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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 31 — Nov. 1, 2007
  • pp: 7640–7651

Characterization of errors in the use of integrating-sphere systems in the calibration of scanning radiometers

Charles K. Gatebe, James J. Butler, John W. Cooper, Matthew Kowalewski, and Michael D. King  »View Author Affiliations

Applied Optics, Vol. 46, Issue 31, pp. 7640-7651 (2007)

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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.

© 2007 Optical Society of America

OCIS Codes
(110.1220) Imaging systems : Apertures
(110.6770) Imaging systems : Telescopes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.3150) Instrumentation, measurement, and metrology : Integrating spheres
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(120.5800) Instrumentation, measurement, and metrology : Scanners

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: July 2, 2007
Revised Manuscript: September 8, 2007
Manuscript Accepted: September 10, 2007
Published: October 23, 2007

Charles K. Gatebe, James J. Butler, John W. Cooper, Matthew Kowalewski, and Michael D. King, "Characterization of errors in the use of integrating-sphere systems in the calibration of scanning radiometers," Appl. Opt. 46, 7640-7651 (2007)

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