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Proceedings Paper

Maintaining flatness of a large-aperture potassium bromide beamsplitter through mounting and vibration
Author(s): Patricia A. Losch; James J. Lyons; Armando Morrell; James B. Heaney
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Paper Abstract

The Composite Infrared Spectrometer (CIRS) instrument on the Cassini Mission launched in October of 1997. The CIRS instrument contains a mid-infrared (MIR) and a far-infrared interferometer and operates at 170 Kelvin. The MIR is a Michelson Fourier transform spectrometer utilizing a 76 mm (3 inch) diameter potassium bromide beamsplitter and compensator pair. The potassium bromide elements were tested to verify effects of cooldown and vibration prior to integration into the instrument. The instrument was then aligned to ambient temperatures, tested cryogenically and re-verified after vibration. The stringent design optical figure requirements for the beamsplitter and compensator included fabrication errors, mounting stress and vibration load effects. This paper describes the challenges encountered in mounting the elements to minimize distortion and to survive vibration.

Paper Details

Date Published: 17 September 1998
PDF: 9 pages
Proc. SPIE 3435, Cryogenic Optical Systems and Instruments VIII, (17 September 1998); doi: 10.1117/12.323729
Show Author Affiliations
Patricia A. Losch, NASA Goddard Space Flight Ctr. (United States)
James J. Lyons, NASA Goddard Space Flight Ctr. (United States)
Armando Morrell, NASA Goddard Space Flight Ctr. (United States)
James B. Heaney, Swales Aerospace (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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