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Proceedings Paper

Off-axis response measurement of the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) telescope
Author(s): John L. Stauder; Lynne R. Bates; James S. Dyer; Roy W. Esplin; Duane O. Miles
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Paper Abstract

The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument is a 10-channel earth limb-viewing sensor that measures atmospheric emissions in the spectral range of 1.27 μm to 16.9 μm. SABER is part of NASA's Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) mission, which was successfully launched in December 2001. Uncommon among limb-viewing sensors, SABER employs an on-axis telescope design with reimaging optics to allow for an intermediate field stop and a Lyot stop. Additional stray light protection is achieved by an innovative inner Lyot stop, which is placed conjugate to the secondary obscuration and support structure. Presented in this paper is the off-axis response of SABER as measured in the Terrestrial Black Hole off-axis scatter facility at the Space Dynamics Laboratory. The measurement was made at visible wavelengths; thus, the response is only representative of SABER's short wavelength channels. The measurement validated the stray light design and complemented the APART software model, which predicts that mirror scatter is the dominant stray light mechanism at short wavelengths. In addition, estimates of the mirror bi-directional reflectance distribution function (BRDF) were made. The off-axis response measurement indicates that SABER is an exceptional stray light suppression telescope.

Paper Details

Date Published: 16 October 2002
PDF: 9 pages
Proc. SPIE 4767, Current Developments in Lens Design and Optical Engineering III, (16 October 2002); doi: 10.1117/12.452295
Show Author Affiliations
John L. Stauder, Utah State Univ. (United States)
Lynne R. Bates, Utah State Univ. (United States)
James S. Dyer, Utah State Univ. (United States)
Roy W. Esplin, Utah State Univ. (United States)
Duane O. Miles, Utah State Univ. (United States)

Published in SPIE Proceedings Vol. 4767:
Current Developments in Lens Design and Optical Engineering III
Robert E. Fischer; Warren J. Smith; R. Barry Johnson, Editor(s)

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