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5 April 1989 BRDF Round Robin
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In-plane scatter at 0.6328 μ m was measured from a master set of four samples at 18 optical scatter measurement facilities in the United States. They included government laboratories, universities and industry. The samples were a diffuse white, diffuse black, Molybdenum mirror (45 A rms) and Aluminum mirror (7 A rms). Measured scatter at an incidence angle of 10 degrees and a forward scatter angle of 35 degrees varied by a factor of 2 on the diffuse white (mean = 0.27/sr) and a factor of 5 on the aluminum mirror (mean = 61 ppm/sr). The variations in measured scatter values are a result of inadequate calibration techniques, incorrect gain factors, incorrect optical filter factors, inadequate instrumentation or, in some cases, incorrect operating practices. As a result of this round robin study, we are now pursuing a "standard test method" for measurement of scatter. We are also putting increased emphasis on in-house scatter measurement capability, training and availability of reference samples.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas A Leonard and Michael Pantoliano "BRDF Round Robin", Proc. SPIE 0967, Stray Light and Contamination in Optical Systems, (5 April 1989);


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