%0 Journal Article
%T Realization of luminous flux unit lumen at National Metrology Institute of Turkey (UME)
%A Farhad Samedov
%A Murat Durak
%J Optica Applicata
%D 2004
%I 
%X Luminous flux calibration facility with an integrating sphere has been installed at the National Metrology Institute of Turkey (UME) in order to realize lumen. A LabView-based computer-controlled electrical system has been developed to operate light sources and to control electrical parameters. Owing to the corrections of the sphere system, inner coating reflectance, spatial non-uniformity, self-absorption factor and interior temperature variations have been characterized. The overall uncertainty in luminous flux measurement has been determined with an uncertainty of 1.14% (k = 2) in the range between 5¨C5000 lm.
%K luminous flux
%K lumen
%K integrating sphere
%K illuminance
%K characterization
%K uncertainty
%U http://www.if.pwr.wroc.pl/~optappl/pdf/2004/no2/optappl_3402p265.pdf