Colorimetric practice Colour measuring instruments Lightsource colorimetry Luminance and brightness description Measurement of materials: colour recipe, fluorescence, signal colours
Jan 02, 2016
Colorimetric practice
Colour measuring instrumentsLightsource colorimetryLuminance and brightness descriptionMeasurement of materials: colour recipe,
fluorescence, signal colours
Instruments
Tristimulus colorimeters
Spectroradiometers
scanning, band-width and sampling
CCD type, missed details
Image forming colorimeters
Tristimulus colorimeter
Luminace and illuminance measuring
Tristimulus filters
Sandwich type filtersPartial filtering
Goodness of fit evaluation
Spectral mismatch error description
fs t
t
i
i
10
0
100'*
%
() ()d
()d
rel
rel
0
relm
0
m
rel )(
d)()(
d)()(
)(*
s
sS
tS
si
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
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
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)
Spectroradiometry
Optics of the equipmentBandwidthStray lightSingle and double monochromatorsDetection
photomultipliers CCD arrays
SpectroradiometrySpectroradiometry
Spectral irradiance measurement
Spectral radiance and flux measurement
The spectroradiometerMeasurement principlesPractical measurements
The spectroradiometer The spectroradiometer systemsystem
Input optical arrangement-1Input optical arrangement-1
Input optical arrangement-2Input optical arrangement-2
Monochromators - 1
Light grasp or etendu, throughput, efficiency:
Double monochromator: Two gratings (additive, subtractive
dispersion) grating + prism
Zh A
f( )
( ).
d
d
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
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
Method of measurementMethod of measurement
Sequence: test - standardTransmittance function -
Bandwidth
Bandwidth & samplingBandwidth & sampling
Continuous scan methodContinuous scan method
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
CCD type detector systems
Single grating stray light second order
Detector system Pixel area – inter pixel area linearity dynamic range
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
Practical measurements - Practical measurements - ErrorsErrors
Stray lightWavelength error Bandwidth - interpolation,
extrapolationPolarizationDetector systemReference standard