LED自由曲面透镜的设计及应用研究

发布时间：2018-01-07 15:30

本文关键词：LED自由曲面透镜的设计及应用研究　出处：《深圳大学》2017年硕士论文　论文类型：学位论文

【摘要】：LED作为新型的绿色照明光源,被广泛应用于照明产业中。然而,由于LED光源的光强类似朗伯分布,不能直接应用于照明中,需对其进行二次光学设计。其中二次光学器件大多采用透镜或反射器,而前者形成特定光斑的优势明显比后者好,故对LED自由曲面透镜的研究极具意义。本文的主要工作体现在以下两个方面:(1)采用非成像光学理论知识推导了圆形和环形光斑透镜的自由曲面与LED光源及接收面之间的映射关系。首先推导出自由曲面方程组,通过解方程得到离散点坐标,然后依次建立圆形和环形光斑透镜的三维模型,并分别对其进行光学仿真模拟。当光源尺寸为1mm×1mm时,得到圆形和环形光斑的照度均匀性分别为95.7%和93.7%,光能效率分别为92.3%和91.1%。随着光源尺寸的增大,圆形和环形光斑的照度均匀性均逐渐降低,而光能效率基本维持不变,当光源尺寸增大到5mm×5mm时,圆形和环形光斑的照度均匀性都高于86%,光能效率在90%以上。但当光源尺寸增大到10mm×10mm时,圆形光斑的照度均匀性不足60%,采用光学分析软件中的2D交互式优化法对其进行优化,优化后的照度均匀性提高到85%。将环形光斑透镜排列成阵列模式,通过简单的热分析验证灯具的可行性,并用DIALux软件进行场景模拟,将其应用到道路照明案列中。(2)提出了一种细化网格密度的自由曲面求解算法,并将其应用于矩形光斑透镜的自由曲面。首先采用划分网格法进行矩形光斑透镜设计原理的推导,接着根据折射定律和能量守恒定律推导出自由曲面方程组,然后通过解方程得到自由曲面的离散点坐标,并建立矩形光斑透镜模型。通过仿真模拟得到均匀性效果很好的矩形光斑,当光源尺寸为1mm×1mm时,矩形光斑的照度均匀性为91.2%,光能效率为91.1%。随着光源尺寸的增大,矩形光斑的照度均匀性逐渐降低,而光能效率基本维持不变,当光源尺寸增大到5mm×5mm时,照度均匀性为82.3%,光能利用率为90.7%。但当光源尺寸增大到10mm×10mm时,矩形光斑的照度均匀性不足60%,采用反馈优化原理对其进行优化,优化后的照度均匀性提高到80%。最后使用DIALux软件进行场景模拟,将矩形光斑透镜应用到道路照明案列中。
[Abstract]:As a new type of green lighting source, LED is widely used in lighting industry. However, because the intensity of LED light source is similar to Lambert distribution, it can not be directly used in lighting. It is necessary to carry out the secondary optical design, in which the secondary optical devices mostly use lens or reflector, and the former has a better advantage than the latter in forming a specific spot. Therefore, it is of great significance for the study of LED free-form curved lens. The main work of this paper is reflected in the following two aspects: 1). The mapping relationship between the free surface of circular and annular speckle lens, the LED light source and the receiving surface is derived by using the theory of non-imaging optics. First, the equations of the free surface are derived. The coordinates of discrete points are obtained by solving the equation, and then the three-dimensional models of circular and annular speckle lenses are established in turn, and the optical simulation is carried out, respectively, when the light source size is 1mm 脳 1mm. The results show that the illumination uniformity of circular and annular spot is 95.7% and 93.7, respectively, and the light energy efficiency is 92.3% and 91.1, respectively. The light source size increases with the increase of light source size. The illumination uniformity of circular and annular light spots decreased gradually, but the light energy efficiency remained unchanged. When the light source size increased to 5 mm 脳 5 mm, the illumination uniformity of circular and circular spot was higher than 86%. The light energy efficiency is more than 90%, but when the light source size increases to 10 mm 脳 10 mm, the illumination uniformity of circular spot is less than 60%. The 2D interactive optimization method in the optical analysis software is used to optimize it, and the illumination uniformity is improved to 85. The annular speckle lens is arranged in array mode. The feasibility of lamps and lanterns is verified by simple thermal analysis, and the scene simulation is carried out with DIALux software. A free-form surface algorithm for mesh refinement is proposed by applying it to the road lighting case list. It is applied to the free surface of rectangular speckle lens. Firstly, the design principle of rectangular speckle lens is deduced by dividing mesh method, and then the equations of free surface are derived according to the law of refraction and the law of conservation of energy. Then the discrete point coordinates of the free-form surface are obtained by solving the equation, and the rectangular spot lens model is established. The rectangular spot with good uniformity is obtained by simulation, when the light source size is 1mm 脳 1mm. The illumination uniformity of the rectangular spot is 91.2 and the light energy efficiency is 91.1. With the increase of the light source size, the illumination uniformity of the rectangular spot decreases gradually, while the light energy efficiency basically remains unchanged. When the light source size increases to 5 mm 脳 5 mm, the illuminance uniformity is 82.3, the light energy utilization ratio is 90.7, but when the light source size increases to 10 mm 脳 10 mm. The illumination uniformity of rectangular spot is less than 60%, the feedback optimization principle is used to optimize it, the illumination uniformity is improved to 80%. Finally, DIALux software is used to simulate the scene. The rectangular speckle lens is applied to the road lighting case list.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM923.34

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