Instrument Information
IDENTIFIER urn:nasa:pds:context:instrument:uvis.co::1.3
NAME Cassini Oribiter Ultraviolet Imaging Spectrograph
TYPE Spectrometer
DESCRIPTION The Ultraviolet Imaging Spectrograph Subsystem (UVIS) of Cassini Orbiter is a set of telescopes used to measure ultraviolet light from the Saturn system's atmospheres, rings, and surfaces. The UVIS will also observe the fluctuations of starlight and sunlight as the sun and stars move behind the rings and the atmospheres of Titan and Saturn, and it will determine the atmospheric concentrations of hydrogen and deuterium. The UVIS has two spectrographic channels: the extreme ultraviolet (EUV) channel and the far ultraviolet (FUV) channel. The UVIS also includes a high-speed photometer channel, a hydrogen-deuterium absorption cell channel, and an electronic and control subassembly. The EUV will be used for imaging spectroscopy and spectroscopic measurements of the structure and composition of the atmospheres of Titan and Saturn. It consists of a telescope with a three-position slit changer, a baffle system, and a spectrograph with a CODACON microchannel plate detector and associated electronics. The telescope consists of an off-axis parabolic section with a focal length of 100 mm, a 22 mm by 30 mm aperture, and a baffle with a field of view of 3.67 degrees by 0.34 degrees. The FUV will be used for imaging spectroscopy and spectroscopic measurements of the structure and composition of the atmospheres of Titan, Saturn, and of the rings. The FUV is similar to the EUV channel except for the grating ruling density, optical coatings, and detector details. The high-speed photometer channel (HSP) will perform stellar occultation measurements of the structure and density of material in the rings. The hydrogen-deuterium absorption cell channel (HDAC) will be used to measure hydrogen and deuterium in the Saturn system using a hydrogen cell, a deuterium cell, and a channel electron multiplier (CEM) detector to record photons not absorbed in the cells.
MODEL IDENTIFIER
NAIF INSTRUMENT IDENTIFIER
SERIAL NUMBER not applicable
REFERENCES Esposito, L.W., J.E. Colwell, K. Larsen, W.E. McClintock, A.I.F. Stewart, J. Tew Hallett, D.E. Shemansky, J.M. Ajello, C.J. Hansen, A.R. Hendrix, R.A. West, H.U. Keller, A. Korth, W.R. Pryor, R. Reulke, and Y.L. Yung, Ultra-Violet Imaging Spectroscopy shows an active Saturn system, Science, 307, 1251-1255, 2005, LASP reprint 1000.