抛光花岗岩的二向反射比与偏振度的波谱关系  

Spectral Relationship between Bidirectional Reflectance and Degree of Polarization of Polished Granite

作　　者：相云[1,2] 晏磊[1] 赵云升[3] 陈伟[1] 

机构地区：[1]北京大学地球与空间科学学院空间信息集成与3S工程应用北京市重点实验室,北京100871 [2]河北省气象科学研究所,河北省生态环境监测实验室,河北石家庄050021 [3]东北师范大学城市与环境科学学院,吉林长春130024

出　　处：《地理与地理信息科学》2011年第1期25-28,F0002,共5页Geography and Geo-Information Science

基　　金：国家自然科学基金项目(40572167;60808035;60971086)

摘　　要：传统遥感定义"双向反射率分布函数"(BRDF)的概念,用以表达目标物空间反射的多角度分布特征,但其测量多偏重于单波长的微波及激光。偏振伴随多角度探测而生,蕴涵了目标物的自身特性。该文就城市常见地物——抛光的花岗岩,分别测量了其在350～2 500nm范围内的二向反射比和偏振度的波谱,分析并比较了两者波谱随探测角度的变化规律,并从定义上分析了两者的波谱关系,发现其随探测天顶角及方位角的变化规律一致,而且二向反射比和偏振度的波谱在一定程度上呈反比关系。The Bidirectional Reflectance Distribution Function（BRDF）is used in modern optical engineering to characterize the spectral and geometrical scatter of materials,which is measured popularly on a certain wavelength in microwave band or with laser.Polarization occurs when light is reflected and scattered by surface which contains object characteristics.Bidirectional reflectance and Degree of Polarization（DOP） of polished granite were measured in the reflective solar band between 350 nm and 2 500 nm at 50° incident over a range of scatter angles from about 0° to 50° zenith and from 180° to about 230° azimuth every 10°.It is shown that both bidirectional reflectance and DOP increases with the increase of zenith from 0° to 50° at the certain azimuth angle 180° and decreases when farther away from the specular reflection azimuth（180° azimuth angle） in the forward scatter region at the certain zenith angle 50°.Bidirectional reflectance and DOP are inverse shown in both spectra to some extent,i.e.peak on one spectrum corresponding to valley on the other.

关 键 词：花岗岩 二向反射比 偏振度 

分 类 号：TP70[自动化与计算机技术—检测技术与自动化装置]