Optical diagnostics for the arc jet facility at NASA/JSC

Sivaram Arepalli

doi:10.1117/12.163702

2 December 1993 Optical diagnostics for the arc jet facility at NASA/JSC

Sivaram Arepalli

Proceedings Volume 2005, Optical Diagnostics in Fluid and Thermal Flow; (1993) https://doi.org/10.1117/12.163702
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

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.

Citation Download Citation

Sivaram Arepalli "Optical diagnostics for the arc jet facility at NASA/JSC", Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); https://doi.org/10.1117/12.163702

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