Topcon SR-LEDW User Manual

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SR-LEDW/SR-UL2/SR-UL1R/SR-3AR
Mathematical Formulas
The following formulas are applied by the SR-LEDW/SR-UL2/SR-UL1R/SR-3AR for each data.
Spectral radiance Le ()
 
 
 




samp
ref
ref
samp
D
D
L
)(L 
[ W / srm
2
nm ]
L
samp
(  ): Spectral radiance of the object [W/ srm
2
nm]
L
ref
(): Spectral radiance of the perfect reflecting diffuser under standard light A
100lux [W/ sr m
2
nm]
D
ref
(): Output of the photoelectric element when measuring the perfect reflecting
diffuser under standard light A 100lux
D
samp
(): Output of the photoelectric element when measuring the object.
Radiance Le
 





2
1
samp
LLe
1 : Measuring start wavelength 380 nm
2 : Measuring end wavelength 780 nm
:  =1
Tristimulus values X, Y, Z Luminance Lv
Observation visual field 2°
   





samp
2
1
L xKX
   





samp
2
1
v
L yKYL
   





samp
2
1
L zKZ
¯x (), ¯y (), ¯z () : Color matching functions in CIE 1931 standard colorimetric system
K : Parameter 683 lm/W
1 : Measuring start wavelength 380 nm
2 : Measuring end wavelength 780 nm
 :  = 1

Topcon SR-LEDW Specifications

General

Brand	Topcon
Model	SR-LEDW
Category	Measuring Instruments
Language	English