Led Freeform Surface Design And Application Research

With the upgrading of LED chip manufacturing technology and cost reduction,the scope of LED lighting and applications has expanded.In LED lighting,the use of free-form lenses to control and optimize lighting effects is a hot research direction.With the maturity of lens design theory,in order to complete the design more efficiently and accurately,this paper combines the optimization of lens shape with artificial intelligence algorithms to design free-form lenses suitable for point light sources and extended light sources.For the problem of uniformity of lighting,this paper combines the simulated annealing algorithm to solve the optimal module parameters to complete the optimal design of the system.Finally,by combining fiber optic lighting technology and LED lens design theory,a model of fiber optic lighting lamp is designed,and the influence of installation errors on the parameters of lighting light is experimentally explored.The content of this thesis is as follows:In order to realize the circular spot lighting of the point light source system and explore the influence of morphological parameters on the lighting effect,the emission model of the light flux of the light source was derived.According to Snell’s law,the coordinate points of the free-form lens generatrix in the meridional plane were calculated and programmed by matlab.The system simulation of the illumination uniformity is 91.53% and the light transmission efficiency is 92.22%.And the influence of the morphological parameters of the lens on the lighting effect is analyzed.Aiming at the problem of uniform illumination of the extended light source,based on the lens suitable for point light sources,the basic particle swarm optimization algorithm is applied,and the new coordinates of the lens are calculated and simulated by I / O functions of matlab and tracepro-scheme,and the illumination is feedback Uniformity and optical transmission efficiency,enabling dynamic data exchange between client and server.After several iterative optimizations,the free-form lens coordinate points suitable for the extended light source were obtained.The system’s simulated illumination uniformity was 91.76% and the light transmission efficiency was 92.07%,which provided a feasible solution for the extended light source to achieve uniform spot design.In the uniform design for the rectangular light spot,a mesh division iterative method is adopted to design and obtain a lens with a small power LED light source to realize a rectangular light spot.The LED light source and the lens are combined into a light source module.The simulated annealing algorithm is used to calculate and analyze the system’s optimal parameter problem during the arraying process.The problem of light spot degradation was solved caused by the arraying of multiple light source modules.Finally,in order to apply the fiber-optic bundle end light emission to a uniform lighting scene,a fiber-optic end light based on fiber-optic lighting technology was designed and a model-like light was produced.A coupling device for the LED light source and the optical fiber bundle was designed based on the light guiding characteristics of the optical fiber.The best fitting order was 10 through tolerance analysis,and a light distribution lens for the end of the optical fiber bundle was designed by combining the grid division method.The simulation shows that the uniformity of the vertical illumination of the light spot is 90.99%,the uniformity of the horizontal illumination is 89.59%,and the coupling efficiency of the coupling device is 87%.Finally,the experimental error analysis shows that the optimal coupling distance of the system is 2mm,the lens height is 50 mm,and the actual spot illumination uniformity of the lamp is 81.54%,which provides an application scheme for LED lighting.