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Published byOliver Lewis Modified over 9 years ago
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Colorimetric practice zColour measuring instruments zLightsource colorimetry zLuminance and brightness description zMeasurement of materials: colour recipe, fluorescence, signal colours
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Instruments zTristimulus colorimeters zSpectroradiometers yscanning, band-width and sampling yCCD type, missed details zImage forming colorimeters
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Tristimulus colorimeter zLuminace and illuminance measuring
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Tristimulus filters zSandwich type filters zPartial filtering
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Goodness of fit evaluation zSpectral mismatch error description
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Spectral match of a full- filtered instrument F1x=2.6, F1y=2.2, f1z=3.8
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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
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Colour correction of a CCD colorimeter zF1x=7.5, f1y=3.6, f1z=3.9
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Spectroradiometry zOptics of the equipment zBandwidth zStray light zSingle and double monochromators zDetection yphotomultipliers yCCD arrays
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Spectroradiometry zSpectral irradiance measurement zSpectral radiance and flux measurement zThe spectroradiometer zMeasurement principles zPractical measurements
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The spectroradiometer system
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Input optical arrangement-1
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Input optical arrangement-2
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Monochromators - 1 zLight grasp or etendu, throughput, efficiency: zDouble monochromator: yTwo gratings (additive, subtractive dispersion) ygrating + prism
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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°
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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
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Method of measurement zSequence: test - standard zTransmittance function - Bandwidth
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Bandwidth & sampling
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Continuous scan method
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Grating monochromator zSecond order specrum, cutting by filters or a prisn pre- disperser
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CCD type detector systems zSingle grating ystray light ysecond order zDetector system yPixel area – inter pixel area ylinearity ydynamic range
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CCD arrey spectrometer
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Practical measurements - Errors zStray light zWavelength error zBandwidth - interpolation, extrapolation zPolarization zDetector system zReference standard
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