Throughput of the composite infrared spectrometer (CIRS) mid-infrared (MIR) channel for the Cassini mission to Saturn

John G. Hagopian; Patricia A. Losch; Kenneth P. Stewart; Donald E. Jennings; Anthony J. Martino

doi:10.1117/12.323737

17 September 1998 Throughput of the composite infrared spectrometer (CIRS) mid-infrared (MIR) channel for the Cassini mission to Saturn

John G. Hagopian, Patricia A. Losch, Kenneth P. Stewart, Donald E. Jennings, Anthony J. Martino

Author Affiliations +

Proceedings Volume 3435, Cryogenic Optical Systems and Instruments VIII; (1998) https://doi.org/10.1117/12.323737
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

The Composite Infrared Spectrometer of the Cassini mission to Saturn has two interferometers covering the far infrared and mid infrared wavelength region. The instrument was aligned at ambient temperature, but operates at 170 Kelvin and has challenging interferometric alignment tolerances. Cryogenic alignment tests of the instrument indicated that it should suffer minimal degradation due to the cooldown from ambient to operational temperature. System level tests performed by the calibration team indicated a lower than expected signal level on the mid infrared channel, while providing ambiguous optical throughput data. Therefore it became imperative to develop a metric that could be used to determine the instrument performance at both the instrument and system levels, at ambient and cryogenic temperature. Modulation efficiency and throughput measurements were performed and new analytical models developed to evaluate the status of the instrument. Methodologies are detailed, empirical and analytical data are reconciled and deviations from design values explained.

Citation Download Citation

John G. Hagopian, Patricia A. Losch, Kenneth P. Stewart, Donald E. Jennings, and Anthony J. Martino "Throughput of the composite infrared spectrometer (CIRS) mid-infrared (MIR) channel for the Cassini mission to Saturn", Proc. SPIE 3435, Cryogenic Optical Systems and Instruments VIII, (17 September 1998); https://doi.org/10.1117/12.323737

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