Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apopt..21.2465b&link_type=abstract
Applied Optics, vol. 21, July 15, 1982, p. 2465, 2466
Astronomy and Astrophysics
Astronomy
2
Antireflection Coatings, Incident Radiation, Infrared Astronomy Satellite, Light Scattering, Spaceborne Telescopes, Specular Reflection, Backscattering, Baffles, Bidirectional Reflectance, Forward Scattering, Scatterometers
Scientific paper
BRDF (bidirectional reflectance distribution function) values for 0.000118 m radiation at different angles of incidence and different scattering angles from the Infrared Astronomical Satellite telescope baffle coated with Martin Black are presented. Data from scatterometer experiments are collected and the BRDF and beta - beta sub 0 (sin theta sub s - sin theta sub 0) values are calculated based on the geometry, the voltage readings, the attenuators in the beam, and the calculated reference levels. A composite curve of forward and backward scattering data for several angles of incidence shows a peak near the specular direction (beta - beta sub 0 = 0), which is the instrument profile reduced by the 20% specular reflection of the Martin Black. The nonspecular part of the reflectivity indicates the slightly specular but largely Lambertian character of the coating. Data for the specular reflectivity as a function of the incidence angle unexpectedly shows a decrease in the specular reflectance with increasing angle of incidence.
Bartell Frederick O.
Brooks L. D.
Hubbs John E.
Wolfe William L.
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