The Spartan-281 Far Ultraviolet Imaging Spectrograph

The Naval Research Laboratory's Far Ultraviolet Imaging Spectrograph (FUVIS) is currently under development for flight as a Spartan shuttle payload. The science objectives are concerned with spectroscopy of diffuse sources in the far-UV (1000-2000 A) with very high sensitivity and with moderate spatial and spectral resolution. Sources of interest include diffuse nebulae, the gener-al galactic background radiation, and artificially induced radiations associated with the space shuttle vehicle (e.g., surface glow and RCS thruster firings). The measurements complement and support other investigations, such as with the Hubble Space Telescope and the Astro shuttle instruments, which have higher spectral and spatial resolutions but lower diffuse-source sensitivities and smaller fields of view. The principles, design, and sounding-rocket flight experience of FUVIS are discussed, as well as the adaptations required for flight in the Spartan mission. The instrument can be adapted for future, missions by use Of an electron-bombarded CCD array in place of electrographic film recording. The data reduction and analysis plans for the Spartan-281 FUVIS results are presented.

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