Colorimetric practice
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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

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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


Spectral match of a full filtered instrument

Spectral match of a full-filtered instrument

F1x=2.6, F1y=2.2, f1z=3.8


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


Colour correction of a ccd colorimeter

Colour correction of a CCD colorimeter

  • F1x=7.5, f1y=3.6, f1z=3.9


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


The spectroradiometer system

The spectroradiometer system


Input optical arrangement 1

Input optical arrangement-1


Input optical arrangement 2

Input optical arrangement-2


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


Bandwidth sampling

Bandwidth & sampling


Continuous scan method

Continuous scan method


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


Ccd arrey spectrometer

CCD arrey spectrometer


Practical measurements errors

Practical measurements - Errors

  • Stray light

  • Wavelength error

  • Bandwidth - interpolation, extrapolation

  • Polarization

  • Detector system

  • Reference standard


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