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Proceedings Paper

Stray-light reduction in a WFOV star tracker lens
Author(s): Isabella T. Lewis; Arno G. Ledebuhr; Timothy S. Axelrod; Scott A. Ruddell
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Paper Abstract

Lawrence Livermore National Laboratory (LLNL) has recently developed a wide-field-of- view (28 degree(s) X 44 degree(s)) camera for use as a star tracker navigational sensor. As for all sensors, stray light rejection performance is critical. Due to the baffle dimensions dictated by the large field angles, the 2-part sunshade/baffle configuration commonly seen on space- born telescopes is impractical. Meeting the required stray light rejection performance (of 10-7 Point Source Transmittance, (PST)) with a 1-part baffle required iterative APART modeling (APART is an industry standard stray light evaluation program), hardware testing, and mechanical design correction. This paper presents a chronology of lens and baffle improvements that resulted in the meeting of the stray light rejection goal outside the solar exclusion angle of the baffle stage. Comparisons with APART analyses are given, and future improvements in mechanical design are discussed. Stray light testing methods and associated experimental difficulties are presented.

Paper Details

Date Published: 1 December 1991
PDF: 19 pages
Proc. SPIE 1530, Optical Scatter: Applications, Measurement, and Theory, (1 December 1991); doi: 10.1117/12.50520
Show Author Affiliations
Isabella T. Lewis, Lawrence Livermore National Lab. (United States)
Arno G. Ledebuhr, Lawrence Livermore National Lab. (United States)
Timothy S. Axelrod, Lawrence Livermore National Lab. (United States)
Scott A. Ruddell, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 1530:
Optical Scatter: Applications, Measurement, and Theory
John C. Stover, Editor(s)

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