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Proceedings Paper

Optical diagnostics for the arc jet facility at NASA/JSC
Author(s): Sivaram Arepalli
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Paper Abstract

The non-intrusive plasma diagnostics program incorporates various laser and other optical methods to measure the concentration, velocity, and temperatures of the different atomic, molecular and ionic species in test facilities that simulate atmospheric entry flows. The data collected in these measurements is used to validate arc jet flow codes that can be used in combination with shock layer codes to understand the heat transfer to the thermal protection materials. Absorption methods are used to estimate the atomic copper concentration in the free stream flow. Emission from the free stream and shock layer is used to identify the radiating species and also their rotational, vibrational and electronic temperatures. Analysis of the shock layer emission resulted in the temperature mapping across the entire shock layer. Laser excited fluorescence measurements are used to determine velocity and temperatures in the free stream as well as shock layer. This paper describes the current status and future development of optical diagnostics for the arc jet facility.

Paper Details

Date Published: 2 December 1993
PDF: 12 pages
Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); doi: 10.1117/12.163702
Show Author Affiliations
Sivaram Arepalli, Lockheed Engineering and Sciences Co. (United States)

Published in SPIE Proceedings Vol. 2005:
Optical Diagnostics in Fluid and Thermal Flow
Soyoung Stephen Cha; James D. Trolinger, Editor(s)

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