一种表面激光散射特性数据三维测量方法

激光双向反射分布函数(BRDF)数据测量是一种获得目标表面信息的重要手段。利用几何光学理论建立了目标表面BRDF模型,采用激光器、激光能量密度测量设备、转台、漫反射板等光电实验室常用测量设备,在相同的几何和物理条件下,分别测量样品和散射特性已知的漫反射板对激光能量的散射特性数据,推算出样品的BRDF数值;保持测量平面静止,通过翻转被照射表面获取样品表面的三维BRDF数据,推算了翻转过程中测量点的角度换算关系;利用测量结果,进行了目标表面BRDF模型的参数优化,建立了样品表面BRDF模型;实验环境容易构建,操作简便,为研究目标表面激光散射特性提供了一种新的研究思路。

A 3D Measuring Technique of Laser Scattering Characteristic Data for Surface

Bidirectional reflectance distribution function (BRDF) data measurement is an important instrument to acquire information of target surface. The geometrical optics is used to establish theoretic model of laser BRDF. A model is designed to measure the scattering data with lasers, measuring equipments for laser energy density, etc. Under the same measurement condition, the sample and a diffuse reflection plate, whose scattering characteristic is known, are measured together to acquire scattering data of laser pulse. The 3D BRDF data is measured by turning the sample surface and keeping the measurement surface immobile. The 3D angles of measuring positions are computed. The model parameters are optimized using measurement data. The BRDF model of the sample is established. The measuring condition is easily constructed and it has a simple and convenient process. A new way is provided to research sample surface BRDF characteristic.