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Proceedings Paper

A beam splitter of natural light guiding system based on dichroic prism for ecological illumination
Author(s): Yu-Chi Li; Yi-Yung Chen; Allen Jong-Woei Whang
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Paper Abstract

In thremmatology, many researches focus on ecological illumination for improving the growing speed of animal or plant. According to the Trichromatic theory, any specific color can be made up of red, green, and blue light. Sunlight has full spectrum so it is the most applicable source. A Natural Light Guiding System includes collecting, transmitting, and lighting parts. In our research, we would like to design a beam splitter in the transmitting part to separate the sunlight into red, green, and blue light for ecological illumination. We use high pass and low pass dichroic coatings in a prism, called dichroic prism, to be the beam splitter to separate the wavelength. For measuring the spectra of the exit beams, we build a space with the Natural Light Guiding System. In the space, the spectra of sunlight outside and inside the space and the exit beams of the beam splitter are measured. Finally, we use prismatic structure to design the beam splitter, and optimize the surface of the element with aspheric surface and Fresnel surface to reduce the beam angle of exit light.

Paper Details

Date Published: 21 August 2009
PDF: 9 pages
Proc. SPIE 7429, Novel Optical Systems Design and Optimization XII, 742909 (21 August 2009); doi: 10.1117/12.825286
Show Author Affiliations
Yu-Chi Li, National Taiwan Univ. of Science and Technology (Taiwan)
Yi-Yung Chen, National Taiwan Univ. of Science and Technology (Taiwan)
Allen Jong-Woei Whang, National Taiwan Univ. of Science and Technology (Taiwan)

Published in SPIE Proceedings Vol. 7429:
Novel Optical Systems Design and Optimization XII
R. John Koshel; G. Groot Gregory, Editor(s)

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