Title :
Directional degradation of spectralon diffuser under ionizing radiation for calibration of space-based sensors
Author :
Georgiev, G.T. ; Butler, J.J. ; Kowalewski, M.G. ; Ding, L.
Author_Institution :
Sigma Space Corp., Lanham, MD, USA
Abstract :
Assessment of the effect of Vacuum Ultra Violet (VUV) irradiation on the Bidirectional Reflectance Distribution Function (BRDF) of Spectralon is presented in this paper. The sample was a 99% white Spectralon calibration standard irradiated with VUV source positioned at 60° off the irradiation direction for a total of 20 hours. The BRDF before and after VUV irradiation was measured and compared at number of wavelengths in the UV, VIS and IR. Non-isotropic directional degradation of Spectralon diffuser under ionizing radiation was detected at different BRDF measurement geometries primarily at UV spectral range. The 8° directional/hemispherical reflectance of the same sample was also measured and compared from 200nm to 2500nm.
Keywords :
calibration; geophysical equipment; geophysical techniques; radiometry; remote sensing; ultraviolet radiation effects; BRDF measurement geometry; IR wavelength; MODIS; Spectralon diffuser; UV spectral range; UV wavelength; VUV irradiation effect assessment; VUV source; bidirectional reflectance distribution function; hemispherical reflectance; ionizing radiation; irradiation direction; nonisotropic directional degradation; of space-based sensor calibration; time 20 hour; vacuum ultraviolet irradiation; visible wavelength; wavelength 200 nm to 2500 nm; white Spectralon calibration standard; Calibration; Degradation; Extraterrestrial measurements; Pollution measurement; Radiation effects; Reflectivity; Wavelength measurement; BRDF; Multiangular; Reflectance; Remote Sensing; Spectralon;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2012 IEEE International
Conference_Location :
Munich
Print_ISBN :
978-1-4673-1160-1
Electronic_ISBN :
2153-6996
DOI :
10.1109/IGARSS.2012.6352337
