colorimetric practice zcolour measuring instruments zlightsource colorimetry zluminance and...
TRANSCRIPT
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Colorimetric practice
Colour measuring instrumentsLightsource colorimetryLuminance and brightness descriptionMeasurement of materials: colour recipe,
fluorescence, signal colours
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Instruments
Tristimulus colorimeters
Spectroradiometers
scanning, band-width and sampling
CCD type, missed details
Image forming colorimeters
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Tristimulus colorimeter
Luminace and illuminance measuring
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Tristimulus filters
Sandwich type filtersPartial filtering
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Goodness of fit evaluation
Spectral mismatch error description
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Spectral match of a full-filtered instrument
0.0000
0.2000
0.4000
0.6000
0.8000
1.0000
1.2000
1.4000
1.6000
1.8000
400 450 500 550 600 650 700 750
wavelength, nm
rel.
resp
.
x(Si)
y(Si)
z(Si)
x(CIE)
y(CIE)
z(CIE)
F1x=2.6, F1y=2.2, f1z=3.8
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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
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Colour correction of a CCD colorimeter
F1x=7.5, f1y=3.6, f1z=3.9
0.0000
0.2000
0.4000
0.6000
0.8000
1.0000
1.2000
1.4000
1.6000
1.8000
400 450 500 550 600 650 700 750
wavelength, nm
rel.
resp
.
x(CCD)
y(CCD)
z(CCD)
x(CIE)
y(CIE)
z(CIE)
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Spectroradiometry
Optics of the equipmentBandwidthStray lightSingle and double monochromatorsDetection
photomultipliers CCD arrays
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SpectroradiometrySpectroradiometry
Spectral irradiance measurement
Spectral radiance and flux measurement
The spectroradiometerMeasurement principlesPractical measurements
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The spectroradiometer The spectroradiometer systemsystem
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Input optical arrangement-1Input optical arrangement-1
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Input optical arrangement-2Input optical arrangement-2
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Monochromators - 1
Light grasp or etendu, throughput, efficiency:
Double monochromator: Two gratings (additive, subtractive
dispersion) grating + prism
Zh A
f( )
( ).
d
d
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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°
s
( )
( )
R T
R2
11
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Detector and measuring Detector and measuring systemsystem
Irradiation of detector - homogeneityType of detector: photomultiplier, Si-
cell linearity (superposition) temperature dependence high voltage stability
Standard sourcesMethod of measurement
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Method of measurementMethod of measurement
Sequence: test - standardTransmittance function -
Bandwidth
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Bandwidth & samplingBandwidth & sampling
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Continuous scan methodContinuous scan method
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Grating monochromator
Second order specrum, cutting by filters or a prisn pre-disperser
k i l é p õ r é s
o p t i k a i r á c s
a n a l i z á t o r t ü k ö r
k o l l i m á t o r t ü k ö r
b e l é p õ r é s
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CCD type detector systems
Single grating stray light second order
Detector system Pixel area – inter pixel area linearity dynamic range
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CCD arrey spectrometerb e l é p õ r é s
C C D é r z é k e l õ
r á c s
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Practical measurements - Practical measurements - ErrorsErrors
Stray lightWavelength error Bandwidth - interpolation,
extrapolationPolarizationDetector systemReference standard