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Proceedings Paper

Pioneer-Venus Large Probe Infrared Radiometer (LIR) Optical System
Author(s): F. Gerald Brown; Jerry Gilland; Ralph Hassig; R. W. Boese
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Paper Abstract

The LIR instrument has been developed for the NASA Ames Research Center for use in the 1978 Venus Atmospheric Probe Mission. The mission objectives are to determine the nature and composition of the clouds, the composition and structure of the atmosphere, and the atmospheric circulation pattern of the planet Venus. The The Large Probe Infrared Radiometer (LIR) is a six-channel (3 to 50 μm) internally calibrated radiometer which measures the radiance difference at ±45° to the horizontal as viewed through a single diamond window in the spacecraft. The LIR optical system consists of a unique arrangement of hollow light pipes which optically couple a six element detector/filter array to the spacecraft window while mechanically and thermally isolating the array from the window's harsh thermal environment. A single rotating section with a 45° bend and containing a collimator alternately views up and down through director/extender pipes located adjacent to the diamond window. Light is transferred from the rotating section to a fixed section containing a diamond diffuser to scramble the light. This minimizes asymmetries and improves channel field of view overlap.

Paper Details

Date Published: 9 November 1977
PDF: 7 pages
Proc. SPIE 0124, Modern Utilization of Infrared Technology III, (9 November 1977); doi: 10.1117/12.955851
Show Author Affiliations
F. Gerald Brown, Ball Brothers Research Corporation (United States)
Jerry Gilland, Ball Brothers Research Corporation (United States)
Ralph Hassig, Ball Brothers Research Corporation (United States)
R. W. Boese, Ames Research Center (United States)

Published in SPIE Proceedings Vol. 0124:
Modern Utilization of Infrared Technology III
Irving J. Spiro, Editor(s)

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