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Proceedings Paper

Cryogenic optical performance of the Cassini composite infrared spectrometer (CIRS) flight telescope
Author(s): Patricia A. Losch; James J. Lyons; John G. Hagopian
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Paper Abstract

The Cassini Composite InfraRed Spectrometer half-mirror diameter beryllium flight telescope's optical performance was tested at the instrument operating temperature of 170 Kelvin. The telescope components were designed at Goddard Space Flight Center (GSFC) but fabricated out-of-house and then assembled, aligned, and tested upon receipt at GSFC. A 24-inch aperture cryogenic test facility utilizing a 1024 X 1024 CCD array was developed at GSFC specifically for this test. The telescope's image quality (measured as encircled energy), boresight stability and focus stability were measured. The gold coated beryllium design exceeded the cold image performance requirement of 80% encircled energy within a 460 micron diameter cycle.

Paper Details

Date Published: 17 September 1998
PDF: 11 pages
Proc. SPIE 3435, Cryogenic Optical Systems and Instruments VIII, (17 September 1998); doi: 10.1117/12.323742
Show Author Affiliations
Patricia A. Losch, NASA Goddard Space Flight Ctr. (United States)
James J. Lyons, NASA Goddard Space Flight Ctr. (United States)
John G. Hagopian, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 3435:
Cryogenic Optical Systems and Instruments VIII
James B. Heaney; Lawrence G. Burriesci, Editor(s)

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