The goal of this project was to measure the change in the absorbance of spacecraft materials due to changes in the surface of the material. The absorbance was obtained by measuring reflectance and transmittance. We found that modifying the surface of a material did affect the material’s specular reflectance. However, the change may not have been entirely due to an increase in absorbance, but may also imply an increase in the diffuse reflection. To understand the affect on absorbance, diffuse reflectance and transmission will need to be measured. This will lead to a prediction of how surface modification affects the charging of spacecraft.
Amberly Evans Jensen (with JR Dennison), ”The Effects of Surface Roughness on Diffuse Optical Reflection and Photoyields on Spacecraft Materials,” Senior Project, Utah State University, Logan, UT, May 2012.