A water-microorganism detecting device with freeform lens

Wu, Heng; Zhang, Xianmin; Zhao, Genping; Cheng, Lianglun; Yu, Jindong; Ge, Peng

doi:10.1016/j.optlastec.2018.06.054

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“…Phase space methods have already prooven to be promising for improved raytracing of illumination systems [15]. Within this paper, we will try to employ this approach for the design of illumination systems, in particular for a uniformity-corrector lens [16,17] used in combination with an elliptical reflector. The analysis of the local transformation in phase space allows us to find an appropriate design approach to optimize a thick freeform correction lens.…”

Section: Introductionmentioning

confidence: 99%

Design of a freeform uniformity corrector lens for extended sources in elliptical reflectors

Rausch¹,

Herkommer²

2019

J. Phys. Photonics

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Illumination design usually requires the collection of a large solid angle of radiation from the light source. However, it is known that elliptical reflectors in combination with extended uniform light sources result in a non-uniform irradiance profile at the secondary focus. Within this paper we propose a design method based on phase space transformations, which includes the source extension from the very beginning. We show that an analysis of the local mapping of the source to the target radiance distribution allows a profound understanding of the effects and in consequence a design concept for an additional freeform lens to correct the uniformity at the secondary focus.

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Section: Introductionmentioning

confidence: 99%