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19 January 1984 Small Angle Bidirectional Reflectance Distribution Function (BRDF) at 10 µm
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Abstract
The Sensor Systems Group (SSG), Inc., has been routinely using a BRDF measurement as an acceptance test for low scatter mirrors for use in high straylight rejection telescopes. Our conventional 10.6 μm BRDF measurement apparatus can characterize a low scatter sample from -5° to -50° off specular using a sampling ΩFOV of 2.2 X 10-4 sr. Recently, this apparatus was modified to allow successful measurement of a 24-inch focal length low scatter off-axis parabola from 0.5° to 5° off specular using a sampling QFOV of 1.2 X 10-5 sr. The measured BRDF data on this particular sample at 0.5, 1.0, 2.0 and 5.0 degrees are 6.5 X 10-4, 2.1 X 10-4, 6.7 X 10-5 and 1.5 X 10-5 per sr, respectively. The test configuration and design issues are described in this paper.
© (1984) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wallace K. Wong "Small Angle Bidirectional Reflectance Distribution Function (BRDF) at 10 µm", Proc. SPIE 0430, Infrared Technology IX, (19 January 1984); https://doi.org/10.1117/12.936385
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