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Colorimetric practice. Colour measuring instruments Lightsource colorimetry Luminance and brightness description Measurement of materials: colour recipe, fluorescence, signal colours. Instruments. Tristimulus colorimeters Spectroradiometers scanning, band-width and sampling

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colorimetric practice
Colorimetric practice
  • Colour measuring instruments
  • Lightsource colorimetry
  • Luminance and brightness description
  • Measurement of materials: colour recipe, fluorescence, signal colours
instruments
Instruments
  • Tristimulus colorimeters
  • Spectroradiometers
    • scanning, band-width and sampling
    • CCD type, missed details
  • Image forming colorimeters
tristimulus colorimeter
Tristimulus colorimeter
  • Luminace and illuminance measuring
tristimulus filters
Tristimulus filters
  • Sandwich type filters
  • Partial filtering
goodness of fit evaluation
Goodness of fit evaluation
  • Spectral mismatch error description
angular responsivity
Angular responsivity
  • Illuminace type:
    • cosine corrected
  • Luminance type:
    • narrow beam measurement:
    • 0.5 ° … 2°opening angle
  • Image forming colorimeter
    • problem with contrast, induction and assimilation
spectroradiometry
Spectroradiometry
  • Optics of the equipment
  • Bandwidth
  • Stray light
  • Single and double monochromators
  • Detection
    • photomultipliers
    • CCD arrays
spectroradiometry1
Spectroradiometry
  • Spectral irradiance measurement
  • Spectral radiance and flux measurement
  • The spectroradiometer
  • Measurement principles
  • Practical measurements
monochromators 1
Monochromators - 1
  • Light grasp or etendu, throughput, efficiency:
  • Double monochromator:
    • Two gratings (additive, subtractive dispersion)
    • grating + prism
monochromators 2
Monochromators - 2
  • Stray radiationDetermination with
    • Interference filter:
    • Sharp cut-off filters
    • Lasers
  • Wavelength accuracy: +/- 0,1 nm
    • stability
    • temperature dependence: 0,1 - 0,5 nm/C°
detector and measuring system
Detector and measuring system
  • Irradiation of detector - homogeneity
  • Type of detector: photomultiplier, Si-cell
    • linearity (superposition)
    • temperature dependence
    • high voltage stability
  • Standard sources
  • Method of measurement
method of measurement
Method of measurement
  • Sequence: test - standard
  • Transmittance function - Bandwidth
grating monochromator
Grating monochromator
  • Second order specrum, cutting by filters or a prisn pre-disperser
ccd type detector systems
CCD type detector systems
  • Single grating
    • stray light
    • second order
  • Detector system
    • Pixel area – inter pixel area
    • linearity
    • dynamic range
practical measurements errors
Practical measurements - Errors
  • Stray light
  • Wavelength error
  • Bandwidth - interpolation, extrapolation
  • Polarization
  • Detector system
  • Reference standard
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