Colorimetric practice zColour measuring instruments zLightsource colorimetry zLuminance and brightness description zMeasurement of materials: colour recipe, fluorescence, signal colours
Instruments zTristimulus colorimeters zSpectroradiometers yscanning, band-width and sampling yCCD type, missed details zImage forming colorimeters
Tristimulus colorimeter zLuminace and illuminance measuring
Tristimulus filters zSandwich type filters zPartial filtering
Goodness of fit evaluation zSpectral mismatch error description
Spectral match of a full- filtered instrument F1x=2.6, F1y=2.2, f1z=3.8
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
Colour correction of a CCD colorimeter zF1x=7.5, f1y=3.6, f1z=3.9
Spectroradiometry zOptics of the equipment zBandwidth zStray light zSingle and double monochromators zDetection yphotomultipliers yCCD arrays
Spectroradiometry zSpectral irradiance measurement zSpectral radiance and flux measurement zThe spectroradiometer zMeasurement principles zPractical measurements
The spectroradiometer system
Input optical arrangement-1
Input optical arrangement-2
Monochromators - 1 zLight grasp or etendu, throughput, efficiency: zDouble monochromator: yTwo gratings (additive, subtractive dispersion) ygrating + prism
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°
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
Method of measurement zSequence: test - standard zTransmittance function - Bandwidth
Bandwidth & sampling
Continuous scan method
Grating monochromator zSecond order specrum, cutting by filters or a prisn pre- disperser
CCD type detector systems zSingle grating ystray light ysecond order zDetector system yPixel area – inter pixel area ylinearity ydynamic range
CCD arrey spectrometer
Practical measurements - Errors zStray light zWavelength error zBandwidth - interpolation, extrapolation zPolarization zDetector system zReference standard