Light-Receiving Element (Sensor) - Konica Minolta CHROMA METER Instruction Manual

Light-Receiving Element (Sensor)

The CS-150/160 is a high-accuracy tristimulus luminance color meter using three sensor
outputs (XYZ = Red, green and blue) of the spectral responsivity corresponding to human
eye sensitivity (CIE1931 color matching function).
It uses this spectral responsivity to measure an object, calculates the obtained tristimulus
values (X, Y and Z) to convert them into L
excitation purity, and display the result as a measured value.
The chromaticity coordinates (x, y) using L
the following equations:
X
x = , y =
X + Y + Z
z y
1.0
0.5
0.0
380 430 480 530
Wavelength (nm)
CIE1931 color matching function
and spectral response of CS-150/160
The LS-150/160 is a high-accuracy luminance meter using a sensor output of the standard
spectral luminous efficiency corresponding to human eye sensitivity.
JIS C 1609-1:2006 specifies the evaluation of the spectral responsivity of a luminance
meter as follows based on the deviation "f
V (λ) when the instrument is calibrated with a standard light source with spectral
distribution of 2856K black body radiation.
Classification General Precision Class
'
f
1
The relative spectral responsivity of the LS-150/160 is equivalent to General Class AA (JIS
C 1609-1:2006) and conforms to Class B of DIN 5032-7. The value f
following equation:
The value S'(λ)
is expressed by the following equation:
rel
x y, L
v
x y (CIE 1931 color space) can be obtained by
V
Y
where X, Y and Z are tristimulus values.
X + Y + Z
CIE1931 color
x
matching
function
Relative spectral
responsivity of
CS-150/160
580 630 680 730 780
'" from the standard spectral luminous efficiency
1
3
P(λ) : Relative spectral distribution of standard illuminant A
A
S(λ) : Relative spectral responsivity of the illuminance meter
rel
V(λ): Standard spectral luminous efficiency
dλ: Measurement wavelength interval (10 nm)
λ
: Lower limit of visible wavelength range
1
λ
: Upper limit of visible wavelength range
2
98
uʼvʼ, L
T duv, dominant wavelength, and
v v cp
1.0
0.5
0.0
380 430 480 530 580
Wavelength (nm)
Standard spectral luminous efficiency
and spectral response of LS-150/160
General Class AA
6
' is obtained by the
1
Standard
spectral
luminous
efficiency
Relative spectral
responsivity of
LS-150/160
630 680 730 780
General Class A
9