Acta Optica Sinica, Vol. 40, Issue 24, 2422001 (2020)
Design of Optical System with Illumination Uniform and High Distance-Height Ratio Based on Double Freeform-Surface
Zeng Yi, Zhao Huifu*, and Duan Wenju
- School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun, Jilin 130012, China
In order to solve the problems of thick lens thickness and uneven illumination in conventional irradiance illumination systems, a double freeform-surface lens with a distance to height ratio (DHR) of 3 is designed. According to the energy mapping theory, the light source and the target surface are meshed, the edge-ray theory and Snell's law are used to construct the double freeform-surface lens, and the actual light source is used for simulation. Compared with the single freeform-surface lens, the thickness of the double freeform-surface lens is reduced by 2.95% and the transverse size of the lens is reduced by 10.50%. The complementary feedback correction method is used to optimize the lens. The optimized single and double freeform-surface lens have 80.48% and 87.05% illumination uniformity, respectively, and the energy utilization rate is 88.61% and 91.23%, respectively. Compared with the single freeform-surface surface lighting system, the optical performance of the double freeform-surface lens is improved. For the lighting system with high DHR and small lens size, higher illuminance uniformity and energy utilization can be achieved.
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