公路隧道照明察觉对比设计方法中的大气透射比τatm取值研究

摘要

As an important parameter in the perceived contrast method of tunnel lighting,the near-surface at⁃mospheric transmittance of one stopping sight distance,τatm(0.1) is taken as an object of study in this paper. In order to determine the reasonable values ofτatm(0.1) under different weather conditions,at first,several ca⁃culati- on methods ofτatm are analyzed and compared,and the calculation method of atmospheric visual theory is determined to be the most suitable method for this study. Then, the experimental research of τatm , taking Chongqing region as an example,is conducted in six typical weather conditions. Eventually,according to the experimental results,the paper compares the calculated values of τatm(0.1) with the recommended value of CIE.%文章以公路隧道照明察觉对比设计方法中的一项重要参数———一个停车视距的近地面大气透射比τatm（ R）为研究对象，为确定其在不同天气条件下的合理取值，研究首先通过分析与比较几种关于大气透射比τatm计算方法，确定大气视觉计算法为最适合的方法。而后，以重庆地区为例，在六种具有代表性的天气条件下完成了大气透射比τatm的实际测定。最终，根据实验结果对τatm（0．1）计算值与CIE推荐值进行了比较与分析。