Long-term comparison of spectralon BRDF measurements in the ultraviolet

Georgi T. Georgiev; James J. Butler

doi:10.1117/12.559920

26 October 2004 Long-term comparison of spectralon BRDF measurements in the ultraviolet

Georgi T. Georgiev, James J. Butler

Proceedings Volume 5542, Earth Observing Systems IX; (2004) https://doi.org/10.1117/12.559920
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Long-term (i.e. multi-year) measurements of the Bidirectional Reflectance Distribution Function (BRDF) of three laboratory Spectralon diffuse targets in the ultraviolet are presented. The Spectralon targets were used in the pre-launch radiance calibration of the Solar Backscatter Ultraviolet/2 (SBUV/2) satellite instruments on NOAA 14 and 16. The BRDF data were obtained between 1994 and 2003 using the scatterometer located in the National Aeronautics and Space Administration's Goddard Space Flight Center (NASA's GSFC) Diffuser Calibration Facility (DCaF). The targets were measured at 13 wavelengths between 230 nm and 425 nm and at incident and scatter angles used in the SBUV/2 pre-launch calibration. With the exception of a spurious measurement in 1995, the percent difference in the measured BRDF of the first target, designated H1, was within ±0.7 % from 252nm to 425nm between 1994 and 2000. The percent difference in the measured BRDF of the second target, designated H2, was also within ±0.7 % over the same spectral range between 1997 and 2003. At 230 nm, the H1 and H2 BRDF measurements show larger differences primarily due to reduced signal to noise in the measurements. The combined measurement uncertainty of the reported BRDF measurements is 1.0% (k=1). The comparison also shows how the ultraviolet BRDF of these Spectralon samples changed over time under cleanroom deployment conditions.

Citation Download Citation

Georgi T. Georgiev and James J. Butler "Long-term comparison of spectralon BRDF measurements in the ultraviolet", Proc. SPIE 5542, Earth Observing Systems IX, (26 October 2004); https://doi.org/10.1117/12.559920

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available