Physics – Optics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apopt..46.7640g&link_type=abstract
Applied Optics IP, vol. 46, Issue 31, pp.7640-7651
Physics
Optics
3
Apertures, Telescopes, Remote Sensing And Sensors, Integrating Spheres, Radiometry, Scanners
Scientific paper
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.
Butler James J. Jr.
Cooper John W.
Gatebe Charles K.
King Michael D.
Kowalewski Matthew
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