DD297241A5 - METHOD FOR POINTLY DETERMINING THE SPECTRAL REMISSIONING FUNCTION BY MEANS OF AN OPTOELECTRONIC COLOR MEASURING HEAD - Google Patents
METHOD FOR POINTLY DETERMINING THE SPECTRAL REMISSIONING FUNCTION BY MEANS OF AN OPTOELECTRONIC COLOR MEASURING HEAD Download PDFInfo
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- DD297241A5 DD297241A5 DD90343434A DD34343490A DD297241A5 DD 297241 A5 DD297241 A5 DD 297241A5 DD 90343434 A DD90343434 A DD 90343434A DD 34343490 A DD34343490 A DD 34343490A DD 297241 A5 DD297241 A5 DD 297241A5
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- German Democratic Republic
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- optoelectronic
- radiation
- sample
- optoelectronic radiation
- receiver
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- 230000005693 optoelectronics Effects 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000003595 spectral effect Effects 0.000 title claims abstract description 13
- 230000005855 radiation Effects 0.000 claims abstract description 48
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 claims abstract description 3
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000002745 absorbent Effects 0.000 claims 1
- 239000002250 absorbent Substances 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 238000005286 illumination Methods 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 abstract description 3
- 230000004907 flux Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
-
- 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
- G01J3/0251—Colorimeters making use of an integrating sphere
-
- 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
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/501—Colorimeters using spectrally-selective light sources, e.g. LEDs
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
- G01N21/474—Details of optical heads therefor, e.g. using optical fibres
-
- 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
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
- G01J2003/102—Plural sources
- G01J2003/104—Monochromatic plural sources
-
- 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
- G01J3/0272—Handheld
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N2021/3181—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using LEDs
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
- G01N21/474—Details of optical heads therefor, e.g. using optical fibres
- G01N2021/4752—Geometry
- G01N2021/4757—Geometry 0/45° or 45/0°
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Health & Medical Sciences (AREA)
- Spectrometry And Color Measurement (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Die Erfindung betrifft ein Verfahren zur punktualen Ermittlung der spektralen Remissionsfunktion mittels eines optoelektronischen Farbmeszkopfes und dient zur Bestimmung der Farbwerte von festen, fluessigen und gasfoermigen Stoffen. Erfindungsgemaesz wird die zu messende Probe durch n optoelektronischen Strahlungssender * (LED, LD, entsprechend dotierte Halbleiter) n-mal mit Licht unterschiedlicher, schmaler spektraler Bandbreite bestrahlt, der von der Probe (13) remittierte Strahlungsflusz von einem optoelektronischen Strahlungsempfaenger (11) in ein Stromsignal gewandelt und zur weiteren Verarbeitung (z. B. Berechnung der CIE-Farbmaszzahlen nach dem Gewichtsordinatenverfahren) bereitgestellt. Als Referenz dient ein Weiszstandard. Fig. 1{Farbmessung; Farbwert; Remissionsfunktion; optoelektronische Bauelemente; Leuchtdioden; Laserdioden; optoelektronische Strahlungsquelle; optoelektronischer Strahlungssender; Gewichtsordinatenverfahren; CIE-Farbmaszzahlen}The invention relates to a method for the punctual determination of the spectral reflectance function by means of an optoelectronic Farbmeszkopfes and is used to determine the color values of solid, liquid and gasfoermigen substances. According to the invention, the sample to be measured is irradiated n times with light of different narrow spectral bandwidth by n optoelectronic radiation emitter * (LED, LD, correspondingly doped semiconductors), the radiation flux remitted by the sample (13) from an optoelectronic radiation receiver (11) Current signal converted and provided for further processing (eg calculation of the CIE color number by weight coordinate method). The reference is a Weisz standard. Fig. 1 {color measurement; Color value; Remission function; optoelectronic components; light emitting diodes; laser diodes; optoelectronic radiation source; optoelectronic radiation emitter; Gewichtsordinatenverfahren; CIE Farbmaszzahlen}
Description
Hierzu 2 Seiten ZeichnungenFor this 2 pages drawings
Die Erfindung bezieht sich auf das Gebiet der Spektralfotometrie und kann zur Kontrolle/Überwachung von verfahrenstechnischen Prozessen, in denen spektrale Veränderungen oder zeitliche Konstanz von Materialien im sichtbaren und nahen infraroten Bereich von Bedeutung sind, sowohl in großtechnischen Anlagen als auch in der Forschung zur schnellen, genauen und billigen Farbmessung eingesetzt werden.The invention relates to the field of spectrophotometry and can be used to control / monitor process processes in which spectral changes or temporal constancy of materials in the visible and near infrared range are important, both in large-scale facilities and in research for rapid, accurate and cheap color measurement can be used.
Nach GB: G01N 21/27 216542 ist bekannt, daß Anordnungen mit 1 roten, 1 grünen, 2 blauen LED und einem Empfänger dazu geeignet sind, Meßwerte von Proben zu erhalten, welche bezogen auf die Referenzwerte eines Weißstandardes durchaus dazu verwendet werden können, Farben zu charakterisieren bzw. einmal gemessene Farben wiederzuerkennen, wobei in genanntemAccording to GB: G01N 21/27 216542 it is known that arrangements with 1 red, 1 green, 2 blue LED and a receiver are suitable for obtaining measured values of samples which can definitely be used for reference to the reference values of a white standard to characterize or once again recognized colors, wherein in said
Patent die Meßzeit sehr lang Ist, da nach jeder Bestrahlung der Probe mittels einer LEO eine Weißstandardplatte mechanisch heruntergeklappt werden muß, um den erforderlichen Referenzwert zu erhalten.Patent the measuring time is very long, since after each irradiation of the sample by means of a LEO a white standard plate must be mechanically folded down to obtain the required reference value.
Weiterhin Ist ein Verfahren .zum schnellen Erfassen und Charakterisieren von Farbtönen opaker und transparenter Materialien vorzugsweise an schnellaufenden, partiell eingefärbten Materialbahnen" bekannt (OD: QOIJ 3/50 99439). Wobei .eine oder mehrere sequentiell ansteuerbare in eng begrenzten Strahlungsbereichen emittierende Strniilungsquellen" eine .eng begrenzte Fläche des Meßgutes beleuchten, von der die remlttlerte/transmittierte Strahlung in einen Strahlungsempfänger gelangt" und zur Berechnung von «Remissionsgraddlfferenzen, optischen Dichten, relativen Kontrasten oder Integralen der Remissionsfunktion über bestimmte Wellenlängenbereiche, allgemein zur Erzeugung der für die Anzeige, Registration und Regelung des Einfärbeprozesses erforderlichen Ausgangssignale" verwendet wird.Furthermore, a method is known for the rapid detection and characterization of shades of opaque and transparent materials, preferably on high-speed, partially dyed material webs (OD: QOIJ 3/50 99439), whereby one or more sequentially controllable radiation sources emitting in narrowly limited radiation ranges are known illuminate a limited area of the specimen from which the transmitted / transmitted radiation passes into a radiation receiver, and for calculating reflectance gradings, optical densities, relative contrasts or integrals of the reflectance function over particular wavelength ranges, generally for generating the ones for display, registration, and Control of the inking process required output signals "is used.
Ziel der Erfindung Ist die Entwicklung eines billigen, robusten und leicht zu realisierenden Verfahrens zur Farbmessung von festen, flüssigen und gasförmigen Stoffen.OBJECT OF THE INVENTION The development of a cheap, robust and easy to implement method for color measurement of solid, liquid and gaseous substances.
zu entwickeln, welches kleine Meßausschnitte realisiert, den Einfluß des Glanzes der Probe (13) ausschließt, unabhängig vonto develop, which realizes small Meßausschnitte excludes the influence of the gloss of the sample (13), regardless of
begrenzten Bereichen emittierende optoelektronische Strahlungsquellen (D1 ...On) beleuchtet wobei die optoelektronischenlimited areas emitting optoelectronic radiation sources (D1 ... On) illuminated the optoelectronic
beleuchteten Fläche der Probe (13) bilden.form illuminated area of the sample (13).
in den optoelektronischen Strahlungsempfänger (11) und wird In ein Stromsignal gewandelt, woraus man bezogen auf denin the optoelectronic radiation receiver (11) and is converted into a current signal, from which one based on the
pro optoelektronischer Strahlungsquelle (D1 ...Dn) einen Punkt des Remissionsspektrums erhält. Dabei ist β der Remissionsgradone point of the remission spectrum per optoelectronic radiation source (D1 ... Dn). Where β is the remission degree
Φρ der auf die Probe (13) fallende Strahlungsfluß,Φρ the radiation flow incident on the sample (13),
Φη der auf das Normalweiß fallende Strahlungsfluß,Φη the falling on the normal white radiation flux,
δΦδΦ
— die spektrale Strahldichteverteilung des optoelektronischen Strahlungssenders (D 1... Dn)The spectral radiance distribution of the optoelectronic radiation transmitter (D 1 ... Dn)
δλδλ
βρ(λ) der spektrale Remissionsgrad der Probe (13)βρ (λ) the spectral reflectance of the sample (13)
βΝ(λ) der Spektrale Remissionsgrad von Normalweißβ Ν (λ) the spectral reflectance of normal white
ε(λ) Spektralempfindlichkeit des optoelektronischen Empfängers (11)ε (λ) Spectral sensitivity of the optoelectronic receiver (11)
Als optoelektronische Strahlungsquellen (D 1... Dn) werden dabei LED, LD bzw. in geeigneter Weise dotierte Halbleiterkristalle/ Halbleiteranordnungen verwendet. Dabei ist die Genauigkeit des Meßwertes des spektralen Remissionsgrades um so höher, je geringer die spektrale Bandbreite der optoelektronischen Strahlungssender (D 1... Dn) ist.As optoelectronic radiation sources (D 1 ... Dn) thereby LED, LD or suitably doped semiconductor crystals / semiconductor devices are used. In this case, the lower the spectral bandwidth of the optoelectronic radiation transmitters (D 1... Dn), the higher the accuracy of the measured value of the spectral reflectance.
Aus den η spektralen Remissionsgraden erhält man durch Interpolation das Remissionsspektrum, welches z. B. zur Berechnung der CIE-FarbmaPzahlen bzw. anderer interessierender Größen verwendet werden kann.From the η spectral remission grades obtained by interpolation, the remission spectrum, which z. B. can be used to calculate the CIE FarbmaPzahlen or other interesting sizes.
(in der Abbildung ist der optoelektronische Farbmeßkopf mit der Meßgeometrie 45/0 und 12 optoelektronischen Strahlungssendern (D1 ...Dn) realisiert),(In the figure, the optoelectronic color measuring head with the measuring geometry 45/0 and 12 optoelectronic radiation transmitters (D1 ... Dn) is realized),
Fig. 2; Blockschaltbild zur sequentiellen Ansteuerung der optoelektronischen Stra ilungssender (D 1... Dn) und Weiterverarbeitung der gewonnenen Meßwerte des optoelektronischen St> ahlungsempfängers (11) Impulsgenerator (1) erzeugt Impulse definierter Impulsbreite, welche dem mpulsteiler (2) und den LED-Treibern (3) zur Verfugung gestellt werden, wobei die LED-Treiber (3) für die Zeitdauer des Impulses über die jeweilige Konstantstromquelle (S 1 ...Sn) einen definierten, konstanten Impulsstrom für den jeweiligen »m Ausgang angeschlossenen optoelektronischen Strahlungssender (D1... Dn) erzeugen.Fig. 2; Block diagram for the sequential control of the optoelectronic radiation transmitters (D 1... Dn) and further processing of the measured values of the optoelectronic radiation receiver (11) Pulse generator (1) generates pulses of defined pulse width, which are supplied to the pulse divider (2) and the LED drivers ( 3) are made available, wherein the LED driver (3) for the duration of the pulse via the respective constant current source (S 1 ... Sn) a defined, constant pulse current for each m connected output optoelectronic radiation transmitter (D1 .. Dn).
übernommen und vom Rechner initialisiert wird.taken over and initialized by the computer.
konfiguriert sind, co daß eine sequentielle Ansteuerung der optoelektronischen Strahlungssender (01 ...Dn) für einebestimmte Anzahl von Impulsen, die vom Teilerverhältnis des Impulsteilera (2) bestimmt werden, erfolgt.are configured to sequentially drive the optoelectronic radiation emitters (01 ... Dn) for a given number of pulses determined by the divider ratio of the pulse divider (2).
optoelektronischen Strahlungssender (D 1... Dn) übereinstimmt und somit eine kontinuierliche sequentielle Ansteuerungerreicht wird.optoelectronic radiation emitter (D 1 ... Dn) and thus a continuous sequential drive is achieved.
optoelektronischen Strahlungssendern (D1.... Dn) eine beliebige Anzahl I von optoelektronischen Strah'ungssendem(D 1...Dn) auszuwählen und nur diese in den Meßvorgang elnzubeziehen.Optoelectronic radiation emitters (D1 .... Dn) to select any number I of optoelectronic Strah'ungssendem (D 1 ... Dn) and only these include in the measurement process.
im Steuerlogikcontroller (9) bereitgestellt wird, die gleichzeitig Einfluß nimmt auf die S & H-Schaltung (7) und ADU (8)und somit einen Synchronlauf von Sende· und Empfangseinheit gewährleistet.is provided in the control logic controller (9), which simultaneously influences the S & H circuit (7) and ADU (8) and thus ensures synchronous operation of transmitting and receiving unit.
umgesetzt, die im Verstärker (5) und Filter (6) vorverarbeitet, von Störsignalen getrennt und aufgrund der kurzenimplemented in the amplifier (5) and filter (6) preprocessed, separated from interfering signals and due to the short
rechentechnischen Auswertung, welch» spezielle Software realisiert wird, für den Anwender zur Verfügung gestellt.computational evaluation, which »special software is realized, provided for the user.
Claims (9)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD90343434A DD297241A5 (en) | 1990-08-14 | 1990-08-14 | METHOD FOR POINTLY DETERMINING THE SPECTRAL REMISSIONING FUNCTION BY MEANS OF AN OPTOELECTRONIC COLOR MEASURING HEAD |
DE4120749A DE4120749A1 (en) | 1990-08-14 | 1991-06-24 | Ascertaining spectral remission function at set point - using opto-electronic colour measuring head and LEDs as radiation transmitter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD90343434A DD297241A5 (en) | 1990-08-14 | 1990-08-14 | METHOD FOR POINTLY DETERMINING THE SPECTRAL REMISSIONING FUNCTION BY MEANS OF AN OPTOELECTRONIC COLOR MEASURING HEAD |
Publications (1)
Publication Number | Publication Date |
---|---|
DD297241A5 true DD297241A5 (en) | 1992-01-02 |
Family
ID=5620238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DD90343434A DD297241A5 (en) | 1990-08-14 | 1990-08-14 | METHOD FOR POINTLY DETERMINING THE SPECTRAL REMISSIONING FUNCTION BY MEANS OF AN OPTOELECTRONIC COLOR MEASURING HEAD |
Country Status (2)
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DD (1) | DD297241A5 (en) |
DE (1) | DE4120749A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9401392D0 (en) * | 1994-01-25 | 1994-03-23 | Kodak Ltd | Identification of image-forming material type |
DE4413594A1 (en) * | 1994-04-20 | 1995-10-26 | Siemens Ag | Sensor arrangement for color detection of object surfaces |
DE19511534C2 (en) * | 1995-03-29 | 1998-01-22 | Fraunhofer Ges Forschung | Method and device for detecting 3D defects in the automatic inspection of surfaces with the aid of color-capable image evaluation systems |
DE19528855A1 (en) * | 1995-08-05 | 1997-02-06 | Leybold Ag | Method and device for spectral reflectance and transmission measurement |
DE19617009C2 (en) * | 1996-04-27 | 1999-05-20 | Roland Man Druckmasch | Photoelectric measuring device |
EP0864931A1 (en) * | 1997-03-10 | 1998-09-16 | Xeikon Nv | A reflectometer and method for monitoring the density of printed material |
FI108675B (en) | 1998-06-23 | 2002-02-28 | Ambertec Oy | Method and apparatus for determining fiber orientation from a paper sample |
WO2004079314A1 (en) * | 2003-03-05 | 2004-09-16 | Brytech Inc. | Colorimeter, colorimeter sensor unit and colour determination process |
US7502112B2 (en) | 2004-12-23 | 2009-03-10 | Brytech Inc. | Colorimetric device and colour determination process |
DE102009053093A1 (en) * | 2009-11-13 | 2011-05-19 | Mühlbauer Ag | Method for determining color of color section of multi-color band for thermal transfer printer utilized for printing smart card, involves outputting signal that depicts determined color of illuminated section of multi-color band |
WO2013031917A1 (en) * | 2011-08-30 | 2013-03-07 | 関西ペイント株式会社 | Assessment method and assessment device for pigment dispersion |
DE102013003558B4 (en) * | 2013-03-01 | 2022-10-06 | Rodenstock Gmbh | System for determining the contrast of color pigments in tinted glasses |
US10746599B2 (en) * | 2018-10-30 | 2020-08-18 | Variable, Inc. | System and method for spectral interpolation using multiple illumination sources |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD99439A1 (en) * | 1972-03-30 | 1973-08-13 | ||
DE3145633A1 (en) * | 1981-11-17 | 1983-08-11 | Byk-Mallinckrodt Chemische Produkte Gmbh, 4230 Wesel | DEVICE FOR MEASURING COLORS |
DE3418839A1 (en) * | 1984-05-21 | 1985-11-21 | Hoelzle & Chelius GmbH, 6078 Neu Isenburg | Device for colorimetry/photometry |
DE3626373A1 (en) * | 1986-08-05 | 1988-02-18 | Fritz Kurandt | DEVICE FOR QUICK COLOR MEASUREMENT ON DIFFERENT SAMPLES |
DE3879896D1 (en) * | 1987-12-03 | 1993-05-06 | Siemens Ag | COLOR SENSOR ARRANGEMENT FOR DETECTING OBJECTS WITH COLORED SURFACES. |
-
1990
- 1990-08-14 DD DD90343434A patent/DD297241A5/en not_active IP Right Cessation
-
1991
- 1991-06-24 DE DE4120749A patent/DE4120749A1/en not_active Withdrawn
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DE4120749A1 (en) | 1992-02-20 |
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