Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1754..306b&link_type=abstract
In: Optical system contamination: Effects, measurement, control III; Proceedings of the Meeting, San Diego, CA, July 23, 24, 199
Physics
1
Mirrors, Particulates, Spaceborne Telescopes, Spacecraft Contamination, Sprayers, Vacuum Tests, Aluminum, Bidirectional Reflectance, Cryogenic Fluids, Jet Flow, Metal Sheets, Space Environment Simulation, Systems Simulation
Scientific paper
The location of particulates in and about a telescope assembly after jet spray cleaning of a contaminated primary mirror surface under vacuum conditions is determined. The Pathfinder experiment described here is designed to track both the location and level of residual particulate contamination in a simulated telescope assembly after jet spray. Silicon witness plates at various positions in the telescope mockup are used to track remaining contamination after jet spray cleaning of a severely contaminated primary mirror. Scatter measurement at a wavelength of 0.5145 microns is used to determine the contamination level of the silicon witness plates before and after jet spray cleaning. Analysis of scatter and visual particle counting data demonstrated that 99.99 percent of particles are removed. Residual particles levels inside the tube are determined to be on the order of background levels.
Brandt Werner V.
Krone-Schmidt Wilfried
Peterson Ronald V.
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