WO2018011223A1 - Dispositif de mesure optoélectronique pour colorimètre - Google Patents

Dispositif de mesure optoélectronique pour colorimètre Download PDF

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Publication number
WO2018011223A1
WO2018011223A1 PCT/EP2017/067439 EP2017067439W WO2018011223A1 WO 2018011223 A1 WO2018011223 A1 WO 2018011223A1 EP 2017067439 W EP2017067439 W EP 2017067439W WO 2018011223 A1 WO2018011223 A1 WO 2018011223A1
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WO
WIPO (PCT)
Prior art keywords
measuring device
diffuser
light beams
sensor unit
measuring
Prior art date
Application number
PCT/EP2017/067439
Other languages
German (de)
English (en)
Inventor
Wolf-Dieter PRENZEL
Original Assignee
Net Se
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.)
Filing date
Publication date
Application filed by Net Se filed Critical Net Se
Publication of WO2018011223A1 publication Critical patent/WO2018011223A1/fr

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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
    • G01J3/506—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors measuring the colour produced by screens, monitors, displays or CRTs
    • 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
    • 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
    • G01J3/0208—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
    • 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
    • G01J3/0218—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using optical fibers
    • 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
    • G01J3/0229—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using masks, aperture plates, spatial light modulators or spatial filters, e.g. reflective filters

Definitions

  • the present application relates to an optoelectronic measuring device for a color measuring device, in particular a handheld colorimeter for use on screens, comprising at least one primary optics, at least one aperture, at least one diffuser and at least one sensor unit, wherein the measuring device is designed such that when the measuring device is present in a measuring state, light rays emanating from a measuring object strike the primary optics and are at least partially bundled by means of the primary optics, the primary optics being arranged relative to the diffuser such that the diffuser lies at least substantially in the focus of the primary optics, wherein the aperture is arranged in front of the diffuser in the direction of radiation of the light beams and limits an angle of incidence of the light beams, whereby the light beams can be homogenized by means of the diffuser, so that they are uniformly distributed on the diffuser from the diffuser
  • Sensor unit are conductive, wherein the light beams are convertible by means of the sensor unit into electrical signals, wherein the sensor unit of an integral
  • Multiple spectral sensor is formed, which has at least three sub-areas for detecting each different spectral components.
  • the present application relates to a method for operating a measuring device, comprising the following method steps:
  • the measuring device is aligned relative to the measuring object, so that of
  • the measuring device recorded on the color to be analyzed.
  • a "primary optics” is understood to mean an arrangement of at least one component which is suitable for the course of Page 2 of 19
  • a primary optic may comprise one or more lenses, for example condenser lenses or scattered lenses.
  • a "diaphragm” is understood to mean a device which prevents the passage of light beams and in this way can have an aperture-limiting effect
  • the diaphragm be formed by a so-called aperture diaphragm.
  • a "diffuser” is understood to be a device by means of which incident light can be homogenized, that is to say a light striking a diffuser is dissipated by the effect of the diffuser in such a way that the light emanates from an exit surface of the diffuser evenly distributed
  • Exit surface of the diffuser is in particular no discrete, punctiform light source recognizable. Instead, it typically appears that the light emits relatively uniformly, starting from the exit face of the diffuser.
  • a “sensor unit” is a unit by means of which it is possible to convert light beams into electrical signals, the conversion being possible depending on certain properties of the light beams. radiometric and colorimetric values of the respective light radiation, in particular the luminous flux, the luminous intensity or the luminance.
  • an "integral multiple spectral sensor” is understood to mean a sensor unit which is suitable for supplying different spectral fractions of detected light beams determine only a single
  • Measuring devices of the type described above are already known in the art. In particular, they can be used in combination with colorimeters that can be used to color-calibrate screens, such as monitors or televisions. For this purpose, light emitted by a respective measuring surface, for example the screen of a monitor, is emitted by means of the respective color measuring device Page 3 of 19 and examined for their condition.
  • This study can be done in different ways; In particular, it may be of interest to
  • Color rendering of the respective measurement object to determine. Based on the respectively recorded values, it is then possible to adjust the item being examined in such a way that, for example, the colors output are changed and thus adapted to "real" colors also suitable for compensating color changes occurring over the service life of the respective screen.
  • Color measuring devices which are suitable for such measurements are shown, for example, in the documents DE 10 2013 004 213 A1, EP 2 505 973 A2 and US 7,671, 991 B2
  • the said European patent application describes the structure of the measuring device used in the color measuring device presented there.
  • the known colorimeters have the particular disadvantage that they are relatively sensitive in their application. In particular, care must be taken that the measuring devices are aligned exactly with the respective measurement object in order to be able to carry out a reliable measurement. In practice, this sensitivity of the measurement results relative to the arrangement of the measuring device often
  • the present invention has for its object to produce a colorimeter that is as simple and reliable as possible compared to the prior art.
  • the object underlying the invention is achieved on the basis of the measuring device of the type described in the introduction in that the primary optics has at least one coherent lens body, which has two regions Page 4 of 19 different dispersion and / or a total of at least three refractive and / or reflective effective surfaces.
  • a "contiguous lens body” is understood to mean a component through which the light beam passes in such a way that the light beam enters the lens body at an entrance surface from the environment
  • the measuring device according to the invention has many advantages.
  • the primary optics according to the invention is suitable for reducing aberrations, in particular color aberrations (chromatic aberration) and sharpness aberrations (spherical aberration), preferably to eliminate them.
  • aberrations in particular color aberrations (chromatic aberration) and sharpness aberrations (spherical aberration)
  • chromatic aberration chromatic aberration
  • spherical aberration spherical aberration
  • Measuring object is. For example, this is reflected in the fact that the
  • Measuring device can also achieve usable measurement results, if it is aligned or arranged obliquely to a measuring surface of the measuring object and / or spaced from the same.
  • Primary optic further preferably from the primary optic view on this side of the
  • the primary optics should be tuned and cooperate with the diaphragm such that at least substantially only those light beams reach the diffuser which extend at least substantially parallel to an optical axis of the measuring device before a first deflection or deflection by the primary optics , Page 5 of 19
  • the measuring device is overall very robust against incidental extraneous light from the side, for example against incident ambient light, as this does not reach the diffuser due to the vote of the optics.
  • the measuring device is overall very robust against incidental extraneous light from the side, for example against incident ambient light, as this does not reach the diffuser due to the vote of the optics.
  • Measuring device be designed such that only such light rays on the diffuser, which meet at an angle of incidence of less than 10 °, preferably less than 5 °, on an entrance surface of the measuring device.
  • the primary optics may for example comprise a lens body having only a portion of a dispersion, wherein the
  • Lensenharmonic Lensenharmonic Lensenharmonic Lensenharmonic Lensenharmonic Lens is formed by a TIR collimator lens with at least three reflective and / or refractive surfaces.
  • Such a primary optics achieves a deflection of the light beams emanating from the measurement object at least partially by means of reflection at an aspherically curved rear surface of the associated lens. Reflections do not lead to the known aberrations, so that the primary optics has at least a significantly increased quality of the light pipe to the diffuser. Furthermore, it may be advantageous if the lens body has two areas
  • the lens body is formed by a two-lingual Achromaten.
  • this two lenses of the achromat are directly connected to each other, wherein one of the lenses has a positive and the other lens has a negative refractive power.
  • Such a lens body or a primary optic equipped with such a lens is also at least substantially free of
  • Achromats is designed to also achieve a correction of the sharpness error in addition to a correction of the color aberration.
  • the measuring device according to the invention also has the advantage that it builds comparatively compact.
  • Construction method are also used while maintaining a typical length equal to the measuring surface of the measurement object, from which light rays entering the measuring device and thus can be evaluated, to increase in comparison to the prior art.
  • a ratio between the measuring surface of the test object and the sensor surface of the sensor unit is at least 1: 150, preferably at least 1: 125, more preferably at least 1: 100.
  • the integral multiple spectral sensor is formed by an integral RGB sensor having at least three different types of sub-areas, one of the sub-areas being designed to detect a red, a green and a blue spectral component of the light beams.
  • an integral RGB sensor can be formed by a large number of individual sensors, each of which has three subareas.
  • the different sensitivities of the partial surfaces for the desired spectral components can be formed, for example, by means of integral color filters which are arranged directly on the respective partial surface.
  • the sensor unit of the measuring device in a particularly small distance behind the diffuser, advantageously at a distance of not more than 2 mm, preferably not more than 1 mm, more preferably not more than 0.5 mm. These distances are understood in the direction of radiation of the respective light beams.
  • outlet surface of the diffuser and a sensor surface of the sensor unit have an at least substantially, preferably completely, coincident aperture.
  • the diffuser and the sensor unit are matched directly to one another, wherein due to the arrangement of the two components directly one behind the other, the surfaces thereof can be formed virtually identical.
  • the measuring device according to the invention can be supplemented with a further lens with positive refractive power.
  • a further lens with positive refractive power.
  • Such a lens is suitable for further focusing the light beams impinging on it and in this way shortening the overall length of the measuring device as a whole.
  • the further lens is advantageously arranged between the continuous lens body and the diffuser.
  • the measuring device is equipped with a secondary optics, which is viewed in the radiation direction of the light rays between the diffuser and the sensor unit.
  • the secondary optics is to Page 7 of 19 suitable to direct outgoing light rays from the diffuser on the sensor unit. Such an arrangement may be required if the sensor unit is not to be located immediately behind the diffuser.
  • Such secondary optics may be formed, for example, by a light guide, wherein a cross section of the light guide must be adapted at its respective ends in each case to the apertures of the diffuser or the sensor unit. It is also conceivable to form a secondary optic from a lens, in particular from a gradient lens, and to achieve an approximation between the apertures of the diffuser and the sensor unit by means of the secondary optics. Furthermore, it is advantageous regardless of the other embodiment of the measuring device according to the invention, when the diffuser is formed of quartz glass. A diffuser formed by quartz glass in particular has the advantage that the spectral properties of the light rays striking the diffuser are not changed.
  • a diffuser formed by quartz glass has a plurality of internal scattering centers, which are important for a particularly pronounced homogenization of the light striking the diffuser.
  • Such a diffuser emits light in all directions evenly and thus acts as Lambert radiator.
  • quartz glass diffuser is particularly well suited to disperse the light striking it.
  • quartz glass diffusers are characterized by a complete depolarization and an extreme long-term stability and UV resistance compared to conventional diffusers.
  • the diffuser has a thickness measured in the direction of radiation of the light rays of at least 0.3 mm, preferably at least 0.5 mm, more preferably at least 1 mm , having. Such a thickness of the diffuser is in view of
  • Measuring device with respect to a surface normal, which is perpendicular to an emission surface of the measurement object, aligned twisted, so that the optical axis and the surface normal together include an angle greater than 0 °.
  • Page 8 of 19
  • This method step is particularly easy to carry out by means of the measuring device according to the invention.
  • the method is advantageous insofar as the twisted alignment of the measuring device relative to the measurement object is even possible, while in the prior art in each case a conscientious error-prone alignment is required, which nevertheless has a relatively high error rate.
  • the method according to the invention is particularly simple and quick to carry out, whereby the comfort for the user of the measuring device is significantly increased.
  • the optical axis is aligned in an angular range between and 20 °, preferably between 1 ° and 17.5 °, more preferably between 1 ° and 15 °, relative to the surface normal.
  • the measuring device when the primary optics is adapted to forward only substantially parallel incident on the measuring device light rays to the diffuser, the measuring device can be arranged before the measurement at a distance from the measurement object, the distance a maximum of 40 cm, preferably a maximum 35 cm, more preferably at most 30 cm.
  • the light input of ambient light into the measuring device associated with such a spaced arrangement has no
  • such a method may be advantageous in which a plurality of measurements of the test object (6) are made within the scope of a measuring operation, wherein the optical axis of the measuring device in the course of performing the individual measurements in different angular positions relative to the surface normal of
  • Target is aligned.
  • the individual measurements can be carried out very quickly and simply and together lead to a kind of "average value" for the actual color values of the measurement object to be determined a particularly high accuracy possible.
  • FIG. 1 shows a schematic cross section through a first invention
  • FIG. 3 shows a cross section through an integral multiple spectral sensor
  • FIG. 4 shows a cross section through a second measuring device according to the invention
  • FIG 5 shows a cross section through a third measuring device according to the invention.
  • FIG. 1 A first embodiment shown in FIG. 1
  • This comprises a primary optics 2, a diaphragm 3, a diffuser 4 and a sensor unit 5.
  • the individual components of the measuring device 1 are arranged symmetrically with respect to an optical axis 21.
  • An input aperture of the measuring device 1 is by means of a housing 20 of a non-illustrated
  • the measuring device 1 In this position shown in FIG. 1, the measuring device 1 is in its measuring state in which it is used for detecting light beams 7 emanating from a measuring object 6.
  • the housing 20 delimits a measuring surface 18 of the measuring object 6, from which light beams 7 are detected by means of the measuring device 1 according to the invention.
  • light beams 7 are graphically illustrated by arrows.
  • the measuring device according to FIG. 1 uses a primary optic 2 which has a continuous lens body 29 in the form of an aspherical lens 15. This is designed here as a TIR collimator lens. This leads to that on the part of the
  • the aspherical lens 15 has a recess 30 in an end region facing away from the measurement object 6. This has the consequence that the light rays 7 flowing through the lens 15 are broken away from the solder 28 at surfaces 9 at which the lens 15 adjoin one another to the recess 30. This can be seen particularly clearly in FIG. 1 with reference to the illustrated arrows.
  • the diaphragm 3 On a side of the primary optics 2 facing away from the measuring object 6, the diaphragm 3 is arranged, which limits the angle of incidence of the light beams 7.
  • the primary optic 2 shown is formed almost exclusively to the optical axis 21 Page 10 of 19 parallel to the primary optics 2 entering light rays 7 reach the diffuser 4.
  • the latter is viewed in the direction of radiation of the light rays 7, viewed immediately behind the diaphragm 3.
  • the diffuser 4 which is arranged here in front of a focal plane of the lens 15, light passing through the diaphragm 3 can be homogenized.
  • the diffuser 4 is formed here by quartz glass. It has a rear exit surface 10, from which light is emitted from the diffuser 4. Immediately behind the diffuser 4 is the
  • Sensor unit 5 is arranged, which is formed here in the form of an integral multiple spectral sensor.
  • the sensor unit 5 has a sensor surface 11 facing the exit surface 10 of the diffuser 4.
  • a distance between the exit surface 10 of the diffuser 4 and the sensor surface 11 of the sensor unit 5 is approximately 0.5 mm in the example shown. 1, it can be seen particularly clearly that the sensor unit 5 can be arranged "directly" behind the diffuser, without the need for secondary optics or the like, and it is understood that an overall length 27 of the measuring device 1 is particularly short in this way can fail.
  • the diffuser 4 here has a thickness 14 of 0.5 mm and a diameter 23 of 3 mm. It is formed with a circular cross-section and thus has a
  • the diffuser 4 has in its interior a plurality of scattering centers 22, at which light rays 7 entering it are scattered. This type of scattering causes the light rays after Transluzens at the exit surface 10 of the diffuser 4 evenly emerge from the latter according to a Lambert radiator.
  • a distribution of the light radiation after emerging from the exit surface 10 can be taken from the diagram shown in FIG. 2, wherein the axis 24 describes the radiation intensity of the light emitted by the exit surface 10 as a function of the emission angle.
  • a sensor unit 5 which according to the invention of an integral
  • Multi-spectral sensor is formed, is shown by way of example in Figure 3.
  • the sensor unit 5 shown there is formed by an integral RGB sensor which has a total of 19 individual sensors 25 which are integrated on a chip substrate. Each of these sensors 25 comprises three sub-areas 8, one of the sub-areas 8 being designed to detect green, red and blue light. Overall, the sensor unit 5 has a hexagonal shape, wherein the individual sensors 25 are each hexagonal. A diameter 26 of the sensor unit 5 has approximately 3 mm here.
  • FIG. 4 Another embodiment shown in FIG. 4 has one
  • the secondary optics 12 of the measuring device 1 according to FIG. 4 can be used, for example, to direct light emitted by the diffuser 4 to a remote sensor unit 5.
  • the secondary optics 12 make it possible to adapt the aperture of the diffuser 4, which is delimited by the diaphragm 3, to the aperture of the sensor unit 5.
  • it is necessary that a cross section of the light guide is adapted to the respective apertures at the respectively corresponding ends on the diffuser 4 and the sensor unit 5.
  • the primary optic 2 of the measuring device 1 according to FIG. 4 is here formed by a total of three lenses 16, 17, 19, with a convex lens 16 with positive refractive power combined with a concave lens 17 with negative refractive power than more coherent
  • Lens body 29 is executed. These two lenses 16, 17 are matched with respect to their common surface 9 and their dispersions such that the lens body 29 is suitable for the correction of both the chromatic and the spherical aberration. Viewed in the direction of radiation of the light beams 7, the lenses 16, 17 are followed by the further lens 19, which has a positive refractive power and thereby further focuses the light beams 7 impinging on them.
  • the lens body 29 formed by the lenses 16, 17 with the further lens 19 with a positive refractive power an overall length 27 of the measuring device 1 can be reduced particularly well, while at the same time display errors are corrected by the action of the lens body 29.
  • this embodiment also makes it possible, while maintaining a "normal" length 27, to detect a comparatively large measuring surface 18 and thereby, despite a small size
  • the diffuser 4 is arranged behind the focal plane of the primary optics 2.
  • the primary optics 2 is overall tuned together with the diaphragm 3 such that almost exclusively such light beams 7 reach the diffuser 4, which are aligned at least substantially parallel to the optical axis 21.
  • the measuring device 1 according to FIG. 5 has a different secondary optic 12, here of a gradient optics 13 Page 12 of 19 is formed.
  • the secondary optics 12 is adjoined off the diffuser 4 by a sensor unit 5, which is also formed here by an integral multiple spectral sensor.
  • the measurement object 6 is arranged at an angle relative to the optical axis 21 of the measuring device 1.
  • a surface normal of the measuring object 6 includes here with the optical axis 21 an angle 31 of about 5 °.

Abstract

L'invention concerne un dispositif de mesure optoélectronique (1) destiné à un colorimètre, en particulier à un colorimètre portable utilisé pour des écrans, comportant au moins une optique primaire (2), au moins un diaphragme (3), au moins un diffuseur (4) et au moins une unité de détection (5). Le dispositif de mesure (1) est conçu de telle manière que dans le cas où le dispositif de mesure (1) se trouve dans un état de mesure, les rayons lumineux (7) provenant d'un objet à mesurer (6) atteignent l'optique primaire (2) et peuvent être au moins en partie concentrés par l'optique primaire (2). L'optique primaire (2) est agencée par rapport au diffuseur (4) de telle manière que le diffuseur (4) se trouve au moins sensiblement dans le foyer de l'optique primaire (2). Le diaphragme (3) est agencé en amont du diffuseur (4) vu dans la direction du rayonnement des rayons lumineux (7), et délimite un angle d'incidence des rayons lumineux (7). Les rayons lumineux (7) peuvent être homogénéisés au moyen du diffuseur (4), de sorte qu'ils peuvent être dirigés uniformément sur l'unité de détection (5) à partir du diffuseur (4), les rayons lumineux (7) pouvant être convertis en signaux électriques au moyen de l'unité de détection (5). Le dispositif de mesure est caractérisé en ce que l'unité de détection (5) est constituée d'un capteur multispectral intégral qui présente au moins trois surfaces partielles (8) détectant chacune des composantes spectrales différentes. L'invention vise à proposer un colorimètre qui soit utilisable le plus simplement et le plus faiblement possible par comparaison avec l'état de la technique. À cet effet, l'optique primaire (2) présente au moins un corps de lentille continu (29) qui comprend deux zones présentant une dispersion différente et/ou dans l'ensemble au moins trois surfaces (9) présentant un effet réfractif et/ou réfléchissant.
PCT/EP2017/067439 2016-07-12 2017-07-11 Dispositif de mesure optoélectronique pour colorimètre WO2018011223A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016112750.7 2016-07-12
DE102016112750.7A DE102016112750A1 (de) 2016-07-12 2016-07-12 Opto-elektronische Messeinrichtung für ein Farbmessgerät

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WO2018011223A1 true WO2018011223A1 (fr) 2018-01-18

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DE102018208185A1 (de) 2018-05-24 2019-11-28 Robert Bosch Gmbh Optisches Element zur Lichtkonzentration und Herstellungsverfahren für ein optisches Element zur Lichtkonzentration
EP4206628A1 (fr) * 2021-12-29 2023-07-05 X-Rite Europe GmbH Dispositif de mesure de couleur doté d'un système optique compact

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Publication number Priority date Publication date Assignee Title
EP0772345A2 (fr) * 1995-11-01 1997-05-07 Xerox Corporation Dispositif de colorimétrie, lustre et contre-réaction d'alignement dans un appareil d'impression en couleurs
US7671991B2 (en) 2006-04-10 2010-03-02 X-Rite Europe Gmbh Handheld colour measurement device
EP1936337A1 (fr) * 2006-12-21 2008-06-25 Gretag-Macbeth AG Tête manométrique et dispositif de balayage et dispositif de balayage équipé de celle-ci
EP2505973A2 (fr) 2011-04-01 2012-10-03 X-Rite Europe GmbH Colorimètre manuel
US20130027696A1 (en) 2011-07-26 2013-01-31 Olympus Corporation Wavelength distribution measuring apparatus
DE102013004213A1 (de) 2013-03-12 2014-09-18 Display-Messtechnik & Systeme GmbH & Co. KG Bildgebendes Farbmessgerät mit hoher Genauigkeit

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