覆水情况下沥青路面对905 nm激光的散射特性  

Scattering Characteristics of 905 nm Laser on Asphalt Pavement under Water Coverage

作　　者：杨韬 严伟[1,2] 张慧敏 吴志祥[1,2] 纪运景 赵艳[1,2] 来建成 王春勇[1,2] 李振华 YANG Tao;YAN Wei;ZHANG Huimin;WU Zhixiang;JI Yunjing;ZHAO Yan;LAI Jiancheng;WANG Chunyong;LI Zhenhua(School of Physics,Nanjing University of Science and Technology,Nanjing 210094,China;Jiangsu Semiconductor Device Optoelectronic Hybrid Integration Engineering Research Center,Nanjing 210094,China)

机构地区：[1]南京理工大学物理学院,南京210094 [2]江苏省半导体器件光电混合集成工程研究中心,南京210094

出　　处：《光子学报》2024年第12期229-242,共14页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61971225,62221004,62175110);江苏省卓越博士后计划(No.2024ZB370)。

摘　　要：以常见的覆水沥青路面为研究对象,利用几何光学光线追踪方法构建了覆水情形下沥青路面激光散射模型,实验验证了该模型的准确性。在此基础上,数值计算分析了不同入射角度下,路面粗糙度、入射光偏振态以及覆水深度等因素对散射光强的影响规律。结果表明,散射光强分布曲线随着表面粗糙程度的增大逐渐趋向于余弦分布,并且当均方根斜率大于0.5时,开始出现后向散射增强趋势。沥青路面在覆水前后的散射特性存在明显差异。覆水后散射光强分布宽度变大、p光布儒斯特角消失,且s、p光峰值差减小。此外,覆水使得路面散射强度在入射光镜面方向产生尖锐高峰,除尖锐高峰之外的光强峰值与覆水前散射强度峰值相比明显降低,约为原峰值的五分之一,且差值随着入射角增大而增大。该研究可为路面状态感知手段以及车载光学传感器的优化提供理论和实验数据支持。With the continuous development and advancement of intelligent transportation systems,autonomous driving and assisted driving technologies are increasingly maturing.Lidar has emerged as one of the key sensor components in this domain.Lidar is an optical sensor that detects target information from scattered light,where the scattering characteristics of the target significantly influence its detection performance.In the realm of smart driving,vehicles can extract surface features of the pavement from the scattering characteristics of the environment,thus enabling the detection and analysis of road conditions.A critical aspect of studying pavement scattering characteristics involves developing an accurate and efficient computational model for the scattering process.Early research by foreign scholars has yielded a series of classic methods for rough surface scattering processes.More recently,some domestic scholars have introduced partial scattering models to enhance the calculations of pavement scattering characteristics.However,traditional computational methods are typically applicable to radar bands in remote sensing scenarios and come with stringent application conditions.Some numerical methods struggle with computational efficiency and accuracy when handling large-scale targets.To address these challenges,this paper introduces a geometric optics ray tracing method that integrates analytical approximations with numerical methods to model the laser scattering characteristics of water-covered pavements.This hybrid approach allows for the precise simulation of laser scattering characteristics before and after the pavement is covered with water,which can be utilized for feature extraction and road type perception.This innovative method not only enhances the modeling accuracy of laser scattering characteristics but also improves computational efficiency,making it adaptable to various application scenarios.Specifically,this paper investigates the scattering characteristics of asphalt pavement at a 905 nm wavelength when

关 键 词：激光散射 沥青路面 覆水状态 几何光学近似 随机粗糙面 

分 类 号：O436[机械工程—光学工程]