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Proceedings Paper

Contamination control of the SABER cryogenic infrared telescope
Author(s): James S. Dyer; Steven Brown; Roy W. Esplin; Galen Hansen; Scott M. Jensen; John L. Stauder; Lorin Zollinger
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Paper Abstract

The SABER instrument (Sounding of the Atmosphere using Broadband Emission Spectroscopy) is a cryogenic infrared sensor on the TIMED spacecraft with stringent molecular and particulate contamination control requirements. The sensor measures infrared emissions from atmospheric constituents in the earth limb at altitudes ranging from 60 to 180 km using radiatively-cooled 240 K optics and a mechanically-refrigerated 75 K detector. The stray light performance requirements necessitate nearly pristine foreoptics. The cold detector in a warm sensor presents challenges in controlling the cryodeposition of water and other condensable vapors. Accordingly, SABER incorporates several unique design features and test strategies to control and measure the particulate and molecular contamination environment. These include internal witness mirrors, dedicated purge/depressurization manifolds, labyrinths, cold stops, and validated procedures for bakeout, cooldown, and warmup. The pre-launch and on-orbit contamination control performance for the SABER telescope will be reviewed.

Paper Details

Date Published: 11 September 2002
PDF: 11 pages
Proc. SPIE 4774, Optical System Contamination: Effects, Measurements, and Control VII, (11 September 2002); doi: 10.1117/12.481652
Show Author Affiliations
James S. Dyer, Utah State Univ. (United States)
Steven Brown, Utah State Univ. (United States)
Roy W. Esplin, Utah State Univ. (United States)
Galen Hansen, Utah State Univ. (United States)
Scott M. Jensen, Utah State Univ. (United States)
John L. Stauder, Utah State Univ. (United States)
Lorin Zollinger, Utah State Univ. (United States)

Published in SPIE Proceedings Vol. 4774:
Optical System Contamination: Effects, Measurements, and Control VII
Philip T. C. Chen; O. Manuel Uy, Editor(s)

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