Qualification of CO2 jet spray cleaning for use on magnesium-fluoride-protected aluminum coatings for the corrective optics space telescope axial replacement (COSTAR)

Details Qualification of CO2 jet spray cleaning for use on magnesium-fluoride-protected aluminum coatings for the corrective optics space telescope axial replacement (COSTAR) Qualification of CO2 jet spray cleaning for use on magnesium-fluoride-protected aluminum coatings for the corrective optics space telescope axial replacement (COSTAR)

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2261..334h&link_type=abstract

Proc. SPIE Vol. 2261, p. 334-346, Optical System Contamination: Effects, Measurements, and Control IV, A. Peter M. Glassford; Ed

Physics

Optics

1

Scientific paper

Low level particulate contamination of some of the COSTAR optics during environmental testing necessitated the development of a short duration, low pressure CO2 jet spray cleaning technique. The technique was proven to be compatible with the high reflectivity UV magnesium fluoride protected aluminum coatings applied to the COSTAR optics at the Goddard Space Flight Center (GSFC). These coatings are easily damaged by solvent flush techniques in the presence of this contamination and by conventional CO2 jet spray cleaning methods. In addition, the technique adopted here was compatible with the geometry of the fully integrated and aligned optics on the COSTAR. Eventually, thorough testing of intentionally contaminated test mirrors and a final UV throughput test of the flight optics indicated that the instrument would still meet specifications, therefore the COSTAR flight optics were not cleaned. However, we proceeded with the qualification of the process so that it would be available for use if cleaning became necessary prior to launch. Success criteria for the cleaning included minimal degradation of reflectivity, surface roughness, near-angle scattering, minimal production of pinholes in the coating, compatibility with the polyurethane bond applied to the optics and high efficiency of particulate removal. The technique was qualified for COSTAR specific coatings and particulate contamination and should be recertified for conditions departing from those baselined in our study.

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