18 December 1992 Photodeposition of molecular contaminants with a vacuum ultraviolet solar illumination lamp
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Several molecular species (hydrocarbons) outgassed from spacecraft materials adhere and darken on satellite optical surfaces when exposed to solar ultraviolet (UV) radiation. This absorbing molecular film of photolyzed contamination can severely degrade spacecraft optical system performance. In the Optical Scatter and Contamination Effects Facility (OSCEF) at TRW outgassed molecular species can be photo-deposited onto witness optics and an adjacent quartz crystal microbalance with vacuum ultraviolet radiation, simulating a spacecraft UV illuminated environment. Measurement of outgassing rates and concomitant photodeposition efficiencies provides useful data required in the selection of present and new spacecraft materials and accurate predictions of platform operating lifetimes. This paper will describe the methods used to measure the molecular outgassing and photodeposition rates of species from several spacecraft materials in which the samples are used in their operational configurations (no heating or grinding of the sample as in the ASTM E595 test), thus providing data highly representative of on-orbit photodeposition conditions.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark E. Frink, Mark E. Frink, Mark A. Folkman, Mark A. Folkman, Lane A. Darnton, Lane A. Darnton, } "Photodeposition of molecular contaminants with a vacuum ultraviolet solar illumination lamp", Proc. SPIE 1754, Optical System Contamination: Effects, Measurement, Control III, (18 December 1992); doi: 10.1117/12.140751; https://doi.org/10.1117/12.140751

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