Ambient pressure offgassing apparatus for screening materials utilized in environments supporting optical spaceborne systems

Details Ambient pressure offgassing apparatus for screening materials utilized in environments supporting optical spaceborne systems Ambient pressure offgassing apparatus for screening materials utilized in environments supporting optical spaceborne systems

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1329..299h&link_type=abstract

IN: Optical system contamination: Effects, measurement, control II; Proceedings of the Meeting, San Diego, CA, July 10-12, 1990

Statistics

Applications

Aerospace Environments, Hubble Space Telescope, Offgassing, Selection, Ultraviolet Spectrophotometers, Degradation, Gas Chromatography, Optical Properties

Scientific paper

The method and setup developed to test optical support materials for the HST are presented in terms of general applications to the ambient offgassing of contamination-sensitive instruments. An ex situ vacuum UV spectrophotometer is employed to analyze optical witness samples for optical degradation related to offgassing contaminants that are condensed onto the samples. A table of the ambient offgassing-test results lists the weight loss, wavelengths, and presence of visible films on 15 materials. The offgassing initial requirement of less than 12 ppm and/or the requirement after testing of less than 0.1 ppm are not fulfilled in the cases of seven materials. The testing procedure is found to be an efficient method for screening nonmetallic materials that support spaceborne optical systems. The offgassing data can support standard outgassing data to screen candidate materials effectively.

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