Spectralon Solar Diffuser BRDF extrapolation to 2.25 microns for JPSS J1, J2, and J3

Vijay Murgai; Staci Klein

doi:10.1117/12.2530399

9 September 2019 Spectralon Solar Diffuser BRDF extrapolation to 2.25 microns for JPSS J1, J2, and J3

Vijay Murgai, Staci Klein

Proceedings Volume 11127, Earth Observing Systems XXIV; 111270H (2019) https://doi.org/10.1117/12.2530399
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

The Visible/Infrared Imaging Radiometer Suite (VIIRS) is a key sensor on the Suomi National Polar-orbiting Partnership (NPP) satellite and the Joint Polar Satellite System (JPSS). VIIRS collects Earth radiometric and imagery data in 22 spectral bands from 0.4 to 12.5 μm. Radiometric calibration of the reflective bands in the 0.4 to 2.5 μm wavelength range is performed by measuring the sunlight reflectance from Spectralon. Reflected sun light is directly proportional to the Bidirectional Reflectance Distribution Function (BRDF) of the Spectralon. Previously BRDF measurements of the Spectralon for JPSS J1 and J2 in the 0.4 – 1.63 μm wavelength using PASCAL (Polarization And Scatter Characterization Analysis of Lambertian materials) have been presented. However calibration is needed outside this measurement range at 2.25 μm. This paper presents an extrapolation of the measurements to 2.25 μm based on BRDF measurements in the as use geometry at lower wavelengths and hemispherical reflectance measurements of witness samples from 0.4 to 2.5 μm. The extrapolation relies on the spectral variation of BRDF for J1, J2, and J3 Spectralon panels as well as the hemispherical reflectance of witness samples with extrapolation provided for the entire range of sun angles of incidence. The results are compared with J1 witness sample extrapolation done by NASA. J3 BRDF results are also presented.

Citation Download Citation

Vijay Murgai and Staci Klein "Spectralon Solar Diffuser BRDF extrapolation to 2.25 microns for JPSS J1, J2, and J3", Proc. SPIE 11127, Earth Observing Systems XXIV, 111270H (9 September 2019); https://doi.org/10.1117/12.2530399

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