MEASUREMENT OF ANGULAR NONUNIFORMITY OF AN INTEGRATION SPHERE FOR TOTAL SPECTRAL RADIANT FLUX MEASUREMENT

摘要

In order to measure total spectral radiant flux value using integrating sphere, the spatial response distribution function (SRDF) of the sphere detector should be taken into account to correct the errors arising from the differences spatial distribution of radiant flux from light sources. We have constructed beam scanner systems and measured SRDF for 2π and 4π light source geometries. We could obtain SRDF profiles of 2π and 4π geometries. The results showed that nonuniformity of SRDF was extreme around detector ports that were placed behind the baffles, which was as much as 10 %. Non-uniformities of SRDF caused by the shadow of baffles were also observed. SRDF profile could be measured to evaluate and correct the errors arising from special distribution differences of the light sources.