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亮度评价方法在道路照明评价中变得越来越重要,但有关亮度的计算工作却十分缺乏。虽然用CIE(国际照明委员会)提供的路面反射表r(β,γ)可以计算道路的亮度分布,但其实际的计算过程却很困难。分析其困难的根本原因是在于道路亮度分布是基于直角坐标而CIE的反射表却基于球坐标。本文引入了一个新的基于直角坐标的路面反射表,称为r(x,y)表。用r(x,y)表分析路面反射特性将更直观、形象而且更具有系统性,计算直线道路亮度分布也更容易。文章给出了r(x,y)表的导入方法,详细分析了不同路面性质时在沿道路方向和垂直道路方向上的反射系数变化规律,以及用r(x,y)表方便地计算单个车道和整个道路的亮度分布的方法。这将大大有利于分析给定灯具时道路的亮度如何分布,以及如何设计等亮度分布的灯具。
The brightness evaluation method is becoming more and more important in the road lighting evaluation, but the calculation of the brightness is very scarce. Although the pavement reflection table r (β, γ) provided by the CIE (International Commission on Illumination) can calculate the brightness distribution of a road, its actual calculation is difficult. The fundamental reason for analyzing this difficulty is that the road luminance distribution is based on Cartesian coordinates and the CIE reflectometer is based on spherical coordinates. This paper introduces a new Cartesian coordinate reflection table called r (x, y). Using r (x, y) tables to analyze pavement reflectance characteristics will be more intuitive, visual and systematic, and it is easier to calculate the brightness distribution of straight-line roads. In this paper, the introduction of r (x, y) table is given. The variation of reflection coefficient along the direction of the road and the direction of the vertical road with different pavement properties is analyzed in detail. The r (x, y) Method for the brightness distribution of lanes and the entire road. This will greatly facilitate the analysis of how the road brightness is distributed for a given luminaire, and how to design luminaires with brightness distribution.