Semi-automatic laboratory goniospectrometer system for performing multi-angular reflectance and polarization measurements for natural surfaces.
Semi-automatic laboratory goniospectrometer system for performing multi-angular reflectance and polarization measurements for natural surfaces.
复制标题
DOI：
10.1063/1.4862814
复制
发表时间：
2014-01
期刊：
影响因子：
--
通讯作者：
Zhongqiu Sun;Z. F. Wu;Y. Zhao
中科院分区：
文献类型：
--
作者：
Zhongqiu Sun;Z. F. Wu;Y. Zhao
本文描述了东北师范大学实验室测角光谱仪系统的设计和操作，该系统用于在受控照明条件下进行多角度反射和偏振测量。一个安装在旋转圆环上的半自动臂能够采集整个半球上大量的表面双向反射率因子（BRF）测量值。此外，一组偏振光学器件能够在350纳米至2300纳米的光谱范围内实现线性偏振。由于实验室中测量条件稳定，根据样品特性的不同，BRF和线性偏振的平均不确定度分别为1%和小于5%。通过测量一个Spectralon平面确定，该仪器的偏振精度以线性偏振度的绝对值形式低于0.01。本文还展示了2010 - 2013年期间测量的雪、土壤、沙子和冰的反射率和偏振情况，以说明其稳定性和准确性。这些测量结果有助于理解地球自然表面的散射特性。
In this paper, the design and operation of the Northeast Normal University Laboratory Goniospectrometer System for performing multi-angular reflected and polarized measurements under controlled illumination conditions is described. A semi-automatic arm, which is carried on a rotated circular ring, enables the acquisition of a large number of measurements of surface Bidirectional Reflectance Factor (BRF) over the full hemisphere. In addition, a set of polarizing optics enables the linear polarization over the spectrum from 350 nm to 2300 nm. Because of the stable measurement condition in the laboratory, the BRF and linear polarization has an average uncertainty of 1% and less than 5% depending on the sample property, respectively. The polarimetric accuracy of the instrument is below 0.01 in the form of the absolute value of degree of linear polarization, which is established by measuring a Spectralon plane. This paper also presents the reflectance and polarization of snow, soil, sand, and ice measured during 2010-2013 in order to illustrate its stability and accuracy. These measurement results are useful to understand the scattering property of natural surfaces on Earth.