Meier S R
Optical Sciences Division, Code 5622, Naval Research Laboratory, Washington, DC 20375, USA.
Appl Opt. 2001 Jun 1;40(16):2788-95. doi: 10.1364/ao.40.002788.
Angular and polarimetric directional hemispherical reflectance (DHR) measurements of three highly absorbing appliqués in the 2.5-14.3-microm IR spectral region are presented. In addition, scanning electron microscopy (SEM) images are presented to probe the surface morphology of these appliqués. DHR measurements of Energy Science Laboratory, Incorporated (ESLI), Rippey, and Rodel appliqués were obtained at incidence angles of 8 degrees, 30 degrees, and 50 degrees and as a function of S, P, and unpolarized incident light. The ESLI appliqué exhibited the lowest DHR for all angles and incident polarization states. SEM images revealed a fibrous structure for the ESLI appliqué with fiber diameters of the order of 7-8 microm, whereas the Rippey and the Rodel appliqués showed spongelike surfaces with pore diameters of 40-50 and 30-40 microm, respectively. All the appliqués use cavities or fibers in conjunction with carbon compounds to absorb IR radiation. The optical system designed to perform these measurements, a method for correcting off-normal DHR measurements in center-mount integrating spheres, and sources of measurement error are also discussed.
本文介绍了在2.5 - 14.3微米红外光谱区域对三种高吸收性贴花进行的角向和偏振方向半球反射率（DHR）测量。此外，还展示了扫描电子显微镜（SEM）图像以探究这些贴花的表面形态。在8度、30度和50度入射角下，以及作为S光、P光和非偏振入射光的函数，获得了能源科学实验室公司（ESLI）、里皮（Rippey）和罗德尔（Rodel）贴花的DHR测量结果。ESLI贴花在所有角度和入射偏振态下均表现出最低的DHR。SEM图像显示ESLI贴花具有纤维结构，纤维直径约为7 - 8微米，而里皮和罗德尔贴花则分别呈现出孔径为40 - 50微米和30 - 40微米的海绵状表面。所有贴花均使用腔体或纤维与碳化合物结合以吸收红外辐射。还讨论了用于进行这些测量的光学系统、中心安装积分球中非垂直DHR测量的校正方法以及测量误差来源。
