2012•Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIERequires access
Secondary optical design for safety light curtains
Yu‐Hsiang Hsu, Yi‐Yung Chen, Allen Jong-Woei Whang
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Abstract
LED has many advantages that will replace traditional light sources. In this article, we design a convergence lens and use a LED light source with ± 30° half-power angle. The lens can convergence light source and make it become parallel light. The goal to achieve high directivity can be applied to wireless sensors. According to the simulation results, compared to the LED with dome lens that has ± 0.6° half-power angle, the LED use our design's lens has ± 0.34° half-power angle. In the same transmission distance, the LED with our design's lens has more than 200 times received energy.