Ultraviolet scattering by thin carbon foils

Richard R. Zito

doi:10.1117/12.328464

30 October 1998 Ultraviolet scattering by thin carbon foils

Richard R. Zito

Proceedings Volume 3426, Scattering and Surface Roughness II; (1998) https://doi.org/10.1117/12.328464
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Characterization of the transmission and scattering of ultraviolet light through thin carbon foils is central to the operation of high-energy neutral atom (HENA) images. When unwanted external UV enters a HENA imager through its carbon foil window, some of this radiation is scattered toward the internal side mounted detectors. These detectors may then produce a 'false count' which is unrelated to any neutral particle inspection. It is against the background of ultraviolet produced false counts that the true counts of high-energy neutral particles must be made. This report describes the UV transmission and scattering through thin carbon foils at the Lyman-(alpha) wavelength of 1216 angstroms; the dominant ultraviolet wavelength in the solar system. The films tested were flight hardware from the HENA imager of the IMAGE (Imager for Magnetopause-to-Aurora Global Exploration) spacecraft. The imager ultimately produces a two dimensional map by measuring the neutral atom flux in different directions. The IMAGE spacecraft is scheduled for launch on Jan 1, 2000. A twin HENA was also placed aboard the Cassini mission to Saturn spacecraft, which was successfully launched on Dec. 5, 1997.

Citation Download Citation

Richard R. Zito "Ultraviolet scattering by thin carbon foils", Proc. SPIE 3426, Scattering and Surface Roughness II, (30 October 1998); https://doi.org/10.1117/12.328464

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KEYWORDS

Carbon

Imaging systems

Sensors

Ultraviolet radiation

Chemical species

Electrons

Scattering

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