Optical design of the ultraviolet imaging spectrograph for the Cassini mission to Saturn

William E. McClintock; George M. Lawrence; Richard A. Kohnert; Larry W. Esposito

doi:10.1117/12.60597

29 June 1992 Optical design of the ultraviolet imaging spectrograph for the Cassini mission to Saturn

William E. McClintock, George M. Lawrence, Richard A. Kohnert, Larry W. Esposito

Proceedings Volume 1745, Instrumentation for Planetary and Terrestrial Atmospheric Remote Sensing; (1992) https://doi.org/10.1117/12.60597
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

When the Cassini spacecraft arrives at Saturn early in the next century it will carry an UltraViolet Imaging Spectrograph (IJVIS) designed and built by the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado. Observations made with the UVIS will support a broad set of scientific investigations including spectroscopy, imaging, and occultations. The UVIS consists of three spectroscopic channels covering the wavelength ranges 55—i 15 nm, 1 15—190 nm, and 160— 320 nm. Each channel has an off-axis parabolic telescope followed by a toroidal grating spectrograph and an imaging microchannel plate-CODACON detector. Mirror coatings and detector photocathode materials optimize the sensitivity of each channel for its particular wavelength range. Spectrograph entrance slit mechanisms provide four independent spectral and spatial resolution modes for each of the three channels. A fourth optical train consisting of an off-axis parabolic telescope and solar blind photomultiplier tube with a CsI photocathode provides a high sensitivity photometer mode within the UVIS. The UVIS configuration was selected as a balanced solution to a large number of engineering and scientific constraints. We describe these constraints, the optical design, and the anticipated performance of the instrument.

Citation Download Citation

William E. McClintock, George M. Lawrence, Richard A. Kohnert, and Larry W. Esposito "Optical design of the ultraviolet imaging spectrograph for the Cassini mission to Saturn", Proc. SPIE 1745, Instrumentation for Planetary and Terrestrial Atmospheric Remote Sensing, (29 June 1992); https://doi.org/10.1117/12.60597

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