INVESTIGATION OF LED-BASED COMPACT TRANSFER STANDARD SOURCE FOR LUMINANCE MEASUREMENT

摘要

Recently, products of light emitting diodes (LEDs) are expanding in many areas, such as lighting and display technology. As well as luminous flux measurement in the lighting technology, luminance measurement is also important in the display technology. In this study, two types of transfer standard source for LED luminance measurement, which based on a high-power LED and a homogeneous optic, was constructed according to the result of ray tracing simulation. Several evaluations were tested on those trial models, and the characteristics was tried to improve by the evaluation results. In the improved model, the luminance difference was evaluated as ± 2.3 % within 8 mm in diameter or ± 3.2 % within 10 mm in diameter. The luminance uniformity as a practically usable luminance source was achieved.