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Proceedings Paper

Comparison of laser-based and conventional calibrations of sun photometers
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Paper Abstract

Sun photometers are used to characterize the radiative properties of the atmosphere. They measure both the incident solar irradiance as well as the sky radiance (from scattered incident flux). Global networks of sun photometers provide data products such as aerosol optical thickness derived from these measurements. Instruments are typically calibrated for irradiance responsivity by cross-calibration against a primary reference sun photometer and for radiance responsivity using a lamp-illuminated integrating sphere source. A laser-based facility for Spectral Irradiance and Radiance Responsivity Calibrations using Uniform Sources (SIRCUS) has been developed at the National Institute of Standards and Technology. Sensors can be calibrated in this facility for absolute spectral irradiance and radiance responsivity with combined expanded (k = 2) uncertainties ranging from 0.15% to 0.25%. Two multi-channel filter radiometers used in the Sensor Intercomparison and Merger for Biological and Interdisciplinary Oceanic Studies (SIMBIOS) program of the National Aeronautics and Space Administration (NASA) at the Goddard Space Flight Center (GSFC) were calibrated for radiance and irradiance responsivity using conventional approaches and using laser-illuminated integrating spheres on SIRCUS. The different calibration methods are compared, the uncertainties are evaluated, and the impact on remote sensing applications is discussed.

Paper Details

Date Published: 5 November 2003
PDF: 12 pages
Proc. SPIE 5155, Ocean Remote Sensing and Imaging II, (5 November 2003); doi: 10.1117/12.508197
Show Author Affiliations
Nordine Souaidia, National Institute of Standards and Technology (United States)
Christophe G. Pietras, NASA Goddard Space Flight Ctr. (United States)
Giulietta S. Fargion, NASA Goddard Space Flight Ctr. (United States)
Robert A. Barnes, Science Applications International Corp. (United States)
Robert J. Frouin, Scripps Institution of Oceanography (United States)
Keith Lykke, National Institute of Standards and Technology (United States)
B. Carol Johnson, National Institute of Standards and Technology (United States)
Steven W. Brown, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 5155:
Ocean Remote Sensing and Imaging II
Robert J. Frouin; Gary D. Gilbert; Delu Pan, Editor(s)

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