Share Email Print
cover

Proceedings Paper

Hubble Space Telescope Contamination Analysis
Author(s): Michael C. Fong; Milford A. Peterson; Aleck L. Lee
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

This paper summarizes the results of several contamination analyses performed in support of Hubble Space Telescope (HST) system development. The discussion topics encompass several flight-phase operational and contamination events: prelaunch standby, on-orbit closed-door and open-door operations, HST interior outgassing, and ram-induced pressure rise in the Aft Shroud (AS) region. A number of refined analytical models (computer codes) have been used to carry out these analyses. The results indicate that the contaminant build-up during prelaunch and flight operations will be well within the HST contaminant allowable limits (about 50% the budget allocation). Specific findings are as follows: (a) no significant contamination of HST primary mirror (PM) and secondary mirror (SM) due to orbiter purge air will occur during prelaunch standby even with a worst-case scenario; (b) using a diffusion flux model and from available data on payload bay (PLB) sources, the deposition rates on the HST PM and SM have been predicted to be 0.4 angstrom/hr and 2.7 angstroms/hr, respectively, during on-orbit closed-door operations; (c) particulate contamination based on a scenario involving two astronauts during extravehicular activity (EVA) in conjunction with instrument change-out has been found to be negligibly small; (d) certain lubricating oils, if deposited on and not removed from HST interior surfaces, could cause significant contamination on HST critical optics; however, this potential contamination has been eliminated by HST thermal hakeout; (e) by utilizing a Monte Carlo model, the ram-induced pressure rise in the AS region has been predicted to be insignificant and would not violate the electric breakdown requirements.

Paper Details

Date Published: 1 January 1987
PDF: 15 pages
Proc. SPIE 0777, Optical Systems Contamination: Effects, Measurement, Control, (1 January 1987); doi: 10.1117/12.967082
Show Author Affiliations
Michael C. Fong, Lockheed Missiles & Space Company, Inc. (United States)
Milford A. Peterson, Lockheed Missiles & Space Company, Inc (United States)
Aleck L. Lee, Lockheed Missiles & Space Company, Inc. (United States)


Published in SPIE Proceedings Vol. 0777:
Optical Systems Contamination: Effects, Measurement, Control
A. Peter M. Glassford, Editor(s)

© SPIE. Terms of Use
Back to Top