The use of LEDs is increasing rapidly in both the commercial and residential markets. Nowadays, the main way to measure the luminous intensity distribution of a LED is by using a goniophotometer. This takes a long time which means its test efficiency is low. In this paper, we will propose a new way to measure the luminous intensity distribution of LEDs based on the Luneburg lens, which is a kind of dielectric lens with continuously changed index of refraction, with high efficiency and low cost. We also develop a complete test system and give the result of a simulation of the test system.
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References
1.
LuneburgR. Mathematical Theory of Optics, Cambridge, UK: University of Cambridge Press, 1965.
2.
Takahashi S, Chang C, Yang SY, Barbastathis G. Design and fabrication of dielectric nanostructured Luneburg lens in optical frequencies: Proceedings of the International Conference on Optical MEMS and Nanophotonics. Sapporo, Japan, Aug 9–12: 2010: 177–178.
3.
SmithDRMockJJStarrAFSchurigD. Gradient index metamaterials. Physical Review E2005; 71: 036609–036614.
4.
Braga-NetoUGoutsiasJ. Grayscale level connectivity: theory and applications. IEEE Signal Processing Society2004; 13: 1567–1580.
5.
SchrankHE. Graphical construction of rays in an ideal Luneburg lens. Journal of the IEEE Antennas Propagation1961; 9: 410–411.
