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Proceedings Paper

Cryogenic Interferometric Alignment (CIA) of the Composite Infrared Spectrometer (CIRS) engineering unit for the Cassini mission to Saturn
Author(s): John G. Hagopian
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Paper Abstract

The composite infrared spectrometer (CIRS) of the Cassini mission to Saturn has two interferometers covering the far- IR (FIR) and mid-IR (MIR) wavelength region. The instrument is aligned at ambient temperature, but operates at 170 Kelvin and has challenging interferometric alignment tolerances. Interferometric alignment sensitivity tests of the CIRS FIR breadboard indicated that he instrument was sensitive to alignment perturbations in the few arc second regime. Early cryogenic testing indicated that the instrument structure was not stable during cryogenic cycling; therefore, remote alignment of the FIR channel beamsplitter was implemented to recover modulation efficiency. The hardware developed to facilitate the in situ alignment at cryogenic temperatures is described, as are the results of several thermal cycles.

Paper Details

Date Published: 14 October 1996
PDF: 13 pages
Proc. SPIE 2814, Cryogenic Optical Systems and Instruments VII, (14 October 1996); doi: 10.1117/12.254149
Show Author Affiliations
John G. Hagopian, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 2814:
Cryogenic Optical Systems and Instruments VII
Lawrence G. Burriesci; James B. Heaney, Editor(s)

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