Particulate infiltration into a simulated space telescope

De-Ling Liu; Kenneth T. Luey

doi:10.1117/12.792844

2 September 2008 Particulate infiltration into a simulated space telescope

De-Ling Liu, Kenneth T. Luey

Proceedings Volume 7069, Optical System Contamination: Effects, Measurements, and Control 2008; 706907 (2008) https://doi.org/10.1117/12.792844
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

Abstract

To understand the dynamics of airborne particulate intrusion into a space telescope, a mechanistic model based on mass balance was developed to predict the extent to which ambient particles penetrate through vent holes and enter the interiors after the purge is off. This work describes the mathematical modeling analysis, supplementing with results from laboratory measurements using a cylindrical chamber as a simulated space telescope. It was found that the characteristic time for airborne particles to reach a saturation level, after the purge is off, can be characterized by the air exchange rate and particle deposition rate inside the confined space volume. The air exchange rate, measured using a tracer gas technique, is associated with the natural convection and air flow turbulence intensity adjacent to the chamber. During the purge outage, the steady-state airborne particle concentration inside the space telescope is governed by the ambient particle concentration, air exchange rate, and particle deposition rate.

Citation Download Citation

De-Ling Liu and Kenneth T. Luey "Particulate infiltration into a simulated space telescope", Proc. SPIE 7069, Optical System Contamination: Effects, Measurements, and Control 2008, 706907 (2 September 2008); https://doi.org/10.1117/12.792844

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available