Error In A Colorimeter
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Errors in colorimetry caused by the measuring instrumentArticle (PDF Available) · January 1997 with 1,328 Reads1st Joanne C. sources of error in colorimetric analysis Zwinkels27.34 · National Research Council CanadaAbstractCalibration procedures required and reference
Colorimeter Percentage Error
materials available for wavelength scale, instrumental bandpass, stray light and photometric scale for industrial experimental errors in colorimetry and standardizing laboratories are reviewed. Systematic errors of sphere instruments such as single-beam absorption error, dark sample reading error and gloss trap error, and colourimetry errors the special problems of sample-instrument interaction with fluorescent and translucent materials are discussed and methods are given for reducing or correcting their effects. The influence of instrument operating parameters on accurate colorimetry is described.Discover the world's research10+ million members100+ million publications100k+ research projectsJoin for free CitationsCitations4ReferencesReferences00:45 Surface ColorArticle ·
Colorimetry Procedural Errors
· Color Research & ApplicationMaria E. NadalEdward A. EarlyRobert R. BousquetReadColour-measuring instruments and their calibration[Show abstract] [Hide abstract] ABSTRACT: The types of instruments used for colour measurement of self-luminous and surface colours, and the choices available for their optical design, are described. Guidelines are given for selection of measurement conditions appropriate to different measurement applications. The important steps in calibrating and verifying the performance of colour-measuring instruments are described and the standards available for these procedures are discussed in detail. Full-text · Article · May 1996 Joanne C. ZwinkelsRead full-textUncertainty analysis for reflectance colorimetry[Show abstract] [Hide abstract] ABSTRACT: The uncertainty associated with the quantitative description of the color of an object is often necessary for determining the acceptability of that object for its intended application. Uncertainties are also required for establishing the traceability of a measurement to a national metrology institute. A system
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CR-300 NEW CR-300-RH NEW Software CRI App Utilities SDK Downloads Firmware Applications Data Files Learning About Colorimeters Support Contact Correcting Tristimulus Colorimeters Errors The Four Color Matrix Method (FCMM) Brochure ORIGINS OF COLORIMETRY The human eye http://www.colorimetryresearch.com/learning/FCMM has three types of color sensors known as red, green and blue cone http://connection.ebscohost.com/c/articles/59375887/errors-colorimetry-caused-by-measuring-instrument cells which work together through the brain to give the perception of all colors. In the late 1920s William Wright and John Guild performed meticulous testing with groups of healthy young adults to determine the spectral responses of these three types of cone cells. In 1931 the C.I.E. (International Committee on error in Illumination) adopted these data as the CIE color-matching functions and defined the CIE 1931 XYZ color space. This work was so well performed that results remain essentially unchanged to the present day. Changes include interpolation of the original five nanometer data to one nanometer, and the addition of responses to low level illumination. WHAT A TRISTIMULUS COLORIMETER SHOULD DO The goal of any tristimulus colorimeter error in a is to measure a light source or display with responses matching the three CIE color-matching functions [x(λ), y(λ), z(λ)]. In order to do this the colorimeter typically employs some form of filter/detector combination. These may have either a single detector with sequentially applied filters or multiple detectors with filters. Filtering detector response to match the CIE color-matching functions is difficult. In fact, most commercial tristimulus colorimeters, including two dimensional colorimeters, have significant detector/filter f1' errors. Measurement results can be reasonably accurate when the colors are broadband as those derived from pigments and dyes (i.e., paints, fabrics or incandescent displays) because colorimeters are typically calibrated against NIST (National Institute of Standards and Technology) traceable CIE Illuminant A or 3000 K tungsten-halogen working standards, however the three primary colors (red, green, blue) that comprise the color gamut of LCD or LED displays are usually other than broadband. Hence, significant errors may be encountered when measuring the primary colors of a display, or any mix of them. CORRECTION METHODS The demand for accuracy of display colors requires improvement in accuracy in the instruments used to measure them. Some means must be used to
AUTHOR(S) Zwinkels, Joanne C. PUB. DATE January 1988 SOURCE Book of Papers, National Technical Conference of AATCC;1988, p100 SOURCE TYPE Conference Proceeding DOC. TYPE Article ABSTRACT A well-standardized measuring instrument is essential to precise and accurate colorimetry. This paper reviews the calibration procedures required and reference materials available for wavelength scale, instrumental bandpass (resolution), stray light and photometric scale, both from the point-of-view of standardizing and industrial laboratories. The peculiar systematic errors of sphere instruments, such as single-beam sample absorption error, dark sample reading error and gloss trap error, and the special problems of sample-instrument interaction with fluorescent and translucent materials are discussed in some detail, along with practical advice for reducing or correcting for their effects. Finally, the influence of instrument operating parameters on accurate colorimetry is described. ACCESSION # 59375887 Related ArticlesTHE CIE AND MESOPIC PHOTOMETRY.Adrian, Werner//Light & Engineering;2008, Vol. 16 Issue 4, p12The article offers information on the CIE and mesopic photometry. It states that in an outline of red and blue of equal luminance, both colors would fade if the light level is decreased. However, if the light level is increased in a light-adapted eye, red would appear much darker and blue would...astronomical color index.//Hutchinson Dictionary of Scientific Biography;2005, p1Difference in a star's brightness when measured on two selected wavelengths, in order to determine the star's temperature. Cooler stars emit more light at longer wavelengths (and so appear redder than hot stars). Modern methods involve photoelectric filtering and...Taking the measure of light.Matthews, Stephen J.//Laser Focus World;Jun2002, Vol. 38 Issue 6, p93Discusses the basic physical principles that underlie in complex instruments for the measuremen