EP1252857A2 - Capteur de turbidité pour mesurer la turbidité dans le liquide de lavage d'un lave-vaiselle - Google Patents

Capteur de turbidité pour mesurer la turbidité dans le liquide de lavage d'un lave-vaiselle Download PDF

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Publication number
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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EP
European Patent Office
Prior art keywords
light
channel
channels
reception
transmission channels
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
EP02006143A
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German (de)
English (en)
Other versions
EP1252857A3 (fr
Inventor
Andre Bertram
Erik Ekelhoff
Günther Dr. Ennen
Ulrich Hettenhausen
Eduard Dr. Sailer
Stefan Tiekötter
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.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
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.)
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Publication date
Application filed by Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP1252857A2 publication Critical patent/EP1252857A2/fr
Publication of EP1252857A3 publication Critical patent/EP1252857A3/fr
Ceased legal-status Critical Current

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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.

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  • Investigating Or Analysing Materials By Optical Means (AREA)
EP02006143A 2001-04-24 2002-03-19 Capteur de turbidité pour mesurer la turbidité dans le liquide de lavage d'un lave-vaiselle Ceased EP1252857A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10119973 2001-04-24
DE2001119973 DE10119973A1 (de) 2001-04-24 2001-04-24 Trübungssensor zur Erkennung von Trübungen in der Spülflüssigkeit einer Geschirrspülmaschine

Publications (2)

Publication Number Publication Date
EP1252857A2 true EP1252857A2 (fr) 2002-10-30
EP1252857A3 EP1252857A3 (fr) 2004-02-04

Family

ID=7682479

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02006143A Ceased EP1252857A3 (fr) 2001-04-24 2002-03-19 Capteur de turbidité pour mesurer la turbidité dans le liquide de lavage d'un lave-vaiselle

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EP (1) EP1252857A3 (fr)
DE (1) DE10119973A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2160970A2 (fr) 2008-09-05 2010-03-10 Vestel Beyaz Esya Sanayi Ve Ticaret A.S. Procédé de détection du poids pour lave-vaisselle
WO2014195946A1 (fr) * 2013-06-03 2014-12-11 Blue-I Water Technologies Ltd. Système et procédé de mesure simultanée de turbidité, de couleur et de teneur en chlore d'un échantillon d'un liquide
CN105806812A (zh) * 2016-03-16 2016-07-27 上海交通大学 一种光电式生物磁珠浓度快速检测***与方法
DE102015223371A1 (de) * 2015-11-26 2017-06-01 BSH Hausgeräte GmbH Sensorvorrichtung zum Bestimmen einer Eigenschaft einer Flüssigkeit, Verfahren zum Betreiben der Sensorvorrichtung sowie wasserführendes Haushaltsgerät mit der Sensorvorrichtung
EP3875665A4 (fr) * 2018-12-24 2022-01-26 Samsung Electronics Co., Ltd. Lave-linge et son procédé de commande

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10257238B9 (de) * 2002-12-04 2009-06-04 Optotransmitter-Umweltschutz-Technologie E.V. Verfahren und Vorrichtung zur Charakterisierung von Verunreinigungen in Flüssigkeiten
DE10360563A1 (de) * 2003-12-22 2005-07-14 BSH Bosch und Siemens Hausgeräte GmbH Verfahren und Vorrichtung zur Bestimmung des Verunreinigungszustands von Flüssigkeiten
DE102005061808A1 (de) * 2005-12-23 2007-06-28 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine und Verfahren zum Betreiben einer Geschirrspülmaschine für Niedertemperatur-Klarspülmittel
DE102006030854A1 (de) * 2006-07-04 2008-01-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Bestimmung des Ölgehalts einer Reinigungsflüssigkeit
DE102013219932B4 (de) * 2013-10-01 2016-01-28 J & M Analytik Ag Optische Messvorrichtung und Messverfahren

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DE4122988A1 (de) * 1990-07-12 1992-01-16 Alps Electric Co Ltd Automatische wasch- bzw. reinigungsvorrichtung
US5291626A (en) * 1992-05-01 1994-03-08 General Electric Company Machine for cleansing articles
US5331177A (en) * 1993-04-26 1994-07-19 Honeywell Inc. Turbidity sensor with analog to digital conversion capability
US5446531A (en) * 1994-05-20 1995-08-29 Honeywell Inc. Sensor platform for use in machines for washing articles
US5604590A (en) * 1994-09-08 1997-02-18 Hach Company Nephelometer instrument
DE19806559A1 (de) * 1998-02-17 1999-08-19 Bosch Siemens Hausgeraete Verfahren und Vorrichtung zur Behandlung von Geschirr in Spülmaschinen
US20020159062A1 (en) * 2001-02-20 2002-10-31 Ottens Gregory J. Focused laser light turbidity sensor apparatus and method for measuring very low concentrations of particles in fluids
US20020159061A1 (en) * 2001-02-21 2002-10-31 Ottens Gregory J. Focused laser light turbidity sensor

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DE3715798A1 (de) * 1987-05-12 1988-01-07 Erich Ing Grad Huber Opto-elektronische einrichtung zum erkennen von verschmutzung transparenter schutzscheiben und ausloesen der reinigungsmassnahmen
JPH01145552A (ja) * 1987-12-02 1989-06-07 Olympus Optical Co Ltd 自動分析装置
DE4139899A1 (de) * 1991-12-04 1993-06-09 Hoffmann, Alfred, Dr., 9200 Freiberg, De Verfahren zur simultanmessung der truebung und des zeitlichen massenstromes suspendierter teilchen in fluessigkeiten
DE4415823C2 (de) * 1994-05-05 2001-07-19 Aeg Hausgeraete Gmbh Verfahren zur Spülprogramm-Steuerung in Haushalt-Geschirrspülmaschinen und Vorrichtung zur Durchführung des Verfahrens
DE29511344U1 (de) * 1995-07-13 1996-11-14 Byk-Gardner GmbH, 82538 Geretsried Vorrichtung zur Messung von optischen Kenngrößen transparenter Materialien
DE19651296B4 (de) * 1996-12-10 2016-11-10 BSH Hausgeräte GmbH Geschirrspülmaschine mit einer Steuereinrichtung
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Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4122988A1 (de) * 1990-07-12 1992-01-16 Alps Electric Co Ltd Automatische wasch- bzw. reinigungsvorrichtung
US5291626A (en) * 1992-05-01 1994-03-08 General Electric Company Machine for cleansing articles
US5291626B1 (en) * 1992-05-01 1996-05-21 Gen Electric Machine for cleansing articles
US5331177A (en) * 1993-04-26 1994-07-19 Honeywell Inc. Turbidity sensor with analog to digital conversion capability
US5446531A (en) * 1994-05-20 1995-08-29 Honeywell Inc. Sensor platform for use in machines for washing articles
US5604590A (en) * 1994-09-08 1997-02-18 Hach Company Nephelometer instrument
DE19806559A1 (de) * 1998-02-17 1999-08-19 Bosch Siemens Hausgeraete Verfahren und Vorrichtung zur Behandlung von Geschirr in Spülmaschinen
US20020159062A1 (en) * 2001-02-20 2002-10-31 Ottens Gregory J. Focused laser light turbidity sensor apparatus and method for measuring very low concentrations of particles in fluids
US20020159061A1 (en) * 2001-02-21 2002-10-31 Ottens Gregory J. Focused laser light turbidity sensor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2160970A2 (fr) 2008-09-05 2010-03-10 Vestel Beyaz Esya Sanayi Ve Ticaret A.S. Procédé de détection du poids pour lave-vaisselle
WO2014195946A1 (fr) * 2013-06-03 2014-12-11 Blue-I Water Technologies Ltd. Système et procédé de mesure simultanée de turbidité, de couleur et de teneur en chlore d'un échantillon d'un liquide
US10190980B2 (en) 2013-06-03 2019-01-29 Blue-I Water Technologies Ltd. System and method for simultaneous measurement of turbidity, color and chlorine content of a sample of a liquid
DE102015223371A1 (de) * 2015-11-26 2017-06-01 BSH Hausgeräte GmbH Sensorvorrichtung zum Bestimmen einer Eigenschaft einer Flüssigkeit, Verfahren zum Betreiben der Sensorvorrichtung sowie wasserführendes Haushaltsgerät mit der Sensorvorrichtung
CN105806812A (zh) * 2016-03-16 2016-07-27 上海交通大学 一种光电式生物磁珠浓度快速检测***与方法
CN105806812B (zh) * 2016-03-16 2020-02-21 上海交通大学 一种光电式生物磁珠浓度快速检测***与方法
EP3875665A4 (fr) * 2018-12-24 2022-01-26 Samsung Electronics Co., Ltd. Lave-linge et son procédé de commande

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Publication number Publication date
DE10119973A1 (de) 2002-10-31
EP1252857A3 (fr) 2004-02-04

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