Comparability of spectral radiance calibrations of large aperture earth observing instruments based upon diffuse reflective panels and internally illuminated spherical integrator techniques

Details Comparability of spectral radiance calibrations of large aperture earth observing instruments based upon diffuse reflective panels and internally illuminated spherical integrator techniques Comparability of spectral radiance calibrations of large aperture earth observing instruments based upon diffuse reflective panels and internally illuminated spherical integrator techniques

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2209..148h&link_type=abstract

Proc. SPIE Vol. 2209, p. 148-159, Space Optics 1994: Earth Observation and Astronomy, M. G. Cerutti-Maori; Philippe Roussel; Eds

Physics

Optics

Scientific paper

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.

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