Bidirectional reflectance distribution function of the Infrared Astronomical Satellite solar-shield material

Details Bidirectional reflectance distribution function of the Infrared Astronomical Satellite solar-shield material Bidirectional reflectance distribution function of the Infrared Astronomical Satellite solar-shield material

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apopt..21.3323h&link_type=abstract

Applied Optics, vol. 21, Sept. 15, 1982, p. 3323-3325

Astronomy and Astrophysics

Astronomy

1

Bidirectional Reflectance, Infrared Astronomy Satellite, Infrared Telescopes, Radiation Shielding, Spaceborne Telescopes, Spectral Reflectance, Backscattering, Distribution Functions, Focal Plane Devices, Forward Scattering, Heat Shielding, Light Scattering, Radiance, Scatter Propagation, Solar Radiation, Thermal Protection

Scientific paper

The Infrared Astronomical Satellite (IRAS) telescope has an outer shield on it which is used to reduce the amount of thermal radiation that enters the telescope. The shield forms the first part of the baffle structure which reduces the photon incidence on the focal plane. It was, therefore, necessary to model this structure for scattering, and a required input for such modeling is the scattering characteristic of this surface. Attention is given to the measurement of the bidirectional reflectance distribution function (BRDF), the reflected radiance divided by the incident irradiance at 10.6 micrometers, 118 micrometers, and at several angles of incidence. Visual observation of the gold sample shows that there are striations which line up in a single direction. The data were, therefore, taken with the sample oriented in each of two directions.

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