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Colorimetric practice zColour measuring instruments zLightsource colorimetry zLuminance and brightness description zMeasurement of materials: colour recipe,

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Presentation on theme: "Colorimetric practice zColour measuring instruments zLightsource colorimetry zLuminance and brightness description zMeasurement of materials: colour recipe,"— Presentation transcript:

1 Colorimetric practice zColour measuring instruments zLightsource colorimetry zLuminance and brightness description zMeasurement of materials: colour recipe, fluorescence, signal colours

2 Instruments zTristimulus colorimeters zSpectroradiometers yscanning, band-width and sampling yCCD type, missed details zImage forming colorimeters

3 Tristimulus colorimeter zLuminace and illuminance measuring

4 Tristimulus filters zSandwich type filters zPartial filtering

5 Goodness of fit evaluation zSpectral mismatch error description

6 Spectral match of a full- filtered instrument F1x=2.6, F1y=2.2, f1z=3.8

7 Angular responsivity zIlluminace type: ycosine corrected zLuminance type: ynarrow beam measurement: y0.5 ° … 2°opening angle zImage forming colorimeter yproblem with contrast, induction and assimilation

8 Colour correction of a CCD colorimeter zF1x=7.5, f1y=3.6, f1z=3.9

9 Spectroradiometry zOptics of the equipment zBandwidth zStray light zSingle and double monochromators zDetection yphotomultipliers yCCD arrays

10 Spectroradiometry zSpectral irradiance measurement zSpectral radiance and flux measurement zThe spectroradiometer zMeasurement principles zPractical measurements

11 The spectroradiometer system

12 Input optical arrangement-1

13 Input optical arrangement-2

14 Monochromators - 1 zLight grasp or etendu, throughput, efficiency: zDouble monochromator: yTwo gratings (additive, subtractive dispersion) ygrating + prism

15 Monochromators - 2 zStray radiation Determination with yInterference filter: ySharp cut-off filters yLasers zWavelength accuracy: +/- 0,1 nm ystability ytemperature dependence: 0,1 - 0,5 nm/C°

16 Detector and measuring system zIrradiation of detector - homogeneity zType of detector: photomultiplier, Si-cell ylinearity (superposition) ytemperature dependence yhigh voltage stability zStandard sources zMethod of measurement

17 Method of measurement zSequence: test - standard zTransmittance function - Bandwidth

18 Bandwidth & sampling

19 Continuous scan method

20 Grating monochromator zSecond order specrum, cutting by filters or a prisn pre- disperser

21 CCD type detector systems zSingle grating ystray light ysecond order zDetector system yPixel area – inter pixel area ylinearity ydynamic range

22 CCD arrey spectrometer

23 Practical measurements - Errors zStray light zWavelength error zBandwidth - interpolation, extrapolation zPolarization zDetector system zReference standard


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