Details

Autor(en) / Beteiligte

• Zhu, Zhengbo
• Ma, Donglin
• Hu, Qiaomu
• Tang, Yongqian
• Liang, Rongguang

Titel

Catadioptric freeform optical system design for LED off-axis road illumination applications

Ist Teil von

• Optics express, 2018-01, Vol.26 (2), p.A54-A65

Ort / Verlag

United States

Erscheinungsjahr

2018

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The aim of this paper is to develop a new composite structure of catadioptric optical system containing both freeform refractive surface and freeform total internal reflective (TIR) surface for LED road illumination applications. The role of freeform refractive part is to generate the shifted general rectangular illumination pattern to optimally match the shape of the road surface. The application of TIR mechanism is aimed to control the stray light in the sidewalk direction of the road luminaire and maximize the efficient energy efficiency. In this paper, we use the "double pole" ray mapping technique to design the refractive optical surface and the θ-φ coordinate ray mapping technique to derive the freeform TIR surface. The simulation shows that the novel catadioptric design has relatively high collection efficiency, thus high average illuminance level inside the effective illumination area. This lens also has good control of stray light on the backside of the road luminaire.