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Proceedings Paper

Comparability of spectral radiance calibrations of large aperture earth observing instruments based upon diffuse reflective panels and internally illuminated spherical integrator techniques
Author(s): Donald F. Heath; Zongying Wei; William K. Fowler; V. Wayne Nelson; Ernest Hilsenrath
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Paper Abstract

A comparison has been made of spectral radiance calibrations of SBUV-2 instruments using two techniques. In one, a source of spectral radiance is obtained by illuminating a spectralon panel diffuser whose BRDF has been measured by NIST with a 1000 W FEL quartz-tungsten- halogen standard of spectral irradiance from NIST. In the other, the spectral irradiance of the aperture of an internally illuminated spherical integrator is measured relative the same NIST standard of spectral irradiance used with the panel diffuser. The spectral radiance of the sphere is calculated for a source of irradiance which is uniform and radiates as a Lambertian source over the area of the aperture. The agreement between the average of four spectral radiance calibrations of SBUV-2 instruments obtained with the spectralon panel diffuser technique with those obtained from five spectral radiance calibrations with the internally illuminated spherical integrator technique is better than one percent in the wavelength range of 250 - 340 nm. Repeated use of two spectralon panel diffusers over a two year period indicates a stability of diffuser BRDF of better than one percent.

Paper Details

Date Published: 13 September 1994
PDF: 12 pages
Proc. SPIE 2209, Space Optics 1994: Earth Observation and Astronomy, (13 September 1994); doi: 10.1117/12.185252
Show Author Affiliations
Donald F. Heath, Research Support Instruments, Inc. (United States)
Zongying Wei, Research Support Instruments, Inc. (United States)
William K. Fowler, Ball Aerospace Systems Group (United States)
V. Wayne Nelson, Ball Aerospace Systems Group (United States)
Ernest Hilsenrath, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 2209:
Space Optics 1994: Earth Observation and Astronomy
Guy Cerutti-Maori; Philippe Roussel, Editor(s)

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