Physics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983spie..428..172w&link_type=abstract
IN: Infrared technology IX; Proceedings of the Ninth Annual Meeting, San Diego, CA, August 23-25, 1983 (A85-22673 09-35). Bellin
Physics
Bidirectional Reflectance, Infrared Reflection, Infrared Telescopes, Light Scattering, Mirrors, Distribution Functions, Light Beams, Radiometers, Sensitivity, Subassemblies
Scientific paper
The Sensor Systems Group has been routinely using a BRDF measurement as an acceptance test for low scatter mirrors for use in high-straylight rejection telescopes. The conventional 10.6 micron BRDF measurement apparatus can characterize a low scatter sample from about 5 deg to about 50 deg off specular using a sampling Omega-FOV of 0.00022 sr. Recently, this apparatus was modified to allow successful measurement of a 24-inch focal length low-scatter off-axis parabola from 0.5 deg to 5 deg off specular using a sampling Omega-FOV of 0.000012 sr. The measured BRDF data on this particular sample at 0.5, 1.0, 2.0 and 5.0 degrees are 0.00065, 0.00021, 0.000067 and 0.000015 per sr, respectively. The test configuration and design issues are described in this paper.
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