PMMA Lens Design and Manufacturing for Indoor Uniform Illumination

DOI

10.2991/ame-16.2016.86How to use a DOI?

Keywords

PMMA lens, Illumination, Manufacturing, CNC

Abstract

Based on a new ray mapping method in (u, v) coordinate system, we have designed a polymethyl methacrylate(PMMA) lens for indoor uniform illumination. The lighting area is 18m ×18m and has a distance of 8m to the light source. We have calculated the surface curves and lofted them into surface, then the lens three-dimensional model is constructed, the PMMA lens is with a refractive index of 1.4935, the size of the lens is 38mm × 38mm × 18mm. Since the new ray mapping method applies error control to constructing the lens surface, the surface is discontinuous and consists of 20 surface patches. With the lens model being inserted into the optical simulation software, we can process the lighting simulation by a LED source with 1 million rays. Simulation results show the minimum illuminance on the lighting area is 2.2lux and the average illuminance is about 2.6lux. After constructing arrays with 9 designed lenses, the simulation results show the minimum illuminance on the lighting area is about 21lux, which meets the requirement of indoor illumination. In order to prove the lens model can apply to the indoor lighting situation, we have manufactured a lens with PMMA on precision CNC machine tool. With the manufactured lens, we complete the lighting experiment and obtain the lighting pattern. But we have found dark fringes exist on the lighting pattern and the illuminance around two vertexes are not expected results, that is because the compact discontinuous part of the lens can't be manufactured precisely on precision CNC machine tool, and this bring manufacturing errors to the lens.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Dian-Hong Liu
AU  - Xiao-Hui Zhang
AU  - Chen Chen
PY  - 2016/06
DA  - 2016/06
TI  - PMMA Lens Design and Manufacturing for Indoor Uniform Illumination
BT  - Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016)
PB  - Atlantis Press
SP  - 523
EP  - 526
SN  - 2352-5401
UR  - https://doi.org/10.2991/ame-16.2016.86
DO  - 10.2991/ame-16.2016.86
ID  - Liu2016/06
ER  -