Abatement of gaseous and particulate contamination in a space instrument application to a solar telescope

Details Abatement of gaseous and particulate contamination in a space instrument application to a solar telescope Abatement of gaseous and particulate contamination in a space instrument application to a solar telescope

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983thph.conf....1s&link_type=abstract

Presented at the AIAA 18th Thermophys. Conf., Montreal, 1-3 Jun. 1983

Physics

Contamination, Diffusion, Outgassing, Purging, Telescopes, Thermodynamics, Flow Distribution, Flow Velocity, Gas Flow, Mass Transfer, Pressure Distribution, Space Flight, Space Shuttles, Time Dependence

Scientific paper

Methods to prevent the ingestion of external contaminants into the instrument and to limit the effect of the self-generated contaminants during ground, launch, orbiting and landing phases of flight were investigated. It is proposed that a positive pressure and purging flow of clean gas inside the instrument be maintained while on the ground, during launch, and for a period of time in orbit. The pressure to be maintained and the required purging flow are examined in terms of the effectiveness in preventing gaseous and particulate contaminants ingestion and the abatement of the self-generated contaminants. Considerations have been given to the venting requirements for the structural integrity of the instrument during launch, the limitations on the volume and the pressure of the purging gas to be carried along in orbit, and the required venting area is established based on the internal volume of the instrument, the allowable pressure differential, and the rate of external pressure change during launch.

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