE102014104983.7A DE102014104983A DE102014104983A1 DE 102014104983 A1 DE102014104983 A1 DE 102014104983A1 DE 102014104983 A DE102014104983 A DE 102014104983A DE 102014104983 A1 DE102014104983 A1 DE 102014104983A1
- Authority
- DE
- Germany
- Prior art keywords
- cartridge
- receiver
- transmitter
- received signal
- level
- 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- Withdrawn
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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
- G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2961—Acoustic waves for discrete levels
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Ein Füllstandsensor zum Erfassen des Füllstands einer Kartusche umfasst eine Ultraschallschranke mit einem Sender und einem Empfänger, die jeweils mit einem Haltemittel einander gegenüberliegend an die Außenwandung der Kartusche anlegbar sind.A fill level sensor for detecting the fill level of a cartridge comprises an ultrasound barrier with a transmitter and a receiver, each of which can be placed opposite a holding means on the outer wall of the cartridge.
Description
Die vorliegende Erfindung betrifft einen Füllstandsensor für Kartuschen.The present invention relates to a level sensor for cartridges.
Der Füllstand von Kartuschen wird üblicherweise durch optische Sensoren gemessen oder durch Tastsensoren, die einen in der Flüssigkeit schwimmenden Kolben verfolgen. Beide Verfahren sind nicht zuverlässig. Für eine automatische Dosierung aus einer Kartusche ist aber eine zuverlässige Füllstandssensorik notwendig. Oft ist es hinreichend, wenn ein eindeutiges Signal bei einem geringen Füllstand gegeben wird. Wie viel an Inhalt noch aus der Kartusche entnommen werden kann, kann dann errechnet werden.The level of cartridges is usually measured by optical sensors or by tactile sensors tracking a piston floating in the fluid. Both methods are not reliable. For an automatic dosage from a cartridge but a reliable level sensor is necessary. Often it is sufficient if a clear signal is given at a low level. How much of the content can still be taken from the cartridge can then be calculated.
Erfindungsgemäß erfolgt die Messung des Füllstandes einer Kartusche mit einer Ultraschallschranke.
Wie
Erfindungsgemäß ist hierzu eine (nicht dargestellte) Auswerteeinrichtung vorgesehen, mit der die Amplitude des von dem Empfänger
Wenn andererseits der Pegelstand noch nicht so weit abgesunken ist, empfängt der Empfänger
Je nach Art des Mediums innerhalb der Kartusche kann es auch von Interesse sein, den Aggregatszustand bzw. die Dichte oder auch die Temperatur des Mediums in der Kartusche festzustellen. Wenn es sich bei dem Medium beispielsweise um Heißleim handelt, so kann durch Auswerten der Laufzeit des Ultraschallsignals auf die Dichte des Heißleims geschlossen werden und es kann festgestellt werden, ob dieser noch flüssig ist oder sich bereits verfestigt hat. Wenn das Medium innerhalb der Kartusche bekannt ist, kann auch aus der Laufzeit auf die Temperatur des Mediums in der Kartusche rückgeschlossen werden, da die Schallgeschwindigkeit auch temperaturabhängig ist. Depending on the nature of the medium within the cartridge, it may also be of interest to determine the state of aggregation or the density or even the temperature of the medium in the cartridge. If the medium is, for example, hot glue, then the density of the hot glue can be determined by evaluating the transit time of the ultrasonic signal and it can be determined whether it is still liquid or has already solidified. If the medium within the cartridge is known, it is also possible to deduce the temperature of the medium in the cartridge from the transit time since the speed of sound is also temperature-dependent.
In den
Die Schalllaufzeit beträgt 17 µs. Dies entspricht einer Schallgeschwindigkeit von 1500 m/s.The sound propagation time is 17 μs. This corresponds to a speed of sound of 1500 m / s.
Im unteren Graphen befindet sich kein Wasser mehr zwischen Sender und Empfänger.In the lower graph there is no more water between transmitter and receiver.
In
Zwischen Sender und Empfänger befindet sich jetzt flüssiger Heißleim. Die Laufzeit des Signals beträgt 22 µs. Dies entspricht einer Schallgeschwindigkeit von 1180 m/s. Between sender and receiver is now liquid hot glue. The duration of the signal is 22 μs. This corresponds to a speed of sound of 1180 m / s.
In dem unteren Graphen befindet sich kein Heißleim mehr zwischen Sender und Empfänger.In the lower graph there is no more hot melt between transmitter and receiver.
In
Es lässt sich also durch die Amplitude des Signals eindeutig feststellen, ob innerhalb der Kartusche Medium zwischen Sender und Empfänger vorhanden ist. Durch die Laufzeit kann festgestellt werden, ob das Medium flüssig oder fest ist. Selbst die Temperatur lässt sich durch die Laufzeit noch ermitteln, wenn das Medium bekannt ist, da die Schallgeschwindigkeit auch temperaturabhängig ist.Thus, it can be clearly determined by the amplitude of the signal, whether there is medium between transmitter and receiver within the cartridge. Through the runtime can be determined whether the medium is liquid or solid. Even the temperature can be determined by the running time, if the medium is known, since the speed of sound is also temperature-dependent.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014104983.7A DE102014104983A1 (en) | 2014-04-08 | 2014-04-08 | level sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014104983.7A DE102014104983A1 (en) | 2014-04-08 | 2014-04-08 | level sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102014104983A1 true DE102014104983A1 (en) | 2015-10-08 |
Family
ID=54146269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102014104983.7A Withdrawn DE102014104983A1 (en) | 2014-04-08 | 2014-04-08 | level sensor |
Country Status (1)
Country | Link |
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DE (1) | DE102014104983A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019052888A (en) * | 2017-09-13 | 2019-04-04 | 日機装株式会社 | Liquid detector |
EP3710795B1 (en) * | 2017-11-17 | 2024-04-03 | Hochschule für angewandte Wissenschaften Fachhochschule Coburg | Device and method for detecting deposition layers in a conduit conducting a liquid or a soft medium and/or for level detection |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4019436A1 (en) * | 1989-10-25 | 1991-05-02 | Renate Fehrenbach | Monitoring supply and level of infusion liq. from patient - applying sensor arrangement responding to liq. with threshold value alarm and connected to evaluation circuit |
US5438868A (en) * | 1993-11-01 | 1995-08-08 | Zevex, Inc. | Noninvasive ultrasonic liquid level indicator |
WO1999065818A1 (en) * | 1998-06-17 | 1999-12-23 | Isoworth Uk Limited | Drink dispenser, concentrate detector, and concentrate container |
GB2498952A (en) * | 2012-01-31 | 2013-08-07 | Coltraco Ltd | Monitoring liquid levels within a vessel using ultrasonic echo |
-
2014
- 2014-04-08 DE DE102014104983.7A patent/DE102014104983A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4019436A1 (en) * | 1989-10-25 | 1991-05-02 | Renate Fehrenbach | Monitoring supply and level of infusion liq. from patient - applying sensor arrangement responding to liq. with threshold value alarm and connected to evaluation circuit |
US5438868A (en) * | 1993-11-01 | 1995-08-08 | Zevex, Inc. | Noninvasive ultrasonic liquid level indicator |
WO1999065818A1 (en) * | 1998-06-17 | 1999-12-23 | Isoworth Uk Limited | Drink dispenser, concentrate detector, and concentrate container |
GB2498952A (en) * | 2012-01-31 | 2013-08-07 | Coltraco Ltd | Monitoring liquid levels within a vessel using ultrasonic echo |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019052888A (en) * | 2017-09-13 | 2019-04-04 | 日機装株式会社 | Liquid detector |
EP3710795B1 (en) * | 2017-11-17 | 2024-04-03 | Hochschule für angewandte Wissenschaften Fachhochschule Coburg | Device and method for detecting deposition layers in a conduit conducting a liquid or a soft medium and/or for level detection |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R163 | Identified publications notified | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |