Development of an Illuminated Delineator using in Laser Beams

划定范围有助于引导司机沿道路行驶，特别是在夜间或恶劣天气条件下。在浓雾中，足够的能见度对于为驾驶员提供道路几何提示非常重要。本文提出了一种新的利用激光的照明描绘器。关于激光在雾中的能见度，发表的数据很少。然而，由于激光的高强度、高能量和单斜性和强方向性，预计在浓雾中可以高度可见。本研究是为了评估激光在雾中的能见度。这项实验是在日本筑波的公共工程研究所交通标志实验室进行的。该实验室配备了一个能够产生人造雾的观察室。观察室的尺寸为：长30米；宽10米；高10米。研究了两种类型的激光头和一个包含两个10W辉光灯的照明描述器的有效性。因变量是激光上特定点的亮度和估计的亮度。主要自变量是观测室内的雾密度和照度。在浓雾中观察到的激光束是一条条尖锐的光线。正如普里查德和布莱克威尔[3]所指出的，激光光束在雾中的能见度与正常光的能见度成反比。此外，受试者报告说，激光的方向性可以有效地指示高速公路的方向。然而，观察室中的照度强烈影响了激光光束的能见度，必须小心，以免司机直接看多余的激光光束[7]。根据本研究的结果，我们得出结论，如果这一安全问题能够克服，激光在浓雾中可能是有用的照明光源。

Delineation helps to guide drivers along roadways, particularly at night or in adverse weather conditions. In dense fog, adequate visibility of the delineator is important for providing the driver with road geometry cues. The present paper proposes a new illuminated delineator that employs laser beams. Very little data has been published with regard to the visibility of laser beams in fog. However, laser beams can be expected to be highly visible in dense fog due to their high intensity, high energy, and directivity that is both monoclinic and strong. The present study was conducted in order to evaluate the visibility of laser beams in fog. The experiment was conducted in the Traffic Sign Laboratory, Public Works Research Institute, in Tsukuba, Japan. The laboratory is equipped with an observation room capable of generating artificial fog. The dimensions of the observation room are : length, 30m ; width, 10m ; and height, 10m. The effectiveness of two types of laser heads and an illuminated delineator containing two 10 W glow lamps was investigated. The dependent variables were luminance at a specific point on the laser beam and estimated brightness. The major independent variables were fog density and illuminance in the observation room. The laser beams were observed as sharp lines of light in dense fog. The visibility of the laser beams in fog had an inverse relationship to that of normal light, as indicated by Prichard and Blackwell [3]. In addition, subjects reported that the directivity of the laser beams could effectively indicate the direction of the highway. However, the visibility of the laser beams was strongly affected by the illuminance in the observation room, and care must be taken in order to prevent drivers from looking directly at redundant laser beams [7]. Based on the results of the present study, we conclude that laser beams may be useful lighting sources in dense fog if this safety problem can be overcome.