Freeform lens design for providing LED small angle illumination in underwater application

Xiaohui Zhang; Chen Chen

doi:10.1117/12.2191646

12 August 2015 Freeform lens design for providing LED small angle illumination in underwater application

Xiaohui Zhang, Chen Chen

Proceedings Volume 9624, 2015 International Conference on Optical Instruments and Technology: Micro/Nano Photonics and Fabrication; 96240C (2015) https://doi.org/10.1117/12.2191646
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

With high light efficiency and long aging life, LED solid-state light source has attracted much attention in underwater application, such as optical communication and imaging. But, the large divergence angle of LED illumination has been a big challenge in practical underwater application, such as the light attenuation in water and then the decreased signal-to-noise ratio. Source-target map is a vital method in illumination optics design, and the focus is to solve numerically differential equations and then construct the freeform surface. To achieve high accuracy freeform surface, an improved method is suggested and optimized through much more advanced and accuracy Runge-Kutta method, which is different from the original design one through Euler method. The designed lens is simulated by ray trace software TracePro, and the simulation results show that the uniformity of 0.8 and the efficacy of 0.6 is obtained. While as, the method is proven to be effective, and also the accuracy of the smooth freeform surface is strengthened. One designed illumination lens is fabricated by computer numeric control (CNC) machine to demonstrate the design experimentally.

Citation Download Citation

Xiaohui Zhang and Chen Chen "Freeform lens design for providing LED small angle illumination in underwater application", Proc. SPIE 9624, 2015 International Conference on Optical Instruments and Technology: Micro/Nano Photonics and Fabrication, 96240C (12 August 2015); https://doi.org/10.1117/12.2191646

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KEYWORDS

Lens design

Light emitting diodes

Detection and tracking algorithms

Optical design

LED lighting

Light

Differential equations

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