EP1252857A2 - Turbidity sensor for measuring turbidity in the washing liquid in a dishwasher - Google Patents
Turbidity sensor for measuring turbidity in the washing liquid in a dishwasher Download PDFInfo
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- EP1252857A2 EP1252857A2 EP02006143A EP02006143A EP1252857A2 EP 1252857 A2 EP1252857 A2 EP 1252857A2 EP 02006143 A EP02006143 A EP 02006143A EP 02006143 A EP02006143 A EP 02006143A EP 1252857 A2 EP1252857 A2 EP 1252857A2
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- light
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4297—Arrangements for detecting or measuring the condition of the washing water, e.g. turbidity
Definitions
- the invention relates to a turbidity sensor for detecting turbidity in the rinsing liquid a dishwasher, the sensor with several transmission channels for light with different light wavelengths and several receiving channels is formed, which different angles relative to the transmission channels in a ring shape around the washing liquid leading transparent guide tube are arranged around, with a receiving channel for transmitted light aligned with the transmission channel and another reception channel for 90 ° scattered light reception is arranged offset by 90 °.
- DE 41 22 988 A1 discloses a turbidity sensor for a dishwasher, which with one or more transmission channels for light of different light wavelengths and / or one or more receiving channels is designed for transmitted light and scattered light, the receiving channels each at a certain angle to the light transmitter Flow pipe are aligned around.
- a transmission channel works on two reception channels, one of which receives the transmission channel directly opposite lies and measures the continuous light, while the other channel measures the scattered light.
- the sensor thus supplies two separate signals, based on which a downstream computer calculates a quotient output from which a corresponding turbidity value is derived can be.
- B. green light with shorter Wavelength sends.
- the amount of red light received and the amount of received The proportion of green light is measured and from this the turbidity value is determined. Due to the wavelength difference, the relationship between red and green is in proportion set, both values being reduced as the density of the dirt particles increases becomes. If the density remains constant, the amount of light received is particularly high with red Light, small, when large particles or dirt residues float in the rinse water. If the size of the dirt particles is small, such as with oil, milk or the like emulsifying substances, the amount of light received is greater. From these findings and through one Corresponding comparison of values by the evaluating computer is the rinse water turbidity or the density of the dirt particles and their particle size can be estimated approximately. However, an estimated result is not sufficient for an effective wash program run.
- An electronic program-controlled dishwasher not shown, whose selectable Rinse programs each program sections, such as pre-rinsing, cleaning, intermediate rinsing, rinsing and have drying, depending on the determined degree of contamination of the loaded Dishes or the washing liquid in circulation pre-rinse and / or intermediate rinse cycles controlled or additionally controlled and temperatures and holding times adjusted has an optical sensor in the form of a turbidity sensor (1), which connected to the program control or the microcomputer of the device to predetermined At times in the aforementioned program sections, the turbidity of the rinsing liquid detects and delivers measurement signals corresponding to the determined degree of contamination. Depending on the signals given to the computer, the program control is influenced taken.
- the turbidity sensor (1) used works on the light barrier principle and consists of a transparent guide tube for the rinsing liquid to be sensed. At right angles to Guide tube (2) or to the flowing liquid is an optical measuring section (4) consisting of an optical transmitter (5), such as light-emitting diode, lamp or the like. and from optical receivers (6) such as phototransistors or the like.
- 1 is the optical transmitter (5) with several transmission channels (5a, 5b) for light with different light wavelengths ( ⁇ 1 , ⁇ 2 or general ⁇ x ) and with the turbidity sensor (1) for detecting turbidity in the rinsing liquid several receiving channels (6a to 6d) are formed.
- the individual receiving channels (6a to 6d) are arranged at different angles relative to the transmitting channels (5a, 5b) in a circle around the transparent guide tube (2) carrying the rinsing liquid (3).
- a receiving channel (6a) for transmitted light is directly opposite the light-transmitting channel (5; 5a, 5b), while another receiving channel (6b) for 90 ° scattered light reception is aligned offset by 90 ° to the light-transmitting channel (5).
- At least one of the light transmission channels (5a, 5b) is assigned a further reception channel (6c) for receiving scattered light of preferably less than 45 °.
- a light polarization filter (7) is assigned to a receiving channel for scattered light reception of 90 °, which is also provided and designated (6d) and which is directly opposite the other scattered light receiving channel (6b).
- the filter can also be assigned to any other reception channel (6) and / or the transmission channels (5).
- the polarization filter (7) polarizes the detected light beams linearly, elliptically or circularly.
- the turbidity sensor (1) works with two transmission channels (5a and 5b), which preferably emit short-wave blue light ⁇ 1 (blue LED) and long-wave infrared light ⁇ 2 (red LED).
- the two light transmission channels (5a, 5b) of the optical transmitter (5) are preferably arranged one below the other on the guide tube (2).
- only one transmitter LED of the optical transmitter (5) is shown in FIGS. 1 and 2 and is assigned to the aforementioned four light receiver channels (6a to 6d).
- the signals from the opacimeter (1) are evaluated by the microprocessor (not shown) of the household appliance (including zero adjustment), which in particular is the quotient Transmitted light ( ⁇ 1 ): transmitted light ( ⁇ 2 ) or D ( ⁇ 1 ): D ( ⁇ 2 ) and Scattered light ( ⁇ 1 ): transmitted light ( ⁇ 1 ) or S ( ⁇ 1 ): D ( ⁇ 1 ) and Scattered light ( ⁇ 1 ): transmitted light ( ⁇ 2 ) or S ( ⁇ 1 ): D ( ⁇ 2 ) forms.
- S ( ⁇ 1 ) denotes the voltage signal of the blue LED and S ( ⁇ 2 ) the signal of the red (infrared) LED.
- ⁇ x includes ⁇ 1 or ⁇ 2 .
- the signals S ( ⁇ x ) and D ( ⁇ x ) must be linearized as concentration-independent function coefficients.
- Further mathematical methods e.g. addition, subtraction, folding, integral calculation, differential calculation, etc.
- the methods of signal and system theory as well as statistics e.g. classification
- the signal curves typical of the different soiling can be analyzed.
- the turbidity sensor (1) with at least one light transmission channel (5a) and three light receiving channels for transmitted light (6a), 25 ° scattered light (6c) (Forward scatter) and 90 ° scattered light (6b).
- the primary light rays are polarized.
- the polarization filter (7) is in the Beam path of the transmission channel (5) arranged. It has been shown that with this variant low concentrations (e.g. milk) can be easily recognized. Come in the evaluation again the previously described mathematical methods for use.
- the polarization filter (7) can polarize again linearly, elliptically or circularly. Both in the embodiment 1 as well as in the example according to FIG. 2, or also according to FIG.
- the chosen static polarization filter (7) in the form of a mirror optic also through a electrically operated polarization rotator with an optical angle of rotation of 0 ° to 90 ° or be provided as an alternative solution.
- a "polarization filter” the polarization direction could be set continuously in a simple manner.
- FIGS. 1 and 2 show a construction variant of FIGS. 1 and 2, the guide tube (2) for the rinsing liquid (3) to be sensed essentially transversely to the light transmission channels (5a, 5b) and receiving channels (6a to 6c) is arranged.
- Light transmitter (5) and receiver (6) are thereby on the same level in which the measuring sections (4) are also identified Spread the scattering cone (8) of the emitted, reflected and polarized light beams from the diodes.
- the two light transmission channels (5a, 5b) for blue and red light are for transmitted light sensitive light receiving channel (6a) opposite, while the light receiving channel (6b) for 90 ° scattered light in the direction of flow of the rinsing liquid and the third light receiving channel (6c) for Scattered light (forward scatter) equal to or less than 45 °, preferably 25 °, by this angle offset from the light transmission channels (5a, 5b).
- the polarization filter (7) or the electrically operated polarization rotator is arranged in front of the two light transmission channels (5a, 5b).
- Turbidity sensor for the detection of particles only
- another turbidity sensor for the detection of emulsions, for example milk residues or the like in the rinsing water responsible is.
- a turbidity measurement based on the reflection principle would also be conceivable being a change in the refractive index of water or interference from particles on the Rinse water surface lead to a good result in case of rinsing liquid contamination likely.
Abstract
Description
Die Erfindung betrifft einen Trübungssensor zur Erkennung von Trübungen in der Spülflüssigkeit einer Geschirrspülmaschine, wobei der Sensor mit mehreren Sendekanälen für Licht mit unterschiedlichen Lichtwellenlängen und mehreren Empfangskanälen ausgebildet ist, die unter verschiedenen Winkeln relativ zu den Sendekanälen kreisringförmig um ein die Spülflüssigkeit führendes transparentes Leitrohr herum angeordnet sind, wobei ein Empfangskanal für Durchlicht gegenüber dem Sendekanal ausgerichtet und ein weiterer Empfangskanal für einen 90°-Streulichtempfang um 90° versetzt angeordnet ist.The invention relates to a turbidity sensor for detecting turbidity in the rinsing liquid a dishwasher, the sensor with several transmission channels for light with different light wavelengths and several receiving channels is formed, which different angles relative to the transmission channels in a ring shape around the washing liquid leading transparent guide tube are arranged around, with a receiving channel for transmitted light aligned with the transmission channel and another reception channel for 90 ° scattered light reception is arranged offset by 90 °.
Aus der DE 41 22 988 A1 ist ein Trübungssensor für eine Geschirrspülmaschine bekannt, welcher mit einem oder mehreren Sendekanälen für Licht unterschiedlicher Lichtwellenlängen und/oder einem oder mehreren Empfangskanälen für Durchlicht und Streulicht ausgebildet ist, wobei die Empfangskanäle jeweils unter einem bestimmten Winkel zum Lichtsender an einem Durchflussrohr herum ausgerichtet sind. Nach einem ersten Beispiel arbeitet ein Sendekanal auf zwei Empfangskanäle, von denen der eine Empfangskanal dem Sendekanal direkt gegenüber liegt und das durchgehende Licht misst, während der andere Kanal das Streulicht misst. Der Sensor liefert somit zwei separate Signale, anhand dieser ein nachgeschalteter Rechner einen Quotienten-Ausgang berechnet, aus dem ein entsprechender Trübungswert abgeleitet werden kann. Entsprechend einem zweiten Beispiel wird umgekehrt ein Empfangskanal von zwei winkelgleich zu einer Geraden untereinander angeordneten Sendekanäle bedient, von denen der eine langwelliges infrarotes Licht und der andere Kanal z. B. grünes Licht mit kürzerer Wellenlänge sendet. Die Menge an empfangenem roten Licht und die Menge des empfangenen Anteils von grünem Licht werden gemessen und daraus der Trübungswert bestimmt. Aufgrund der Wellenlängendifferenz wird die Beziehung Rotanteil zu Grünanteil ins Verhältnis gesetzt, wobei beide Werte vermindert werden, wenn die Dichte der Schmutzpartikel erhöht wird. Bleibt die Dichte konstant, ist die Menge des empfangenen Lichtes, insbesondere bei rotem Licht, klein, wenn große Teilchen bzw. Schmutzreste im Spülwasser schwimmen. Wenn die Größe der Schmutzpartikel klein ist, wie bei Öl, Milch oder dergl. emulgierenden Substanzen, ist die Menge des empfangenen Lichtes größer. Aus diesen Erkenntnissen und durch einen entsprechenden Wertevergleich durch den auswertenden Rechner ist die Spülwassertrübung bzw. die Dichte der Schmutzpartikel und deren Teilchengröße annähernd abschätzbar. Ein abgeschätztes Ergebnis ist jedoch für einen wirksamen Spülprogrammlauf nicht ausreichend. DE 41 22 988 A1 discloses a turbidity sensor for a dishwasher, which with one or more transmission channels for light of different light wavelengths and / or one or more receiving channels is designed for transmitted light and scattered light, the receiving channels each at a certain angle to the light transmitter Flow pipe are aligned around. According to a first example, a transmission channel works on two reception channels, one of which receives the transmission channel directly opposite lies and measures the continuous light, while the other channel measures the scattered light. The sensor thus supplies two separate signals, based on which a downstream computer calculates a quotient output from which a corresponding turbidity value is derived can be. According to a second example, a reception channel of served two transmission channels arranged at an angle to each other to form a straight line, from which the one long-wave infrared light and the other channel z. B. green light with shorter Wavelength sends. The amount of red light received and the amount of received The proportion of green light is measured and from this the turbidity value is determined. Due to the wavelength difference, the relationship between red and green is in proportion set, both values being reduced as the density of the dirt particles increases becomes. If the density remains constant, the amount of light received is particularly high with red Light, small, when large particles or dirt residues float in the rinse water. If the size of the dirt particles is small, such as with oil, milk or the like emulsifying substances, the amount of light received is greater. From these findings and through one Corresponding comparison of values by the evaluating computer is the rinse water turbidity or the density of the dirt particles and their particle size can be estimated approximately. However, an estimated result is not sufficient for an effective wash program run.
Aus der DE 198 06 559 A1 ist ein Verfahren und eine entsprechende Anordnung zur Behandlung von Geschirr in Geschirrspülmaschinen bekannt, bei dem genauere Daten über die Verschmutzungsanteile dadurch gewonnen werden, dass in die zu erfassende Strahlungsmenge auch das Streulicht gewertet wird, welches um exakt 90° versetzt gegenüber dem emittierten Licht des Sendekanals das Durchflussrohr durchdringt. Für eine optimale Bestimmung der Verschmutzung von Spülflüssigkeit, insbesondere der Analyse einer Kombianschmutzung (Partikelart und Trübung) reicht auch diese Methode nicht aus. Auch hier soll die Erfindung Abhilfe schaffen.DE 198 06 559 A1 describes a method and a corresponding arrangement for treatment of dishes in dishwashers known, in which more accurate data on the levels of contamination can be obtained in that the amount of radiation to be detected the scattered light is also evaluated, which is offset by exactly 90 ° with respect to the emitted Light from the transmission channel penetrates the flow tube. For an optimal determination of the pollution of rinsing liquid, in particular the analysis of combination soiling (Particle type and turbidity) this method is also not sufficient. The invention is also intended to remedy this create.
Erfindungsgemäß wird dieses Problem mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.According to the invention, this problem is solved with the features of patent claim 1. Advantageous refinements and developments of the invention result from the following Dependent claims.
Die mit der Erfindung erreichbaren Vorteile sind insbesondere darin zu sehen, dass durch Einbeziehung aller möglichen Streulicht- und auch Lichtpolarisationskomponenten bei der Trübungsmessung eine exaktere Bestimmung der Spülwasserverunreinigung, insbesondere auch eine Analyse von Kombianschmutzungen nach Art und Bestandteilen der Verunreinigungen (sog. "Fingerprints") durchführbar ist, so dass ein Spülprogrammlauf hinsichtlich Wasserwechsel, Reinigerzugabe, Programmlaufzeit, Temperatureinstellungen usw. optimiert werden kann.The advantages achievable with the invention can be seen in particular in that by inclusion all possible stray light and light polarization components for turbidity measurement a more precise determination of the rinse water contamination, in particular also an analysis of combined soiling according to the type and components of the impurities (so-called "fingerprints") can be carried out, so that a rinsing program run with regard to water changes, Addition of detergent, program duration, temperature settings etc. can be optimized.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen rein schematisch dargestellt und werden nachfolgend näher beschrieben. Es zeigt
- Figur 1
- einen Trübungssensor in der Draufsicht in schematischer Darstellung mit Licht-Sendekanälen und zugeordneten Licht-Empfangskanälen sowie mit einem Polarisationsfilter, nach einem ersten Ausführungsbeispiel,
Figur 2- den Trübungssensor gemäß einem weiteren Ausführungsbeispiel,
Figur 3- einen Trübungssensor im Strömungsweg einer Spülflüssigkeit, gemäß einem dritten Ausführungsbeispiel als Konstruktionsvariante zu Fig. 1 und 2, in schematischer Darstellung.
- Figure 1
- a turbidity sensor in plan view in a schematic representation with light transmission channels and associated light reception channels and with a polarization filter, according to a first embodiment,
- Figure 2
- the turbidity sensor according to a further exemplary embodiment,
- Figure 3
- a turbidity sensor in the flow path of a rinsing liquid, according to a third embodiment as a construction variant of FIGS. 1 and 2, in a schematic representation.
Eine nicht gezeigte elektronisch programmgesteuerte Geschirrspülmaschine, deren anwählbare Spülprogramme jeweils Programmabschnitte, wie Vorspülen, Reinigen, Zwischenspülen, Klarspülen und Trocknen aufweisen, wobei je nach festgestelltem Verschmutzungsgrad des geladenen Geschirrs bzw. der im Umlauf befindlichen Spülflüssigkeit Vorspül- und/oder Zwischenspülgänge aus- oder zusätzlich eingesteuert und Temperaturen und Haltezeiten angepasst werden können, weist einen optischen Sensor in Form eines Trübungssensors (1) auf, welcher mit der Programmsteuerung bzw. dem Mikrocomputer des Gerätes verbunden zu vorgegebenen Zeitpunkten in den vorerwähnten Programmabschnitten jeweils die Trübung der Spülflüssigkeit feststellt und den ermittelten Verschmutzungsgraden entsprechende Mess-Signale liefert. Abhängig von den an den Rechner gegebenen Signalen wird Einfluss auf die Programmsteuerung genommen.An electronic program-controlled dishwasher, not shown, whose selectable Rinse programs each program sections, such as pre-rinsing, cleaning, intermediate rinsing, rinsing and have drying, depending on the determined degree of contamination of the loaded Dishes or the washing liquid in circulation pre-rinse and / or intermediate rinse cycles controlled or additionally controlled and temperatures and holding times adjusted has an optical sensor in the form of a turbidity sensor (1), which connected to the program control or the microcomputer of the device to predetermined At times in the aforementioned program sections, the turbidity of the rinsing liquid detects and delivers measurement signals corresponding to the determined degree of contamination. Depending on the signals given to the computer, the program control is influenced taken.
Der eingesetzte Trübungssensor (1) arbeitet nach dem Lichtschrankenprinzip und besteht aus einem transparenten Leitrohr für die zu sensierende Spülflüssigkeit. Im rechten Winkel zum Leitrohr (2) bzw. zur strömenden Flüssigkeit ist eine optische Messstrecke (4) bestehend aus einem optischen Sender (5), wie Leuchtdiode, Lampe oder dergl. und aus optischen Empfängern (6), wie Fototransistoren oder dergl. aufgebaut. Ausgewertet wird die durch die Trübung verursachte Dämpfung des Lichtes innerhalb der Messstrecken (4), wobei durch die erfindungsgemäße Einbeziehung sämtlicher Streulichtkomponenten mit/ohne Polarisation des Streulichtes bei der Trübungsmessung eine exakte Bestimmung der Spülwasserverunreinigung, insbesondere aber eine Analyse von Kombianschmutzungen (sog. "Fingerprints" oder bestimmte typische Verschmutzungen bzw. Schmutzpartikel) nach Art und Bestandteilen der Verunreinigungen durchführbar ist. Dadurch ist der Spülprogrammlauf hinsichtlich Wasserwechsel, Reinigerzugabe, Programmlaufzeit, Temperatureinstellungen usw. optimierbar. Hierzu sind auch die Licht-Sendekanäle sowie zugeordnete Licht-Empfangskanäle des Trübungssensors (1) zueinander entsprechend auszurichten, wie der nachfolgenden Beschreibung zu entnehmen ist.The turbidity sensor (1) used works on the light barrier principle and consists of a transparent guide tube for the rinsing liquid to be sensed. At right angles to Guide tube (2) or to the flowing liquid is an optical measuring section (4) consisting of an optical transmitter (5), such as light-emitting diode, lamp or the like. and from optical receivers (6) such as phototransistors or the like. It is evaluated by the cloudiness caused attenuation of the light within the measuring sections (4), with the inventive Inclusion of all stray light components with / without polarization of the Scattered light during turbidity measurement an exact determination of the rinsing water contamination, in particular, however, an analysis of combination soiling (so-called "fingerprints" or certain typical soiling or dirt particles) according to the type and components of the Contamination is feasible. This makes the rinse program run regarding water change, Addition of detergent, program duration, temperature settings etc. can be optimized. For this are also the light transmission channels and assigned light reception channels of the turbidity sensor (1) to align each other accordingly, as can be seen in the following description is.
Gemäß Fig. 1 ist beim Trübungssensor (1) zur Erkennung von Trübungen in der Spülflüssigkeit der optische Sender (5) mit mehreren Sendekanälen (5a, 5b) für Licht mit unterschiedlichen Lichtwellenlängen (λ1, λ2 oder allg. λx) und mit mehreren Empfangskanälen (6a bis 6d) ausgebildet. Die einzelnen Empfangskanäle (6a bis 6d) sind unter verschiedenen Winkeln relativ zu den Sendekanälen (5a, 5b) kreisförmig um das die Spülflüssigkeit (3) führende transparente Leitrohr (2) herum angeordnet. Dabei liegt ein Empfangskanal (6a) für Durchlicht dem Licht-Sendekanal (5; 5a, 5b) direkt gegenüber, während ein weiterer Empfangskanal (6b) für einen 90°-Streulichtempfang zum Licht-Sendekanal (5) um 90° versetzt ausgerichtet ist. Erfindungsgemäß ist mindestens einem der Licht-Sendekanäle (5a, 5b) ein weiterer Empfangskanal (6c) für den Empfang von Streulicht von vorzugsweise kleiner als 45° zugeordnet. Einem weiterhin vorgesehenen und mit (6d) bezeichneten Empfangskanal für Streulichtempfang von 90°, welchem der andere Streulicht-Empfangskanal (6b) direkt gegenüberliegt, ist ein Licht-Polarisationsfilter (7) zugeordnet. Das Filter kann auch jedem anderen Empfangskanal (6) und/oder den Sendekanälen (5) zugeordnet werden. Das Polarisationsfilter (7) polarisiert die erfassten Lichtstrahlen linear, elliptisch oder zirkular.1 is the optical transmitter (5) with several transmission channels (5a, 5b) for light with different light wavelengths (λ 1 , λ 2 or general λ x ) and with the turbidity sensor (1) for detecting turbidity in the rinsing liquid several receiving channels (6a to 6d) are formed. The individual receiving channels (6a to 6d) are arranged at different angles relative to the transmitting channels (5a, 5b) in a circle around the transparent guide tube (2) carrying the rinsing liquid (3). A receiving channel (6a) for transmitted light is directly opposite the light-transmitting channel (5; 5a, 5b), while another receiving channel (6b) for 90 ° scattered light reception is aligned offset by 90 ° to the light-transmitting channel (5). According to the invention, at least one of the light transmission channels (5a, 5b) is assigned a further reception channel (6c) for receiving scattered light of preferably less than 45 °. A light polarization filter (7) is assigned to a receiving channel for scattered light reception of 90 °, which is also provided and designated (6d) and which is directly opposite the other scattered light receiving channel (6b). The filter can also be assigned to any other reception channel (6) and / or the transmission channels (5). The polarization filter (7) polarizes the detected light beams linearly, elliptically or circularly.
Der Trübungssensor (1) arbeitet wie erwähnt mit zwei Sendekanälen (5a und 5b), die vorzugsweise kurzwelliges blaues Licht λ1 (blaue LED) und langwelliges infrarotes Licht λ2 (rote LED) emittieren. Die beiden Lichtsendekanäle (5a, 5b) des optischen Senders (5) sind vorzugsweise untereinanderliegend am Leitrohr (2) angeordnet. Der besseren Übersicht halber ist in den Fig. 1, 2 jedoch nur eine Sende-LED des optischen Senders (5) gezeigt und den vorerwähnten vier Licht-Empfängerkanälen (6a bis 6d) zugeordnet.As mentioned, the turbidity sensor (1) works with two transmission channels (5a and 5b), which preferably emit short-wave blue light λ 1 (blue LED) and long-wave infrared light λ 2 (red LED). The two light transmission channels (5a, 5b) of the optical transmitter (5) are preferably arranged one below the other on the guide tube (2). For the sake of a better overview, however, only one transmitter LED of the optical transmitter (5) is shown in FIGS. 1 and 2 and is assigned to the aforementioned four light receiver channels (6a to 6d).
Die Signale des Trübungsmessers (1) werden vom nicht dargestellten Mikroprozessor des
Haushaltgerätes ausgewertet (u. a. Nullpunktabgleich), der insbesondere die Quotienten
Durchlicht (λ1) : Durchlicht (λ2) oder D(λ1) : D(λ2)
und
Streulicht (λ1) : Durchlicht (λ1) oder S(λ1) : D(λ1)
und
Streulicht (λ1) : Durchlicht (λ2) oder S(λ1) : D(λ2)
bildet. Dabei bedeuten S(λx) = abgeglichenes Spannungssignal im Streulichtkanal und D(λx) =
abgeglichenes Spannungssignal im Durchlichtkanal in Abhängigkeit der Lichtwellenlänge (LED-Farbe).
S(λ1) kennzeichnet das Spannungssignal der blauen LED und S(λ2) das Signal der
roten (infraroten) LED. λx beinhaltet λ1 oder λ2.The signals from the opacimeter (1) are evaluated by the microprocessor (not shown) of the household appliance (including zero adjustment), which in particular is the quotient
Transmitted light (λ 1 ): transmitted light (λ 2 ) or D (λ 1 ): D (λ 2 )
and
Scattered light (λ 1 ): transmitted light (λ 1 ) or S (λ 1 ): D (λ 1 )
and
Scattered light (λ 1 ): transmitted light (λ 2 ) or S (λ 1 ): D (λ 2 )
forms. S (λ x ) = balanced voltage signal in the scattered light channel and D (λ x ) = balanced voltage signal in the transmitted light channel depending on the light wavelength (LED color). S (λ 1 ) denotes the voltage signal of the blue LED and S (λ 2 ) the signal of the red (infrared) LED. λ x includes λ 1 or λ 2 .
Des weiteren können alle weiteren denkbaren Kombinationen ausgewertet werden. Bezüglich der Konzentrationsänderung müssen die Signale S(λx) und D(λx) als konzentrationsunabhängige Funktionskoeffizienten linearisiert werden. Zur Identifikation von spezifischen Anschmutzungen in realen aus mehreren Anschmutzungen zusammengesetzten Signalen sind weitere mathematische Verfahren (z. B. Addition, Subtraktion, Faltung, Integralrechnung, Differentialrechnung usw.) anzuwenden. Weiterhin können die Methoden der Signal- und Systemtheorie sowie der Statistik (z. B. Klassifizierung) zum Einsatz kommen oder auch die Autokorrelation. Mit Hilfe dieser mathematischen Methoden können insbesondere die durch die verschiedenen Anschmutzungen typischen Signalverläufe analysiert werden.Furthermore, all other possible combinations can be evaluated. With regard to the change in concentration, the signals S (λ x ) and D (λ x ) must be linearized as concentration-independent function coefficients. Further mathematical methods (e.g. addition, subtraction, folding, integral calculation, differential calculation, etc.) must be used to identify specific soiling in real signals composed of several soiling. Furthermore, the methods of signal and system theory as well as statistics (e.g. classification) can be used or also autocorrelation. With the help of these mathematical methods, the signal curves typical of the different soiling can be analyzed.
Gemäß Fig. 2 ist erfindungsgemäß der Trübungssensor (1) mit mindestens einem Licht-Sendekanal (5a) und drei Licht-Empfangskanälen für Durchlicht (6a), 25°-Streulicht (6c) (Vorwärtsstreuung) und 90°-Streulicht (6b) ausgebildet. Bei dieser Ausführung des Trübungssensors (1) werden die Primärlichtstrahlen polarisiert. Dafür ist das Polarisationsfilter (7) im Strahlengang des Sendekanals (5) angeordnet. Es hat sich gezeigt, dass mit dieser Variante geringe Konzentrationen (z. B. Milch) gut erkannt werden können. Bei der Auswertung kommen wieder die zuvor beschriebenen mathematischen Verfahren zur Anwendung. Das Polarisationsfilter (7) kann wieder linear, elliptisch oder zirkular polarisieren. Sowohl bei dem Ausführungsbeispiel nach Fig. 1 als auch bei dem Beispiel nach Fig. 2, oder auch nach Fig. 3, kann das gewählte statische Polarisationsfilter (7) in Form einer Spiegel-Optik auch durch einen elektrisch betriebenen Polarisationsdreher mit einem optischen Drehwinkel von 0° bis 90° ersetzt oder als Alternativlösung vorgesehen werden. Durch ein derartiges "Polarisationsfilter" könnte auf einfache Art und Weise die Polarisationsrichtung stufenlos eingestellt werden.2, according to the invention, the turbidity sensor (1) with at least one light transmission channel (5a) and three light receiving channels for transmitted light (6a), 25 ° scattered light (6c) (Forward scatter) and 90 ° scattered light (6b). In this version of the turbidity sensor (1) the primary light rays are polarized. The polarization filter (7) is in the Beam path of the transmission channel (5) arranged. It has been shown that with this variant low concentrations (e.g. milk) can be easily recognized. Come in the evaluation again the previously described mathematical methods for use. The polarization filter (7) can polarize again linearly, elliptically or circularly. Both in the embodiment 1 as well as in the example according to FIG. 2, or also according to FIG. 3 the chosen static polarization filter (7) in the form of a mirror optic also through a electrically operated polarization rotator with an optical angle of rotation of 0 ° to 90 ° or be provided as an alternative solution. With such a "polarization filter" the polarization direction could be set continuously in a simple manner.
Die Fig. 3 stellt eine Konstruktionsvariante zu den Fig. 1 und 2 dar, wobei das Leitrohr (2) für die zu sensierende Spülflüssigkeit (3) im wesentlichen quer zu den Licht-Sendekanälen (5a, 5b) und Empfangskanälen (6a bis 6c) angeordnet ist. Lichtsender (5) und Empfänger (6) liegen dabei in der selben Ebene, in welcher sich auch die die Messstrecken (4) kennzeichnenden Streukegel (8) der emittierten, reflektierten und polarisierten Lichtstrahlen der Dioden ausbreiten. Den beiden Licht-Sendekanälen (5a, 5b) für blaues und rotes Licht liegt der für Durchlicht sensible Licht-Empfangskanal (6a) gegenüber, während der Licht-Empfangskanal (6b) für 90°-Streulicht in Strömungsrichtung der Spülflüssigkeit und der dritte Licht-Empfangskanal (6c) für Streulicht (Vorwärtsstreuung) gleich oder weniger als 45°, vorzugsweise 25°, um diesen Winkel versetzt den Licht-Sendekanälen (5a, 5b) gegenüberliegt. Vor den beiden Licht-Sendekanälen (5a, 5b) ist das Polarisationsfilter (7) bzw. der elektrisch betriebene Polarisationsdreher angeordnet.3 shows a construction variant of FIGS. 1 and 2, the guide tube (2) for the rinsing liquid (3) to be sensed essentially transversely to the light transmission channels (5a, 5b) and receiving channels (6a to 6c) is arranged. Light transmitter (5) and receiver (6) are thereby on the same level in which the measuring sections (4) are also identified Spread the scattering cone (8) of the emitted, reflected and polarized light beams from the diodes. The two light transmission channels (5a, 5b) for blue and red light are for transmitted light sensitive light receiving channel (6a) opposite, while the light receiving channel (6b) for 90 ° scattered light in the direction of flow of the rinsing liquid and the third light receiving channel (6c) for Scattered light (forward scatter) equal to or less than 45 °, preferably 25 °, by this angle offset from the light transmission channels (5a, 5b). In front of the two light transmission channels (5a, 5b) the polarization filter (7) or the electrically operated polarization rotator is arranged.
Eine weitere Variante zu den gezeigten und beschriebenen Beispielen könnte auch in einem Einsatz mehrerer selektiver Trübungssensoren (1) gesehen werden, wobei beispielsweise ein Trübungssensor für die Erkennung nur von Partikeln und ein anderer Trübungssensor hingegen für die Erkennung von Emulsionen, beispielsweise von Milchresten oder dergl. im Spülwasser zuständig ist. Auch wäre eine Trübungsmessung nach dem Reflektionsprinzip denkbar, wobei eine Änderung des Brechungsindex von Wasser oder Störungen durch Partikel an der Spülwasseroberfläche bei Spülflüssigkeit-Verunreinigungen zu einem guten Ergebnis führen dürfte.Another variant of the examples shown and described could also be in one Use of several selective turbidity sensors (1) can be seen, for example a Turbidity sensor for the detection of particles only and another turbidity sensor for the detection of emulsions, for example milk residues or the like in the rinsing water responsible is. A turbidity measurement based on the reflection principle would also be conceivable being a change in the refractive index of water or interference from particles on the Rinse water surface lead to a good result in case of rinsing liquid contamination likely.
Mit den beschriebenen Anordnungen lassen sich unter Anwendung der angeführten Rechenoperationen, insbesondere durch die Quotientenbildung der mit der Spülflüssigkeit strömenden Partikel nach Art und Größe durch Vergleich mit im Rechner "eingespeicherten" Werten und auch sog. "Fingerprints", die symptomatisch für spezielle Kombianschmutzungen sind, mittels eines geeigneten Mikrocontrollers "erkennen". Durch den Einsatz des erfindungsgemäß auf die Erfassung von Streulicht und Polarisationslicht ausgebildeten Trübungssensors (1) lässt sich ein Spülprogrammlauf hinsichtlich Wasserwechsel, Reinigerzugabe, Programmlaufzeit, Temperatureinstellungen usw. vorteilhaft optimieren.With the described arrangements, using the arithmetic operations mentioned, in particular by forming the quotient of those flowing with the rinsing liquid Particles by type and size by comparison with values "stored" in the computer and so-called "fingerprints", which are symptomatic of special combination soiling, by means of "recognize" a suitable microcontroller. By using the invention on the Detection of scattered light and polarization light designed turbidity sensor (1) can be a rinse program run with regard to water change, addition of detergent, program duration, temperature settings etc. optimize advantageously.
Claims (9)
dadurch gekennzeichnet, dass mindestens einem der Sendekanäle (5a, 5b) ein weiterer Empfangskanal (6a bis 6d) für den Empfang von Streulicht von 45° oder kleiner und mindestens einem der Streulicht-Empfangskanäle (6a bis 6d) und/oder dem Sendekanal (5) ein Filter (7) zur Lichtpolarisation zugeordnet ist.Turbidity sensor (1) for detecting turbidity in the dishwashing liquid of a dishwasher, the sensor (1) being designed with a plurality of transmission channels (5; 5a, 5b) for light with different light wavelengths and a plurality of reception channels (6a to 6d), which are at different angles Relative to the transmission channels (5; 5a, 5b) are arranged in a ring around a transparent guide tube (2) carrying the rinsing liquid, one receiving channel (6; 6a) for transmitted light aligned with the transmission channel (5; 5a, 5b) and another Receiving channel (6b) for 90 ° scattered light reception is arranged offset by 90 °,
characterized in that at least one of the transmission channels (5a, 5b) has a further reception channel (6a to 6d) for receiving scattered light of 45 ° or smaller and at least one of the scattered light reception channels (6a to 6d) and / or the transmission channel (5 ) a filter (7) for light polarization is assigned.
dadurch gekennzeichnet, dass zur Lichtpolarisation ein statisches Polarisationsfilter (7) vorgesehen ist.Turbidity sensor according to claim 1,
characterized in that a static polarization filter (7) is provided for light polarization.
dadurch gekennzeichnet, dass zur Lichtpolarisation ein elektrisch betriebener Polarisationsdreher mit einem optischen Drehwinkel von 0° bis 90° vorgesehen ist.Turbidity sensor according to claim 1,
characterized in that an electrically operated polarization rotator with an optical angle of rotation of 0 ° to 90 ° is provided for light polarization.
dadurch gekennzeichnet, dass die von den Polarisationsfiltern (7) erfassten Lichtstrahlen linear, elliptisch oder zirkular polarisiert werden.Turbidity sensor according to one or more of claims 1 to 3,
characterized in that the light beams detected by the polarization filters (7) are linearly, elliptically or circularly polarized.
dadurch gekennzeichnet, dass die Filter (7) zur Polarisation der Primärlichtstrahlen im Strahlengang der Sendekanäle (5) angeordnet sind.Turbidity sensor according to one or more of claims 1 to 4,
characterized in that the filters (7) for polarizing the primary light beams are arranged in the beam path of the transmission channels (5).
dadurch gekennzeichnet, dass bei den kreisringförmig um das die Spülflüssigkeit (3) führende transparente Leitrohr (2) herum angeordneten Sendekanälen (5a, 5b) für Licht mit unterschiedlichen Lichtwellenlängen (λ1, λ2) und bei den unter verschiedenen Winkeln relativ zu den Sendekanälen (5a, 5b) vorgesehenen Empfangskanälen (6a bis 6d) die Anordnung der optischen Empfänger (6) so getroffen ist, dass der Empfangskanal (6a) für Durchlicht den Licht-Sendekanälen (5; 5a, 5b) direkt gegenüberliegt, während dem Empfangskanal (6b) für einen 90°-Streulichtempfang entsprechend ein zweiter Empfangskanal (6d) für polarisiertes Streulicht von 90° direkt gegenüberliegt, dem das Polarisationsfilter (7) vorgeschaltet ist, und wobei den Licht-Sendekanälen (5a, 5b) ein weiterer Empfangskanal (5c) für den Empfang von Streulicht von vorzugsweise kleiner als 45° zugeordnet ist.Turbidity sensor according to one or more of claims 1 to 5,
characterized in that in the case of the transmission channels (5a, 5b) arranged in a ring around the transparent guide tube (2) guiding the rinsing liquid (3) for light with different light wavelengths (λ 1 , λ 2 ) and at different angles relative to the transmission channels (5a, 5b) provided receiving channels (6a to 6d) the arrangement of the optical receivers (6) is such that the receiving channel (6a) for transmitted light is directly opposite the light-transmitting channels (5; 5a, 5b) while the receiving channel ( 6b) for 90 ° scattered light reception, a second reception channel (6d) for polarized scattered light of 90 ° is directly opposite, which is preceded by the polarization filter (7), and the light transmission channels (5a, 5b) have a further reception channel (5c) for receiving scattered light of preferably less than 45 °.
dadurch gekennzeichnet, dass den Licht-Sendekanälen (5) ein Licht-Empfangskanal (6c) für den Empfang von Streulicht von vorzugsweise 25° am Leitrohr (2) zugeordnet ist, und dass das Polarisationsfilter (7) im Primärstrahlengang der Licht-Sendekanäle (5a, 5b) angeordnet ist.Turbidity sensor according to one or more of claims 1 to 6,
characterized in that the light transmission channels (5) are assigned a light reception channel (6c) for receiving scattered light of preferably 25 ° at the guide tube (2), and in that the polarization filter (7) in the primary beam path of the light transmission channels (5a , 5b) is arranged.
dadurch gekennzeichnet, dass zur Partikelerkennung und deren Auswertung ein von den Signalen des Trübungssensors (1) beaufschlagter Mikroprozessor oder Mikrocontroller vorgesehen ist, welcher insbesondere die Quotienten
Durchlicht (λ1) : Durchlicht (λ2) oder D(λ1): D(λ2)
und
Streulicht (λ1) : Durchlicht (λ1) oder S(λ1) : D(λ1)
und
Streulicht (λ1) : Durchlicht (λ2) oder S(λ1) : D(λ2)
bildet, wobei D(λx) und S(λx) abgeglichene Spannungssignale im Durchlichtkanal und Spannungssignale im Streulichtkanal (Streulicht =/< 45°, 90°, 90°pol) in Abhängigkeit der jeweiligen Lichtwellenlänge (LED-Farbe blau oder rot) darstellen, und dass zur Identifikation von spezifischen Anschmutzungen ("Fingerprints") die ermittelten Werte mathematischen Rechenverfahren, wie Addition, Subtraktion, Faltung, Integral- oder Differentialrechnung und dergl. unterzogen werden.Turbidity sensor according to one or more of claims 1 to 7,
characterized in that a microprocessor or microcontroller which is acted upon by the signals of the turbidity sensor (1) is provided for particle detection and evaluation thereof, said microprocessor in particular the quotient
Transmitted light (λ 1 ): transmitted light (λ 2 ) or D (λ 1 ): D (λ 2 )
and
Scattered light (λ 1 ): transmitted light (λ 1 ) or S (λ 1 ): D (λ 1 )
and
Scattered light (λ 1 ): transmitted light (λ 2 ) or S (λ 1 ): D (λ 2 )
forms, with D (λ x ) and S (λ x ) balanced voltage signals in the transmitted light channel and voltage signals in the scattered light channel (scattered light = / <45 °, 90 °, 90 ° pol) depending on the respective light wavelength (LED color blue or red) represent, and that for the identification of specific soiling ("fingerprints") the determined values are subjected to mathematical calculation methods such as addition, subtraction, folding, integral or differential calculation and the like.
dadurch gekennzeichnet, dass mehrere Trübungssensoren (1), die jeweils für bestimmte Spülflüssigkeit-Verschmutzungen sensibel sind, in Kombination miteinander vorgesehen sind.Turbidity sensor according to one or more of claims 1 to 8,
characterized in that several turbidity sensors (1), each of which is sensitive to certain rinsing liquid soiling, are provided in combination with one another.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2001119973 DE10119973A1 (en) | 2001-04-24 | 2001-04-24 | Turbidity sensor for the detection of turbidity in the dishwashing liquid of a dishwasher |
| DE10119973 | 2001-04-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1252857A2 true EP1252857A2 (en) | 2002-10-30 |
| EP1252857A3 EP1252857A3 (en) | 2004-02-04 |
Family
ID=7682479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02006143A Ceased EP1252857A3 (en) | 2001-04-24 | 2002-03-19 | Turbidity sensor for measuring turbidity in the washing liquid in a dishwasher |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1252857A3 (en) |
| DE (1) | DE10119973A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2160970A2 (en) | 2008-09-05 | 2010-03-10 | Vestel Beyaz Esya Sanayi Ve Ticaret A.S. | Weight sensing method for dishwashers |
| WO2014195946A1 (en) * | 2013-06-03 | 2014-12-11 | Blue-I Water Technologies Ltd. | System and method for simultaneous measurement of turbidity, color and chlorine content of a sample of a liquid |
| CN105806812A (en) * | 2016-03-16 | 2016-07-27 | 上海交通大学 | Rapid photoelectric type biological magnetic bead concentration detection method and system |
| DE102015223371A1 (en) * | 2015-11-26 | 2017-06-01 | BSH Hausgeräte GmbH | Sensor device for determining a property of a liquid, method for operating the sensor device and water-conducting household appliance with the sensor device |
| EP3875665A4 (en) * | 2018-12-24 | 2022-01-26 | Samsung Electronics Co., Ltd. | Washing machine and control method therefor |
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| DE10257238B9 (en) * | 2002-12-04 | 2009-06-04 | Optotransmitter-Umweltschutz-Technologie E.V. | Method and device for the characterization of impurities in liquids |
| DE10360563A1 (en) * | 2003-12-22 | 2005-07-14 | BSH Bosch und Siemens Hausgeräte GmbH | Fluid contamination measurement procedure records selectively filtered transmitted and scatter light in visible, UV and IR regions as function of contamination level |
| DE102005061808A1 (en) * | 2005-12-23 | 2007-06-28 | BSH Bosch und Siemens Hausgeräte GmbH | Crockery washing machine consists of container and detector that controls aspects of the washing programme such as viscosity and opacity |
| DE102006030854A1 (en) * | 2006-07-04 | 2008-01-10 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for determining oil content of cleaning fluid, involves analyzing of measuring volume of cleaning fluid with optical radiation, and intensity of optical radiation part is measured in trans-illuminating direction by measuring volume |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP1252857A3 (en) | 2004-02-04 |
| DE10119973A1 (en) | 2002-10-31 |
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