Document Detail


Characterization of errors in the use of integrating-sphere systems in the calibration of scanning radiometers.
MedLine Citation:
PMID:  17973008     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Laboratory measurements were performed to characterize the geometrical effects in the calibration of the NASA's cloud absorption radiometer (CAR). The measurements involved three integrating sphere sources (ISSs) operated at different light levels and experimental setups to determine radiance variability. The radiance gradients across the three ISS apertures were 0.2%-2.6% for different visible, near-infrared, and shortwave infrared illumination levels but <15% in the UV. Change in radiance with distance was determined to be 2%-20%, being highest in the UV. Radiance variability due to the edge effects was found to be significant; as much as 70% due to the sphere aperture and <10% due to the CAR telescope's secondary mirror.
Authors:
Charles K Gatebe; James J Butler; John W Cooper; Matthew Kowalewski; Michael D King
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  46     ISSN:  0003-6935     ISO Abbreviation:  Appl Opt     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-11-01     Completed Date:  2008-02-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7640-51     Citation Subset:  -    
Affiliation:
Goddard Earth Sciences and Technology Center, University of Maryland, Baltimore County, Baltimore, Maryland 21228, USA. charles.k.gatebe@nasa.gov
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