Cryogenic optical performance of the Cassini composite infrared spectrometer (CIRS) flight telescope

Patricia A. Losch; James J. Lyons III; John G. Hagopian

doi:10.1117/12.323742

17 September 1998 Cryogenic optical performance of the Cassini composite infrared spectrometer (CIRS) flight telescope

Patricia A. Losch, James J. Lyons III, John G. Hagopian

Proceedings Volume 3435, Cryogenic Optical Systems and Instruments VIII; (1998) https://doi.org/10.1117/12.323742
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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.

Citation Download Citation

Patricia A. Losch, James J. Lyons III, and John G. Hagopian "Cryogenic optical performance of the Cassini composite infrared spectrometer (CIRS) flight telescope", Proc. SPIE 3435, Cryogenic Optical Systems and Instruments VIII, (17 September 1998); https://doi.org/10.1117/12.323742

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