DE102009054136A1 - Method for stabilizing drift of color sensor, involves equipping measuring channel with useful multi-band photo receiver, and synchronously enabling electronic signal processing of reference receiver and useful receiver - Google Patents
Method for stabilizing drift of color sensor, involves equipping measuring channel with useful multi-band photo receiver, and synchronously enabling electronic signal processing of reference receiver and useful receiver Download PDFInfo
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- DE102009054136A1 DE102009054136A1 DE102009054136A DE102009054136A DE102009054136A1 DE 102009054136 A1 DE102009054136 A1 DE 102009054136A1 DE 102009054136 A DE102009054136 A DE 102009054136A DE 102009054136 A DE102009054136 A DE 102009054136A DE 102009054136 A1 DE102009054136 A1 DE 102009054136A1
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012545 processing Methods 0.000 title claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 7
- 238000012937 correction Methods 0.000 claims abstract description 14
- 238000005286 illumination Methods 0.000 claims description 26
- 230000006641 stabilisation Effects 0.000 claims description 18
- 238000011105 stabilization Methods 0.000 claims description 18
- 230000035945 sensitivity Effects 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 108091008695 photoreceptors Proteins 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 description 5
- 230000032683 aging Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
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- 238000007639 printing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- 238000001514 detection method Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
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- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0213—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using attenuators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
- G01J3/524—Calibration of colorimeters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J2003/2866—Markers; Calibrating of scan
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Driftstabilisierung bei Farbsensoren mit variabler Lichtmengeneinstellung für den Referenzkanal, sowie eine Anordnung zur Driftstabilisierung bei Farbsensoren mit variabler Lichtmengeneinstellung für den Referenzkanal.The invention relates to a method for drift stabilization in color sensors with variable light quantity adjustment for the reference channel, as well as an arrangement for drift stabilization in color sensors with variable light amount adjustment for the reference channel.
Allgemeiner Stand der TechnikGeneral state of the art
Verschiedene Stabilisierungsmaßnahmen bei Farbsensoren sind dem Stand der Technik nach bekannt.Various stabilization measures in color sensors are known from the prior art.
Häufig Verwendung finden Verfahren zur Temperaturgangskompensation (z. B.
In der
Aus der
Aus der
Die
Aus der
Andere Verfahren, die speziell in der Druckindustrie Verwendung finden, gehen von der Vermessung von Referenzdruckmarken zur Korrektur aus (z. B.
Aufgabe der ErfindungObject of the invention
Im industriellen Einsatz werden an Farbsensoren hohe Anforderungen gestellt. Farbwerte, die zum Zeitpunkt der Sensoreinrichtung erfasst wurden, sollen auch nach langer Betriebszeit und bei veränderten Umgebungsbedingungen sowie bei vorhanden sein von Wechselstörlicht (Kunstlicht in Werkshallen) Ihre Gültigkeit behalten. Da Temperaturschwankungen und Alterungserscheinungen der Elektronik und Leuchtmittel die Farbwerte verändern lassen, müssen die Sensoren gegen Drifterscheinungen stabilisiert werden. Um eine flexible Anpassung an die jeweilige Farbsensorapplikation zu ermöglichen, müssen die Sensoren aber über einen weiten Dynamikbereich verfügen. Dies wird durch einstellbare Empfangsempfindlichkeiten und Beleuchtungsstärken realisiert. Die Variabilität der Sensorempfindlichkeit und Beleuchtungsintensität erschwert aber prinzipbedingt eine Stabilisierung.In industrial applications, high demands are placed on color sensors. Color values that were recorded at the time of the sensor device should remain valid even after a long period of operation and under changed environmental conditions as well as when there is an alternating light source (artificial light in factory halls). Since temperature fluctuations and aging phenomena of the electronics and illuminants can change the color values, the sensors must be stabilized against drift phenomena. However, to enable flexible adaptation to the respective color sensor application, the sensors must have a wide dynamic range. This is realized by adjustable reception sensitivities and illuminances. However, the variability of the sensor sensitivity and illumination intensity makes stabilization more difficult in principle.
Die Aufgabe der Erfindung besteht daher darin, Farbsignale von Farbsensoren bei kompakter Bauweise und guter Bedienbarkeit hochwirksam gegen Drifterscheinungen und Wechselstörlicht zu stabilisieren, aber dabei gleichzeitig eine variable Empfindlichkeits- bzw. Beleuchtungsintensitätseinstellung zuzulassen. Die Lösung dieser Aufgabe ist in den Patentansprüchen angegeben.The object of the invention is therefore to stabilize color signals of color sensors with a compact design and good operability highly effective against drift phenomena and Wechselstörlicht, but at the same time allow a variable sensitivity or illumination intensity setting. The solution to this problem is specified in the claims.
Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass von der im Sensor zur Messobjektbeleuchtung integrierten Weißlicht-LED ein variabler Teil des Messlichtes mittels Lichtwellenleiter ausgekoppelt wird und auf einen dem Nutzmehrbereichsfotoempfänger identischen Referenzmehrbereichsfotoempfänger geruht wird. Dabei erfolgt eine Modulation des Beleuchtungslichtes, um typisches Wechselstörlicht, welches bei Kunstlichtbeleuchtung im industriellen Umfeld häufig auftritt, zu eliminieren. Im Empfangsteil des Farbsensors erfolgt dann eine entsprechende Demodulation.According to the invention, the object is achieved by decoupling a variable part of the measuring light from the white-light LED integrated in the sensor for measuring object illumination by means of optical waveguides and resting on a reference multisector receiver identical to the useful multirange photo-receiver. In this case, a modulation of the illumination light, in order to eliminate typical Wechselstörlicht, which often occurs in artificial lighting in the industrial environment. In the receiving part of the color sensor then takes place a corresponding demodulation.
Für die Wirksamkeit der Stabilisierung sind die Symmetrie der Signale und deren gleichartige, parallele und synchrone Verarbeitung entscheidend. Mit jeder applikationsbedingten Änderung der Empfangsempfindlichkeit am Sensor muss daher zur Erhaltung der Signalsymmetrie auch die Empfangsempfindlichkeit des Referenzkanals gleichgeschaltet werden. Weiterhin ändert sich applikationsbedingt die Beleuchtungsintensität. Durch Änderung der Empfindlichkeit oder Beleuchtungsintensität ändert sich aber das Signal im Referenzpfad derart, dass der zulässige Signalbereich verlassen wird. Nutz- und Referenzmesskanalsignale müssen aber zur ordnungsgemäßen Funktion in einem gültigen Bereich liegen, damit eine korrekte A/D Wandlung durchgeführt werden kann. Die Aufgabe der Erfindung besteht daher auch darin, die unvermeidbare Empfindlichkeits- und Beleuchtungsvariation durch eine Einstellbarkeit der auf den Referenzmehrbereichsfotoempfänger gekoppelten Lichtmenge auszugleichen.For the effectiveness of the stabilization, the symmetry of the signals and their similar, parallel and synchronous processing are crucial. With each application-related change in the reception sensitivity at the sensor therefore the reception sensitivity of the reference channel must be synchronized to maintain the signal symmetry. Furthermore, the illumination intensity changes due to the application. By changing the sensitivity or illumination intensity, however, the signal in the reference path changes in such a way that the permissible signal range is left. However, useful and reference channel signals must be within a valid range for proper function to allow correct A / D conversion. Therefore, the object of the invention is also to compensate for the unavoidable sensitivity and illumination variation by adjustability of the amount of light coupled to the reference multirange photoreceiver.
Erfindungsgemäß wird die auf den Referenzmehrbereichsfotoempfänger gekoppelte variable Lichtmengeeinstellung, durch eine Lichtabschnürvorrichtung eines optischen Freistrahlkanals bewirkt. Die optische Abschnürung des Freistrahlkanals wird mechanisch vorgenommen, indem eine Abschattung durch ein mechanisch bewegliches Element vorgenommen wird. Zur Wirksamkeit der Sensorstabilisierungsfunktion ist es erforderlich, dass die Einstellung des mechanisch beweglichen Elementes der Lichtabschnürvorrichtung stabil ist, damit keine Signaländerungen hervorgerufen werden.According to the invention, the variable light quantity adjustment coupled to the reference multi-range photoreceiver is effected by a light curtailment device of an optical free-jet channel. The optical constriction of the free jet channel is made mechanically by shading is performed by a mechanically movable element. The effectiveness of the sensor stabilization function requires that the adjustment of the mechanically movable element of the light curtailment device be stable so that no signal changes are caused.
Weiterhin beruht die Wirkung der Stabilisierungsfunktion auf einer Verarbeitung der elektrischen Signale der jeweiligen Mehrbereichsfotoempfänger in folgender Weise. Die Fotoströme werden mittels Strom/Spannungswandlung und Signalverstärkung zur A/D Wandlung konditioniert. Entscheidend ist die Symmetrie der Signalverarbeitung und die synchrone Signalerfassung. Die Steuerung der Messabläufe und die Nutzfarbsignalkorrektur erfolgen im angeschlossenen Mikrokontroller. Aus abgespeicherten Farbwerten des Referenzfarbmesskanals werden Korrekturfaktoren ermittelt, die auf den Nutzfarbmesskanal zur Stabilisierung der Werte angewendet werden. Entscheidend für die korrekte Funktion der Stabilisierung ist, dass bei jeder applikationsbedingten Änderung der Signalverhältnisse im Referenzfarbmesskanal eine neue Abspeicherung der Farbwerte erfolgt.Furthermore, the effect of the stabilizing function is based on processing the electrical signals of the respective multi-range photoreceivers in the following manner. The photocurrents are conditioned by means of current / voltage conversion and signal amplification for A / D conversion. The decisive factor is the symmetry of the signal processing and the synchronous signal acquisition. The control of the measuring sequences and the color coding correction take place in the connected microcontroller. From stored color values of the reference color measurement channel, correction factors are determined which are applied to the useful color measurement channel for stabilizing the values. Decisive for the correct function of the stabilization is that with each application-related change of the signal conditions in the reference color measurement channel a new storage of the color values takes place.
Kurzbeschreibung der Figuren Brief description of the figures
Ausführungsbeispieleembodiments
Die Erfindung wird im Folgenden an zwei Ausführungsbeispielen erläutert.The invention will be explained below with reference to two exemplary embodiments.
Ausführungsbeispiel 1
In
Das Frontend
Ausführungsbeispiel 2Embodiment 2
In
Das Optikfrontend
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 11
- Frontendfrontend
- 22
- Trägerplatinecarrier board
- 33
- NutzmehrbereichsfotoempfängerNutzmehrbereichsfotoempfänger
- 44
- ReferenzmehrbereichsfotoempfängerReference multigrade photoreceptor
- 55
- ReferenzlichtwellenleiterReference optical fiber
- 66
- NutzlichtwellenleiterNutzlichtwellenleiter
- 77
- LichtabschnürvorrichtungLichtabschnürvorrichtung
- 88th
- Lichtquelle Weißlicht-LEDLight source white light LED
- 99
- FreistrahllichtkanalFree jet light channel
- 1010
- GewindestiftSet screw
- 1111
- LED-BeleuchtungsansteuerungLED lighting control
- 1212
- Strom/Spannungswandler ReferenzkanalCurrent / voltage converter reference channel
- 1313
- Strom/Spannungswandler NutzkanalCurrent / voltage converter useful channel
- 1414
- Signalverstärker ReferenzkanalSignal amplifier reference channel
- 1515
- Signalverstärker NutzkanalSignal amplifier traffic channel
- 1616
- A/D Wandler ReferenzkanalA / D converter reference channel
- 1717
- A/D Wandler NutzkanalA / D converter traffic channel
- 1818
- Mikrokontroller NutzkanalMicrocontroller user channel
- 1919
- Farbsensorcolor sensor
- 2020
- SendelichtauskopplungTransmitting light extraction
- 2121
- EmpfangslichteinkopplungEmpfangslichteinkopplung
- 2222
- Beleuchtungs- und AbschnürblockLighting and pinch block
- 23 23
- Beleuchtungsblocklighting block
- 2424
- Exzenterscheibeeccentric
- 2525
- Drehachseaxis of rotation
- 2626
- DrehachsenhalterPivot holders
- 2727
- ReferenzlichtleiterhalterungReference light guide holder
- 2828
- Optikfrontendoptics frontend
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 7098443 A [0003] US7098443A [0003]
- EP 0319769 B [0003] EP 0319769 B [0003]
- US 2006/022122 A [0003] US 2006/022122 A [0003]
- US 5266792 A [0003] US 5266792 A [0003]
- US 2008/245954 A [0003] US 2008/245954 A [0003]
- DE 202007006342 A [0004] DE 202007006342 A [0004]
- DE 4413594 A [0005] DE 4413594 A [0005]
- DE 19736844 A [0006] DE 19736844 A [0006]
- DE 3244286 A [0007] DE 3244286A [0007]
- DE 3741940 A [0008] DE 3741940 A [0008]
- US 2003/063338 A [0009] US 2003/063338 A [0009]
- US 2003/020972 A [0009] US 2003/020972 A [0009]
- US 2007/177231 A [0009] US 2007/177231 A [0009]
- US 6222648 A [0009] US 6222648 A [0009]
Claims (5)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202009018177U DE202009018177U1 (en) | 2009-11-20 | 2009-11-20 | Drift-stabilized color sensor with variable sensitivity and illumination intensity |
DE102009054136A DE102009054136A1 (en) | 2009-11-20 | 2009-11-20 | Method for stabilizing drift of color sensor, involves equipping measuring channel with useful multi-band photo receiver, and synchronously enabling electronic signal processing of reference receiver and useful receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009054136A DE102009054136A1 (en) | 2009-11-20 | 2009-11-20 | Method for stabilizing drift of color sensor, involves equipping measuring channel with useful multi-band photo receiver, and synchronously enabling electronic signal processing of reference receiver and useful receiver |
Publications (1)
Publication Number | Publication Date |
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DE102009054136A1 true DE102009054136A1 (en) | 2011-05-26 |
Family
ID=51899708
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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DE102009054136A Ceased DE102009054136A1 (en) | 2009-11-20 | 2009-11-20 | Method for stabilizing drift of color sensor, involves equipping measuring channel with useful multi-band photo receiver, and synchronously enabling electronic signal processing of reference receiver and useful receiver |
DE202009018177U Expired - Lifetime DE202009018177U1 (en) | 2009-11-20 | 2009-11-20 | Drift-stabilized color sensor with variable sensitivity and illumination intensity |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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DE202009018177U Expired - Lifetime DE202009018177U1 (en) | 2009-11-20 | 2009-11-20 | Drift-stabilized color sensor with variable sensitivity and illumination intensity |
Country Status (1)
Country | Link |
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DE (2) | DE102009054136A1 (en) |
Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3340764A (en) * | 1963-06-24 | 1967-09-12 | Manufacturers Engineering & Eq | Color measuring system using a light biased photocell |
DE3244286A1 (en) | 1982-11-26 | 1984-05-30 | Kollmorgen Technologies Corp., Dallas, Tex. | Electrooptic device for detecting colours |
DE3741940A1 (en) | 1986-12-10 | 1988-07-07 | Hoya Corp | COLOR SENSOR |
EP0319769B1 (en) | 1987-12-03 | 1993-03-31 | Siemens Aktiengesellschaft | Colour-sensing device for identifying objects with a coloured surface |
US5266792A (en) | 1991-10-28 | 1993-11-30 | Simmonds Precision Products, Inc. | Temperature compensated optical detector |
DE4413594A1 (en) | 1994-04-20 | 1995-10-26 | Siemens Ag | Sensor arrangement for color detection of object surfaces |
US5471052A (en) * | 1993-10-25 | 1995-11-28 | Eaton Corporation | Color sensor system using a secondary light receiver |
DE19736844A1 (en) | 1997-08-23 | 1999-02-25 | Ronald Neubert | Colorimetry device for surfaces or transmitted or reflected radiation |
US6222648B1 (en) | 1997-01-21 | 2001-04-24 | Xerox Corporation | On line compensation for slow drift of color fidelity in document output terminals (DOT) |
US20020097400A1 (en) * | 1996-01-02 | 2002-07-25 | Jung Wayne D. | Apparatus and method for measuring optical characteristics of an object |
US20030020972A1 (en) | 2001-07-30 | 2003-01-30 | Francesc Subirada | Compensating for drift and sensor proximity in a scanning sensor, in color calibrating incremental printers |
US20030063338A1 (en) | 2001-10-02 | 2003-04-03 | Gudaitis Algird M. | Color calibration color value correction |
US20060022122A1 (en) | 2004-07-30 | 2006-02-02 | Tan Boon K | Temperature compensation method and apparatus for color sensors |
DE202007006342U1 (en) | 2007-01-29 | 2007-07-12 | Silicann Technologies Gmbh | Three-color detection system, for industrial automated applications, diverts part of the illuminating white light to a monitor to give reference and actual color values to compensate for drift |
US20070177231A1 (en) | 2006-01-31 | 2007-08-02 | Xerox Corporation | Halftone independent color drift correction |
DE102007015741B3 (en) * | 2007-03-30 | 2008-09-04 | Silicann Technologies Gmbh | Object detection method for industrial application, involves controlling space between object and channel, and carrying out correction of deviation between standard value and reference color value so that deviation lies within preset range |
US20080245954A1 (en) | 2007-04-03 | 2008-10-09 | Lite-On Semiconductor Corporation | Color sensitive device with temperature compensation and variable gain and display system using the same |
-
2009
- 2009-11-20 DE DE102009054136A patent/DE102009054136A1/en not_active Ceased
- 2009-11-20 DE DE202009018177U patent/DE202009018177U1/en not_active Expired - Lifetime
Patent Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3340764A (en) * | 1963-06-24 | 1967-09-12 | Manufacturers Engineering & Eq | Color measuring system using a light biased photocell |
DE3244286A1 (en) | 1982-11-26 | 1984-05-30 | Kollmorgen Technologies Corp., Dallas, Tex. | Electrooptic device for detecting colours |
DE3741940A1 (en) | 1986-12-10 | 1988-07-07 | Hoya Corp | COLOR SENSOR |
EP0319769B1 (en) | 1987-12-03 | 1993-03-31 | Siemens Aktiengesellschaft | Colour-sensing device for identifying objects with a coloured surface |
US5266792A (en) | 1991-10-28 | 1993-11-30 | Simmonds Precision Products, Inc. | Temperature compensated optical detector |
US5471052A (en) * | 1993-10-25 | 1995-11-28 | Eaton Corporation | Color sensor system using a secondary light receiver |
DE4413594A1 (en) | 1994-04-20 | 1995-10-26 | Siemens Ag | Sensor arrangement for color detection of object surfaces |
US20020097400A1 (en) * | 1996-01-02 | 2002-07-25 | Jung Wayne D. | Apparatus and method for measuring optical characteristics of an object |
US6222648B1 (en) | 1997-01-21 | 2001-04-24 | Xerox Corporation | On line compensation for slow drift of color fidelity in document output terminals (DOT) |
DE19736844A1 (en) | 1997-08-23 | 1999-02-25 | Ronald Neubert | Colorimetry device for surfaces or transmitted or reflected radiation |
US20030020972A1 (en) | 2001-07-30 | 2003-01-30 | Francesc Subirada | Compensating for drift and sensor proximity in a scanning sensor, in color calibrating incremental printers |
US20030063338A1 (en) | 2001-10-02 | 2003-04-03 | Gudaitis Algird M. | Color calibration color value correction |
US20060022122A1 (en) | 2004-07-30 | 2006-02-02 | Tan Boon K | Temperature compensation method and apparatus for color sensors |
US7098443B2 (en) | 2004-07-30 | 2006-08-29 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Temperature compensation method and apparatus for color sensors |
US20070177231A1 (en) | 2006-01-31 | 2007-08-02 | Xerox Corporation | Halftone independent color drift correction |
DE202007006342U1 (en) | 2007-01-29 | 2007-07-12 | Silicann Technologies Gmbh | Three-color detection system, for industrial automated applications, diverts part of the illuminating white light to a monitor to give reference and actual color values to compensate for drift |
DE102007015741B3 (en) * | 2007-03-30 | 2008-09-04 | Silicann Technologies Gmbh | Object detection method for industrial application, involves controlling space between object and channel, and carrying out correction of deviation between standard value and reference color value so that deviation lies within preset range |
US20080245954A1 (en) | 2007-04-03 | 2008-10-09 | Lite-On Semiconductor Corporation | Color sensitive device with temperature compensation and variable gain and display system using the same |
Also Published As
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DE202009018177U1 (en) | 2011-04-21 |
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