The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

Jian Fei Ouyang - One of the best experts on this subject based on the ideXlab platform.

  • Uniform illumination design by configuration of LED array and Diffuse Reflection surface for color vision application
    IEEE OSA Journal of Display Technology, 2011
    Co-Authors: Zhen Min Zhu, Guo Xin Jia, Xing Hua Qu, Jian Fei Ouyang
    Abstract:

    Illumination uniformity and color mixing results are essential for color vision applications. In this paper, an indirect method is proposed for the uniform illumination, and a mathematically simulated algorithm is developed. We integrate the method of light-emitting diode (LED) array and Diffuse Reflection surface for uniform illumination system. By considering each single LED as an imperfect Lambertian emitter, we discuss the irradiance distribution over a sphere's inner surface to the three-ring LED array. The sphere's inner surface is a Diffuse Reflection surface with high hemisphere reflectance. Using the bi-directional reflectance distribution functions (BRDF) of the sphere's inner surface, we simulate the uniformity of the LED illumination at varying distances. Finally, we design a practical LED illumination. The uniformity of practical LED illumination agrees with the simulated result. The results demonstrate the usefulness of this method for uniform illumination design.

Lu-sheng Zhong - One of the best experts on this subject based on the ideXlab platform.

  • Design of Diffuse Reflection Freeform Surface for Uniform Illumination
    Journal of Display Technology, 2014
    Co-Authors: Hui Yang, Lu-sheng Zhong
    Abstract:

    Indirect illumination with light-emitting diodes (LEDs) and Diffusers is widely applied in various fields that require uniform illumination. In this paper, a design of Diffuse Reflection freeform surface is proposed. Based on the Lambertian characteristic of LEDs and ideal Diffuse surface, a mathematical model is developed. Nonlinear algebraic equations are established by redistributing the energy emitted from LEDs to the illuminated scene for uniform illumination. Solving these equations numerically, the outline of the Diffuse surface is obtained. Finally, by using ray tracing software TracePro, the simulation result shows that the irradiance uniformity of the detection plane is above 95% with high accepted tolerance.

Hui Yang - One of the best experts on this subject based on the ideXlab platform.

  • Design of Diffuse Reflection Freeform Surface for Uniform Illumination
    Journal of Display Technology, 2014
    Co-Authors: Hui Yang, Lu-sheng Zhong
    Abstract:

    Indirect illumination with light-emitting diodes (LEDs) and Diffusers is widely applied in various fields that require uniform illumination. In this paper, a design of Diffuse Reflection freeform surface is proposed. Based on the Lambertian characteristic of LEDs and ideal Diffuse surface, a mathematical model is developed. Nonlinear algebraic equations are established by redistributing the energy emitted from LEDs to the illuminated scene for uniform illumination. Solving these equations numerically, the outline of the Diffuse surface is obtained. Finally, by using ray tracing software TracePro, the simulation result shows that the irradiance uniformity of the detection plane is above 95% with high accepted tolerance.

Zhen Min Zhu - One of the best experts on this subject based on the ideXlab platform.

  • Design method of double freeform surface lens with Diffuse Reflection
    Lighting Research & Technology, 2019
    Co-Authors: Zhen Min Zhu, Bo Peng, Jie Yuan
    Abstract:

    The design method of a double freeform surface lens is being widely applied in non-imaging optical systems. In this paper, a Diffuse Reflection freeform surface is introduced into the design of a d...

  • Uniform illumination design by configuration of LED array and Diffuse Reflection surface for color vision application
    IEEE OSA Journal of Display Technology, 2011
    Co-Authors: Zhen Min Zhu, Guo Xin Jia, Xing Hua Qu, Jian Fei Ouyang
    Abstract:

    Illumination uniformity and color mixing results are essential for color vision applications. In this paper, an indirect method is proposed for the uniform illumination, and a mathematically simulated algorithm is developed. We integrate the method of light-emitting diode (LED) array and Diffuse Reflection surface for uniform illumination system. By considering each single LED as an imperfect Lambertian emitter, we discuss the irradiance distribution over a sphere's inner surface to the three-ring LED array. The sphere's inner surface is a Diffuse Reflection surface with high hemisphere reflectance. Using the bi-directional reflectance distribution functions (BRDF) of the sphere's inner surface, we simulate the uniformity of the LED illumination at varying distances. Finally, we design a practical LED illumination. The uniformity of practical LED illumination agrees with the simulated result. The results demonstrate the usefulness of this method for uniform illumination design.

Guo Xin Jia - One of the best experts on this subject based on the ideXlab platform.

  • Uniform illumination design by configuration of LED array and Diffuse Reflection surface for color vision application
    IEEE OSA Journal of Display Technology, 2011
    Co-Authors: Zhen Min Zhu, Guo Xin Jia, Xing Hua Qu, Jian Fei Ouyang
    Abstract:

    Illumination uniformity and color mixing results are essential for color vision applications. In this paper, an indirect method is proposed for the uniform illumination, and a mathematically simulated algorithm is developed. We integrate the method of light-emitting diode (LED) array and Diffuse Reflection surface for uniform illumination system. By considering each single LED as an imperfect Lambertian emitter, we discuss the irradiance distribution over a sphere's inner surface to the three-ring LED array. The sphere's inner surface is a Diffuse Reflection surface with high hemisphere reflectance. Using the bi-directional reflectance distribution functions (BRDF) of the sphere's inner surface, we simulate the uniformity of the LED illumination at varying distances. Finally, we design a practical LED illumination. The uniformity of practical LED illumination agrees with the simulated result. The results demonstrate the usefulness of this method for uniform illumination design.