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12 October 2015 Creation and validation of Spectralon PTFE BRDF targets and standards
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Abstract
Sintered PTFE is an extremely stable, near-perfect Lambertian reflecting diffuser and calibration standard material that has been used by national labs, space, aerospace and commercial sectors for over two decades. New uncertainty targets of 2% on-orbit absolute validation in the Earth Observing Systems community have challenged the industry to improve is characterization and knowledge of almost every aspect of radiometric performance (space and ground). Assuming “near perfect” reflectance for angular dependent measurements is no longer going to suffice for many program needs. The total hemispherical spectral reflectance provides a good mark of general performance; but, without the angular characterization of bidirectional reflectance distribution function (BRDF) measurements, critical data is missing from many applications and uncertainty budgets. Therefore, traceable BRDF measurement capability is needed to characterize sintered PTFE’s angular response and provide a full uncertainty profile to users. This paper presents preliminary comparison measurements of the BRDF of sintered PTFE from several laboratories to better quantify the BRDF of sintered PTFE, assess the BRDF measurement comparability between laboratories, and improve estimates of measurement uncertainties under laboratory conditions.
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Christopher Durell, Dan Scharpf, Greg McKee, Michelle L'Heureux, Georgi Georgiev, Gael Obein, and Catherine Cooksey "Creation and validation of Spectralon PTFE BRDF targets and standards", Proc. SPIE 9639, Sensors, Systems, and Next-Generation Satellites XIX, 96391D (12 October 2015); https://doi.org/10.1117/12.2195503
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