Pathfinder experiment on particulates after jet spray

Werner V. Brandt; Wilfried Krone-Schmidt; Ronald V. Peterson

doi:10.1117/12.140742

18 December 1992 The Pathfinder experiment on particulates after jet spray

Werner V. Brandt, Wilfried Krone-Schmidt, Ronald V. Peterson

Proceedings Volume 1754, Optical System Contamination: Effects, Measurement, Control III; (1992) https://doi.org/10.1117/12.140742
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Werner V. Brandt, Wilfried Krone-Schmidt, and Ronald V. Peterson "The Pathfinder experiment on particulates after jet spray", Proc. SPIE 1754, Optical System Contamination: Effects, Measurement, Control III, (18 December 1992); https://doi.org/10.1117/12.140742

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