Multi-surface catadioptric freeform lens design for ultra-efficient off-axis road illumination

Abstract

We propose a novel design methodology to tackle the multi-surface catadioptric freeform lens design for off-axis road illumination applications based on an ideal source. The lens configuration contains an analytic refractive entrance surface, an analytic total internal reflective (TIR) surface and two freeform exit surfaces. A curl-free energy equipartition is established between the source and target plane and divided to implement the composite ray mapping mechanism. Furthermore, the analytic TIR surface and refractive entrance surface are optimized for the minimal Fresnel losses and surface error based on genetic algorithm (GA). The results show a significant improvement on illuminance uniformity and ultra-high transfer efficiency compared to our proposed result in [Zhu et al., Opt. Exp. 26, A54-A65 (2018)].

M1 ve M2 aydınlatma sınıfı yollar için geliştirilen bir COB LED’li yol aydınlatma armatür modelinin optik tasarımı

“…LED'li aydınlatma araçlarının optik tasarımında power LED'ler yerine her geçen gün artan ışık verimi, mekanik tasarım basitliği ve maliyet avantajı açısından COB LED esaslı armatürler ön plana çıkmaktadır [30]. Literatürde power LED'li yol aydınlatma armatürlerine ilişkin lens tasarımı ve analizine yönelik oldukça fazla çalışma bulunmaktadır [33][34][35][36]. Ancak COB LED'li yol aydınlatma armatürlerinin optik tasarımına yönelik çalışmaların ise literatürde son yıllarda yer almaya başladığı görülmektedir [37][38][39].…”

Measurement of Small-Slope Free-Form Optical Surfaces with the Modified Phase Retrieval

“…Using free-form surfaces, the imaging quality of the optical imaging system can be greatly improved; the illumination uniformity of the optical illumination system can be evidently improved; and the transmission efficiency of the information transmission system can also be remarkably improved. With the recent advances in optical design and fabrication, the free-form optical surface is commonly used because of its better performance and compactness [1][2][3].…”

Fresnel reflections in inverse freeform lens design

“…As mentioned, most inverse methods for freeform optical design do not take into account Fresnel reflections. There are some methods that aim to minimize the total loss due to Fresnel effects [10][11][12]. However, the authors only try to minimize the reflectance, and do not take into account the effect of the Fresnel reflections on the outgoing intensity or irradiance.…”